bluuebunny/crossref_metadata_2025 huggingface dataset:
Theoretical Analysis on Flexural Behavior of Concrete Members Reinforced by Steel-Basalt FRP Composite Bars
Authors: Xiao Tong Liang , Qiu Hong Xing
Published: July 2014

Steel-Basalt FRP Composite Bar (S-BFCB) is a new kind of substitute material for longitudinal reinforcement, with high elastic modulus, stable post-yield stiffness and excellent corrosive resistance. It is made up of steel wrapped by basalt FRP in longitudinal direction. Based on mechanical properties of S-BFCB and the plane cross-section assumption, the moment-curvature relationship and stiffness on flexural members at different stages have been analyzed and verified by experiment. Flexural member reinforced by S-BFCB can make full use of the strength of FRP. By the principle of equivalent bar stiffness, the results show that the curvature and stiffness are almost the same results at pre-yield stage. While after yield, flexural member reinforced by S-BFCB has stable secondary stiffness and high bearing capacity. With the increase of fiber, the ultimate bearing capacity is improved.
Research on Structural Damage Identification of Reticulated Shell Based on Change Rate of Modal Strain Energy and Wavelet Analysis
Authors: Wang Meng Hong , Ji Chen Meng , Luo Shan Shan
Published: July 2014

In order to research the damage identification of reticulated shell, the damage identification of reticulated shell was taken on though two-step identification method on the basis of the optimal placement of sensors. The measuring points can be determined according to the optimal placement of sensors, which can be analyzed by the wavelet toolbox of MATLAB, in which make the change rate of modal strain energy the damage index. Then the measuring points of second step can be found. The damage placement can be identified from the second step by the change rate of modal strain energy. The result shows that: the two-step method is feasible.
Experimental Research on the Latticed Intersected Cylindrical Shell Structure
Authors: Zhu Ming Liang , Huang Li , Li Chao
Published: July 2014

The Latticed Intersected Cylindrical Shell (LICS) is a new type of spatial structure. In order to investigate the mechanical properties of LICS, an octagonal structural model, valley style, was designed and constructed. The model experiment under full-span loading was carried out. By comparing the experimental results with theoretical analysis, the LICS is proved to exhibit well mechanical performance. Valley members get high stresses, especially the members near bearings. It is proved that internal forces transmit to the bearings through the valley members.
Mechanical Behavior Experimental Study on Lattice Wind Turbine Tower KT-Type Joints of Concrete-Filled Steel Tubular
Authors: Wen Yang , Qu Lin Lin , Zhang Bao Feng
Published: July 2014

The mechanical behavior of joints on lattice wind turbine tower of concrete-filled steel tubular(CFST) is very complex, the safety and reliability of joints is very important for the whole structure. To better understand the mechanical properties of the joints, we design a static loading test of 3 KT-type CFST joints. According to the test, we make analysis about the failure progress, equivalent stress of joint intersection and the relation of load-defomation. The results showed that due to the presence of concrete, the failure mode of CFST joints is web members failed. The failure characteristic of overlap joints is the instability of compression web member while the gap joints are the weld tear of tensile web member. With the increase of the overlap ratio, the distribution of the equivalent stress is more uniform. The high stress area is in the gap and the tower wall which between the crown point and saddle point in tensile side.
Preliminary Study on the Effect of Loading Rate on Bond Property between Corroded Concrete and Steel Bar
Authors: Xu Wei , Zhang Ying Zi , Liu Chang Juan
Published: July 2014

Effect of loading rate on bond property between corroded concrete and steel bar are studied. Simulation test and finite element are used to study the pull-out test of corroded reinforcement concrete members in present literature. Considering the corrosion of steel bar and concrete and their rate dependent characteristics, the bond property of corroded reinforcement and concrete under the different loading rate (10-4 s-1-10-2 s-1) are studied. It concluded that the bond property was improved when the rating rate form 10-4 s-1 to the static load; the bond property would decreased when the loading rate reached the fixed value (10-3s-1-10-2s-1), the members was failed under the smaller load.
Compressive Strength of Artificial Sand Recycled Concrete with Different Content of Stone Powder
Authors: Lan Wen Wu , Zhong Rong Fu , Lv Bo , Gan Jing Yan , Ying Jing Wei
Published: July 2014

This study examined the compressive behaviors of concrete with artificial sand that mixed with different content of stone powder (SP). Forty-five cubic specimens were prepared with two strength grades and five SP-content. Including 15 specimens (C35) of recycled coarse aggregate (RA) concrete with artificial sand (RCC35), 15 specimens (C45) of recycled coarse aggregate concrete with artificial sand (RCC45) and 15 specimens (C35) of natural aggregate concrete with artificial sand (NC35). The workability of concrete mixture and the compressive strength of the cubic specimens were tested. The results showed that the slump of concrete mixture decreased with the SP-content increased, and the coagulability and water retentivity of the concrete mixture were improved by using stone powder. The compressive strength of the concrete with artificial sand were increased by incorporating stone powder. The optimal SP-content of RCC35 and NC35 is 20%, while RCC45 is 10%.
Computing Method Based on Compound Boundary Conditions for Short Cable Force
Authors: Lei Bo , Lv Ying Zhao , Chen Rong Feng , Ren Wei
Published: July 2014

Against the current problem of large errors in the test result of short cable force, this paper, based on energy method principle, introduces the concept of simply-supported modal participation factor. On the premise of considering the impact of such factors as flexural rigidity and boundary conditions, etc. on cable force test, this paper corrects the existing prediction models for short cable force, to provide a computational formula based on compound boundary conditions for the short cable force. Field measured data is combined to compare the prediction accuracy of the existing formulas, to draw a conclusion that the error of short cable force is almost always greater than 5% when calculation is based on simple-supported boundary conditions, and the error of short cable force is always greater than 10% when calculation is based on consolidation boundary conditions, while the error of short cable force is always less than 5% when calculation is based on the compound boundary conditions presented in this paper.
Experimental Study on the Mechanical Behavior of Truncated Hip Structure
Authors: Yang Yan , Li Hu Yong , Wu Ya Ping
Published: July 2014

Based on the characteristics of organic glass, organic glass plate is adopted to establish the test model, and through the static stress and strain values of stress and strain test model, the theory is simulated by using ANSYS finite element software, at the same time, through the theoretical analysis and the method of combining the structure model test, the truncated hip structure, the mechanical properties of special section.
Numerical Simulation Analysis of Mechanical Properties of Square Steel Tubular High-Strength Concrete Inner Set CFRP Round Pipe Flexural Members under Reciprocating Loads
Authors: Ren De Bin , Li Shuang , Chang Si Meng , Pei Wei
Published: July 2014

Using Finite Element Method simulating respectively Square Steel Tubular High-strength concrete inner set CFRP round pipe beam and Ordinary Square Steel Tubular High-strength concrete beam. Comparative analysis of the effect of the Mechanical Properties of inner set CFRP round pipe to components ; Studying on the effect of Mechanical Properties of Square Steel Tubular High-strength concrete inner set CFRP round pipe under with different arrangement ratio of CFRP and strength grade of concrete. Based on calculation we can see under cyclic loading Square Steel Tubular High-strength concrete inner set CFRP round pipe beams have quite different failure characteristics with Ordinary beams, the curve of moment-curvature is plump, having good energy absorption capacity and seismic behavior;The arrangement ratio of CFRP and the strength grade of concrete have great influence to the seismic behavior; of Square Steel Tubular High-strength concrete inner set CFRP round pipe beams, with the increasing of the layer number of CFRP round pipe, the improving of concrete strength grade, seismic behavior;of the beams is significant strengthened. Showing that inner set CFRP round pipe can significantly increase seismic behavior of Square Steel Tubular High-strength concrete beams.
Progress in Study on Elastic-Plastic Time History Analysis of Tall Building
Authors: Wang Fan , Lan Xiao Yi , Liu Ding Ding
Published: July 2014

This paper summarizes both advantages and disadvantages of elastic-plastic static and dynamics analysis methods and points out that dynamics analysis is more applicable and accurate for high-rise building analysis, compared to elastic-plastic static analysis. Then, some key issues of elastic-plastic dynamics time history analysis are introduced, based on the understanding of the latest progress of it, including element models of beam, column and shear wall, constitutive laws of steel and concrete, algorithm and analysis software. The research results provide helpful referencesto the application and population of dynamics analysis of tall building.
Research and Engineering in the Design of Building Walls
Authors: Zhang Qiao , Zheng Nan
Published: July 2014

Modern building walls is no longer a decoration, a simple external maintenance of the structure, but more and more deeply into an organic part of the whole building and involved in the functional construction of the entire building. The impact on the safety and energy saving
performance of the whole building has come to a crucial point. A height of 237.7m core tube frame structure actually works in Qingdao cited as an example and the design of
high-performance curtain wall system is studied. Many considerations in choosing the design and
construction aspects of wall materials,design methods are described in watertight, airtight, wind pressure, the safety and reliability of modern curtain wall project.
Finite Element Analysis of the Experiment of PC Pipe Pile with Holes Carrying Capacity
Authors: Dai Zheng Xin , Zhang An , Mei Guo Xiong
Published: July 2014

To study the carrying capacity of precast concrete pipe pile (PC pipe pile)with holes, the ABAQUS finite element software is used to simulate the experiment of the PC pipe pile with holes carrying capacity from different holes arrayments.The results showed that the strength of the PC pipe pile decreased after the area of holes increased.With the same area of holes,the increase in diameter of holes caused the strength decreased. Guidance would be given for the permeable PC pipe pile by the paper.
Interaction Analysis of Infilled Frame Structures under Lateral Loads
Authors: Gu Song , Zheng Zhi , Chang Xiao Lei , Wang Zong Kai , Liao Zhou Ming , Liao Zhou Xian
Published: July 2014

Filler stiffness and confinement effect on the frame structure under horizontal loads, making the earthquake severely damaged in recent years with filler frame structure. Research shows that the actual stiffness frame structure with infill walls and internal force distribution and pure framework significantly different. In this paper, the equivalent model analysis bracing frame structure filler with actual stiffness, elasticity and structure from stage to stage of the internal forces shaping the distribution were analyzed. The results show that the stiffness of the contribution and the confinement effect filler by factors geometry, masonry materials, the impact of the framework is not the same, need to consider the specific analysis and structural design.
Methods for Determination of Residual Mortar Content Adhered to Recycled Aggregate
Authors: Jia Chen , Yan Jia Chuan , Hu Qiong , Zou Chao Ying , Chen Fa Xin
Published: July 2014

To study the methods for determination of residual mortar content adhered to recycled aggregate, this paper aims at three methods which are apparent density method, quench hot method and sulfate solution freezing-thawing method. These methods were compared by experiments and their basic principles were also respectively stated. The principles of the latter two methods are similar, which are to separate the residual mortar and aggregate by external factors. But the effects of the sulfate solution freezing-thawing method is better than that of quench hot method. Finally, the best method is chosen to provide some theoretical evidence and research methods in studies and uses of recycled concrete.
Resist the Wind Load of Jacking System in High Buildings
Authors: Wang Fan , Mo Sheng Hao , Luo Zhi Feng
Published: July 2014

When the crane can’t work for the altitude of the high buildings, we can consider about the jacking system. Jacking system include some steel truss, a steel platform, some steel columns and so on. The steel platform is nearly the area with the concrete core tube, it provides a place for workers to wrap the rebar, to pure the concrete. This article combine the real engineering, detailing introduce when the jacking system meet a big wind load, how does it morph, and compare the margin with the code in China.
Strength Degeneration of SRUHSC Column to RC Beam Joint Subjected to Reversal Cycle Load
Authors: Yan Chang Wang , Zhang Ju , Liu Shu Guang , Yang Yong
Published: July 2014

In order to investigate the strength degeneration of SRUHSC column to RC beam joint subjected to reversal cycle load, six interior joint specimens were designed basing on half-scale model of prototype joint used in high-rise buildings. A reversal cycle loading test was carried out and test parameters included various axial load ratio and volumetric stirrup ratio. Strength degeneration of SRUHSC column to RC beam joint was described. A discussion on relations between λj and applied axial load ratio or volumetric stirrup ratio was presented. It was found that strength of all the joints degenerated in every displacement and degenerated more quickly with the increment of displacement during the reversal cycle loading, and that the strength of all the joints degenerated fast with the increment of applied axial load ratio and slowly with the increment of volumetric stirrup ratio. The experimental results indicated that test parameters had obvious influence on the strength degeneration of SRUHSC column to RC beam joint subjected to reversal cycle load.
Study on the Analysis and Pre-Control Technology of Vertical Deformation in Construction Process of the Super High-Rise Steel-Concrete Composite Structure
Authors: Cai Shan Bing , Liu Jun Yan , Cao Han Qing
Published: July 2014

Puli central mall, with super high-rise steel-concrete composite structure, is one of the landmarks in the city of Jinan. During the construction process, the vertical deformation of the structure is crucial. This paper based on the finite element analysis software Ansys, uses the refined finite element method to numerically model the elastic, creep and shrinkage deformation during the construction process, in order to gain the vertical deformation and the difference of deformation between core and frame. The pre-control methods for reducing vertical deformation are proposed for design and construction based on the modeling results and the relevant theory, beneficial to guide the construction process for this project.
The Study on the Temperature Effect on Steel Reinforced Concrete Girder of Transfer Story in the Construction Process
Authors: Sun Yue Dong , Niu Ben
Published: July 2014

The construction of high-rise building transfer story concrete girder belongs to the mass concrete, due to the concrete hydration heat temperature is often beyond the limited temperature, so need to make temperature calculation and temperature control of transfer story concrete girder in the construction process. This paper taking a steel reinforced concrete girder of a high-rise building transfer story as an example, using finite difference method to calculate the change rule of concrete temperature field along with age, then using nonlinear analysis program ANSYS simulation the mechanical performance of transfer beam under the action of loads and temperature stress during the construction. Analysis and calculation results should provide technical support for the construction of the steel reinforced concrete girder of the transfer story. Analysis shows that, at intervals of 12 days two laminated pouring of concrete in the construction process, will meet the requirements of temperature control.
Application Research of In Situ Axial Compression Method on Brick Masonry
Authors: Xie Ru Qiang , Chen Jian Wei , Zhang Jie
Published: July 2014

The walls of some masonry structure engineering are tested with in-situ axial compression method. By the test data is showed that the compressive strength of the masonry between slots is met the requirements of the relevant building codes. The results can provide a reliable basis for the appraisal of engineering quality. But the test data are far bigger than the characteristic values of masonry strength. Because the shear stress on both sides of masonry between slots is ignored.
Calculation of Cross Beam in Continuous Box Girder Bridge Based on Modified Shear Method
Authors: Gong Ya Feng , Sun Xiao Bo , Wang Huan Li , Bi Hai Peng
Published: July 2014

The mechanical properties of cross beam in continuous box girder bridge can be obtained through analyzing the finite element model and measured data of bridge. A new simplified calculation method for cross beam is proposed in this paper, which is called modified shear method. Comparative analysis with traditional method is used to verify its feasibility and practicability.
Computational Method on Axial Tension of Secondary Loaded RC Members Strengthened with Carbon Fiber Reinforced Plastic Sheets
Authors: Liu De Qing , Ren Qing Xin , Yu Wan Qing
Published: July 2014

Base on the existing condition that the bearing capacity is insufficient of some aging reinforced concrete (RC) members with axial tension, the formula for calculating the tensile capacity of the RC members strengthened with externally bonded carbon fiber reinforced plastic (CFRP) sheets is deduced and experiments of 8 RC members are conducted to examine the influences of CFRP sheets on the cracking load and ultimate load of the RC members. The calculation formulas agree with the experimental data and give the reference to the practical projects. The study is instructive and useful in strengthening of RC members with externally bonded CFRP sheets under axial tension.
Frame - Shear Design of Shear Wall Structure
Authors: Wang Yong Wei , Li Hong Xia , Cheng Yang
Published: July 2014

Articles with engineering examples discussed in the frame - shear wall structure of how to lay out the structure can effectively enhance the seismic performance of validated reasonable set of structural shear wall seismic played a key role, and for the frame - shear wall structure summed up the points to improve the seismic performance measures and design methods.
Design of Fastening Tube High-Formwork Supporting System
Authors: Sun Wu , Song Sheng Zhi , An Qin Li , Chen Fei Min , Mao Yan Hong
Published: July 2014

The fastening tube high-formwork supporting system of a hotel in SuZhou was taken as an example to investigate the key problems of stability, strength and stiffness existing in fastening tube high-formwork supporting system design. Through design calculation and construction measure, the safety of fastening tube high-formwork supporting system is guaranteed, and to provide the engineering reference for fastening tube high-formwork supporting system.
In-Plane Stability Bearing Capacity of Variable Section Column
Authors: Chen Ming , Ma Xiao Fei
Published: July 2014

Variable section portal frame is increasingly concerned and is widely used for its economy, beauty and short construction period, compared with other traditional structures. In-plane stability response of variable section columns of portal frames is the focus of this paper. Results are presented for parameters influence of variable section column on the in-plane stability bearing capacity with finite element analysis. References are proposed for practical application compared with computational formulas of Technical Specification for Steel Structure of Light-Weight Buildings with Gabled Frames.
A Kind of Swinging Bumper in the Rear of a Truck and its Performance Research
Authors: Xie Jin Fa , Cheng Yan Qiang
Published: July 2014

Using three-dimensional modeling software to design a kind of swinging rear underrun protective device, using the Ansys finite element analysis software, in accordance with the provisions of GB11567.2-2001, the rear underrun protective device applied static load analysis. The results show that the protective device and the body in the welding and bolt connecting two different cases, connected by bolts can effectively avoid the connection of stress concentration, and support as the main part of the force. But by welding, the connections exist obvious stress concentration, may to cause the protective frame dropping.
Multi-Objective Optimization of Composite Elliptical Submersible Pressure Hull for Minimize the Buoyancy Factor and Maximize Buckling Load Capacity
Authors: Elsayed Fathallah , Qi Hui , Tong Li Li , Helal Mahmoud
Published: July 2014

Due to the wide range of variables involved and sophisticated analysis techniques required, optimum structural design of composite submersible pressure hull is known to be a challenge for designers. The major challenge involved in the coupled design problem is to handle multiple conflicting objectives. The problem with its proper consideration through multi-objective optimization is studied in this paper. Minimize the buoyancy factor and maximize buckling load capacity of the submersible pressure hull under hydrostatic pressure is considered as the objective function to reach the operating depth equal to 6000m. Finite element analysis of composite elliptical submersible pressure hull is performed using ANSYS parametric design language (APDL). The constraints based on the failure strength of the hulls are considered. The fiber orientation angles and the thickness in each layer, the radii of the ellipse, the ring beams and the stringers dimensions are taken as design variables. Additionally, a sensitivity analysis is performed to study the influence of the design variables up on objectives and constraints functions. Results of this study provide a valuable reference for designers of composite underwater vehicles.
Prestressed I-Beams Made of Ultra-High Performance Concrete for Construction of Railway Bridges
Authors: Tej Petr , Kolisko Jiří , Bouška Petr , Vokáč Miroslav , Čech Jindřich
Published: July 2014

This paper focuses on research into prestressed I-beams made of ultra-high-performance concrete, which are designed to be structural elements in small and medium span railway bridges. Prestressed concrete I-beams are designed with ten prestressing cables in the bottom flange. The prestressed beams are laid close together in the actual structure with panels inserted between them. The entire structure will subsequently become monolithic. At the present time, I-beams made of rolled steel are commonly used as structural elements in this type of structure. The advantage of these types of structures lies in their having a low construction height. This paper presents a computer and experimental analysis of the loading of UHPC prestressed I-beams. For the purpose of the experiments, several specimens of 7 m span were made. The specimens were subsequently tested in the laboratory in four-point bending tests. The paper presents the process and results of the experiments. Simultaneously with the experiments, computer analyses were created in which optimization of the material and geometric parameters of the beams were carried out. The paper demonstrates the correspondence of the experimental and computer-simulated load test results.
Simulation Research for Bar-Type Composite Wall under Certain Bias Loads
Authors: Li Cong Bo , Zhan Zhen Feng
Published: July 2014

It adopts the finite element analysis method, researches the stress state of the composite wall interface of bar-type composite wall structure just under the certain bias loads. The Bar-type composite wall structure under bias load, then the stress distribution rule of the windward side and leeward surface is near with the thermal insulation layer. On the wall, the stress is larger of the upper and below part of wall, the middle part of the interface tangential stresses are zero; the upper end wall supports the maximum interfacial normal stress.
A Refined Theory of Moderately Thick Plates According to Exposition of the Classical Technical Theories, Theoretical Aspects
Authors: Martinez Valle Jose Miguel
Published: July 2014

In this paper we propose a new refined shear deformation plate theory. This theory possesses a series of desirable features, the most salient of which areas follows: (i) The loads, which are usually considered to be applied on the middle surface of the plate, are applied in this new theory on the top surface of the plate; (ii) The equations deduced provide the same order of accuracy as several theories with second order shear deformation effects; (iii) It constitutes a theory, in the sense defined by Love, since it gives easy expressions for application to problems in different fields in architecture and engineering.
Multiple Cross-Laminated Container Floor Temperature Field Based on ANSYS
Authors: Zhao Kao Zhong , Liu Jian Jiang
Published: July 2014

Concrete composite beam floor cage floor as a new form , with a saving of steel and concrete , lighter weight, the advantages of high capacity , and has been more widely used in engineering. Therefore , to carry out the new concrete composite beam floor cages fire behavior for large spaces , large span areas is necessary. This article is the use of finite element software ANSYS multi-span composite floor beams cages fire tests to simulate life and death through SOLID70 unit features analog composite bottom plate before and after bursting floor temperature field and gives composite floor box overall temperature distribution along the rib cloud cover and the temperature of the beam cross-section of different heights - time curve , finally, the simulation results and experimental conditions were compared and analyzed , the main draw the following conclusions : the use of ANSYS thermal unit SOLID70 cell function and death can be simulated temperature distribution in case of fire concrete composite floor beam floor cages before and after bursting through the ribbed section of different heights temperature - time curve can be seen, the test results agree well with the simulation results ; testing process with increasing temperature , floor surface inlets, stacked boxes floor temperature contours directly reflects the law during the test floor surface appears inlets .
Optimal Design Analysis of Composite Submersible Pressure Hull
Authors: Elsayed Fathallah , Qi Hui , Tong Li Li , Helal Mahmoud
Published: July 2014

Recently, submersible pressure hulls with fiber-reinforced multilayer constructions have been developed as substitutes for classical metallic ring-stiffened pressure hulls. The strength and stability is its top priority. In this paper, the optimum design of elliptical composite deep-submerged pressure hull under hydrostatic pressure is investigated based on the finite element analysis to minimize the buoyancy factor of the submersible pressure hull according to the design requirements. Minimize the buoyancy factor of a submarine pressure hull under hydrostatic pressure is proposed as an objective function and the constraints based on the failure strength and the buckling strength of the hulls are considered. The thickness and the fiber orientation angles in each layer, the radii of the ellipse, the stringers dimensions and the operating depth are taken as design variables. Additionally, a sensitivity analysis is performed to study the influence of the design variables up on the Tsai-Wu failure. Results of this study provide a valuable reference for designers of composite underwater vehicles.
Thermal Responses of a Thin Plate under Periodic Heat Flux Oscillation
Authors: Li Qiang Nian
Published: July 2014

Thermal behaviors of a thin plate under a periodic surface thermal disturbance are investigated. The temperature and the displacement responses are predicted using the parabolic heat conduction model. The solution of temperature response is obtained by separation of variables. Firstly, an analytic expression of heat flux filed within the plate is obtained by using the parabolic heat conduction equation which is described by heat flux vector, then, based on the conservation equation of energy, the temperature response is given. The displacement response of the plate is solved analytically using the Nowachi’s and the Navier’s approachs. The thermal behaviors of a plate with various relatively parameters is calculated numerically and the results shown graphically.
Parametric Modeling and Stability Analysis of Temporary Grandstand
Authors: He Lin , Liu Cong , Wu Zhen Yu
Published: July 2014

Temporary grandstands bear crowd load, which is created when spectators jumping on the structure. The simplified loads applied to temporary grandstand have been obtained based on experiment data of human body jumping forces. By the ABAQUS software, the parametric and automatic modeling of three-dimensional (3D) temporary grandstand structures has been realized with Python scripting. The linear buckling analysis and nonlinear buckling analysis of the structure have been carried out. The ultimate bearing capacity and the structural deformation under crowd load have been acquired. Results show that the nonlinear effect of the structure under crowd load is very obvious; the linear buckling analysis cannot get the ultimate bearing capacity of the structure and the first order buckling mode cannot simulate the final deformation of the structure either. The research of this paper greatly improve the efficiency of the construction and automation design of temporary structures and reveal the mechanical behavior of such structure to a certain degree.
Study on the Static Performance of Sand Washing Tower Based on ANSYS
Authors: Lv Jiang Hua , Shi Jia Peng , Zhu Wei Hua , Zhu Feng , Yan Chang
Published: July 2014

In this paper, using the finite element method,check for the Ken Swart project sand flushing water all operating tower in static stability. First of all, select unit and a calculation model, establish the finite element model; Then analys the displacement distribution and stress distribution of the structure in the five conditions.
Numerical Modeling Research of Rectangle Pipe-Jacking Construction
Authors: Bao Xian Kai , Liang Li Juan
Published: July 2014

Combined with the city of Baotou Arden Street underground passage pipe jacking engineering, using three-dimensional finite element software ANSYS to simulate the process of rectangular pipe jacking construction, this paper will emphasis on the influence of soil displacement around the construction site of the rectangular pipe jacking construction under dynamic loads. Through research, it got the rectangular pipe jacking construction sphere of influence of soil disturbance, and the variation in both horizontal and vertical direction, and compared with the measured data, proved that the numerical simulation has important guiding significance to the pipe jacking construction, will provide a reference for the future construction of similar projects.
Numerical Analysis and Calculation of Internal Forces of Steel Box Continuous Girder Bridge Construction Process
Authors: Liu Ting , Su Qian , Zhang Wen Chao , Bai Hao
Published: July 2014

In order to determine the most unfavorable condition of the steel box girder, ensure its stress and deformation in the safe state, the steel box girder bridge should apply the finite element analysis software to modeling analysis. At the same time, data calculation can provide the theoretical evidence for the factory manufacturing lines. The tender DB01 of the continuous bridge of the Hong Kong-Zhuhai-Macao Bridge provides the backdrop for this essay, using MIDAS/Civil 2012 to do numeral simulation analysis on the hoisting, and then analyzing the stress and deformation of the main beam at the different construction stages. The analysis reveals that the temporary maximum of a hinged steel box girder should be 47.5MPa in the process of construction which is allowed by the stress of the steel Q 345.And after the No.1 beam has been put in the right place and connected, the maximum displacement of the No.6 joint is 19.4mm downward. With the construction stage CS7 completed, the maximum downward displacement is 14.2mm. Making the stress free alignment is superposing the minus figure of the cumulative displacement on the basis of designed line. Each beam segment has been made according to the stress free alignment .Also, after field construction, the ideology of designed lines of the bridge will be brought into reality.
Cracking Simulative Analysis of Reinforced Concrete Columns with ANSYS Software
Authors: Zhang Guo Jun , Jia Yong Bin , Lu Xi Lin
Published: July 2014

The principle and processof finite element model of ANSYS software for RC frame column was introduced firstly,and then the cracking and development rules of RC columns under monotonic load were analyzed with ANSYSsoftware. The results show that: with the stirrup ratios increasing, the short columnwith rectangle hoop, rectangle cross brace hoop and tic tac toe stirrups appearsuccessively few inclined cracks and more vertical cracks; with the axialcompression ratio increasing, more length of horizontal cracks extend to naturalaxis, more vertical cracks appear and appeared cracks are higher along thecolumn height direction for middle length HSC frame columns; the length of OSCframe columns is not so long than that of HSC frame columns, and the crack distributionis dense and crack forms mesh, which show better ductility.
Space Stability Analysis of Inclined Thin-Walled Steel Box Ribs
Authors: Ma Hua Jun , Chen Xin Chong
Published: July 2014

Main bridge of Nanning Bridge is taken as Research Object. Using the finite element program ANSYS, space finite element model of an arch bridge with two inclined thin-walled steel box ribs is build, stability safety factor of the bridge is calculated, eigenvalue buckling analysis and non-linear buckling analysis of inclined thin-walled ribs are carried out, and stability performance is discussed. The result shows that stability problems of this bridge mainly occur on the ribs and are out-of-plane buckling in general, and horizontal loads have greater influences on out-of-plane buckling. The calculation results can provide parameters for construction, health detection and maintenance in the operational phase of the bridge.
About Test Methods of Corrosion State of Reinforced Concrete Structures
Authors: Ulybin Aleksey V. , Puzanov Alexander V.
Published: July 2014

The article describes the traditional methods used in Russia for testing of reinforcement corrosion conditions including peculiarities and weak sides of it. The new methods of non-destructive testing, which are used mainly in foreign countries, are overviewed there. The physical basics and the advantages of the testing method of half-cell potential are also characterized. A relatively new method of non-destructive testing of reinforcement corrosion condition is the method of measuring the concrete resistivity. The article describes the principal of its application and the factors influencing the measuring result. There are also the data of this method application for covering inspection of the Kurskiy station in Moscow.
Autoexcitation-Based Accelerometer Array for Interface Separation Detection of Concrete-Filled Steel Tubular Arch Bridge
Authors: Pan Sheng Shan , Zhao Xue Feng , Zhang Zhe
Published: July 2014

The separation between the filled-concrete and the steel tube would reduce tremendously the bearing capacity of the concrete-filled steel tubular (CFST) arch bridge. However, there is no efficient method to monitor and detect the separation so far, which is a great engineering problem we have to solve. Therefore, this paper firstly proposes a vibration test method aiming at the local modal of the steel tube. Distributed accelerometer array deployed along the tube is used to acquire the vibration signal induced by quantitative excitation via telecontrol. Changes in frequency and amplitude of the steel tube are selected as parameters for the separation detection based on the theory of surface wave transmission. This method can satisfy the demand of the real-time monitoring of interface separation of the CFST arch bridge.
Numerical Simulation of Effect of Foundation Pit Excavation on Underlain Shield Tunnel
Authors: Wei Gang , Hu Ling Wei , Chen Kai Lei
Published: July 2014

In the background of a foundation pit excavation project on Yanan Road in Hangzhou City, this study simulated the excavation of foundation pit above an underground tunnel using 3D MIDAS/GTS software. The combined action of foundation pit, ground and tunnel were considered. The influence of foundation pit excavation on the deformation of underlain shield tunnel was evaluated and simulations were carried out on the effectiveness of different strengthening and control approaches. Results from the research showed that during the stages of piling and ground strengthening, settlement occurred at the tunnel; with the excavation of foundation pit, uplift deformation at the bottom of the foundation pit and the tunnel increased; with stricter strengthening and control techniques employed, the magnitude of uplift at the tunnel and bottom of the foundation pit reduced, suggesting that various control procedures were effective to some extent.
On Karst Water Inrush (Gushing) Geological Environment in Pingyang Tunnel
Authors: Zhu Qing Qing , Miao Qiang Qiang , Jiang Shu Ping
Published: July 2014

According to Pingyang tunnel karst complex groundwater environment ,This paper carried out thorough theoretical analysis and field observation from Pingyang tunnel stratum rock properties, engineering geology, hydrogeology, the surrounding patch, runoff and drainage and the changes of surface water environment, as well as tunnel excavating. The complex formation mechanism has given in the Pingyang tunnel karst water . Some effective references had put forward for the engineering treatment, provided some valuable references for other similar underground engineering construction.
Research on the Regional Stress Field of Underground Powerhouse at the Right Bank of Baihetan Hydropower Station
Authors: Zhao Qing , Leng Xian Lun , He Xiang
Published: July 2014

According to the analysis results about the distribution rules of tectonic regional stress in China mainland, the distribution rules of tectonic regional stress in Chuandian and the tectonic movement of Baihetan , the distribution rules of regional stress in Baihetan were preliminary analysed. Based on measured results of geostress and the statistical analysis of the measured results about the geostress of the shallow crustal magmatic in China mainland,the distribution rules of regional stress in underground powerhouse at the right bank of Baihetan hydropower station were studied. In general,the maximum and the minimum horizontal principal stresses and the vertical stresses increase linear with depth . In dam abutment.while in the underground powerhouse.Based on the measured results of geostress,the dispersed point charts of the ratio among the maximum horizontal stress ,the minimum horizontal stress and the vertical stress with depth in China were established, using the method from the statistical analysis of measured results about the shallow crustal geostress in China mainland and the corresponding regression analysis was studied.
Design of High Speed Railway Tunnel and its Construction Method in Abrupt Slope with Loose Rockmass
Authors: Zhou Xiao Jun , Jiang Bo , Yang Rui , Ning Chao
Published: July 2014

This paper mainly deals with the structural design of high speed railway tunnel and its driving method in abrupt slope with loose rockmass, meanwhile summarizes the connection between tunnel portal and bridge abutment in loose rockmass according to complicated landform and geology. The anti-slide piles are adopted to retain the stability of abrupt slope near the tunnel portal. In order to eliminate the risk and cost in tunnel construction, four bench cut method is invented to satisfy the safe excavation of loose rockmass in the tunnel. Composite fiber rockbolt is also employed to keep the stability of working face while driving the tunnel. The innovative tunneling method presented in the paper can be applied to guide the rational design and economical construction of high speed railway tunnels in loose surrounding rock under harsh geological conditions.
Study on FEM Numerical Simulation and Strain Monitoring of Tunnel Secondary Lining
Authors: Li Ying Na , Liu Meng , Wu Sheng , Liu Hao , Su Jian Kun , Zhang Zhi Lin , Li Chuan
Published: July 2014

Safety of secondary lining is of utmost importance to tunnel engineering quality as the main load-bearing structure and the last waterproof line of rock tunnel under type III. The comparative study of strain state results from FEM numerical simulation and on-site monitoring in Yunnan Tianxin Tunnel was conducted to obtain the stress regularity of tunnel lining. The results showed that except vault, the strain states of secondary lining obtained by numerical simulation and on-site monitoring were consistent. The strain value of on-site monitoring was approximately 60%~70% to the simulation value. And the strain value of right side was greater than the value of the corresponding location on the left side. It’s noticed that high strain were found in tunnel haunch and arch springing. Great attention should be paid to arch springing for the largest strain value. The strain monitoring value of vault (309.83με~327.23με) has been detected larger than simulation value (209.37με), which matches well the crack phenomenon of vault. Therefore it’s significant to focus on the long-term monitoring of vault. The defects of single on-site monitoring method such as poor predictability were made up effectively by comparative study. The results achieved can be recommended for similar projects.
Model Tests of Foundation Bearing Capacity of Sandy Soil and Pile Foundation Bearing Capacity
Authors: Lu Shi Jie , Chen Hua Dong , Chen Wei , Xiang Tong , Hong Xie Feng
Published: July 2014

Using self―made model device, researchers studied the characteristics of foundation settlement of sandy soil and pile foundation load―bearing in sandy soil. Through weight loading, researchers analyzed the phenomenon of foundation settlement. Then, researchers embedded friction piles in sand, so as to analyzed pile foundation bearing capacity. The methods and results of the research can provide guidance for teaching of Soil mechanics and foundation engineering.
Research on early Concrete Crack Control of Shijiazhuang Subway Construction in Winter
Authors: Yu Xiang Mei , Cao Li Jun , Geng Dong Yang
Published: July 2014

The control of concrete cracking is a complicated and difficult problem for civil engineering. It is more difficult to control the cracking of the concrete poured in the winter. Thorough the analysis of the construction of the Shijiazhuang subway in winter, several methods are integrally applied. Frost proof and decreasing the temperature stress of concrete is considered together. The construction quality of the concrete arrive a satisfied level and the cracking of the concrete is successfully handled.
Response of the Spiral Conveyor Spewing in Water-Rich Sand
Authors: Song Yi Rong , He Jia , Chen Guang Feng , Hong Min , Li Peng Bo
Published: July 2014

Spiral conveyor spewing is a serious danger when the shield tunneling machine crosses water-rich sand stratum. It will lead to the malfunction of dregs discharging and the failure of soil pressure’s effective control. It will be a chief reason to influence construction progress and even cause secondary disaster, which led to the serious destroy of the survival environment, such as ground collapse, water leakage in the tunnel. The danger of spiral conveyor spewing and the countermeasures and the method of the project can be stated by the construction experience in some sections, in order to give some suggestion and references to similar engineering.
Study on Classification and Regulation for Defects on Railway Tunnel
Authors: Zhang Jing Wei , Wang Shuai , Huang Hui Xuan
Published: July 2014

Quality defects and diseases will happen to railway tunnel after it in operation four to five years later, such as lining split, water leakage and landslide of second lining. Based on the case of Goujiagou tunnel located at Ⅳ surrounding rock with mudstone and sandstone, the regulation for this tunnel is put forward; the causes and characteristics of all kinds of defects are analyzed by studying on the particularity of railway tunnel construction. Based on different extend of injury, the classification of the same type defect is proposed. Research results indicate that the regulation design is feasible and the treating technique is appropriate by using new technology, methods and materials. The results will provide reference to design for the same type tunnel regulation.
Development States and Existing Problems Research of Nondestructive Testing of Bolt
Authors: Bao Xian Kai , Liu Huan Huan , Liang Li Juan
Published: July 2014

As the primary technique to offer safety and productivity improvement s for under- ground project s , rock bolt s have been widely used in t he construction of t raffic and hydro- power stations. The quality of the rock bolt s is of great importance and has been paid a lot of at tention to. This paper reviewed the history of some techniques used for the inspection of rock bolt s and analyzed their t heory and application. It point sout that the t heoretic p roblem is t he primary problem existed in t hese techniques.Nondestructive testing of bolt develops quickly with plenteous accomplishments and experiences.And we state these accomplishments mainly and look into the future.
Kinematics Analysis of Working Edge Point for Gauge Disc Cutter in Cutterhead of Tunneling Machine
Authors: Wu Qi Xing , Tian Guan Feng , Chen Lin , Ma Hong Wei
Published: July 2014

Based on the analysis of movement characteristics of gauge disc cutter in cutterhead of tunneling machine, the motion equation to describe the working behavior of the edge point of gauge disc cutter in tunneling process is deduced by using the method of space coordinate transformation matrix. The motion equation has the advantages of considering more parameters, such as position variables of disc cutter, cutter radius, cutterhead rotating speed and advance speed.
Mechanism Analysis and Prevention Method for Tunnel Fire
Authors: Wu Jing , Shen Fei Ming , Jiang Ping
Published: July 2014

By analyzing the typical fire cases and tunnel fire statistics during 2008 to 2013 in Fujian province of China, results shows that the main causes for the fire were vehicle accidents and spontaneous combustion. By the investigation, there are three approaches to prevent the tunnel fire exposed to different combustibles. For flammable solid, an effective method to prevent fires is to decrease the maximum environment temperature and the product concentration. For flammable liquid, adjusting the ambient temperature and enhancing ventilation can prevent or reduce the fire accidents. For flammable gas, the effective method to prevent the fire is to decrease the fuel density and the ambient temperature. So, for long tunnels or busy tunnels, it must strengthen the management of the vehicles. Moreover, in the hot season and rush hour it should control the ambient temperature inside the tunnels.