bluuebunny/crossref_metadata_2025 huggingface dataset:
Aseismic Constitution Problems and Strengthening Methods of Chinese Ancient Wooden Buildings
Authors: Zhou Qian , Yan Wei Ming , Ji Jin Bao
Published: August 2013

Chinese ancient wooden buildings have good aseismic constitutions to survive sorts of natural disasters. However, under earthquakes damages still occur on some of them. To protect Chinese ancient wooden buildings, typical aseismic constitution problems as well as strengthening methods of their members were studied by classification and statistical methods. Based on survey results on large number of Chinese ancient wooden buildings, typical aseismic constitution problems were summed up, causes for the problems were analyzed and the corresponding strengthening methods were proposed. By 2 compared examples, typical strengthening methods were further demonstrated. Results show that typical aseismic constitution problems of Chinese ancient wooden buildings include decay of column root, slack of Tou-Kung, tenon pulled out of mortise, cracks of beam and column and so on; to solve these problems, methods such as replacement, wrap, connection, ensemble and so on are feasible.
Erosion-Resisting Characteristics of Concrete under Freeze-Thaw Action
Authors: Wang Bei , Li Fu Hai , Li Jian Li , Cui Sheng Ai , Zhang Yong Wang
Published: August 2013

Erosion-resisting characteristics of C25C35 and C50 concrete are tested in an environment of freezing and thawing cycle. The result shows that the corrosion becomes more and more serious under clear water, the liquor of sodium sulfate, the liquor of sodium sulfate and sodium chloride after 300 freeze-thaw cycles. This kind of phenomenon also happens when the water cement ratio becomes increasingly bigger. The concrete samples which are protected by SPUA (Spray Polyurea Elastomer) are in good condition. The main problem is spalling from surface to interior, which shows different tendency in different salting liquid.
In-Plane Creep Stability Design of Concrete Filled Steel Tubular Arches Using Inverse Reliability Method
Authors: Jiang Wei , Lu Da Gang
Published: August 2013

An inverse first order reliability method (FORM) is presented to solve the safety factors for the in-plane creep stability of concrete filled steel tubular (CFST) arches. In the inverse analysis, the safety factors with or without considering the time-dependent behavior of concrete are introduced into limit state equations for the in-plane stability design of CFST arches. For different target reliability indices and steel ratios, the time-independent and time-dependent safety factors are solved. The results show that the inverse FORM is of good efficiency and applicability. The target reliability indices have little effect on the safety factors for the creep stability of CFST arches. The effects of steel ratios are significant which should be considered in design. For the commonly used steel ratios of CFST arches, the in-plane safety factors for creep stability range from 1.17 to 1.43.
Experimental Study on Strain Performance of Tensile Reinforcement under Fatigue Loads
Authors: Tang Xian Xi , Liang Jin Bao , Zhu Yan Peng , Tang Xian Zhou , Xu Yue
Published: August 2013

As for the study on the strain performance of tensile reinforcement under the fatigue loads with amplitude of certain values, two groups of reinforced concrete slab bridge specimen were made. The fatigue test was carried out on one group of specimen, and the corresponding static load test was carried out on another group of specimen, the experimental study on the strain performance of tensile reinforcement was carried on bottom of the mid span of slabs. The results of the study shown that, under the fatigue loads at a certain amplitude, the strain performance of the tensile reinforcement tend to be stable with the increase of number of fatigue cycle, the strain value showed certain linear relationship with static load applied. When the fatigue amplitude increased, the change rule of strain with static load value applied was approximately linear, but the strain value increased more than the fatigue amplitude less under the same static load. It could be seen through the comparison of load - strain curve of the static load specimen, after effect of compressive fatigue with certain amplitude, the strain change with load applied was close to linear change, which has great relationship with the effect on concrete and reinforcement plastic deformation by fatigue load. The test results had the vital significance of further research on reinforcement performance under the action of fatigue loads.
Study on Box-Jenkins Method of Prediction of Chloride Concentration of Marine Concrete Structures
Authors: Li Er Ju , Zhou Xin Gang
Published: August 2013

The paper introduces life prediction models and existing questions of marine concrete structures exposed to chloride environment; Theory of Box-Jenkins time series prediction method is put forward to analyze the change law of chloride concentration of reinforcemnet surface of marine concrete structures along with time; Stationary test, model identification and parameter estimate are introduced; Modeling process and best model identification are discussed by means of analyzing laws of chloride concentration changing with time, and predicts using the best model. Analysis results show that the prediction model built by Box-Jenkins method has simple form and high prediction accuracy. Whats more, future chloride concentration can be well predicted by history values without determining specific values of durability parameters.This is a new method of life prediction of marine concrete structures.
Resaerch on Bending Behavior of Corroded PC Beams
Authors: Zeng Yan Hong
Published: August 2013

Nine post-tensioned concrete (PC) beams were made and corroded by impressing direct current to them. The influences of different factors, such as the corrosion ratio of prestressing tendons, grouting condition etc., were taken into consideration. The failure modes and mechanism of corroded PC beams were investigated by monotonic loading tests. The experimental results showed that the higher the corrosion ratio of prestressing tendons is the lower the cracking, yielding and ultimate capacities of the PC beams will be. With the development of the corrosion of prestressing tendons, the characteristics of load-deflection curves of PC beams are no longer similar with that of uncorroded PC beams, but turn into that of reinforced concrete beams. The prestressing tendons will be easier to corrode for a beam with bad grouting condition, and the corrosion will lead to severe deterioration of the bond strength between concrete and prestressing tendons that will greatly reduce the stiffness of the beam.
Cause Analysis and Countermeasures of Early-Age Cracks on Cast-in-Place Slab with Ready Mixed Concrete
Authors: Ke Cai Tong , Chen Yi Bai , Gao Hong Bo , Cao Xiong
Published: August 2013

Early-age cracks on cast-in-place slab with ready mixed concrete is a widespread problem,which is also difficult to solve.A cracking instance of cast-in-place concrete slab is introduced. The causes of the cracks are presented from two aspects of theoretical and calculation analysis after the field detection, and the corresponding treatment scheme is proposed.Meanwhile, the corresponding precautions for early-age cracks on cast-in-place slab are suggested on three aspects:concrete material,construction and design. And the good effect has obtained in the subsequent construction.
Effect of Curing Temperature on the Properties of Concrete at Early Age
Authors: Zhu Peng , Zhou Xin Gang
Published: August 2013

Under the consideration of radiation, convection, and evaporative cooling, simulating the effect of different curing temperatures (5°C,10°C,15°C,20°C,25°C,30°C) on the performance of concrete at early age. The results showed that curing temperature affected the early age performance of concrete greatly. Higher curing temperature improves the peak temperature of concrete members, and contributes to the development of the strength of concrete at early age, but elevated curing temperature will lead to higher cracking potential classification of concrete at early age.
The Research of Predicting the Carbonation Depth of Concrete with Time-Series Analysis
Authors: Li Gui Zhou , Zhou Xin Gang
Published: August 2013

This paper analysis and reviews the calculation and the predicting model of concrete carbonation depth, also discusses the influence factors of concrete carbonization and the applicability of the predicting model. In order to reduce or avoid the effect of complex factors such as material composition, humidity and temperature on the calculation of the carbonation depth and the prediction results, the predicting model of concrete carbonation depth based on the time-series changes is investigated. In this model, Box-Jenkins time series analysis is utilized to establish the regression model-AR model, which reflect the concrete carbonation depth changes over time. The research and analysis shows that the model has characteristics of simple and high precision, and with the measured data increased and updated, the prediction result is getting better and better. Using this method to evaluate the life of concrete structures which under the affection of carbonation, only need to test the carbonation depth of concrete, and the other parameters is not need consider.
Comparison of Two Approaches in Reliability Analysis for the Network of Trentinos Bridge Management System
Authors: Yue Yan Chao , Ma Jian Xun , Gao Jian , Zonta Daniele , Pozzi Matteo
Published: August 2013

The connectivity reliability of a network states the probability that the traffic can reach the destination from the origin. This paper is dedicated to find a reasonable and fast method to calculate connectivity reliability between any two nodes of a network. Monte Carlo simulation and ORDER algorithm are used and compared in getting the network connectivity reliability. The results show that ORDER algorithm can give more accurate bounds of connectivity reliability for network with high reliable components, while the computation time of Monte Carlo simulation is shorter than ORDER algorithm. Both approaches are applied to the network in the Bridge Management System in the Autonomous Province of Trento.
Analysis of Glass Elements Fasted into the Steel Frame
Authors: Rykalová Eva
Published: August 2013

Glass as a building material is quite used nowadays. In the Czech Republic, the glass is still considered only as a filler material; therefore assessment of them in terms of statics is difficult. This paper deals with the issue of designing of sheet of glass of railing in the Czech Republic. This article describes the process of bending tests of multilayer glass of comparable thicknesses and analyzes its behavior in terms of safety and maximum load.
Theory Analysis on Buckling of a Square Steel Tube Member Strengthened by CFRP with the Initial Imperfection
Authors: Jin Chun Fu , Niu Peng , Zhao Yong Sheng
Published: August 2013

Based on Ježek method of computing the elastic-plastic buckling of the member under the axial compressive load and the bending moment, considering the initial geometric imperfection, the analytical expressions of calculating the ultimate load of buckling about the neutral axis with the maximum moment of inertia for a square steel tube member with flange outsides wrapped by carbon fibre are derived. Using the elastic-plastic finite element method and the theory of nonlinear buckling, the impact of the initial geometric imperfection on the square steel tube steel member wrapped by carbon fibre under the axial compressive load and the bending moment are analyzed and the numerical solutions of ultimate bearing capacity are obtained. By compared with the values of the finite element method (FEM), it shows that the analytical method in this paper is valid. Compared the reinforced effect of the carbon fibrer to the perfection member with the defect member, we find that the former is higher than the latter. The results of the example also show that the presence of initial geometric imperfection reduces the ultimate bearing capacity of the steel member to a great extent. The influence of defect member gradually decreases when the given moment rises.
Buckling Analysis of Stiffened Plate with Local Imperfections under In-Plane Bending
Authors: Chen Qi Feng , Liu Mu Yu
Published: August 2013

Elastic buckling of stiffened plate with local imperfections were presented in this paper. As its difficult to analysis buckling character of the stiffened plate with local imperfections by using elastic plate theory, this paper used finite element method (FEM) to model 30 different cases of local imperfections in stiffened plate, and analysed how the size, depth and direction of local imperfections affect the critical buckling coefficient of the stiffened plate. Results shown that, the size, depth and direction of local imperfections are have significant impact to the buckling behavior of stiffened plate, the largest decrease of critical buckling coefficient due to the local imperfection reaches 30% in this paper, and the critical buckling coefficient of stiffened plate with smaller stiffness ratio is more susceptible to the local imperfections.
Mechanics Analysis and Construction Method of Prestressed Concrete Pipe
Authors: Wu Wei , Ji Jing
Published: August 2013

Simulation analysis on prestressed concrete pipe was carried out by using finite element software ANSYS. The internal and external pressure which the pipeline is subject to is simulated in real work process, and deformation and stress distribution of building pipeline structure are got. We have great understanding in the mechanical properties, at the same time give a detailed introduction for the prefabrication and on-site construction process. Three aspects in this paper for analysis, design and construction can provide safe and reliable reference for design and construction of similar pipeline structure.
Study on Flexural Stiffness Reduction Factor of Reinforced Concrete Column with Equiaxial T Shaped Section
Authors: Feng Xiu Ling , Shen Meng , Kong Xiang Ya , Zhang Jie , Luo Peng Fei
Published: August 2013

The reduced stiffness method had been adopted to evaluate the material nonlinearity characteristics of reinforced concrete structures to be in compliance with concrete structure standards of the United States, New Zealand and Canada. Concrete structure design code in China also accepts the reduced stiffness method as a supplementary method of considering the second-order effects problem. However, the concrete structure with specially shaped columns code of China still use amplified coefficients of eccentricity to consider nonlinearity characteristics of reinforced concrete structure with special shaped columns. Based on the numerical integral method, a flexural stiffness reduction factor is proposed to consider characteristics of material nonlinearity and geometrical nonlinearity of reinforced concrete columns with equiaxial T shaped section.
The Preliminary Calculation Process of Strut-and-Tie Model
Authors: Gong Hao Jun , Su Min
Published: August 2013

By briefly introducing the main steps of using strut-and-tie (STM) , this paper showing the preliminary calculation process. In this paper, defining D-region is the very first step in design.Then paper gives the method to calculate the reinforcement needed to meet required tie capacities. In addition, checking the room for struts is also an important step in the calculation. Since it can examine the correctness of the STM designed by engineer.
The Alculation Method of Stable Bearing Capacity of Portal Frame
Authors: Chen Xu , Li Hui Min
Published: August 2013

In recent years, the portal frame structure in the actual project has been widely used, but using the finite element method calculation of stable bearing capacity of portal frame is more complex, and very difficult to the design and construction personnel. With the known stability of the cantilever column carrying capacity and the vertex of the lateral displacement under concentrated force, the establishment of the ratio of the portal frame stability capacity and the stability of the cantilever column carrying capacity both in the same concentrated force vertex lateral displacement than the relationship between the structural mechanics solver to seek out frame to the lateral displacement of the vertex under concentrated force, obtained by computing the stability capacity of the portal frame, and with the exact solution comparison and found that the methods of theoretical calculation results coincide with the exact solution, and then get an easy way of solving the portal frame stable bearing capacity. After numerical example, this method is simple, easy to master, and it has important reference value.
Spectral Characteristics and Correlation of Dynamic Wind Loads of a Typical Super-Tall Building
Authors: Zhi Lun Hai
Published: August 2013

This paper present some selected results of wind tunnel tests carried out on a typical super-tall building The variations of wind loads in the three orthogonal directions with wind attack direction were evaluated. The cross-correlations among various wind loading components were presented and discussed in detail. Furthermore, the across-wind spectral characteristics were studied and an empirical formula for estimation of the across-wind overturning moment spectrum for the super-tall building is presented. The output of this study is expected to be of considerable interest and practical use to professionals and researchers involved in the design of super-tall buildings.
Experimental Research on Load-Bearing Capacity of Frame Columns with Construction Joint under Low-Cyclic Reversed Loading
Authors: Yan Xi Kang , Dong Cheng , Chen Pei , Ma Kang
Published: August 2013

In this paper,in order to study the load-bearing capacity of frame columns with construction joint under low-cyclic reversed loading, nine specimens were made, divided into three groups.Every group had three specimens, the first were made without construction joint, the second had fine processing construction joint, the third had simple processing construction joint. The three groups were loaded in axial compression ratio of 0.23,0.34,0.46 respectively.The results show that the influence of different processing with construction joint to crack position ultimate bearing capacity,skeleton curves.
Study on Mechanical Behavior of Steel Plate Support with Oval Bolt Hole in Space Frame Structure under Combined Action of Shear Force and Tensile Force
Authors: Wang Meng Hong , He Yuan Ying , Chen Yan
Published: August 2013

The way of pre-reserving oval bolt hole in steel plate support design in space grid structure so that it can provide lateral stiffness for the structure is a common practice. However, the details about this plate support cant be found in related codes. As a result, what effect this kind bolt hole could influence on the mechanical performance of the support needs to be further studied. In order to solve this problem, a common used plate support with oval bolt holes is discussed. The contact between the bolt and the hole, the bolt cap and the plate, the bottom plate and the base plate is established respectively with the ABAQUS/Standard, which is to analysis the impact of the oval bolt holes on the load capacity and lateral stiffness of the steel plate support.
Study on Plastic Hinge Length and Limit Curvature of RC Column
Authors: Xie Yong Ping , Jia Lei , Sun Gang
Published: August 2013

The theory calculation method, test methods and experience formulas of reinforced concrete column equivalent plastic hinge length are summarized firstly. The limit state is defined as the constraint concrete to ultimate compressive strain. Finally, the simplified calculation method of equivalent plastic hinge length is proposed.
Simulation Analysis on Mechanics of Large-Span Enclosure Steel Structure Used in the Subway Station
Authors: Wu Wei , Ji Jing
Published: August 2013

This paper has carried out mechanics analysis of plane structure made of steel tube columns and the steel truss girder. Inner force analysis of steel tube column is gotten under vertical and horizontal load by adopting the theoretical calculation method. Using ANSYS software static and modal analysis of the truss girder is performed, and three order natural frequencies and vibration mode are obtained. It is verified for the rationality of the structure. At last the construction of node is given. The structure system has the advantages of simple construction and short cycle, so it can provide valuable reference for similar engineering.
Bending Test of the Composite Steel-Timber Beam
Authors: Fujita Masanori , Iwata Mamoru
Published: August 2013

In the field of building construction, mass consumption of wood materials contributes to reforestation and becomes the environmental burden reduction. However, an application to conventional timber structures only such as house has a quantitative limit. A newly developed timber structure that is able to make a large-scale building is expected. A composite steel-timber structure will be one of the effective methods to expand the structural variations. In this paper, the bending test of composite steel-timber beam classified typical joint methods is conducted to grasp basic structural performance.
Discussion of the Masonry Structure Building Underpinning Method
Authors: Zhao Kao Zhong , Han Yan
Published: August 2013

In masonry structure transformation, due to the removal of walls, force transmission path and force structure mechanism of load-bearing walls will be changed. So it become greatly important to adopt a safe, applicable, economic and reasonable underpinning method. This paper introduces several underpinning methods of masonry structure modification, which summarizes the advantages and disadvantages of them. Their characteristics and using condition are discusses in the paper. Some conclusions which are drawn may be referenced for the future engineering practice.
The Research of Test on Steel Frame Beam-Column Connections with Rib Top and Seat Angle and Angle with Two Web Node Energy Consumption
Authors: Liu Wei , Wang Guang Yun , Zhang Xiong , Yu Hai Tao
Published: August 2013

According to cycle reciprocate loads test on a beam-column connection by top and seat angles with stiffer and double web angles. It is analyzed force performance and failure mode on rib top and bottom of double angle web connection.The results show that: the top and seat angle and angle with two web connected has good ductility and energy dissipation ability.
Application and Discussion of Pressure Grouting Technology in Bored Piles
Authors: Feng Yu Qin , Zhang Lu
Published: August 2013

Bored Pile with pile-end pressure grouting technology has been widely used in high-rise buildings and large public buildings in Chinas Inner Mongolia region. Due to this bored pile take a osmosis, filled, replacement, consolidation and consolidation effect, it could have a special role on eliminating the dregs at the pile bottom and the holes hidden trouble between the pile soil and it also enhance the strength of the pile body, increasing the binding power of pile and the soil between the piles. With the result of that, the supporting capacity has a significantly improved and this technology has become the advanced scientific method of reducing the settlement of the pile foundation. By using a high-rise building projects pile example that takes bored piles with pile-end pressure grouting and static loading test, observations and determine the settlement value of the single vertical design capacity analysis methods, it shows that the pile-end pressure grouting bored piles, the layer of sand mixed capacity has been significantly improved.
Deformation Characteristics of Roller Compacted Concrete under Triaxial Stress State
Authors: Wang Huai Liang , Ren Yu Qing
Published: August 2013

Experiments of two graded-aggregates concrete used for RCC arch dam are conducted. The experiment includes three states: direct shear state, compressive-compressive-shear state and tensile-compressive-shear state. Comparison and analysis of the deformation characteristics of body specimens and layer specimens are carried out. Influences of different stress states on body specimens and layer specimens are also studied in this paper.
Debonding Behaviors of CFRP Strengthened RC Beams with Weak Interfaces
Authors: Li Sen , Wang Xiao Gang , Zhou Xin Gang
Published: August 2013

Debonding behaviors of CFRP strengthened RC beams were experimentally investigated under the influence of weak interfaces, which are induced either by defective bonding of replaced cover or expansive cracks. Shown by test results, weak interfaces impaired considerably the structural integrity of strengthening systems during loading, and easily led to CFRP debonding failure. U-strips worked effectively in preventing the integral debonding and guarantee the structural performance of flexural sheets. However, local cover delamination in the loading process and premature rupture of flexural CFRP could still take place due to the weak interface effects. Therefore, allowable tensile strain of flexural CFRP should be reduced, and more strict confinement and anchorage measures should be taken in this case.
Study on Seismic Behavior of Large Bay Brick Masonry Structures with Fewer Internal Longitudinal Walls
Authors: Ding Bao Rong , Sun Jing Jiang , Liu Zhong Wei , Du Ke
Published: August 2013

The Wenchuan earthquake and Yushu earthquake indicated that the damage of large bay brick masonry buildings with fewer internal longitudinal walls, even no longitudinal wall in the sitting room was much heavier than the ordinary buildings. In order to study this damage phenomenon, the typical buildings were analyzed. (one is large bay building, another is ordinary building) The reserve coefficient of average shear capacity is used to evaluate the seismic capacity of the structure. The analytical results show that the safe reserve coefficient of the latter one is smaller, and easy to damage. Therefore, such building in earthquake zone should add the longitudinal wall in the sitting room to strengthen the local longitudinal stiffness.
Mechanical Properties of New Type Cold-Formed Steel Box-Shaped Component Welding Section Members
Authors: Wu Sheng
Published: August 2013

Cold-formed steel box-shaped section has the special features in both its mass center and moment center unification as double symmetry section and its outstanding advantage in moment and torsion rigidity. This paper presents a new kind of cold-formed steel box-shaped component welding sections, that is flanges opposite welding box-shaped component section DS. The mechanical properties such as buckling modes, load carrying capacity, rigidity, ductility and correlation curves of new section members which are subjected to axial compression, flexure, combined compression and bending have been analyzed by using nonlinear finite element method. The consumed steel quantities of per unit load carrying capacity between new section members and the same section dimensions of cold-formed C-section members have been compared systematically, too. Some conclusions can be drawn from above work that the DS section members have some superior properties, such as higher load carrying capacity and section modulus especially subjected to compression load, sufficient section stiffener and the sub-element local buckling hard to happen and so on. They are particularly suitable to withstand axial compressive loads, but also suitable to withstand the bending moment and bending loads. The consumed steel quantities are as almost 50% as the same dimension C-section members. The DS section members can go deep into the experimental study as to be used in the practical engineering.
Finite Element Analysis on Crack Resistance Behavior of the Abnormal Joint of SRC Column and RC Beam
Authors: Zhu Jia Ning , Yang Ke Jia , Li Xiao Wen , Li Rui Wen
Published: August 2013

Based on the test of abnormal exterior joints of Steel Reinforced Concrete (SRC) column and Reinforced Concrete (RC) beam, the paper analyzed the influence on crack resistance behavior by ABAQUS, of the eccentricity of column section, the steel ratio of the joints zone, the concrete strength and the axial compression ratio and so on. The study indicates that the anti-crack capacity of the joints mainly depends on “the minor joint zone”. Based on the computing unit of minor joint core zone, the calculating formula of anti-crack capacity of the joints is deduced.
Effects of Crossing Angle on the Behavior of Buried Steel Pipelines Crossing Fault
Authors: Hassani Nemat , Shadab Far Mahdi , Kordestani Hadi
Published: August 2013

One of the most important factors that may cause a buried steel pipeline to reach the failure limit is the permanent ground displacement. In this paper, assuming SHELL element for pipeline and SOLID element for soil and also considering the interaction of pipe-soil, analysis of buried pipelines crossing fault and parametric study of pipeline behavior were performed. The results of this study show that the behavior of buried pipelines crossing fault is not sensitive to the pipe-fault crossing angle. The main reason for this is the immense strain of the pipe due to the section deformation and local buckling of the pipe body that is caused by the permanent ground displacement. The strain from this phenomenon is so great that the pipe-fault crossing angle cannot have much effect on it. The research also shows that it is better to consider pipe bending than dealing with the pipe-fault crossing angle, because it is a more important parameter in the behavior of buried pipelines crossing faults, and it has a meaningful relationship with the reached maximum strain in the pipeline.
Analysis on the Solar Collector Bracket with Finite Element Method
Authors: Gu Jun Bin , Li Yan
Published: August 2013

Parabolic trough solar thermal power generation technology is the most mature technology in the world, which is also the only commercial operation of the solar thermal power generation technology. In order to the structure characteristics of the collector was accurately simulated and the result was calculated to reflect the performance of collector, the whole model of collector established. The internal force and deformation of steel under the external load was analyzed by nonlinear finite element method. For the connection problems of rectangular frame and mirror of the collector, the strength and rigidity of collector mirror were calculated by the finite element software for ANSYS, Which circular shaft for collectors steel production process complex, transportation inconvenience, put out by rectangular frame instead of round axis, ANSYS finite element software to rectangular steel collectors strength and stiffness calculation, and the standard comparison, and to provide a useful reference for large-scale production of the solar Collector.
Design on a Total Precast Concrete Parking Structures
Authors: Fan Xin Hai , Ma Rong Quan , Liu Ming
Published: August 2013

The construction noise and wasted material of total precast concrete structure are reduced by factory production of components and assembled construction, green construction can be achieved.Combined with the first total precast parking structure in China, the connection modes of precast components are introduced,such as between precast columns and precast columns, between precast columns and precast inverted beams, between precast double tee slabs and precast columns or precast shear wall, which can provide a reference for the design of similar engineering.
Long-Term Deformations of Steel-Reinforced Concrete Columns under Sustained Axial Loads
Authors: Chen Zhou Yi , Wang Yang , Wu Jian Qing
Published: August 2013

Steel-reinforced concrete (SRC) columns have been widely used over the past few decades. However, very limited research has been conducted on the time-dependent behavior of these columns caused by creep and shrinkage under sustained loading. This paper presents the results of an experimental study of the long-term behavior of short SRC columns under sustained axial loading. Long-term axial deformations due to shrinkage and creep of the concrete were recorded. In analysis of the test results, time analysis of the SRC columns under sustained axial loads using the age-adjusted effective modulus method was proven to be suitable by employing the ACI 209 model for prediction of shrinkage and the CEB-FIP90 model for the prediction of creep.
The Antiknock Property Research of L Steel Reinforced Concrete Special-Shaped Column in the Different Thicknesses of Steel Bone in Blast Loads
Authors: Xu Pi Yuan , Ren Lin Lin , Xu Ya Feng
Published: August 2013

In this paper, L steel reinforced concrete special-shaped columns are established by the finite element analysis software ABAOUS and we simulate and analyze models in blast loads. The main purpose is to study the antiknock property of L steel reinforced concrete special-shaped column in the different thicknesses of steel bone. We change the thickness of steel bone to get the time-displacement curve of L steel reinforced concrete special-shaped columns in blast loads. On the basis of the study we draw the conclusion: the antiknock property of L steel reinforced concrete special-shaped column is better than L reinforced concrete column and with the increasing of the thickness of steel bone the antiknock property of L steel reinforced concrete special-shaped column has enhanced.
An Improved Analysis Method on the Deformation Shape of Curved Plate Girders by Cold Bending
Authors: Wang Ren Hua , Zhu Jin , Lu Lei
Published: August 2013

A typical cold bending process of curved plate girder in building construction was investigated in order to reveal the principle of deformation shape of curved I-shaped plate girder. An improved calculation method basing on geometry analysis was proposed to predict the geometric relationship between the residual deformation of curved I-shaped plate girder and the offsets of all segments in successive loading process. An example referring to the existing literatures was adopted to revise the efficiency of such an improved method. The results illustrate that the final offset distances of the key points, which were used to divide the girder into several segments with the same length, can be simply obtained by summing up the offset of each segment in once typical loading process, and the final residual deformation of curved girder was depended on the forming angle of each segment of I-shaped plate girder in once typical loading process.
Summary of Study on Composite Concrete Slabs
Authors: Wang Lei , Zhang Hong Ya
Published: August 2013

Reinforced Concrete Slab is one of the important types of composite structure, About the concrete laminated slab of the research and the engineering application are summarized, Point out that the characteristics of Composite Concrete Slabs, the application and development of the laminated slab of recent advances at home and abroad, and look into the future of the Composite Concrete Slabs research.
Research on Stability of Pretensioned Spherical Reticulated Mega-Structure
Authors: He Yong Jun , Zhou Xu Hong , Zhang Yun Fei
Published: August 2013

Pretensioned spherical reticulated mega-structure is studied in this paper. The cable arrangements and support styles of the main structure are first introduced. The static stabilities including the buckling mode and ultimate load of the pretensioned spherical reticulated mega-structure are then investigated by the ANSYS software. The influences of the key parameters such as the rise-span ratio, height of the 3D trussed beams, and the pretension value of cables on the structural stability are studied. And the optimal cable pretension values of the structures with different cable arrangement styles and different rise-span ratios are also obtained.
An Experimental Study on the Flexural Behavior of Post-Tensioned Concrete Beams with CFRP Tendons
Authors: Jung Woo Tai , Park Jong Sup , Park Young Hwan
Published: August 2013

The exploitation of FRP tendon necessitates not only to improve the performances of the FRP tendon and anchoring device but also to examine its structural performances by applying it to various structures like concrete structures. This study applies CFRP tendon on internally and externally post-tensioned concrete specimens so as to observe their flexural performance considering the number of tendons and jacking force as test variables. The tests show that the externally post-tensioned specimens undergo lesser cracks with wider distribution of the cracks than the internally post-tensioned specimens with similar jacking force. In addition, the externally post-tensioned specimens with larger number of saddles experience smaller number of cracks with larger distribution. The specimens without saddle and the internally post-tensioned specimens with the same jacking force exhibit similar behavior until the yielding of the reinforcement to show different behaviors from the time at which the eccentricities of the tendons start to vary after yielding. The externally post-tensioned specimens with saddle provide increased crack load compared to the specimens without saddle, with an increase of approximately 25% of the ultimate load.
FEM Analysis and Experimental Research of Corner Joints in Gabled Frames
Authors: Wang Yu , Ma Jun , Yu Bao Yang
Published: August 2013

The joints of corner are main connecting part of gabled frames, of which the performance directly affects the integral behavior of its structure subject to load. Some conclusions are given in the article. At the same time, the construction of joints also determines its features of the semi-rigid stiffness. In this article, numerical simulation and experimental research are conducted to investigate semi-rigid connection of corner joints in gabled frames with different height-thickness ratios of beam-column web, width-thickness ratios of flange, and height-width ratios in corner joints. The results reveal that in the gabled frames, the corner node with the inclined stiffening rib can improve the bearing capacity of the specimens. When the extraterritorial flange is tension, the erection of the inclined stiffening rib can prevent structural failure and improve effectually the ductility of the structure.
FE Analysis on the Structural Behavior of Reinforced Concrete Beam Damaged by Fire
Authors: Seo Soo Yeon , Chung Yu Gun
Published: August 2013

This paper presents an analytical result about strength deterioration of reinforced concrete (RC) beams due to damage by fire. For the evaluation of the result, three RC beam specimens were made and two of those were exposed to fire. And then beam test was performed for those including non-heated specimen to evaluate the strength deterioration due to the fire damage under simple support condition. Strength decrease of materials due to the fire was evaluated through material test for concrete and reinforcements, respectively. Nonlinear Finite element (FE) analysis was performed by considering the decrease of materials due to fire. The analysis results showed that the structural behavior of fire-damaged RC beam was able to be simulated by using FE analysis with consideration of the reduction of material capacity due to fire.
Mechanism of the Frame-Supported Masonry Shear-Wall Structure with Inter-Story Isolation
Authors: Lu Lei , Zhou Ying
Published: August 2013

Many frame-supported masonry shear-wall structures were observed severely damage in Wenchuan Earthquake. In this paper, an inter-story isolation system is implemented in such structures to mitigate the hazard of the earthquake. The mechanism of the mixed system is demonstrated by theoretical and numerical analysis. And it is concluded that the mass ratio, the below-stiffness ratio, the yield shear of isolated layer and the up-stiffness ratio are the main parameters whose effects are discussed separately. For the design convenience, a set of fitting equations of these parameters are provided.
The Element Analysis on Hysteretic Property of Cross Steel Reinforced Concrete Special-Shaped Column in Different Concrete Strengths
Authors: Li Ri Liang , Xu Ya Feng , Bai Shou Yan
Published: August 2013

In order to study the hysteretic property of cross steel reinforced concrete special-shaped column, we use the finite element analysis software ABAQUS to build 6 models of cross steel reinforced concrete special-shaped column in vertical load and horizontal cyclic load. We observe the mechanical process and the failure pattern in different concrete strength and extract hysteretic curve and skeleton curve. By analyzing two curves we know the influence of concrete strength. Simulation results show that the hysteretic property of column is better with the increasing of concrete strength and the column also has higher bearing capacity.
Research on Behavior of Rectangular CFST Stub Columns with Binding Bars under Axial Compression
Authors: Liu Hong Liang , Cai Jian
Published: August 2013

The constitutive model of core concrete was proposed, which was suitable for finite element (FE) analysis of rectangular concrete-filled steel tubular (CFST) columns with binding bars. Based on the ABAQUS FE platform, the USDFLD subroutine was compiled, which could consider the changing of Poisson ratio of many materials in loading process. A FE model was developed and used to simulate the rectangular CFST columns with binding bars. The mechanical behavior were analyzed for stress versus strain relationship curves, confined effect among steel tube, core concrete and binding bars, longitudinal stress distributions of core concrete. The results show that the FE results simulated by using constitutive relationship of core concrete of this paper are in good agreement with test results. The local buckling of steel tube is delayed which can make the yield of steel tube occur before ultimate strength of specimens, the concrete confinement of the corner regions and central regions is improved, the longitudinal stress of concrete is increased and the capacity and ductility of specimens are improved, by setting binding bars and decreasing the binding bars spacing.
Impact Response and Failure Mode for Single-Layer Geodesic Spherical Domes under Impact Load
Authors: Wang Duo Zhi , Fan Feng , Zhi Xu Dong , Dai Jun Wu
Published: August 2013

Based on the ANSYS/LS-DYNA software, the analysis for the 40m span geodesic spherical domes under impact load is carried out. By changing the mass of impact object, impact velocity and impact location, the parametric analyses on the dynamic response of the structures under the impact loading are carried out. The three failure modes of the spherical domes are summed up: local dent of structure and global collapse of structure, Punch failure of structure. Then the characteristics of the dynamic response of the structure with different failure mode, such as the impact course, impact load, speed of nodes, displacement of nodes, and stress of bars, are investigated. It is further improvement of failure mode for single-layer reticulated dome under impact.
Advances in Experimental Study on Seismic Performance of Double C Steel Joints with Gusset Plate
Authors: Chen Ming , Sun Fang Fang
Published: August 2013

It requires higher seismic performance of buildings. Double C steel structures with gusset plate have better seismic performance than general concrete structures and steel structures, and few studies have looked at its bending joints. Through the experimental analyses on seismic performance of Double C steel joints with gusset plate, we get the conclusion that this type of joints have high bending capacity, stable strength degradation, obvious initial stiffness degradation, good energy dissipation and ductility, and look forward to the development and application prospect of this compound section.
The Comparative Analysis on Calculation Methods of Vertical Seismic Response to Suspended-Dome Structure
Authors: Chen Lan , Lu De Long , Yin Xiao Gang
Published: August 2013

Based on the vertical seismic information, the vertical seismic response spectrum was calculated by Matlab Lsim function. The seismic effect of Kiewitt-Lamella suspended-dome was measured by dynamic to static ratio. According to the EL-Centro seismic wave, it analyzed and compared the dynamic to static ratios which were calculated by the following four vertical seismic calculation methods respectively: the simplified method of specification, the mode-superposition response spectrum methods based on the horizontal earthquake affecting coefficients and the vertical acceleration response spectrum respectively, and the time history analysis method. Analysis shows that: For the seismic effect, the time history analysis method is larger than the other three methods, and the method based on the vertical acceleration response spectrum is closer to the time history analysis method. Owing to large difference of the four methods for seismic effect, various methods should be adopted to ensure the safety of vertical seismic design.
Numerical Simulation of Deep Beam in Short-Leg Shear Walls Structure
Authors: Jin Bao Hong , Zhao Zi Yan
Published: August 2013

Based on the finite element software ANSYS, deep beams in short-leg shear walls structures is analyzed in this paper. Seven models which include 1 straight wall, 3 L-shape and 3 T-shape walls are established to simulate the mechanical properties of L-shape, T-shape and straight shape short-leg shear walls structures under horizontally cyclic loading. The distribution regulations of damage and stress are given out.
Introduction for Flexible Overall Hoisting Method for Extra Large Solder Ball Grid Roof
Authors: Chen Hai Zhou , Wang Yu Ling , Zhang Xiao Yong , Xie Gang Kui , Ma Rong Quan , Zhang Qi Lin
Published: August 2013

The flexible overall hoisting technique is put forward for the construction of the 30000m2 COMAC roof which is made of solder ball grid structure. The numerical simulation is carried out and the effect of unequal lifting on structural behaviors is analyzed. Numerical analysis and engineering practicing show that the overall flexible hoisting technique is with sufficient safety and obvious advantage in economy.
Research on Adhesive Property of Reinforced Concrete Sructure Strengthened with Near-Surface Mounted FRP Bars
Authors: Xu Yong Feng , Guo Wei Tong , He Teng Fei
Published: August 2013

Now concrete beams reinforced with near surface mounted FRP bars has been researched at home and abroad. This article research the Bearing capacity of concrete beams reinforced with near surface mounted FRP bars by test, and also, Immunobead binding test, infer the calculation formula of ultimate bearing capacity with near surface mounted some bars base on the the single bar.
Research on Ultimate Moment of Top-and-Seat Angle Connections in Semi-Rigid Steel Frames
Authors: Li Guo Hua , Qi Cheng Zhi , Luo Jian
Published: August 2013

Top-and-seat angle connection is a type of semi-rigid connection, usually used in steel frame. The stress distribution and the formation of plastic hinge of connection were analyzed using ANSYS. According to the results of FEM analysis, theoretical model of the top angle was proposed. And then, the ultimate moment formula of connection was proposed based on the Mises criterion. For verifying the correction of ultimate moment formula, 13 FEM models were built and ultimate moments were calculated. The formula proposed by the article agreed well with the results of the FEM analysis. And it proves that, the ultimate moment formula of top-and-seat angle semi-rigid connection can be used in the design.
Research on Space Frame Structure in Regard of Member Initial Stress
Authors: Liu Mao Qing , Xu Jun , Du Xin Xi
Published: August 2013

To reveal the harm of member initial stress on space frame structure, several models which are different in initial imperfection methods, material computational models and upper optimized stress ratios are employed to do nonlinear finited element analysis. It finds that the initial stress method and Marshall model are more accurate to simulate. When design the space frame structure, it must be avoided to optimize the cross section excessively in pursuit of economic factors.