bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Mechanical Properties of Recycled Fiber Concrete
Authors: Zhou Jing Hai , Xiang Hong
Published: September 2011

At present, green energy saving idea, aimed at protecting environment and saving energy, now has become the guiding philosophy of modern architecture. Based on this, recycled carpet waste fibers for textile mechanical properties of concrete were discussed in this paper. The application of polypropylene fiber concrete abroad has been widely used, which is becoming more and more popularly in China recent years. Meanwhile, research on the application of recycled polypropylene fiber concrete is still scarce. The experiment of this paper adopt waste polypropylene fibers as reinforcing fiber, and we make the standard specimen which size is . We use the specimen to do the research of mechanical properties of compressive strength and observing the variation of compressive strength of concrete specimen in different fiber volume. We discovered that when we add volume of 0.12% recycled polypropylene fiber and the length is 19mm, the compressive strength of concrete increases greatly. We draw the conclusion that the compressive strength of recycled fiber concrete is better than ordinary one from the experiment. In addition, if such concrete was used widely, we may reach the goals of conserving resources and protecting the environment.
Study on Time History Method of Structure with Energy-Dissipation Devices Based on Complex Mode
Authors: Bai Zhi Qiang , Liu Wen Feng
Published: September 2011

Differential equation of motion of energy-dissipation structure is established in the paper. In order to decouple the equation ,the equation is be reduced based on complex mode theory.Take a 10-storey shearing frame for an example ,selecting elcentro and taft wave as seismic motions ,structural roof displacements and relative storey displacements are be calculated and the effect of energy-dissipation dampers is evaluated.
Time and History Analysis with High Transfer Floor of Daxian International Structural Design
Authors: Ding Hai Tang , Hu Ming Wen , Hu Ming Yu
Published: September 2011

A shear wall on frame structure is adopted in the structural design of the Daxian International Building. Nonlinear time and history analysis under rare earthquake occurrence is carried out to check the elastic-plastic angular displacement limits and to identify structural weaknesses. The structural model is modified to improve seismic performance and ductility of the building based on the calculated results. The process and procedure of the structural design can act as a sound reference for similar structural designs during ensuing engineering endeavors.
Analytical Behavior of Rubber Concrete-Filled Steel Tubular Columns under Cyclic Loading
Authors: Liu Yan Hua , Bai Yi Kui , Jiang Guo Hui
Published: September 2011

Keywords: concrete-filled steel tube; rubber concrete; analytical behavior; rubber replacing ratio; hysteretic behavior. Abstract: This paper presents a finite element analysis (FEA) model for the rubber concrete-filled steel tubular columns under cyclically increasing horizontal displacement loading. The cyclic load versus lateral displacement hysteresis curves was calculated by using FEA model to investigate the behavior of the columns. Based on the theoretical model, the influences of different column cross-section type (square, rectangular and circular) and rubber replacing ratio on the lateral load versus lateral displacement skeleton curves and rigidity degradation curves of rubber concrete-filled steel tubular columns were discussed.
The Principle and Calculation Method of Carbon Fiber Reinforcement for Tunnels and Underground Structures
Authors: Pan Hong Ke , Hu Jiang Chun , Yang Lin De
Published: September 2011

There will emerge cracks or damage due to the action of rock pressure or its own shortcomings and low strength for the lining structure in tunnel or underground engineering, especially at the places of excessive bending moment and tensile stress because of bias pressure where concrete will be pull apart for the deficiency of strength even to cause leakage and durability insufficient. Conventional maintenance and reinforce methods are time-consuming and laborious, and the effect is also not ideal. It is simple, timesaving and having a significant and lasting effect to use carbon fiber reinforcement method. This paper studied structure’s failure mechanism and on the basis of that the principle of fiber-plate reinforcement from the angle of structural plastic development, then studied the improvement of structure’s mechanical character and the change of design calculation method for single section of underground structure with carbon fiber plates by using the research method of plane-strain. At the same time, the typical model of integral failure for single section was analyzed and the calculation method and formulae of bearing capacity and reinforcing steel bars were deduced, which remedied the shortfall in the design specification for concrete structure. In the end, by comparing the calculation results of structure with fiber plates and that with not fiber plates based on engineering example, the conclusion that structure’s bearing capacity and capability of resistance to deformation had obvious improvement was obtained.
Study on the Bridge Deck Pavement Strengthened by Planted Steel Bars of the Hollow Slab Bridge
Authors: Zhao Shao Wei , Gu Jian Chao
Published: September 2011

In this experiment, three beams are chosen from a used hollow slab bridge, and one of them is reinforced by planted steel bars in old pavement and others are left intact or cleared away from old pavement for comparison with the first one through static lastage pressing experiments. The research results show that planted steel bars between pavement and beam can enhance the connection, upgrade rigidity and change the flexural behavior .The study may also be taken as a reference of the bridge reinforcement’s research.
Experimental Study on Axial-Compression Reinforced Concrete Column Strengthened by Circular Steel Tube
Authors: Wang Mei Hua
Published: September 2011

In the case of small increase of cross-section, concrete column strengthened by circular steel tube can increase the bearing capacity greatly as well as ductility. This has resulted in engineering welcome. This paper studied the common work performance of reinforced concrete column strengthened by circular steel tube in three different conditions test of axial compression. The results show that outsourcing steel and core column can be achieved interaction. By strengthening, it can improve the load capacity of the concrete column as well as ductility. With the increase in initial load, although it has little effect on the bearing capacity of reinforced columns, it can affect the ductility to some extent. This paper can provide experimental basis for engineering applications.
Review and Prospect on Modal Parameter Identification of Spatial Lattice Structure Based on Ambient Excitation
Authors: Liu Cai Wei , Wu Jin Zhi , Zhang Yi Gang
Published: September 2011

With the continuous development of national economy and the construction technology, a lot of large-span spatial structures with unique form and complex construction are emerging. The health monitoring system that mainly used in bridge structure is applied in large-span spatial structures gradually. Parameter identification and damage alarming are the core technology of health monitoring. In this paper some structural modal parameter identification methods based on ambient excitation are introduced. Finally, for large span structures with characteristics of low-intensive modes, the response data based on large span structures for modal parameter identification method was summed up, and the critical issues for further research in this field are also presented.
Research on Isolated Strengthening of Erose School Buildings
Authors: Fan Xi Sen , Ren Shu Zhen
Published: September 2011

The aseismatic strengthening technique for masonry structure was researched in this paper. The seismic response of a L-type school building with and without isolation system were computed by using software SAP2000. The isolation system were made up of lead rubber bearings or combined Isolation system. The results showed that base-isolated strengthening can reduce not only the translational response but also the torsional response with earthquake. The combined Isolation system was more effetive in decreasing translational response than the lead rubber bearing, but inferior to in decreasing torsion response.
Compactness Inspection Methods for Epoxy-Bonded Steel Plates of Bridge Strengthening
Authors: Xie Jun , Wang Guo Liang , Zheng Xiao Hua , Zhou Yi Shu
Published: September 2011

Construction quality of epoxy-bonded steel plates is not easy to check for absence of inspection standard in situ. In this paper inspection methods of the critical evaluation factor-bond compactness of epoxy- bonded steel plates, hammer test based multi-level grids and infrared holography, are proposed by theory analysis ,specimen experiments and practical validation in engineering. In final he suggestion on the practical usage of these two methods are also presented.
Studies on Fire Resistance of FRP Shear Strengthened Reinforced Concrete Beams
Authors: Fan He , Fan Ze
Published: September 2011

Fire-resistance performance experiments with static loading-fire are investigated about two carbon fiber sheet (CFS) shear strengthened reinforced concrete (RC) beams exposed to the ISO834 standard fire. Shear strengthened RC beams are wrapped with fire insulation material- thick painted fire retardant coatings. Relationship between measure points’ temperature and time are achieved. The results suggest that: the ratio of shear-span is the main factor to fire-resistance rating and failure modes of CFS shear strengthened RC beams in fire; shear-failure fire-resistance rating are increased by thickening fire insulation to shear strengthened RC beams. A computer program is developed to calculate the temperature fields of fire insulated concrete beams shear strengthened with CFS coated thick fireproof material. This program is validated comparing with experimental results. Researches can give a supplement to produce overall fire-resistance factors of CFS shear strengthened reinforced concrete beams at high temperatures.
Tall Building Structure’s Heightening Reform and Elasto-Plastic Analysis
Authors: Wang Qin , Chen Pei Xia , Zhang Xin , Tang He Qi , Xu Yang
Published: September 2011

Aim at one tall building structure model, which is a nonlinear three-dimensional finite element model. ANSYS FEM software is used to set up the structure model, proceeding modal analysis on natural vibration period and vibration model; ANSYS FEM software is used to import El Centro and Taft acceleration time-travel curves, which are used in 7 degree film, proceeding elasto-plastic analysis, and compared with the result of PKPM software earthquake static effect, the layer displacement calculation results contrast between two software shows it is consistent, but contrary results occurs in ISDA. So for the similar project design auxiliary FEM analysis is needed; Seven degree rarely met earthquake acceleration time-travel data and larger seismic peak acceleration time-travel imported to research the plastic development.
Stability Analyses of Single Arch in Arch-Reticulated Shell Hybrid Steel Structure of Beijing Jiangtai Winter Garden
Authors: Shi Yong Jiu , Gao Yang , Wang Yuan Qing , He Xiao Ping
Published: September 2011

Global stability analysis cannot be ignored for large-span spatial steel structures. Beijing Jiangtai Winter Garden adopts hybrid structure with latticed shell and vertical cables, on which glass curtain wall is fixed. Therein the reticulated shell is composed of 9 spatial arches and other common frames, thus it can be seen as arch-reticulated shell hybrid structure. This paper analyzes the stability of one single arch structure which has the largest span in the whole structure, including buckling analyses and non-linear full range analyses. The results show that the stability of single arch meets requirements, and the nonlinearity has great influence on the stability of single arch structure. Besides, although the initial geometric imperfection has certain effect on the elastic structure, it has little effect on the elasto-plastic one.
Residual Stress Analysis by Mutiple Sequential Coupling for Non-Scallop Welding Joint
Authors: Zhang Lei , Li Jun , Gu Zheng Jun , Zhang Ye
Published: September 2011

In this paper, the non-scallop welding joint as the research object is analyzed by ABAQUS software where the implicit analysis method is used to define the residual stress distributions. Based on the thermal analysis, the non-linear quasi-static analysis is also taken, and then the results are compared with the experimental results. The results demonstrated higher accuracy of the finished simulation.
Seismic Behavior of Concrete-Filled Square Steel Tubular Column-to-Beam Connections with through Diaphragm
Authors: Miao Ji Kui , Chen Zhi Hua
Published: September 2011

This paper studies seismic behavior of concrete-filled square steel tubular column-to-beam connection with through diaphragm, which is popular in Japan, but rarely used in China. Four full-scale cruciform specimens are tested under low-cyclic reversed load and the result of study indicates that diaphragm-through joints have stable hysteretic characteristics and enough energy dissipation capacities to be used in the field. Details of the steel beam flange connecting with the diaphragm have obvious effects on joint ductility and energy dissipation, and the seismic behavior of joints with circular fillet at the connecting zone are better than that reinforced by taper plate welded to the beam flanges. For the specimens failed in the beam, diaphragm thickness, size of concrete cast holes, width-to-thickness ratio of the tube, and the level of axial load in the column have less influence on joint seismic behavior.
Research Progress in Size Effect of Reinforced Concrete Members and Comparative Analysis of Applications of Codes
Authors: Guo Er Wei , Li Zhen Bao , Zhou Hong Yu , Du Xiu Li
Published: September 2011

Abstract. Size effect, referring to mechanical properties of materials change with the geometry changes, is the basic characteristic of brittle and quasi-brittle materials. Researches show that for the concrete material, compressive strength, split tensile strength and tensile strength decrease with the size of components increases, for RC structures, size effect also exists. The development and current situation in size effect are presented from three aspects, including concrete, RC members and the application of the code. And then, the developing trends of size effect of RC members are proposed.
Discussion on the Influencing Factors of Cracking Bending Moment in Prestressed Concrete Hollow Slab
Authors: Cui Xiu Qin , Guo Bing , Feng Zhong Ren
Published: September 2011

The numerical analysis method is applied to simulate the whole process of bending. Keeping the section dimensions and the types of loads constant in prestressed concrete hollow slab with mid-strength spiral-rib steel wire, strength of concrete, strength of steel bar, reinforcement ratio, span-depth ratio and stretching control stress are analyzed and compared. The influence of strength of concrete, strength of steel bar, reinforcement ratio, span-depth ratio and stretching control stress on ratio of cracking bending moment and design bending moment of prestressed concrete hollow slab is discussed by numerical simulation.
Research on the Structure of Traditional Residential Energy-Saving in Hot- Summer and Cold-Winter Zone
Authors: Jun Lu , Li Jing
Published: September 2011

According to the climate feature and the energy-saving requirements of traditional residential in hot- summer and cold -winter zone in china, we proposed the transformation scheme for the external structure of residential. The main points of the appropriate technical measures for the project also have illustrated clearly.
Research on Mechanical Behavior of Reinforced RC Beams Strengthened with Anti-Arch Method
Authors: Chen Dai Guo , Yao Yong , Deng Yong Jun
Published: September 2011

We analyze the mechanical property of strengthening RC beam by using the method of arch pasting with carbon fiber and directly pasting CFRP through numerical simulation and model test. It explains that strengthening RC girder by using the method of arch can solve the influence of beam's loading by the second time which exists in the method of pasting CFRP in strengthening reinforced concrete beams and it can improve the girder's load when it cracks and the carrying capacity; decreasing the deflection deformation and crack width and gap when the girder carries load; It can make the most use of the character of carbon fiber's high strength. The results play very important role of guiding to engineering.
Defect Analysis and Strengthen Design Research of Ramp on Queshi Bridge
Authors: Wang Peng , Chen Jin , Peng Yi Bin
Published: September 2011

The paper completely analysed the cause of bridge defect with the project profile of the Queshi bridge. And relation to different defect , the paper gave the reinforcing design and the main maintenance using the construction features.
Nonlinear Static Analysis for Progressive Collapse Potential of RC Building
Authors: Wang Tie Cheng , Li Zhi Ping
Published: September 2011

In this study, the progressive collapse potential of a 10-storey concrete frame structure was investigated using nonlinear static analysis. 15 different cases were considered and their performances were compared with each other. From the nonlinear static analysis results, most of longitudinal beams in upper floors and slabs above the failure column would collapse as the results of removing an exterior column, no beams and slabs would collapse when an interior column at ground floor was removed, and only the short-span beams in superstructure would collapse when an interior column in upper floors was removed. Tie force reinforcement along floors and beams of edge span can be used to avoid the progressive failure of floors, after failure of particular column.
The Shear Resistant Effect of RC Beam Strengthened with SWR External Prestressing under Cracking Width of the Original Beam
Authors: Yu Tian Lai , Hou Xian Bin , Tian Lei Lei
Published: September 2011

Through the experiment of the four RC beams strengthened with SWR externally prestressing, the shear resistant effect of Strengthened beams under cracking width of the original beams is studied in the paper. The ultimate load was confirmed by the test of the basic beam. First the presplitting load were respectively 50%, 60%, 70%, 80% of the ultimate load of basic beam, and seconly cracks were repaired with JN-L low viscosity pouring sealant, lastly experiment beams were strengthened by shear reinforcement of the external prestressing with steel wire rope. Loading method is the single point loading, and the shear span ratio is 2.0. The results show that: the cracking width of original beam has certain effect in shear resistant capacity. When the cracking width was less than 0.2 mm, the effect of injecting glue was not ideal and the shear resistant capacity is lower. When the crack width was bigger, the effect of injecting glue was more ideal, so the effect of reinforcement was better. When the cracking width was greater than 0.28 mm, the ultimate load was no longer improved. The smaller inclined cracking width in strengthening is, the worse repairing effect and the bigger strain value of stirrup is. Each strengthened beams’ wire rope strain increment was nearly close before cracking. As the decrease of original beams crack width, crack repair effect was weak, and the external strain increment of wire rope becomes bigger under the same load. The trend was very clear after the stirrup yielding.
Numerical Analysis of Internal Flow Field in an Impeller with the Time Marching Method
Authors: Wang Cai Hua
Published: September 2011

Centrifugal compressors are power machineries used widely. Fully understanding of the complex three-dimensional flow field is very important to design higher pressure ratio, higher efficiency centrifugal compressor. In this paper, time marching method is adopted to solve the three-dimensional viscous N-S equations under the relative coordinate system. The internal flow field of the “full controllable vortex” high speed centrifugal impeller is analyzed and the medial velocity vector distribution and the development of the velocity of each section in the impeller are showed. From the figures, it can be seen that the “wake” phenomenon, such as Ecckart described, caused by the curvature, Coriolis force and the boundary layer is exist
Influence of Uniaxial Tensile Cyclic Load on the Porosity of High Performance Concrete
Authors: Jiang Fu Xiang , Zhao Tie Jun , Hao Ming Lei
Published: September 2011

The total porosity of the high performance concrete under cyclic loading was measured in this present paper. Results show that finite cycles of cyclic axial tensile load causes permanent damage to concrete, which can be measured after unloading. The higher the applied upper load level or the more the cycle number is, the more obvious will be the connection and development of micro cracks. Then the higher will be the total porosity. Especially, with the increase of cyclic load number, the total porosity of the concrete shows obvious stage characteristics. And there is a linear relationship between the total porosity and cyclic loading cycles in the second developing stage of fatigue strain.
Axial Load on the Submarine Pipeline Suspended Law of Vortex Induced Vibration
Authors: Yan Yi Fei
Published: September 2011

The study is about submarine pipeline. Considering the impact of different axial force, The reduced velocity is introduced as the pipeline vibration effect of vortex trail releasing. The vibration parameters of the span pipeline are analyzed and vibration control formula is built. The natural span length of the submarine pipeline is calculated according to the DNV-OS-F101 rule. The natural frequency of the span pipeline and the allowable span length are solved. The case study of submarine pipeline in Chengdao oil field is made and the variation law of natural frequency of span pipeline is got. The stream reduced velocity decreases as the axial force increase. The theory analysis of the vortex induced vibration can provide the scientific basis for the safety design of offshore submarine pipeline.
Determination of Minimum Width of Slab Rib between Bores of Tubular Hollow Slab on Cast-in-Place Concrete
Authors: Zhang Rong Lan
Published: September 2011

Shear mechanism of the cross bore slab of tubular hollow slab on cast-in-place concrete is set forth. Shear force and normal stress are calculated for each section of cross bore slab of tubular hollow slab with supported in one-way direction. We can put forward suggestions based on the three conditions. One condition is that shearing stress is no more than shearing resistance on cross bore slab. Another is that tensile stress on rib of cross bore slab is no more than tensile strength of the concrete. The last one is that concrete shearing stress on rib of parallel bore slab is less than its shearing resistant strength. Meanwhile one example is given. So that we can obtain the requirements for minimum rib between bores of tubular hollow slab.
Influences of Climate Change on Reliability of Bridge Superstructure
Authors: Xie Hui Bing , Wang Yuan Feng , Liu Ming Hui
Published: September 2011

Global climate change, including climate deterioration and extreme weather events, has serious impacts on reliability of bridge superstructure. Global warming and increasing velocity of wind associate with the increase of CO2 level play a dominate role in reliability degradation. For the highway bridge in offshore environment, a main factor of reinforcing steel corrosion is the invasion of chloride ion, which can cause durable damage of the structures. Moreover, temperature rises will increase corrosion rates. In addition, changes in maximum wind speeds may increase expected wind loads on bridge structures. This paper develops a reliability analysis model to assess the reliability degradation of the highway bridge superstructure under (i) base case, (ii) temperature rising case, (iii) wind speed changing case, and (iv) combination of case (ii) and case (iii). The process is illustrated by studying the reliability of a offshore highway bridge using simplified models of the structure. It is demonstrated that the reliability degradation will be greatly accelerated taking account of climate change. The life expectancy of the structure will be 10 years and 70 years lower than base case if the target reliability is 4.5.
Static Wind Load and Gravity Coupling Effect of Tall Structure
Authors: Zhong Zhen Yu
Published: September 2011

The cantilever beam model of tall building structure which includes lateral wind load and vertical gravity coupling has been established in the paper. The form of finite difference has been concluded from equations of the model acted on static wind load. Amplified coefficients of bottom moment and top displacement are calculated and analyzed. The result shows that gravity second order effect of tall buildings will be enhanced when ratio of gravity rigidity or ratio of bending and shearing rigidity increase.
Durability of Glass Fiber Reinforced Polymer (GFRP) Bar Used as Concrete Reinforcement: Temperature Effect
Authors: Huang Jian Wei
Published: September 2011

This paper presents calibration of service temperature on the prediction of long-term performance of GFRP bar in reinforced concrete structures. Two approaches, based on monthly average temperature and yearly average temperature are proposed to simulate the real service condition on the RC structure for the study on long-term performance. A design example for the comparison of results by the two approaches is presented.
Guided Wave Tomography Using Simultaneous Iterative Reconstruction Technique Improved by Genetic Algorithm
Authors: Zhang Hai Yan , Yu Jian Bo , Chen Xian Hua
Published: September 2011

Guided wave tomography has shown great potential for quantitative nondestructive evaluation in structural health monitoring. An improved simultaneous iterative reconstruction technique (SIRT) combining genetic algorithm (GA) is presented in order to improve image quality of guided wave tomography. The simulated reconstructed images of flawed plate and pipe using usual SIRT and improved SIRT methods have been compared quantitatively and qualitatively.
Finite Element Analysis of Small Marine Diesel Engine Crankshaft
Authors: Zheng Bin , Liu Yong Qi , Liu Rui Xiang , Meng Jian
Published: September 2011

In this paper, with the ANSYS, stress distribution and safety factor of crankshaft were analyzed by using 3D finite element method. The results show that the exposed destructive position is the transition circular bead location of the crank web and the crankpin. Maximum stress is 121 MPa. Safety factor is 3.12. Maximum deformation is 0.0719 mm. Crankshaft satisfies the design requirement.
A Study of Aerodynamic Effects of High-Speed Trains through Tunnels
Authors: Zhao Jing , Li Ren Xian
Published: September 2011

In this paper, the aerodynamic effects of high-speed train passing in tunnels are investigated in numerical calculation method of hydromechanics. According to the actual situation of flow filed when the train through the tunnel, the flow geometry model is set up. The flow problem is described by Navier-Stokes equations of unsteady viscous compressible fluid and k-e two equations turbulent model. Thereby the aerodynamic effects of the train through the tunnel are analyzed comprehensively. The changes of the air pressure in tunnel caused by high-speed train entering into the tunnel are mainly analyzed. In addition, the mechanical characteristics of carriages when two train in the tunnel passing through each other are analyzed.
Stress Intensity Factor for a Thin-Walled Cylinder Containing an Edge Circumferential Crack under Bending
Authors: Bai Yang , Wang Jian Wei
Published: September 2011

Thin-walled cylinder, circumferential crack, pure bending, J-integral, stress intensity factor
An Efficient Multi-Objective Optimization Method for Complicated Vehicle Random Vibration
Authors: Xu Wen Tao , Miao Tong Chen , Liu Zheng
Published: September 2011

In this paper, a new approach is proposed and addressed for designing vehicle suspension systems based on the scheme of multi-objective programming. For complicated vehicle random vibration, a linear model is used to describe the dynamic behavior of vehicles running on randomly profiled roads. The road irregularity is regarded as a Gaussian random process. Pesudo excitation method has been used to solve the dynamic responses. And a Kriging model is introduced to build the approximate mapping relationship between the design variables and the responses. Optimal solutions are derived by means of the method of centers for structural optimization with multiple objectives. Numerical examples are given, and compared with other optimization methods.
Large Eddy Simulation of Flow around a Cylinder at Re=3900 Using a CFD Code
Authors: Li Yao Zhen
Published: September 2011

Flow over circular cylinder at Reynolds number 3900 is studied numerically using the technique of Large Eddy Simulation .As a result, strong three-dimensional characteristics are revealed in flow around a cylinder at Re=3900. As spanwise and streamwise mesh refinement is done respectively, result improves similarly. But the CPU time consumed is too much when refinement meshes are used. Also the simulation result with Smagorinsky subgrid-scale model is investigated to be better than subgrid-scale k model.
Critical Initiating State and 2D Lagrangian Analysis of Pressed TNT
Authors: Huan Shi , Tao Wei Jun , Huang Feng Lei , Jiang Guo Ping
Published: September 2011

Shock initiation experiments on the explosives pressed TNT was performed to obtain in-situ pressure/radial displacement gauge data for the purpose of determining the Ignition and Growth reaction flow model with proper modeling parameters. The pressure and radial displacement were got by manganin-constantan composite 2-D Lagrange sensor. The particle velocity, relative volume, internal energy and fraction reacted of shock initiation process has been calculated by 2-D Lagrangian analysis method.
Optimal Measurement Placement for Material Parameter Identification of Orthotropic Composites by the Finite Element Method
Authors: Huang Li Xin , Guo Xiang Wu , Du Bo Tao , Zhou Xiao Jun , Liu Yu Yin
Published: September 2011

An algorithm of the optimal measurement placement is proposed for the material parameter identification of two-dimensional orthotropic composites, which is modeled by the finite element. From the analysis of the system sensitivity matrix of the parameter identification processes using the Levenberg-Marquardt method, A-optimality criterion related with the Fisher Information Matrix (FIM) is selected for the criterion of the optimal measurement placement. Thus, the algorithm for selecting the optimal measurement placement can be constructed. A numerical example is given to demonstrate the effectiveness of the proposed algorithm. The example reveals that the measurement placement has a significant influence on the identification results.
Size Dependent Uniaxially Loaded Stability of Triaxial Weave Fabric Composites
Authors: Hafidzi Muhammad Nor , Hong Kueh Ahmad Beng , Rasin Norhidayah , Mohd Yassin Airil Yasreen , Mohamad Hisham
Published: September 2011

This paper explores the size effects on the stability of simply supported triaxial weave fabric (TWF) composites subjected to a uniaxial compressive load. Three material expressions: homogenized, segmentation, and classical lamination theory are subscribed as the constitutive relation for the 2D composite finite element model used in the study. Remarkable dependency of critical buckling load on the material size is exhibited in all models, the least affected being those of homogenized and segmentation.
Excavation Stability Analysis for Consequent Rock Slope of Hydroelectric Power Station
Authors: Li Xu Dong , Su Chao
Published: September 2011

Many hydroelectric power stations are constructed on rock foundations. Therefore, the stability of rock slope is critical for the engineering especially in the excavation state. The analysis for consequent rock slopes is not identical with the earth slope because of their material characteristics. In this paper, it is combined the elastic-plastic finite element method and safe factor strength reduction method for the solution of problem. Considering the multi-layer material of the rock slope, Drucker- Prager criterion is adopted for determining the yield station which has the modified format of Morh-Coulomb criterion overcome the corner point problem of application proper for rock material. The conditions both of displacement mutability and cut-through of plastic zone are described in detail and research deep for failure judged. Analysis and compare of the situations which contain displacement, plastic zone between pre-excavation and post-excavation by certain numerical example, some useful results are given for stability analysis of consequent rock slope.
Simulation Analysis of the Shield Construction Modeling Influence Based on FLAC3D
Authors: Wang Hong De , Cui Tie Jun , Qin Yu Bin
Published: September 2011

Basing on FLAC3D (Fast Lagrangian Analysis of Continua), the shield tunnel construction process is simulated, and the influence factors and their interaction for modeling are analyzed. Firstly, combing the influence factors on the reciprocity of the shield precursor with the rock-soil mass, the excavation process is simulated; at the same times, the tunnel ground subsidence and the tunnel upper vertical stress are calculated. Secondly, by mean of removing one of the factors from the stimulating model respectively, the parameters corresponding with them are also calculated. Finally, basing on Fast Fourier Transform, the ground subsidence and the vertical stress are analyzed by comparison, and the influence effects for modeling of all kinds of the factors are found out. Experimental results show that, on one hand, the influence effects to the ground settlement are more than to the vertical pressure of the tunnel; on the other hand, the factors to the simulation results include the soil-rock stress of the excavation workface causing by the shield boost, the temporary low support strength causing by the grouting at the end of the shield delaying the shield tunnel segment assembled and the soil-rock torsion force of the excavation workface causing by the shield cutterhead running.
Analysis of Factors Influencing Spatial Stiffness of Cable-Strut-Supported Rigid Shell Structure
Authors: Kong Dan Dan , Zhao Xin , Wu Mai
Published: September 2011

Long-span hybrid structures have been widely used in recent years. Composition and working mechanism of cable-strut-supported rigid shell structure of a gymnasium roof are analyzed in this paper. Influences of different type of supports and bracing members on the spatial working property of this hybrid structure and factors that influence stiffness of the structure are analyzed too. Analysis results identify the formation mechanism of spatial stiffness of the hybrid structure. The research results can shed light on study and designing of the same kind of structure.
Safe and Effective Way to Using Urban Sites of Ground Fracture
Authors: Fu Guang Yao , Zeng Fan Sheng , Tian Min
Published: September 2011

Speaking of the existence ground fracture disaster's city, have to ensure the safety of various types of civil engineering structures, and also be effective to use city land, this is the problem which need civil engineers to research and solves. With Xi'an ground fracture sites as the background to discuss this issue, from the vulnerability classification of urban land, the building importance rating, structural safety performance research so on, propose several methods of the ground fracture field can be effectively to use, final several good cases are given through the investigation and analysis. These methods are: In the ground cracking or possible cracking sites, with urban and community plan, can consider the layout of a city square and green space; unimportant temporary buildings can be built in the main deformation zone of the ground fractures; For the ground fracture activity tends to be stable, or to be in the sleep, the safety of multistoried buildings crossing fractures can be met; Determining the important building's minimum required secure distance, needs through the structure safety performance analysis and the research.
Virtual Transportation System in Natural Disasters: A Case of Jiangsu Province
Authors: Li Xiao Hui , Tan Qing Mei
Published: September 2011

To meet emergency logistics need pre- or post-disaster, a topology network-based approach is introduced to solve the complexity of highway transportation system. It classifies the transportation system into sub- networks and central networks where a virtual local area network is designed in order to fulfill function of information exchange and road condition renewal between different forwarding stations. To renew real-time road conditions and data in terms of business or operation for each node, a virtual transportation network is designed based on foundation of central networks, which consequently reduces algorithm measure and also speeds up path-selection procedure.
Mechanical Properties of Large Scale Confined Concrete
Authors: Song Jia , Li Zhen Bao , Xie Yong Ping , Du Xiu Li , Gao Yue
Published: September 2011

An experimental study was made of the mechanical properties of large scale confined concrete subjected to the axial compression test. Eleven tied concrete columns and six plain concrete prisms were tested. In the test, each specimen had the same transverse reinforcement configuration, and similar volumetric ratio of lateral steel, while different size. The test results in this paper indicate that the size of the specimen has no obvious relationship with the ultimate strength, however, it does affect the post-peak ductility to some extent. As a supplement to the experimental study, a finite element method was adopted to imitate the mechanical behavior of the confined concrete under axial compression. The results of the imitation in this paper indicate the confinement mechanism of large scale specimens.
Structural Physical Parameter Identification Based on Empirical Genetic-Simplex Algorithm and Structural Dynamic Response
Authors: Jiang Li Ping , Liu Wei , Shi Lei , Liu Yan
Published: September 2011

In the complex conversion analysis of multi-degrees of freedom，large calculation count needed in each calculation step of Genetic Algorithm limits the running speed of genetic algorithm. So the positive calculation count to be reduced is an effective method to enlarge the range of GA’s application. Empirical Genetic-Simplex Algorithm (EGSA) proposed in this paper is one of the effective methods to solve the problem. This method is applied to structural physical parameters identification based on the structural dynamic response. The result shows that EGSA has many advantages on precision, efficiency in searching, strong to resist the noise, and good adaptation to the incomplete information.
Simulation of Bridge Collapse in Virtual Scene Based on Finite Element Analysis
Authors: Xu Zhen , Lu Xin Zheng , Ren Ai Zhu , Lu Xiao
Published: September 2011

To replicate the scene of bridge collapse realistically, accurately and completely, this paper proposes a scene simulation method of bridge collapse based Finite Element (FE) analysis. On the basis of suitable scene model of bridge, 3D animation of bridge collapse is implemented by the callback of graphics engine Open Scene Graph (OSG) and special effects of bridge collapse are also created by physics engine physX. In addition, terrain and surroundings are added into the scene simulation. The collapse animation proves to be consistent with FE simulation by comparison and the scene simulation is more realistic and complete due to the special effects and the rich scene. This study provides an important reference for analysis of collapse accidents of bridges.
The Study of Reverse Algorithm about the Optimal Driving Function of the Luffing Mechanism of Truck Crane
Authors: Han Ze Guang , Yang Ming Kun , Hao Rui Qin , Yu Hai Yang
Published: September 2011

In this paper，the model of dynamic simulation about the truck crane’s luffering mechanism has been established. The optimal expression of the driving function of amplitude cylinder for the constant velocity hoisting of crane boom has also been acquired through the method of dynamic reverse algorithm by using the adams. It can provide the reliable basis for the power control of the luffing mechanism of truck crane. The results come from the simulation in all working condition of various operating of the luffing mechanism of truck crane show that the above method is effective and has a certain application value.
Advanced Analysis of Steel Frame Structures Comprising Non-Compact Sections
Authors: Wang Lian Kun
Published: September 2011

The conventional advanced analyses assume the sections to be compact, and do not account for the degradation of the flexural strength caused by local buckling. Since the sections of real structures are not always compact, the analysis should be improved to consider local buckling. Based on the finite element model, using flexural tangent and axial tangent modulus to consider the effect of local buckling, a concentrated plasticity method suitable for practical advanced analysis of planer steel frame structures comprising non-compact sections is presented in the paper. The accuracy and precision of the method is established by comparison with steel frame tests.
Development of a Simulation System of Coal-Mine Work Training
Authors: Li Da Jin
Published: September 2011

Strengthening the practice training is a primary means to ensure the safety in coal production. To solve the limitation of traditional work training method in coal industry, a Simulation System of Coal-Mine Work Training (SSCMT) is developed based on VIRTOOLS. With the system, the trainees can complete various operating training and study various operating regulations in a virtual coal-mine working environment. The paper makes a detailed explanation of the design and development of SSCMT from the following aspects: system functions, creating a virtual environment, training evaluation, system optimization. The realistic application demonstrates that the SSCMT system has brought good results in reduction of training cost, stimulation of learning interest, and improvement of training quality.
Computer Simulation of Static Buckling of Double-Layer Portal Frame
Authors: Kang Zuo Yi , Han Zhi Jun , Lu Guo Yun , Liu Zhi Fang
Published: September 2011

The buckling of no-way double-layer portal frame that column is fixed is simulated by using ANSYS. Through analyzing the portal frame subjected to different loads on the roof of the structure that are uniform load, trapezoidal load and triangular load, the critical buckling load of the double-layer portal frame and buckling mode are obtained. The regular between the critical buckling load and the form of the load on the roof can be acquired by the analysis of the results, which can be used as a reference for engineering application.
Three-Dimensional Ocean Wave Simulation Based on Directional Spectrum
Authors: Guo Qiu Ying , Xu Zun Yi , Sun Ying Jun
Published: September 2011

Simulating real virtual ocean environment is necessary for the research of interaction simulation of underwater gravity aided inertial navigation system. One of the key techniques of realizing virtual ocean environment is modeling and simulating three-dimensional ocean waves. Numerical simulation of three-dimensional ocean waves in the case of different wind speeds is realized using MATLAB based on directional spectrum composed of Pierson-Moscowitz frequency spectrum and directional spreading function. Experiments show that the simulation speed is fast and the simulation results are vivid if suitable simulation frequency band, interval of wave frequency and interval of direction angle are selected. The simulation can provide some technological supports for interaction simulation of gravity aided navigation system for underwater vehicles.
Finite Element Simulation of Metal Structure for Container Stacker Based on Ansys
Authors: Li Zhi Jian , Zhang Jian Kun
Published: September 2011

The finite element model of metal structure of 45 tons container stacker is established and Ansys software is employed to calculate the stress of key parts. The skill of model processing of the complete machine and the boundary condition of calculation model is described. The calculation results are used to guide the design of the container stacker.
Simulation of Charge Structure Effect to Integrated Rock Blasting
Authors: Zhou Neng Juan , Nie Lei , Shen Shi Wei , Xu Li Na
Published: September 2011

Different charge structure has an important influence on explosive energy efficiency and rock blasting effect. On the basis of Misses strength theory, using ANSYS/LS-DYNA to simulate the integrated rock blasting effects under different charge structure conditions, including continuous coupling charge, continuous decoupling charge and interval charge. And the effective stress-time curves of typical elements are compared to analysis. The results show that air as a decoupling medium plays a good buffer function, which is an ideal charge form. And interval charge has a better effect to buffer the pore wall peak pressure, thus reducing the destruction around the blast holes.
Correlation Analysis of Computer Simulation with Full-Scale Impact Test for Barrier Safety Evaluation
Authors: Shao Xin Peng , Ji Hui , Yan Shu Ming , Li Qi Qian , Jia Ning , Jing Min , Ma Liang , Jing Kun , Liang Ya Ping , Yu Hai Xia
Published: September 2011

In order to analyze the feasibility of barrier safety performance evaluation with computer simulation method, finite-element models of various vehicles and barriers were set up and simulations results are compared to multiple full-scale impact test data. The results indicate that all safety performance index such as vehicle trajectory, structural adequacy, occupant risk and dynamic deformation can be extracted from computer simulation and FEA results are coincident with those of tests with error less than 10%. Computer simulation method is proved to be highly feasible for safety performance evaluation of barriers. The concept that simulation models must be verified through tests is stressed and the suggestion that laws and regulations on professional audit and management of CAE engineers should be completed is brought out.
Research on Numerical Simulation of Flow-Field around the Building Based on FLUENT
Authors: Huang Ying , Guo Pan
Published: September 2011

In the paper the gymnasium was used to discuss the selection principle of computational domain, boundary conditions, meshing, turbulence model, the location of referred pressure, solved parameters, and the criterion of convergence during numerical simulation of flow-field around the building based on FLUENT software. Compared the results of numerical simulation and wind tunnel test, it is feasible to calculate the wind-pressure on the building surface based on the theory of computational fluid dynamics.
Probe into Improved D-S Evidence Inference Algorithm Based on Weighted Method in Traffic Information Recognition
Authors: Lv Yue Jing , Xie Xu Fei , Song Xiang Bo , Zhou Xing Lin , Liu Ming
Published: September 2011

Data recognition is the most important problem of traffic information recognition to be resolved, evidence inference method for such uncertainty problems have a strong advantage, but it can’t deal with contradictions of evidence, that largely limits the practical application of it. This paper improves D-S evidence inference algorithm. The improved algorithm can effectively deal with contradictions of evidence, and obtain more satisfactory and reasonable fusion results. Finally, the algorithm is verified by traffic information simulation experiment.