bluuebunny/crossref_metadata_2025 huggingface dataset:
The Mechanical Performance Analysis of Steel Truss in the Fire and Damage Assessment after Fire
Authors: Zeng Jie , Yiang Qian , Zhao Bin , Liu Dong Dong
Published: June 2012

At present, based on the fire test results of single components, the design method of structure fire resistance performance is put forward. However, the cases for fire resistance research of space structure are not widely researched by scholars. Making use of finite element software to analyze structural fire resistance performance will be development trend of the research topic. In the paper, the author regards the truss structure in practical engineering as the research object. And by using thermal software (FDS), the environment temperature in every space position can be calculated to get steel’s fire temperature further. In the hot-force coupling module, structural mechanical behavior is analyzed after fire, and structural damaged degree is judged on the basis of the building identification level standard, which will be helpful to provide the repair opinion.
Application of the Comprehensive Geophysical Prospecting Techniques in Hidden Trouble Detection of Tailings Dam
Authors: Ju Hai Yan , Zhao Jiang Qian , Li Jian Hua , Xu Bin , Luo Chang Tai
Published: June 2012

Geophysical detecting methods are used widely in hidden trouble exploration of embankments and dams because of their portability and efficiency. The high-density resistivity method and the transient state surface wave method are used to investigate the mine tailings dam, combining the hidden trouble characteristic and feature of the mine tailings dam, the distribution range, the defect feature and the density of the dam material are found out by using the comprehensive methods. The techniques would be offering reference for controlling mine tailings dam seepage and stability and safety evaluation.
Travel Time Reliability for Rescue and Recovery after Disaster
Authors: Fang Shu Ming , Wakabayashi Hiroshi
Published: June 2012

Travel time reliability is very important for normal period and abnormal period especially disaster recovery. However, traditional indexes can not reflect travel time reliability in disaster areas. Thus a new travel time reliability index for disaster is proposed in this paper. The index proposed in this paper is different from usual indexes because of some special factors in disaster. Firstly, traffic capacity can be ignored because the traffic network would be controlled by transportation department. Secondly, the buffer time is difficult to estimate because traffic conditions are unknown after disaster, thus the traffic accessibility is used to build the new index for disaster recovery. Thirdly, distance of damaged roads is an important factor. The parameters of disaster scale or damage level are also discussed. However, the simulated results from this model are imperfect because some disaster areas are unpredictable and only the historical data can be use. Therefore, more factors and simulations should be considered to improve this model in the future.
Flood Damage to Rural Buildings Result from Foundation Scour and Scour Protection Strategy
Authors: Liu Yong Jun , Ma Xing Tao , Sun Yong Mei
Published: June 2012

In China, flooding is one of the most common and frequent natural disasters, which can cause life and property losses partly due to heavily damage and collapse of rural buildings. Hence, it is very important to conduct comprehensive study on flood damage to rural buildings. In this paper, the flood damage to rural builds is described and analyzed with emphasis on the foundation scour, which may result in whole building collapse, and scour protection strategy. Damages or collapse caused by foundation scour of rural building can be categorized into two main groups according to the location of rural a building. After summarizing existing scour protection strategies, a new technology is suggested. The contents presented in this paper may be useful references for further study on flood damage to rural building and scour protection engineering practices.
3D Building Modeling and Indoor Fire Event Representation in CityGML
Authors: Ren Sai Nan , Mao Jian Hua , Ye Ling , Liu Xue Feng
Published: June 2012

3-dimensional (3D) city model is increasingly popular in urban planning and disaster management. City Geographic Markup Language (CityGML) is an open data model and XML-based format for the representation and exchange of virtual 3D city model. This paper analyzed the modeling mechanism of 3D CityGML building model in LOD4 (Level of Detail) and proposed a method representing a fire event in CityGML. Our method included three operations：1) editing of building’s hierarchy and attributes information; 2) representing of semantic information of buildings surfaces, roof height and interior furniture; 3) representing of fire event by a vivid icon. With our method, 3D building model and indoor fire event can be both represented in CityGML, which is important to analyses urban emergency events.
Types of Hidden Safety Trouble for Existing Buildings in Shanghai and Solving Measures
Authors: Yan Xiao Li
Published: June 2012

In a city like Shanghai, where large sum of existing buildings with lots of existed hidden safety trouble exists, the need to identify and solve the safety problem of the existing Buildings to ensure the safety of the citizens’ lives and properties has become a vital task. This research concluded the several types of the hidden safety trouble for the existing Buildings including the main structure trouble, the fire trouble and some other trouble. Also the corresponding measures have been presented including the short term measure and long term measure. The results revealed that short and long term measures should be both used at the same time and the short term measures should transform to the long term measure gradually.
Study on the Techniques of Responders Dealing with Hazardouse Materials Accidents
Authors: Wang Kong Sen
Published: June 2012

This article analyzed the situation of hazardous materials accidents and pointed the basic techniques a fighter dealing with hazardous materials accidents should possess. These techniques include knowledge about characteristics of hazardous chemicals accidents, techniques of on-site control, decontamination, personal protection, and some basic techniques of medical treatment psychological stress treatment. These techniques are sure to be useful to responders to hazardous materials accidents.
Evaluation of Lining Damage Caused by Fire in Tunnels
Authors: An Yong Lin
Published: June 2012

For the sake of the quick judgment to the accurate lining damage degree and the research of its relationship to temperature scales and ablation times, residual compressive strength coefficient, burning rate of lining cross section and intact rate of lining cross section were firstly selected to be evaluative indexes. And then the damage degree of the lining was divided into 5 grades, that is, the higher the grade is, the more severe the lining damage is. The weight of the factors that affect damage degree of the lining concrete is calculated by AHP and the results’ accordance is tested to be good. Furthermore, the damage degree of the lining under several burning temperature scales and different burning times is obtained by grey comprehensive evaluation. The answer in this paper is accordance with that of paper 3,but it is more scientific and accurate.
Analysis of Failure Probability of a Potential Landslide in Northwest China
Authors: Hong Yong , Xu Qiang , He Ke Qiang
Published: June 2012

In this paper, the probability theory was applied in the stability analysis of a potential landslide, which is located at Lishan Mountain, China. By employing a cyclic loading ring shear apparatus, the geotechnical parameters in the stability analysis was measured under the testing conditions of simulating earthquake and heavy rainfall. Based on the calculation results, the failure probability as well as the stability of Lishan potential landslide was discussed. The results show that Lishan landslide is unstable under cyclic loading and become very dangerous to failure at the time of heavy rainfall.
Analysis on Influencing Factors of the Moment that Slider Begins to Slide for Sliding Base-Isolated System
Authors: Sun Min , Zhang Yu Guo , Niu Yong
Published: June 2012

The moment that isolation layer slider begins to slide has great effects on the whole system characteristics for sliding base-isolated system,and the moment plays a crucial role for the analysis of system energy and the confirmation of energy spectrum.Change rules of the moment that isolation layer slider begins to slide under the influence of the acting parameters and system’s design parameters,Taking two particle of plain sliding base-isolated system of building structure under harmonic excitation as the research object,are studied by using the numerical analysis method.The results show that the moment will be delayed if the friction coefficient of isolation layer or the natural vibration period of superstructure will be increased,and the moment will be advanced under the condition that the damping ratio of superstructure or external excitation which is exerted on structure being increased,while the mass ratio of isolation layer slider and superstructure has a very complex effect on the moment that isolation layer slider begins to slide,and the influence law relates to friction coefficient.
Research on Mobile Water Spray Device Reducing the Temperature of Metro Fire
Authors: Li Yu , Dong Le Xia
Published: June 2012

Reducing the temperature is one of the key technologies in the metro fire emergency rescue, so it is the basic work to be done. Rapid and effective cooling can reduce the casualties caused by the metro fire. Water spray can quickly absorb a lot of heat for its large surface area. Water spray can quickly cool down the temperature of the metro fire and reduce the casualties caused by high temperature. Mobile water spray device is used in emergency rescue of the metro fire in this paper. Research on the mobile water spray device can do contribution to reduce casualties caused by metro fire.
Sluice Risk Consequence’s Evaluation Based on Principal Component Analysis Method
Authors: Zheng Hao Yao , Zhuang De Li , Xu Luo Shi , Long Zhi Fei , Yang De Wei
Published: June 2012

Many sluices were damaged seriously after several decades’ use. In sluice safety level’s classification standard, there are quantitative indexes and qualitative indexes. Principal component analysis was used to evaluate the sluice. First the data were standardized, correlation matrix was got, and then confirmed principal components and weight, through this step principal components’ value and total value were received, finally sluice risk grades were determined and they could be ordered. The result is objective and reasonable, so we assess sluice easily.
Deformation and Failure of Guantianba Landslide, in the Reservoir of Xiangjiaba Hydropower Station
Authors: Zheng Hong Chun , Wei Jin Bing , Fu Wen Xi , Cui Yu Long
Published: June 2012

On 15 July, 2010, a landslide occurred at Guantianba in Hengjiang Town, Suijiang County, Yunnan Province, which is located on the right bank of Jinshangjiang River in Xiangjiaba Reservoir area; it destroyed several houses in this region, causing 8 families (about 30 residents) homeless, The slide is affected by the combined effects of the heavy downpour, sudden load at the rear of the landslide, excavation vibration and the overuse of plantation. With the first water storage of Xiangjiaba Reservoir in May this year, the landslide is very likely to slide again, so a detailed field geology survey has been done, some obvious deformation characteristics of the landslide were found. Based on field investigations and laboratory studies, this paper discusses the factors that affected slope stability of Guantianba and suggests that some monitoring and remedial measures should be taken to protect the wealth and life of residents. Through the analysis on the causes and stability evaluation of the Guantianba landslide, it provides certain reference value on the similar soil slope stability analysis in Xiangjiaba Reservoir area.
Research of Experiment for Slope under Ice Disaster
Authors: Huang Bin , Zheng Chang An , Chao Wan Li
Published: June 2012

By the indoor specimen and model experiment of soil slope, the real-time data of temperature and moisture content in various depths is obtained under certain slope rate, initial moisture content, temperature and boundary conditions. The result shows that, under extreme snow weather in South China, variation of the temperature field is closely related with rain infiltration, the temperature of the region which the rain infiltration reaches is reduces obviously.
Stability Analysis of Side Slopes under Disasters of Ice and Snow
Authors: Zheng Chang An , Chao Wan Li
Published: June 2012

According to the actual field survey, the degree-day model of snow-melting speed is discussed, seepage force of ground water is considered and the geometrical model for stability analysis on the freeze thawing of frozen-soil side slopes. Using the effective stress approach deduces the stability coefficient when soil slopes is instable due to freeze thawing caused by disasters of ice and snow, various factors affecting security coefficient of side slopes are discussed and the stability of side slopes under different depths of snow is solved.
The Experimental Study on Extinguishing Cooking Oil Fires by Water Mist
Authors: Chen Jian
Published: June 2012

Abstract. The effects of flow coefficients, working pressures and different spray distances on extinguishing cooking oil fires by water mist were studied by experiment. The results show that the fire suppression effectiveness is increased with the increase of flow coefficient and working pressure, spray distance also affects the fire extinguishment efficiency of water mist. Reasonable conditions and designing parameters for practical engineering application of water mist are suggested.
Research of Mechanical Influence of Initial Imperfections on Beam String Structure
Authors: Qi Yong Sheng , Liu Sheng Hua
Published: June 2012

Initial imperfections on beam string structure (BSS) include geometric imperfections and residual stresses, which negatively influence the mechanical properties of BSS. This paper analyzed the mechanical influences of initial imperfections on BSS by FEA, pointed out that initial imperfections do not remarkably influence the properties of BSS in stage of prestressing, but geometric imperfections obviously influence the displacement out of plane in stage of use, which should be controlled to improve the safety of BSS by installing enough lateral supports at the upper chords of BSS in construction.
Fracture Analysis of the Spiral Ribbed Pre-Stressed Steel Wire during Pre-Stretching
Authors: Sun Yi Qiang , Wu Lixin , Wang Zhifen , Li Jianhua , Zhang Youdeng
Published: June 2012

In order to analyze the case of the spiral ribbed pre-stressed steel wire failure during pre-stretching, OM, SEM and EPMA was used to do the inspection and analysis of the fracture sample. The result show that the crack propagation during pre-stretching of the wire bring on the fracture, which is cased by the net carbide and phosphorus segregation in the center of the raw material 82B rod in the drawing process.
Proposed Calculation Formula of Shear Connectors in UHPFRC-NSC Composite Structure
Authors: Guo Yi Hong , Wang Zhen Qing
Published: June 2012

Shear connectors are usually used to connect two different structural materials and to transfer longitudinal shear forces across the materials interface in composite structures. This paper presents an experimental study on the behavior of shear connectors in UHPFRC-NSC composite structure. A new experimental installation (The NSC block is laid on the supporting deck, and the higher UHPFRC block is cantilever, meanwhile the top side of the NSC block is constrained.) is applied. A modified formula that it is proposed to calculate the load carrying capacity of shear connector is given. The experimental results are in good agreement with the calculated results.
Stability Analysis of a Prey-Predator Model by Using Homotopy Analysis Method
Authors: Cao Hong Yan
Published: June 2012

A prey-predator model was considered. Using the methods of the modern nonlinear dynamics and homotopy analysis method (HAM), its stability was discussed. Firstly, we found the system’s positive equilibrium point and shifted it to zero point through transformation. Secondly, we analyzed the stability of the system at the equilibrium point. Lastly, we analyzed the transformed system by HAM. We support our analytical findings with numerical simulation.
Prediction of Longitudinal Compression Strength for a 2.5D-C/SiC Composite Based on Laminate Theory
Authors: Chang Yan Jun , Jiao Gui Qiong , Zhang Ke Shi
Published: June 2012

Based on the analysis of the woven structure, the compressive fracture process and strength of a 2.5D-C/SiC ceramic matrix composite were investigated by the classical laminate theory. The porous composite was regarded as a spatial layered structure, and the two classes of the warps and wefts in the 2.5D-C/SiC composite were treated as the corresponding layers. The strengths of the C/SiC bundle and C/SiC lamina were determined, and the compression strength for the composite was calculated by progressive fracture method of the layers and elastic degradation. The failure mechanisms and the angles of the compressive fracture surfaces coincided with the experimental result well. It was demonstrated that the strength predictive method of the classical laminate theory can be applied to the analysis of 2.5D-C/SiC composite.
Wavelet Multi-Scale Solution for Deflection of Thin Rectangular Plates under Temperature
Authors: Wang Yan Chang , Ren Ke Liang , Dong Yan , Wu Ming Guang
Published: June 2012

To consider the deformation of thin rectangular plate under temperature. In this paper, the wavelet multi-scale method was used to solve the thin plate governing differential equations with four different initial or boundary conditions. An operational matrix of integration based on the wavelet was established and the procedure for applying the matrix to solve the differential equations was formulated, and got the deflection of thin rectangular plates under temperature. The result provides a theoretical reference for solving thin rectangular plate deflection in thermal environment using multi-scale approach.
An ANSYS-Based Approach for Nonlinear Dynamic Stability Analysis
Authors: Lu Si Ping , Zeng Qing Yuan
Published: June 2012

Study on dynamic stability of structure is a hot subject in the fields of engineering mechanics, but its basic theory and analytical method still need to be further improved. This paper improved the current method for dynamic stability analysis called “dynamic eigenvalue method”, and the method for nonlinear dynamic stability analysis based on ANSYS platform is proposed. A long column under harmonic loads is taken as the research objective, dynamic eigenvalues affected by the load frequency, load amplitude and damping ratio are studied. Results show that, the increasing of load frequency or dynamic load amplitude will lead to the increase of maximum dynamic eigenvalue and decrease of minimum dynamic eigenvalue, which is not beneficial to dynamic stability of structure. The increasing of damping ratio will lead to the decrease of maximum dynamic eigenvalue and increase of minimum dynamic eigenvalue, this make the dynamic eigenvalue more stable. Therefore, the high damping is beneficial to dynamic stability of structure.
Experimental Study on Engineering Mechanical Properties of Beryllium
Authors: He Li Jun , Xu De Mei , Zhong Jing Ming , Hu Nan , Wang Zhan Hong , Sun Ben Shuang , Li Zhong , Zhang Jian Kang , Li Feng , Kang Hui Ling
Published: June 2012

For polycrystalline Beryllium (Be) specimens, data of yield strength, ultimate strength, elastic modulus, inelastic secant modulus elongation and grain size were obtained by using of material testing machine and metaloscope. It showed that: elastic modulus, inelastic secant modulus were basically independent with grain size; ultimate strength appeared at the end of tension process; relation between rate of yield strength to ultimate strength and elongation was found to be linear, but this rate had no clear correlation with grain size; relation between strength (yield, ultimate) and grain size was satisfied with Hall-Petch equation. Based on test data and analysis above, a bilinear model was given to simulate stress-strain constitutive behavior; an equation expressing relation between elongation and grain size was also derived.
The Optimized White Differential Equation of GM(1,1) Based on the Original Grey Differential Equation
Authors: Zhou Rui , Li Jun Jie , Chen Yao
Published: June 2012

This paper starting from the original grey differential equations, through finding the relationship between the raw data and the derivative of its , constructed a new white differential equation which equal to the original grey differential equation, at the same time, getting the new GM(1,1)model which closer to the changes of data. Through the modeling and prediction of the standard index series, this model not only adapts to low growth index series, but also adapts to high-growth index series, and the simulation accuracy and prediction accuracy are high.
Research on Hydrodynamic Performance of Front-Mounted Water Separation Propeller
Authors: Feng Feng , Chang Xin , Cheng Xiang Ru , Qi Xiang Yang
Published: June 2012

The Front-mounted Water Separation Propeller is a new-type energy saving propulsion device, on which it’s necessary to make research. A numerical simulation on the hydrodynamic performance of the Front-mounted Water Separation Propeller by RANS method was performed. The simple ship models with and without Front-mounted Water Separation Propeller were established and meshed by using hybrid grid. The drag performances of the ship model with and without Front-mounted Water Separation Propeller were performed separately by using Kω-SST turbulence model and VOF model. The method provided in this article is proved to be effective by make comparison between the simulation results and the model test results. The results show that the ship resistance can be reduced by using the Front-mounted Water Separation Propeller.
Numerical Study of Stress Intensity Factor in Notched Specimens Using Extended Finite Element Method
Authors: Chen Geng , Xu Tao , Xu Qiang , Bu Lin
Published: June 2012

The principle of the structure of displacement function, the establishment of governing equations, level set method were briefly outlined in this paper. Numerical simulations on three dimensional single edge notched specimens with different crack length in tension were performed using Abaqus software based on extended finite element method (XFEM), the stress intensity factor at static crack front was analyzed and the simulated results were in good agreement with analytical solutions. Numerical simulations in the present paper indicated that the extended finite element method is very suitable to deal with nonlinear fracture problems.
On an Extension of Hilbert Inequality
Authors: Sun Bao Ju
Published: June 2012

In this paper, by using Hadamard inequality and Cauchy inequality, an extension of Hilbert inequality is established.
Analysis of Stress Distribution of Externally Pre-Stressed Beams under Transverse Loads
Authors: Zhang Peng , Shen Dan , Li Shi Rong
Published: June 2012

The size, the position and the arrangement of external restraint will significantly affect the mechanical properties of the structures with the external restraint. Based on classical beam theory, the stress distribution of a simply supported beam with externally reinforcing steel bars under transverse loads is analyzed in this presentation. By assuming that the stresses in both the beam and the external constrains are less than their proportional limits, an analytical formulation of normal stress in the cross section of the beam was derived by considering two cases that the externally reinforcing steel bars are pre-stressed and are not pre-stressed. Influences of the parameters of the stiffness and the position of the externally reinforcing steel bars on the stress of the beam are discussed.
Influence of Axial Load Level on Performance of Resist Impact on Tubular T-Joint
Authors: Qu Hui
Published: June 2012

Axial load loading on the chord can deteriorate impact performance of tubular T-joint subjected to impact loading on the brace. FEA method was used in this paper to investigate the influence of different axial load level under varied impact energy. The analysis result showed that with the increasing of axial load level, the impact force decreased, and under the same axial load level, the impact force increased with the increasing of impact energy. The failure model under different axial load is change from failure around the juncture of chord and brace to at the end of chord.
Different Techniques Comparison in Biomechanical Analysis of Ping Pong
Authors: Mao Bi Jian
Published: June 2012

Ping Pong has been considered as one of the most popular sports in the world. Fast break and curving ball technology is this game’s core technology, it will be very important to deeply understand this through biomechanical study. In this research, we based on fast break and curving ball features of kinematic to reveal the table tennis forehand techniques. High speed motion analysis was recorded from eight male subjects. The action was divided into three major phases: back swing, attack and follow through. At the end of back swing stage, break and curl technologies, the speed parameter shows some differences. While the fastest speed in ball contact frame, the speed of curling ball was significantly higher than the fast break. Further study could be carried out in detailing analysis at sub-stage of the action for integral considering.
Correct Wavelet-Based Multilevel Numerical Method of Local Solution of Boundary Problems of Structural Analysis
Authors: Akimov Pavel A. , Mozgaleva Marina L.
Published: June 2012

The distinctive paper is devoted to correct wavelet-based multilevel numerical method of local solution of boundary problems of structural analysis. Operational and variational formulations of the problem (particularly with the use of wavelet basis) are presented. Computer-oriented algorithms of fast direct and inverse discrete Haar transforms are described. Due to special algorithms of averaging within multigrid approach, reduction of the problem is provided.
Experimental Research on Mechanical Properties of Fundamental Frame Units in Multi-Ribbed Composite Wallboard
Authors: Yue Ya Feng , Zhao Dong
Published: June 2012

The fundamental frame units were taken from the multi-ribbed composite wallboard. 1/2 scale model specimens including bare frame (FD Series) and infilled frame (IFD Series) were loaded in the diagonal direction. By changing the section size of a frame beam and column, the mechanical properties of multi-frames under vertical and horizontal loads were studied. Through comparing and analyses, contributions and interaction between frame and infilled block were investigated. The results show that the frame section stiffness influences the mechanical properties remarkably and the interaction between frame and infill is significant.
Study on Bending-Torsional Coupling Vibration of Intermediate Axis
Authors: Yao Xue Shi , Zheng Chun Long
Published: June 2012

In order to find the cause of the cracked intermediate axis in a transmission,the characteristic of the bending vibration，torsional vibration and bending-torsional coupling vibration were studied through the analysis of the nature frequency and modal shape based on prestress.The results show that the fatigue fracture of the axis is mainly due to the resonant torsional frequency and bending-torsional coupling vibration and It is basically demonstrated by experiment.It has been found that the fundamental frequency is increase with the increase in spin axis velocity because of the centrifugal load i.e.prestress.The effets can be accounted for by an adjustment of the stiffness,and the dynamic equations are derived.In the end,it is made the optimized design on the axis,the low inherent frequencies are optimized in order to avoid resonance.The problem of the cracked intermediate axis has been solved.
Hybrid Trefftz Finite Element Analysis of Orthotropic Potential Problem
Authors: Wang Ke Yong , Li Pei Chao
Published: June 2012

This investigation provides a hybrid Trefftz finite element approach for analysing orthotropic potential problem. For verification purpose, two examples are numerically investigated.
Constitutive Theory of Elastoplastic Coupled with Damage of Anisotropic Concrete
Authors: Xiao Jiang Qing , Zhang Qing , Ding Dao Hong
Published: June 2012

A coupled elastoplastic damage model is proposed for the description of anisotropic concrete under compression-dominated stresses. The model is applied to typical concrete in various loading conditions. Damage evolution law and plastic damage coupling are described by using the framework of irreversible thermodynamics.
Capture of 2-D Crack Growth Path by the Polygonal Numerical Manifold Method
Authors: Zhang Hui Hua
Published: June 2012

Due to the independence of physical domain and the mathematical cover system, the numerical manifold method (NMM) can efficiently simulate crack propagation without remeshing. At the same time, the polygonal elements are also very attractive due to their great flexibility in meshing and high efficiency in materials modeling. In the present paper, the NMM is applied to solve 2-D crack propagation problems on polygonal elements. Our numerical results show that the proposed method can well capture the crack growth trajectory compared with the reference solution
Element Free Galerkin Formulation of Composite Beams with Longitudinal and Transverse Partial Interactions
Authors: Ahmad Dzulkarnain , Mohd Yassin Airil Yasreen , Kueh Ahmad
Published: June 2012

Partial interaction between two different materials of composite beam is consequent from longitudinal slip and transverse uplift effects at interfacial surface. The behaviour has yielded higher order differential equation as compared to beam that interacts fully. In this paper, a meshless approach for the analysis of composite beam with partial interaction by Element Free Galerkin (EFG) method is formulated and investigated. Discretized solely by nodes, the Moving Least Square (MLS) method is adopted for the EFG shape functions formulation and the variational approach is chosen in developing its Galerkin weak form. The weak form essential boundary conditions are enforced by Lagrange multiplier, where comparable results are obtained between developed EFG code and established analytical solutions. In addition, influence of various weight functions on shape function smoothness of EFG code is explored.
Comparisons of AR Model and Wavelet Analysis Model
Authors: Zhang Wen Fu , Xie Dan , Ji Jing , Liu Ying Chun
Published: June 2012

Comparisons of AR model and wavelet analysis model are presented. Similarities and differences between the two models are firstly indicated with respect to its mathematic expression and physical meaning. Furthermore, range of frequency domain characterized by samples, length of samples and algorithms of models, accuracy and efficiency are also discussed. This can be used as reference to choose model reasonably in the application of wind field simulation.
Dynamic Mechanical Behavior of Concrete under Uniaxial Stress
Authors: Li Ting Xiu , Zhang Yan , Jiang Lin Hua
Published: June 2012

According to existing experimental results, a systematic analysis of stress–strain relation of concrete under uniaxial dynamic loading is carried out. Research shows that the dynamic loading rate has a direct effect on concrete strength and elastic parameters. Finally, a constitutive law is proposed in this paper.
Analysis of Slab and Beam’s Moment Influenced by Stiffness Ratio
Authors: Chen Hai Xia
Published: June 2012

In this paper ,taking industrial factory building , the size of 33 * 19.8 m2 for example, analyzes Integral reinforced concrete floor system under the loads by Finite element analysis software ANSYS. In the calculation process, beam element is beam4, slab element is shell63, Changing the line stiffness ratio of beam and slab, main beam and secondary beam, researches of moment on the main beam and the secondary beam by means of line stiffness ratio. It is showed that , when the value of line stiffness ratio is more than 10, mid-span moment is fewer obviously with the Increasing K ; when the value of line stiffness ratio is between 2 and 5, mid-span moment is fewer, too; when the value of line stiffness ratio is shorter than 2, mid-span moment does almost not changed.
Shear Calculation of the Interface in SRHSHPC Beam
Authors: Zheng Shan Suo , Zhou Ning , Tao Qing Lin , Wang Fan
Published: June 2012

Experiment study and theoretical analysis show that when the interfacial bond property cannot guarantee the cooperative work of structural steel with concrete, SRHSHPC (steel reinforced high-strength and high-performance concrete) beam will generate in splitting failure of bending, resulting in SRHSHPC beam flexural capacity does not work. According to the experiments, and adopting existed theory and domestic as well as foreign codes for composite beam, the failure modes, and shear calculation of SRHSHPC beam are analyzed in this paper.
A Method of Determing Dynamic Stability Critical Length of Construction Member
Authors: Sun Qiang , Guan Cong Cong
Published: June 2012

Based on the theory of elastic stability of structure,the calculating formula for dynamic stability critical length of construction member being in lateral resonance under the axial dynamic load is derived in this paper. The influence of different parameters, such as end conditions; rod size; damp force and excitation frequency, natural frequency, rod material, on dynamic stability critical length of rod is analyzed. The paper puts forward some related measures for reducing vibration of rod, and may provide reference values for the design and analysis of engineering.
Experimental Study on Basic Mechanical Properties of Recycled Concrete Made of Brick and Tile
Authors: Xie Ling Jun , Zhai Ai Liang , Wang Chun He , Ji Chang Liang , Chen Shu Jian
Published: June 2012

By experimental, study on the elastic modulus including the failure modes of Recycled Concrete made of Brick and Tile with the splitting tensile strength and the compressive strength, And the relational formula between the splitting tensile strength and the compressive strength was summarized from the results.
Fine Stress Analysis and Strength Prediction of Joints in Axial Shear
Authors: Liu Jie Min , Hong Yuan
Published: June 2012

A fine analysis model for joints in axial shear is given on the base of observation of experiment. Failure of the pin connecting adherends is due to combined deformation of pressure-shear. Both critical region of the pin and the stress state in critical rejoin are evaluated. Ultimate load Fu of the joint in axial shear is evaluated with strength criteria. The following conclusions are obtained. (1) Fu is related to ratio of adherend thickness t to length L. Fu increases with t when t/L is less than 0.1 and hold as a constant when t/L is greater than 0.2; (2) Fu can well be predicted by bi-shear theory or maximum tension strain criterion, but not by Tresca and Mises criteria; (3) Although traditional approximate calculation method of connections is widely used, related experiment must be done for obtaining ultimate shearing stress. Thus, the fine analysis method presented in this paper is useful for stress analysis and strength evaluation of connections.
Residual Stress Research of Cold-Formed Thin-Wall Steel Members Using the Finite Element Method
Authors: Liu Hua Chen
Published: June 2012

This paper analyzes the results of experience and rules of distribution of the cold – formed residual stress. Distribution models of residual stress in cold-formed thin-wall steel that are close to the real condition and initial stress files of ANSYS which can describe the magnitude and distribution of the residual stress are established. This method can be applicable to simulate different distribution of the residual stress. Through importing the files into the stability analysis of ANSYS, ultimate load in the effect of residual stress can be gained. The stability coefficient of cold-formed thin-wall crimping angle steel under influence of the initial bending of 1/750 is studied, comparing the result curve with the one in GB50018-2002, it is proved that the curve is reasonable and the stability coefficient of the code should be suitable to improve.
Uncertain Out-of-Plane Behavior of Composite Plates due to Spatially Random Material Properties
Authors: Noh Hyuk Chun , Seo Dong Won
Published: June 2012

This paper deals with the evaluation of response variability of composite plates due to randomness in the Poisson’s ratio in particular for the out-of-plane behavior. To this end, we adopt the weighted integral stochastic finite element (SFE) scheme and derive a SFE formulation employing Taylor’s expansion on the random Poisson’s ratio and displacement vector as well. In case of composite plates, the stiffness of the structure is affected by the stacking scheme of individual layers. This means that even the plates subjected only to in-plane loading can show out-of-plane behavior. In order to investigate this phenomenon, we chose two example plates with symmetric and asymmetric stacking scheme. A detailed explanation on the results is addressed for the plates under consideration.
Brief Introduction of Residual Thrust Method and its Improvement
Authors: Song Zhi Fei , Xu Xiu Ming
Published: June 2012

Residual thrust method is an original method for slope stability analysis in China. It is widely used in industrial and civil construction as well as the ministry of railways of China, especially in the analysis and treatment of slope stability of the landslide. For the existing remained slip force method, this paper briefly describes how to use residual thrust method to analyse the stability of side slope, and it gives a brief account of residual thrust method formula and its solution. Moreover, this paper outlines the applicability of the residual thrust method and still existing problems and some corresponding improvement methods those have been successfully applied to practical project.
Scattering of SH Wave on Periodic Cracks in an Infinite Plane of Piezoelectric/Piezomagnic Composite Materials
Authors: Shi Wei , Ma Li Xia
Published: June 2012

In this paper, the scattering problems of SH waves on periodic cracks in an infinite of piezoelectric/piezomagnic composite materials bonded to an infinite of homogeneous piezoelectric materials is investigated, the Fourier transform techniques are used to reduce the problem to the solution of Hilbert singular integral equation, the latter is solved by Lobotto-Chebyshev and Gauss integral equation, at last, numerical results showed the effect of the frequency of wave, sizes and so on upon the normalized stress intensity factor.
The Research Status and Prospect of Passive Energy Dissipation Technology in Fields of Structural Engineering
Authors: Chen Min , He Guo Jing
Published: June 2012

This paper generalizes the research status of passive energy dissipation technology in the field of Structural Engineering. Many achievements has been gotten since its emergence, including the manufacture of dampers, the experimental research and control effect analysis for energy dissipation systems, as well as the studies on its optimal design theory, which plays an important role in protecting people's life safety. However, the current design idea mainly focuses on the security, thus the energy dissipation structures will still suffer great economic losses even in moderate earthquakes. As a result, it is quite necessary to introduce the performance-based seismic design idea to study the design theory for passive energy dissipation. This paper has detailed three key problems in performance-based design of passive energy dissipation and put forward some strategy. Finally, it marks out that to study the performance-based design theory in passive energy dissipation system is of great significance in promoting the sustainable development of society.
Simplified Method for Elastic Distortional Buckling Stress of Cold-Formed Thin-Wall Steel Members
Authors: Zhao Yang , Yan Wei Ming , Yu Cheng
Published: June 2012

For the distortional buckling of cold-formed thin-wall steel members, the Direct Strength Method (DSM) is a recently adopted design approach by foreign standard, and Chinese professional standard Technical specification for low-rise cold-formed thin-wall steel buildings present the calculation formulas based on the Effective Area Method (EAM) .The key of both methods is the elastic distortional buckling stress .At present, the calculation methods about it are over conservative .Compare the calculation results of method in AISI S100with the one calculated by software CUFSM ,for C and Z sections in bending and axial compression loading respectively in the North American Specifications for Cold-Formed Steel Structural Members (AISI S100). This paper presents revised simplified methods for calculating the elastic distortional buckling stress. The new methods yield more accurate results but similar computation cost compared to the existing methods.
Modal Analysis of Tensioned Membrane Structure of Umbrella-Shaped
Authors: Zheng Jian , Huang Cheng Wei , Zhang Yao
Published: June 2012

The tensioned membrane structure is a typical flexible architecture and is sensitive on the wind loads . We used software ANSYS to do modal analysis of the umbrella-shaped membrane structure and analyzed the natural vibration characteristics. We focused on the effect of design parameters on structural modal. The results show that the natural frequency of umbrella-shaped membrane structure mainly depends on membrane prestress and membrane tension stiffness.
About One Way of Optimization of the Thick-Walled Shells
Authors: Andreev Vladimir I.
Published: June 2012

Abstract. The paper discusses a method of optimization of thick-walled shells on the basis of the solution of inverse problems theory of elasticity of inhomogeneous bodies. There are discussed the terms of equal-stress and equal-strength structures. The notion of efficiency ratio of equal-strength shell as the ratio of limit loads in heterogeneous and homogeneous shells. Constructed the model of a multilayer shell of polymer concrete for which the coefficient of efficiency is close to 2.
Research on Auxiliary Pile Group’s Impact to Foundation Pit’s Horizontal Displacement and Analysis on Pile Group’s Equivalent
Authors: Xu Bang Shu , Liu Ri Cheng , Gong Ming , Zeng Zhong Yi
Published: June 2012

Auxiliary pile group closed to foundation pit can improve the stiffness of soil mass and decrease foundation pit’s transformation effectively to guarantee foundation pit’s stability. Drucker-Prager model is used and matched with Mohr-Coulomb model’s circumcircle, which can solve the problems of uncertain viscoplasticity strain rate and discontinuous in cones vertex, compared with Mohr-Coulomb model. Also, numerical simulation software FLAC3D is applied to help analyze foundation pit’s horizontal displacement caused by auxiliary pile group, and sensitivity analysis is done about pile spacing and stiffness. The calculation results compared with monitoring data show that Drucker-Prager model is appropriate to simulate foundation pit. Stiffness of soil mass can be improved obviously by auxiliary pile group. Auxiliary pile group of CFG mainly reduce foundation pit’s upper horizontal displacement while bored piles mainly cut down deep layer’s horizontal displacement of soil mass. The results can provide references to both design and management of foundation pit.
Experimental Study of Defects in Cast-In-Situ Bored Piles and its Application for Superdeep Defect Treatment
Authors: Wang Zhong Wen
Published: June 2012

Abstract. After the finishing of piles, it was found that concrete defects at 63.0m-67.0m at the No.1 Bored pile in the North Channel Bridge of Hangzhou Bay Bridge B13 pier, which is at a diameter of 250cm with length of 96m. Aiming to successful treatment for this kind of defects, the present study proposed the pressurized concrete injection treatment techniques for superdeep defects in bored piles. In the paper, the experiment was carried out in comparing various mixed proportions of grouting, and the relationship analyzed between compressive strength and sound velocity for the treatment process. From these data an empirical equation between sound velocity and strength was determined, and the curve established. Following the superdeep pressurized injection of concrete treatment technique, the bored pile was successfully treated for the defects, ensuring the pile foundation achieving design criteria.
Experimental Research on Frame Structure of Light Steel Temporary Buildings
Authors: Cai Xue Feng , Ma Yong Chao , Zhang Zheng , Zhou Ji Zhong , Xue Lei
Published: June 2012

Static tests were conducted on frame structure of light steel temporary buildings under wind load. The mechanical behavior and the deformation performance of the structure were investigated. A kind of new system of load distribution beams was applied, which imposed the horizontal loads to load points of columns and simulated the uniformly distributed wind load. The load-displacement curves and the strains of the columns were obtained. The performances of the light steel temporary building are summarized and discussed.
The Second Order Elastic-Plastic Analysis of Plane Steel Frame Structures with Semi-Rigid Connections
Authors: Hu Xi Bing , Zhou Peng
Published: June 2012

Considering the nonlinear behaviors of semi-rigid connections, a new calculation model for the second order elastic-plastic analysis of plane steel structures is presented by replacing the general element with a new one, which has two rotational springs at its ends. Based on the theory of beam-to-column, the element’s rotation-displacement equations are revised, and the second order elastic-plastic rigidity matrix of this kind of structure is derived in this paper. And the second order elastic-plastic program of this kind of structure is worked out. Two steel frames are calculated with this program. The results of calculations show that this model is reliable and fit to the analysis of all plane steel structures.
The Analysis and Application Research on the Space Work of Portal Frame
Authors: Zhang Xiao Wei , Xiong Zhong Ming , Su Ni Na
Published: June 2012

In this paper, the application of finite element software with the actual structure of the field static load test for the engineering background, describes the space effect of portal frame under vertical load. Established a gymnasium mode of portal frame through the finite element software, quantitative analysis the space effect under the vertical load, and studied the spatial interaction of longitudinal anti-lateral component to the overall structure, and compared with the results of the field static load test. The calculation results show that, the reduction of spatial effect to internal forces under the vertical load should be considered in design. It is important that a reasonable increase in rigid tie and support can enhance the space effect of the whole portal frame.