bluuebunny/crossref_metadata_2025 huggingface dataset:
The Research on the Stability of the Foundation and Grouting Treatment Effect under the Process of Surface Structures in Old Mined-Out Areas
Authors: Li Ke , Li Tong , Wang Dong Li
Published: December 2010

Firstly, it simulates different depth at nanmaquan and civil mines respectively with the software of MIDAS to carry out in phases; secondly, it discusses the rule of vertical settlement surrounding rock and cover rock in the mined-out areas; lastly, it analyzes furtherly the rules of changes with the method of adding different load in order to research the stability of the foundation under load in the old mined-out areas. The filling grouting of falling belt and cracks belt have been explored and analyzed on the basis of a series of different methods such as total filling grouting, part decreasing stride, separating rock and board, and independent rooting, and so on. Afterwards, it applies XBHV-10-foot steel settlement instruments to measure on the scene and analyze the effect. Minded-out areas reached the desired treatment effect.
A Method of Strengthening Concrete Suspension Bridges
Authors: Ye Yi , Pan Shen Shan , Zhang Zhe
Published: December 2010

The method of strengthening the existing reinforced concrete suspension bridges by changing suspension system into cable – stayed- suspension system is presented in this paper. Based on a typical bridge, the analysis of the static behavior of the bridge before and after the strengthening is preformed. The results show that the bending moment of the girder is reduced obviously and the capacity of carrying load is greatly improved. The original cable system is fully utilized and can meet force requirement. It has certain theory significance and practical engineering value to the similar bridge’s strengthening.
Debonding Prediction of RC Beam Flexurally Strengthened with Prestressed FPR
Authors: Xie Jian He , Zhao Jin Xia , Huang Pei Yan
Published: December 2010

Intermediate crack debonding is a common failure mode of reinforced concrete (RC) beam flexurally strengthened with externally bonded prestressed fiber reinforced polymer (FRP). This study analyzes the effects of flexural cracks and interface softening behavior on the interface shear stress of RC beam strengthened with prestressed FRP under three-point bending loads, and presents an analytical solution for the FRP axial force at the flexural crack section of the strengthened beam. By regarding the interface fracture energy as the debonding criterion, a new theoretical model to predict the debonding load-carrying capacity of RC beam strengthened with prestressed FRP is proposed.
An Experimental Study on Flexural Behavior of Reinforced Concrete Beams Strengthened with High-Performance Ferrocement
Authors: Liao Hua Ping , Fang Shi Sheng
Published: December 2010

Three reinforced concrete (RC) beams strengthened by high-performance ferrocement and two control specimens without strengthened are investigated when RC beams have low compressive strength. Flexural behaviors of strengthened RC beams with high-performance ferrocement are evaluated based on comparative analysis with RC beams. The strengthening results of steel meshes with U-shape (i.e. ferrocements are put onto the tension face and two profile faces) are analyzed. The flexural capacity, deflection and crack width of RC flexural beams are measured, and then comparative analysis is carried out for deformation performance and law of crack development. The test results show that ferrocement contributes greatly to increase the flexural capacity and raise crack-resisting capacity. The experimental results can provide a theoretical reference for actual engineering designs.
Experimental Investigation on the Anchorage Mechanics of Anchorage Cable of the late Model with the Pressure Uniform
Authors: Lei Wen Jie , Xu Guo Xin
Published: December 2010

A series of mechanical properties tests on the supporting body of anchorage cable of late model were carried out, with the forms of the supporting body structure in the anchorage segment of pressure-type anchorage cable, and the strength of surrounding rock in the anchorage segment varied. Those were aimed to study the transfer mechanism of acting forces between the supporting body in the anchorage segment of anchorage cable with pressure uniform and the bearing mortar. Those could be used to gain the distribution and magnitude of axial stress and shear stress of the supporting body, as well as the resisting shear performance of the bearing mortar. The reasonable structure of supporting body of anchorage cable with the pressure uniform could be determined by the tests results. The research showed that the axial stress is distributed with uniform linear form along the steel pipe radius of supporting body with the pressure uniform. The rib—like structure on the surface of the supporting body could improve the resisting shear properties of the bearing mortar and raise the anchorage force 0f the anchorage cable with the pressure uniform. The tests results could be used to optimize the length of the anchorage segment.
Evaluation and Performance of Repair Materials for Rehabilitation of Concrete Structures
Authors: Khan Mohammad Iqbal , Almusallam Tarek H. , Almosa Abdulaziz a. , Alsayed Saleh H. , Al Salloum Yousef A.
Published: December 2010

The most common form of rehabilitation for a deteriorated structure is to remove the deteriorated concrete and replace it with a new material, thus increasing the design life of the structure. Good adhesion of a repair material to concrete is of vital importance in the application and performance of concrete repairs. A major factor that influences the durability of the repair is the bond strength between the new material and the substrate. In this investigation, the most common repair materials, produced by international reputed manufactures, available in the local market were selected from cementitious repair mortars and cementitious polymer modified mortars. The performance of these materials were evaluated in terms of compressive strength, tensile strength, bond strength in tension and bond strength in modulus of rupture.
Dynamical Characteristics Research on Cable Dome
Authors: Chen Lian Meng , Dong Shi Lin
Published: December 2010

The vibration frequency and vibration mode of a Geiger dome are studied first in this paper. Then the influence of the prestress and the externalload to the frequency and the way to change the vibration modes are discussed. At last, the response to the earthquake and the comparison of the aseismatic behavior between before and after adding the stability cables are studied. The results of the paper are believed to provide a meaning help in the preliminary design of cable domes.
Numerical Simulation of Wind Pressure Distribution on Structure Roofs with Suspension Solar Panels
Authors: Zhou Ying , Zhang Qi Lin
Published: December 2010

This paper presents the results of full-scale numerical wind tunnel tests of wind pressure on structure roofs with suspension solar panels. Solar roof project is popularized in this century. Solar panels are suspended above the structure roof. So the wind load effect on the structure roof is varied. The wind tunnel experiments are often expensive. A 3D model is introduced and solved using ADINA. The wind pressure distribution coefficients are calculated.
Study on Disk Spring Two-Storey Rolling Isolator
Authors: Sui Jie Ying , Liu Weng Feng , Zhang Yang Yang
Published: December 2010

In this paper, a new type of disk spring two-storey rolling seismic isolator was developed. The two-storey rolling isolator isolates horizontal earthquake with metallic dampers to restore to normal position, limit displacement and dissipate energy. The disk spring isolates vertical earthquake. Adopt MATLAB to build the shear model, and contrasts the earthquake response between the base-isolated structure and the unbase-isolated structure.
An Experimental Study on Mechanical Behavior of Superelastic NiTi Shape Memory Alloy Bar Subjected to Torsion
Authors: Zhou Hai Jun , Huang Hong Hong , Zhang Hua
Published: December 2010

An experimental study on mechanical behavior of superelastic NiTi shape memory alloy (SMA) bar subjected to torsion was made. The SMA specimen was in round bar shape, material phase was austenite and stress mode was torsion. The test was carried out by applying repeated cyclic uniform torsional load. Strain rate, strain amplitude and number of cycles were considered as test parameters. The test was described and analyzed in terms of three fundamental mechanical quantities: secant stiffness, energy loss per unit weight and equivalent damping. The test results show that SMA bar subjected to torsion, have great potential for application in seismic devices due to their considerable superelasticity and stable cyclic behaviors.
Analysis of Earthquake Response on Isolated Building with Limiting Displacement Protective Devices
Authors: Liu Jin Hui , Ding Wan Tao
Published: December 2010

Based on isolation theory, time-history analysis on isolation system with limiting displacement protective devices was studied by Fortran program. Isolation effect of non-isolated structure, isolated structure and limit isolated structure were analyzed. Adhesion phenomenon of algorithm is solved by subdividing time steps during program analysis. And it gets good effect. According to comparing with isolation effect of different isolated structure, the result that isolation effect of isolated structure and limit isolated structure is obvious is reward; and limit isolated structure can isolation and prevent large displacement of isolation layers to avoid structure failure under rare earthquake condition. So limit isolated structure plays a double protection for structure.
The Vibration Affects the Adjacent Sensitive Building and its Control Countermeasures
Authors: Hu Jiang Chun , Bian Ya Dong , Wang Hong Fang
Published: December 2010

In order to forecast the vibration affecting the nearby buildings, the analysis methods that the adjacent buildings are influenced due to the construction vibration are researched in the paper. The highway vibration affecting the near chimney is taken as an example. The curve of characteristics seismic coefficient is used as response spectrum. The max values of ground velocity and acceleration come from the vibration roller parameters. The effect range of vibratory roller and the distance of the chimney to the highway are used to analyze the vibration effect and control countermeasures by geotechnical engineering software. Results show that the vibration main effect is foundation soil not the chimney, and we can take reducing construction vibration, establishing isolation measures or strengthening building to ensure safety of the buildings.
Numerical Simulation on Wave Forces Acting on Superstructure of Twin-Decks Bridge
Authors: Zhang Xian Tang , Chen Ai Rong , Wang Chen , Gao Kang Ning
Published: December 2010

Based on practice engineering and model test, and considering different bridge elevation, elevation of sea bed, and the different wave factor, the author uses the 2D numerical wave tank based on the software ANSYS FLUENT which is established by ourselves to carry on the numerical simulation to various models, and compares with the corresponding experimental values. The author verified that all the forces are descending with the increase of bridge elevation. The most dangerous bridge elevation under wave action exists in bridge design, so it should be avoided. The optimum elevation of the bridge deck is recommended +5.5 m, and some advices on practice design engineering are presented.
Nonlinear Seismic Behaviors of Girder Bridge with Single-Column Pier
Authors: Qiu Wen Liang , Zhou Le , Zhang Yu
Published: December 2010

Based on the shortcomings of the continuous girder bridge with single column pier, two-span T-shape rigid-frame bridges with single integral pier and two separated piers are put forward in this paper. Using time-history analysis and considering the material nonlinearity of reinforced concrete of the pier, the nonlinear seismic responses of the three bridge structures subjected to horizontal seismic wave are analyzed. The results show that, compared with continuous girder bridge, the shear forces of the two types of T-shape rigid-frame bridge are bigger, the moments of the T-shape rigid-frame bridges is smaller, and rotation angle of plastic hinge of T-shape rigid-frame bridge is much smaller. The energy dissipation and the anti-seismic capacities of T-shape rigid-frame bridges are better than continuous girder bridge under the condition that the shear resistance capacity of pier is secure.
Parametric Study of Longitudinal Seismic Pounding Response for RC Girder Bridge Based on Kelvin Impact Model
Authors: Jiang Hui , Xiong Zhi Yang , Zhu Xi , Yang Qing Shan
Published: December 2010

The pounding between adjacent segments of bridge has significant influences on its seismic performance, which is a complex nonlinear phenomenon involving many parameters. Based on Kelvin impact model, a simple-supported girder bridge was introduced to discuss the effects of impact stiffness and initial gap between joints. With dynamic analysis, it can be drawn the reasonable range for impact stiffness ratio and initial gap at expansion joint are respectively 0.05~0.2 and 0.04m~0.05m, which make the earthquake response of bridge reach a good balance.
A Novel Concept for Describing the Wind Sensitivity of Structures
Authors: Zhang Jian Sheng , Wu Yue , Wu Di
Published: December 2010

A number of methods for assessing wind-induced vibration of structures are available ranging from simplified procedure using quasi-static methods to the detailed procedure using statistical methods. The appropriate procedure should be selected in accordance with wind sensitivity of structures. However, it still remains unresolved concerning how to provide a universal criterion with physically meaningful and convenient for the concept of the wind sensitivity until now. In order to solve the previous problem of how to distinguish between those structures for which the wind effects can be treated by simplified procedure, and those for which the wind effects must be treated by detailed procedure, a concept of sensitivity for wind-resistance is presented in this paper. The essential idea of this theory is to provide a general expression of wind sensitivity of structures by synthesizing three factors between wind load and the structure, including the size-effect factor, frequency-effect factor and mode-effect factor, which are based on the analytical derivation and take duly into account the influence of all the significant parameters for the response. Based on that, two case studies of cantilevered roof and single-layer reticulated shell structures under wind actions are demonstrated as illustrative examples.
Seismic Performance of Reinforced Concrete Pier with Inside Concrete Filled Steel Tube
Authors: Qiu Wen Liang , Jiang Meng , Zhou Le
Published: December 2010

A reinforced concrete column with inside concrete filled steel tube (RC-CFT) has many advantages over reinforced concrete (RC) column, such as higher compression, shear and moment capacity, higher ductility. So this kind of composite column has been used as frame column in buildings. In this paper, the composite columns are used as piers of a continuous bridge to improve the seismic performance. Using nonlinear time-history analysis method and fiber element model, considering elasto-plastic nonlinearity, the nonlinear relationships between lateral load and horizontal displacement of RC-CFT pier and RC pier are calculated, and the seismic behaviors of continuous bridges with the two types of piers are analyzed. Based on the comparison of the results, it is found that the ductility of RC-CFT pier is much larger than RC pier. Under the same intensity earthquakes, the damage of RC-CFT pier is less than the RC pier, and RC-CFT pier is more safe and easy to be repaired after earthquake.
PFC Simulation on Shaking Table Concrete-Faced Rockfill Dam Model Test
Authors: Yang Gui , Chen Yu Min , Gao De Qing
Published: December 2010

The shape and seismic behavior of concrete-faced rockfill dams under designed seismic load are usually studied by shaking table test, dynamic centrifuge model test and finite element dynamic analysis. Particle flow code (PFC) simulation is analyzed based on the shaking table test, which overcomes the deficiency of macro-continuity assumption in continuum mechanics and can demonstrate the failure characters of dam under dynamic loading action intuitively and vividly. The law obtained from numerical simulation is almost consistent with the one obtained from the shaking table test. The simulation results indicate that the failure characters of concrete-faced rockfill dam are particle sliding on the dam surface and that the concrete face can efficiently reduce the slide displacement and dam top settlement.
Research on Additional Internal Force and Deformation of the Portal Frame Construction Caused by Surface Deformation
Authors: Xia Jun Wu , Bu Ling Quan , Hou Zhi Chao , Liu Xiao Wei
Published: December 2010

This article focuses on the construction of portal frame without crane. The dynamic variational laws of the additional internal force and displacement of the portal frame construction under the elongation, compression, tilt (uneven settlement), positive curvature and negative curvature deformation of ground are calculated by numerical simulation method, using the structural finite element analysis software – ANSYS. We find that the swing column will alter the distribution of the frame construction additional internal force with the surface deformation; and it can effectively restrict additional deformation of the beam, which is caused by the surface deformation. The swing column increased the ability of resist surface deformation of frame construction with compression and uneven settlement deformation; but it reduced the ability of resist surface deformation of frame construction with elongation deformation. Moreover it indicates that the reciprocity between base and foundation will alter the distribution of the frame construction additional internal force with the surface deformation.
Seismic Response of the Asymmetric Structure Isolated by the Friction Sliding Bearings
Authors: Wang Jian Qiang , Ding Yong Gang , Li Da Wang
Published: December 2010

The seismic response of the asymmetric structure isolated by the friction sliding bearings is carried out. The eccentricity and the torsional stiffness of superstructure are taken into account. The eccentricity and the torsional stiffness of the superstructure have less effect on the horizontal response of the base-isolated structure, but these have significant impact on the displacement at the corner of the superstructure and the rotational response of the structure.
Seismic Behavior of Shifang Telecom Building under Conventional Earthquakes
Authors: Hu Xiao , Gao Yong Tao
Published: December 2010

To study the seismic behavior under conventional earthquakes, according to a case of Shifang Telecom Building (STB) under 5.12 earthquake, this paper makes the computation of internal force and deformation of structure; then compares the seismic behavior of two different models with spectrum analysis and time-history analysis. The conclusion shows that STB can approximately meet requirements for fortification against seismic impact under conventional earthquakes; the steel tower on top can amplify the seismic effect indeed and the weakness of numerical simulation tallies with the reality.
Dynamic Response on Earthquake Analysis of Bridge Structure Isolated by Lead-Core Rubber Bearing
Authors: Yang Hai Xu , Wang Hai Biao , Li Bao Kuan , Yao Jian Gang
Published: December 2010

The dynamic analysis of earthquake responses of one simple bridge structure supported by hinged and rolled bearing and another simple bridge structure isolated by lead-core rubber bearings was described in elastic-plastic range. The relative displacements and accelerations of the structures were calculated under different amplitude earthquake waves in order to observe the influence of lead-core rubber bearing on earthquake- resistance of bridges. The availability of the analysis model, hysteretic model and relevant parameters adopted as well as the computation program developed are verified. According to the analysis of dynamic response data, the lead-core rubber bearings with proper parameters are used to improve the dynamic performance of the structures, the seismic response of the bridge deck and pier would therefore be greatly reduced, the safety and seismic performance of the structure are globally raised, earthquake- resistance could be increased, and rather good economic benefits have been achieved as well. The analysis can provide accurately the reference basis for construction design.
Wind Loading and Wind Effects on the Roof of Harbin West Railway Station
Authors: Wu Di , Sun Ying , Wu Yue
Published: December 2010

Taking Harbin west railway station as the researching object, the wind load distribution as well as its effects, which are widely used in practice, is investigated. First, wind pressure distribution on a rigid model is measured simultaneously in a wind tunnel. Some special characteristics of the measured wind pressure, especially its fluctuating component, are discussed. Then the fluctuating wind pressure field is reconstructed based on the synchronous multi-pressure scanning technique of wind tunnel tests and the proper orthogonal decomposition (POD) technique. The influence of lower RC structure on wind-induced vibration is investigated using non-linear time-history analysis. At last, a new method is introduced to obtain equivalent static wind load (ESWL) that reproduce all largest load effects at the same time. With the synthetic application of above methods, the problems such as: complex time and spatial distribution of fluctuating wind; multi-mode vibration of wind-induced response; multiple equivalent objectives for ESWL, can be solved efficiently.
Nonlinear Numerical Simulation of Shaking Table Tests of a RC Frame-Shear Wall Model
Authors: Wang Tao , Sun Jing Jiang , Meng Li Yan
Published: December 2010

In this paper, to verify the effectiveness and reliability of nonlinear numerical simulation based fiber model, two computer programs (CANNY 99 and IDARC-2D), in which shear wall elements were respectively simplified by fiber model and equivalent beam model, were adopted to perform the numerical simulations of 10 times shaking table tests of a nine story 1:6 scale frame-shear wall building model in this paper. Analysis model including beam, column and wall element in CANNY 99 is elaborated in detail. Test results are compared with simulation results in some aspects such as natural frequency, time history responses, and peak value responses. Results demonstrate that fiber model and Equivalent beam model can simulate the elastic-plastic earthquake response of R.C. wall structures very well.
A New Type of Hybrid-Passive-Damper
Authors: Liu Ai Rong , Yu Qi Cai , Yao Yuan , Guo Yu Zhu
Published: December 2010

This paper investigated the superelasticity and hysteresis characteristics of TiNi shape memory alloy ( SMA ) wire at room temperature, then the mechanical parameters of which were obtained. Based on the TiNi SMA wire and a purchased viscous damper, a new type of hybrid-passive-damper was designed and developed. Experiments were performed in order to validate the relationship of loading frequency and characteristic parameters such as energy dissipation capacity, equivalent damping ratio and equivalent stiffness. Experimental results show that hybrid-passive-damper designed in this paper has excellent energy dissipation capacity and is suitable for the vibration control of structures with long vibration period.
Wind Load Time-History Simulation Study Based on Neural Network
Authors: Hu Wei Bing , Li Qian
Published: December 2010

In this paper, on the basis of the existing research and Matlab, scientific computing software, and through the characteristics of the artificial neural network theory, it presents artificial simulation of wind loads which are set up by BP neural network, and it mainly consists of the preparation of sample set, the certainty of network layer and hidden nodes, and the selection of activation functions and training methods. Based on Matlab and the neural network toolbox, it carries out the constriction, training and testing of neural network. According to the simulation of five different positions of horizontal wind speed time, it proves that the artificial neural network term wind loads simulation models are effective in practical application.
Prestress Rubber Isolator and its Mechanical Properties
Authors: Zou Li Hua , Huang Kai , Zhang Wei , Rao Yu , Wang Li Yuan
Published: December 2010

A new seismic isolation system,namely the prestress rubber isolator(PRI,Chinese patent application number:200910174415x),is introduced.The basic principle of this new isolator is: making all or part of vertical deformation of isolator be finished in advance by exerting a longitudinal pre-compressional stress on the rubber isolator with flexible cables, the prestress tension cables become loose because of unloading after the exerting of superstructure loads,and the loose cables can limit the horizontal displacement and resist the tension of isolator. The calculation formula of horizontal stiffness of isolator is derivated,and the mechanical properties are researched. The research results show that:besides the horizontal isolating property of common rubber isolators,the prestress rubber isolator has also properties of reducing vertical deformation, limiting horizontal displacement and resisting tension.Moreover,the prestress isolator has also a certain vertical isolating affect because of the improve of rubber thickness.
Research on Blast-Induced Seismic Action
Authors: Yan Zhi Xin , Bao Tai , Wang Hou Yu
Published: December 2010

A blast-induced seismic wave is an instantaneous, complicated wave different from natural seismic wave. It has characteristics such as high frequency, fast vibration intensity attenuation rate with distance increasing, short duration, generally small hypocenter energy and short blast-induced seismic wavelength, etc. In this paper, in combination with the properties of rock and soil, through using stress-strain relation and transmission characteristics of wave in different media, the author explored the mechanism of action that blast-induced seismic vibration has upon rock and soil. Meanwhile, the time-space process of action that blast-induced seismic vibration has on structure under different circumstances is deeply explored. Moreover, the impacts that blast-induced seismic vibration characteristic and structure’s dynamic behavior have on structure response under the effect of blast-induced earthquakes are discussed. Thereby the mechanism of action that blast-induced seismic vibration generates on structure is revealed.
Parameters Analysis of Train Running Performance on High-Speed Bridge during Earthquake
Authors: Lin Yu Sen , Xin Li Hua , Xiang Min
Published: December 2010

A model of coupled vehicle-bridge system excited by earthquake and irregular track is established for studying train running performance on high-speed bridge during earthquake, by the methods of bridge structure dynamics and vehicle dynamics. The results indicate that under Qian’an earthquake waves vehicle dynamical responses hardly vary with the increasing-height pier, but vehicle dynamical responses increase evidently while the height of pier is 18m, which the natural vibration frequency is approaching to dominant frequency of earthquake waves. Dynamic responses are linearly increasing with earthquake wave strength. Dynamic response of vehicles including lateral car body accelerations and every safety evaluation index all increase with train speed, so the influences of train speed must be taken into account in evaluating running safety of vehicles on bridge during earthquakes, but lateral displacement of bridge is varying irregularly. Dynamic responses and lateral displacement of bridge reduce under the higher dominant frequency of earthquake wave. Derailment coefficient, later wheel-rail force and lateral vehicle acceleration become small with increasing damping ratio. Vertical vehicle acceleration and reduction rate of wheel load are hardly varying with damping ratio.
Research on Anti-Rutting Performance of High Modulus Asphalt Concrete Pavement
Authors: Ouyang Wei , Yu Guo Feng , Zhu Fang Fang
Published: December 2010

The new ways of anti-rutting was put forward by improving modulus of asphalt concrete and the effect of HMAT(high modulus asphalt concrete) on rutting is studied in view of mechanics; The cause of asphalt pavement track is closely related to pavement structure under load. Starting from the mechanism of rutting, the mechanical property of HMAT and the effect of modulus in middle layer on the rutting were analyzed; the dynamic stability and modulus of HMAC were analyzed by text and the result show that Increase of the dynamic stability and modulus of HMAC went against rutting; The mechanism of pavement structure was analyzed by the numerical analysis show that the maximum shear stress occurred in middle layer of pavement structure according to mechanical calculation. HMAC can raise modulus of elasticity of middle layer. HMAC can also improve stress state of pavement structure, reduce shear strain and prevent asphalt pavement track.
Position Determination in Three Dimensional Structural Testing System
Authors: Wang Xian Feng , Xing Feng , Obata Makoto , Goto Yoshiaki
Published: December 2010

A three dimensional structural testing system for static and pseudo dynamic test is developed, in which a coordinate system has been used in the measurement. The center of the ball joint hinge in an almost neutral position for the displacements of three actuators was the origin. However n process since the initial error cannot be controlled. This makes it difficult to exactly compare the results for different coordinate systems though the error is small. In this paper, to eliminate this difference, we set up a new coordinate system with the origin being the point of absolute zero of the actuator displacements. Since the origin usually cannot be measured directly, the new coordinate system is determined by appending three unknowns and a set of equations at the origin. The transformation between the new coordinate system and the previous one is obtained using a shift and Eulerian angles.
Analysis of a Heat Flux over a Region with a Crack near a Rigid Inclusion
Authors: Wang Xian Feng , Xing Feng , Hasebe Norio
Published: December 2010

The thermoelastic problem of a heat flux over a region with a crack near a rigid inclusion is studied. The inclusion is assumed fixed, which implies the translation and the rotation are restrained. The crack faces are assumed free of stress. Both of the inclusion and the crack are under thermal adiabatic condition. In the analysis, the original problem was reduced to a series of displacement boundary value problems by using the principle of superposition. The Green’s function method is used to obtain the solution of the prescribed problem in the forms of integral equations. The basic problems therefore become those for an edge dislocation, and for a heat source couple, as well as the problem of a plane containing the inclusion under a uniform heat flux. These problems are solved using the complex variable method along with the rational mapping function technique. The variations of the stress intensity factors at the crack tips with various crack lengths and heat flux angles are shown. The effects of the inclusion shape and size are also investigated.
A Destructive Field Study on the Behavior of Pile under Ten
Authors: Zhang Shi Min , Wei Gang
Published: December 2010

This paper involves a destructive full-scale load test on long bored pile instrumented with strain gauges along the shaft. The load-displacement response, the distribution of axial force, and the thresholds of displacement for fully mobilizing the skin resistances in different soils in tension case were discussed in this paper. The field test results show that the measured tip resistance in the pile under tension is near zero during the whole loading, and the softening is accompanied with a reduction in skin friction when the skin friction is fully developed. It also can be investigated that the threshold of displacement for fully mobilizing skin friction is different even if in the same soil type due to different soil stress states. Generally speaking, the thresholds of relative pile-soil displacement for fully mobilizing skin frictions in the sandy silt, silty sand mixed silt, silty clay, silty clay mixed sand and gravel are about 4 mm, 11 mm, 7 mm, 6 mm, and 5.5 mm, respectively.
The Seismic Analysis of Kiewitt Shell Based on the SMA Three-Dimensional Isolator
Authors: Wang Jin Li , Liu Hai Qing
Published: December 2010

The SMA 3D isolator is based on a new intelligent material: shape memory alloy, which compensate the weakness in stiffness of the laminated rubber bearing. Through the seismic analysis of the kettlewell double layer shell, the truss horizontal and vertical internal force dropped obviously with the SMA 3D base isolator, especially the outer part which easily happened deformed damage and the structure internal force distribution is more reasonable, the deformation in harmonies, the lattice damage of weakness part is limited and offer efficient protection. Either the acceleration analysis, the peak acceleration reduced significantly and time history tends to slow, the isolating effect of the SMA 3D base isolator is prior to the laminated rubber bearing.
Application of Grouting Technology
Authors: Yi Wen , Wang Yong He , Zhou Rui
Published: December 2010

The wide range of grouting technology, theory and construction technology are relatively mature, but as a result of the promotion of its application is still uneven, and grouting construction works are hidden, so often cost more is spent in grouting reinforcement work, but the expected results of the problem is not yet achieved. In this paper, it is given a comprehensive summary of the effect of grouting and the application of inspection techniques. It is given analysis of the key issues of technology, and hopes to provide reference with the grouting reinforcement of engineering practice.
Static and Buckling Behavior of a Beam with Changeable Boundaries
Authors: Luo Yong Feng , Yu Rui , Yang Wei
Published: December 2010

A structure with “changeable boundaries”, changed from construction stage to service stage, is a new design idea used in long span spatial structures. The inner force distribution will be more reasonable and the structure self-weight will be lighter, if the idea is adopted. Adoption of the idea enables the inner force distribution of the structure changing from the construction stage to the service stage. Although the time of the inner force changing is much short, it has a significant influence on the loading behavior and the construction cost of the structure. As an example, a simple beam with different boundaries (unchangeable and changeable), under uniformly distributed lateral loads, is analyzed in this paper. Through static analysis, the loading behavior of the beam under three different boundaries, including simple support, fixed support and changeable boundary, is compared. The linear buckling behavior of the beam with changeable boundaries is also investigated. The critical equilibrium equation is derived subsequently for computing the critical stability load. A new computation method for the beam with changeable boundaries is proposed.
Bending Behavior of Hybrid High Performance Steel Beams
Authors: Wang Chun Sheng , Duan Lan , Wei Ming , Liu Li Xiang , Hu Jing Yu
Published: December 2010

This paper investigates the flexural strength and ductility of hybrid high performance steel (HPS) I-beams. Three simple supported I-beams were tested to study the bending behavior of hybrid beams with Q&T HPS 485W in flanges and Q235 in webs. Experimentally verified nonlinear finite element modeling techniques were then employed in a parametric study including the influence of cross section compactness and material match in hybrid design on rotation capacity of beams. It is observed that the compactness of flange and web have a major influence on the rotation capacity of flexural beam. As a result, appropriate compactness criteria are suggested for use in the design of HPS 485W hybrid beams employing compact webs made from lower strength steels.
Design and Construction on the Roof Systems of Guangzhou South Railway Station
Authors: Liu Yan , Sheng Ping , Zhen Wei
Published: December 2010

The roof structures of Guangzhou South Railway Station are long-span spatial steel structures, The form and structure system are complicated. Prestress cable-arch structure, cable-shell structure and tri-directional truss-string spatial structure are applied. It recommend the construction and design process of roof structure, and also give an analysis of roof structure's working principle on prestress cable-arch structure , cable-shell structure, and the tri-directional truss-string structures. The results show that working stability of the roof structures is good.
Analysis of the Structure Style Selection for Ocean Engineering Floating Structure
Authors: Liu Wen Bai , Xi Shi Lei , Cheng He Sen , Gu Yu Xi
Published: December 2010

Use finite element analysis software ABAQUS to analyze the bearing capacity, strength and wave attenuation performance of very large ocean engineering floating structure based on spatial grid structure, and analyze selected ocean engineering floating structures with different geometrical dimensions. The ocean engineering floating grid structure attenuates wave effectively, whose bearing capacity and strength are high. In the static loads and wave forces analysis, with the dip angle α of belly poles increasing, the maximum stresses decrease, and the bearing capacity lowers; with the height h of the pyramid larger, the maximum stresses and the bearing capacity increase; with the od D of the poles and sphere joints subjoining, the maximum stresses change in concave shape in the whole, and the bearing capacity increases in turn; with the wall thickness t1 of the poles increasing, the maximum stresses under static loads become smaller, but under wave forces the maximum stresses change in concave shape, the bearing capacity declines. The bearing capacity, strength and wave attenuation performance of the structure are influenced by it’s geometrical dimension regularly, and so will affect the project implementation in a practical way.
Research on Behaviors of Steel Fiber Reinforced Concrete Filled Steel Tube Columns under Axial Load
Authors: Lu Yi Yan , Li Shan , Chen Juan
Published: December 2010

Many in-fill materials are used to improve ductility of concrete filled steel tube (CFST), due to meeting need for a change of seismic design perspective form the previous emphasis on structural strength to emphasis on structural ductility and energy absorption. Among the various in-fill materials, steel fiber is gaining attention in the CFST column. This paper investigates effect of volume fractions of steel fiber to concrete on the behavior of short steel fiber reinforced concrete filled steel tube columns under axial compression. The volume fractions of steel fiber to concrete are 0.6, 0.9 and 1.2%. The results indicate that steel fiber reinforced concrete filled steel tube columns appears to have a significant increasing trend in ductility, and have a slight increasing trend in load capacity with volume fraction of steel fiber to concrete increasing. The failure mode of the composite columns is similar with that of CFST.
Tests on Strength of Coped Beams with Web Stiffening
Authors: Yam Michael C H , Ma Hong Wei , Chung Kwok Fai
Published: December 2010

In steel construction, when beams have to be connected to a girder at the same elevation, beam flanges must often be coped to provide enough clearance for practical joint formation. The presence of a cope in a beam will reduce the strength of the beam in the coped region. To improve the strength of coped beams, web reinforcements at the coped region were proposed in previous research studies. This paper reports the results of the first phase of the experimental program. A total of 8 tests were conducted. The test parameters include the length of longitudinal stiffeners, cope depth to beam depth ratio, cope length to beam depth ratio, and doubler plate. The test results show that the strength of the coped beam specimens was significantly increased when stiffeners were used in the cope. The increase in strength due to the presence of the longitudinal stiffeners could be as high as 96%. The longitudinal stiffeners were able to prevent local web buckling from occurring at the cope, however, the final failure mode of the beams was yielding of non-reduced section followed by rigid body movement of stiffener. The doubler plate was able to increase the strength of the beams; however, the final failure mode of the beams was still local web buckling.
Experimental and Finite Element Analysis on the Ultimate Bearing Capacity of Hollow Spherical Joints with Ribbed Stiffener
Authors: Yu Jiang Tao , Yu Ke Quan , Tang Bo
Published: December 2010

Four groups (12 in total) of welded hollow spherical joints with ribbed stiffener were tested under uniaxial loads in this paper. With the adoption of elasto-plastic model and consideration of geometric and material nonlinearity, the whole loading process of the specimens was simulated by ABAQUS. Through combining the test data and computing results, two recommendations used to quantitatively determine the ultimate failure load of spherical joint in test are proposed. The relationships between bearing capacity and various influence factors, which include the thickness and diameter of hollow sphere, diameter of steel tube are analyzed and illustrated at the end of this paper.
Research on Hysteretic Behavior of Angle Beam-Column Connections
Authors: Li Feng Xia
Published: December 2010

In practice most connections actually show semi-rigid deformation behavior that can contribute substantially to overall displacements of the structure and to the distribution of member forces. So it is very necessary that studying the behavior of these semi-rigid connections under cyclic reversal loading. Two full-scale specimens of top-mounted-angle using H-section member had been conducted. The specimens were subjected to cyclic reversal loading simulating earthquake effects on a steel moment-resisting force. The objective of the work is to determine the behavior of these connections under cyclic reversal loading well into the inelastic range and to ascertain the effect of design parameters such as column flange stiffener, pre-tension of bolts and the top-mounted-angle steel flange thickness on the overall behavior. Observations were made concerning the response of the connections and its elements in terms of strength, stiffness and energy dissipation. Information on the design of these connections is presented. It is concluded that top-mounted-angle connections can possess the relative high stiffness, strength and excellent ductility as moment-resisting components in the seismic design of frames. Most of the input energy was dissipated in top-mounted-angle while the column participated a little in the energy dissipation process in the test. It is analyzed that the preload of bolt, contact pressure of the components and the other components’ mechanical properties by nonlinear analysis. These consequences are good reference for the engineering design.
Analysis of Influence on Mechanical Behavior of Jiubao Bridge Caused by Construction Process
Authors: Yang Guo Tao , Su Qing Tian , Wu Chong
Published: December 2010

Construction procedure of the tie arch bridge with steel-concrete composite girders affects the mechanical behavior of the whole bridge significantly. Space finite element model of Jiubao Bridge was established. Different construction procedures of the tie bars and bridge decks were proposed and the stress of upper and lower flange of the girder and the concrete bridge decks under construction schemes had been analyzed. The calculation results show that the scheme that the tie bars are stretched finally can reduce the tension stress of the bridge decks significantly. The construction scheme that the bridge decks are constructed on full space supports is favorable to the girder over the V-shaped piers.
The Mechanical Behavior Study on Reduced Beam Section and Widened Beam Section Connections of Steel Frames
Authors: Wang Yan , Liu Xiu Li , Yu You Sheng
Published: December 2010

In the paper, finite element models are established by using numerical methods to study the mechanical behavior of these kinds of connections. By discussing the range of design parameter of reduced beam section connection and widened beam section connection, stress distribution of connections and the influence of design parameter on bearing capacity at elastic stage and plastic stage are studied. The FEM models of these two kinds of connections behaved good ductility behavior. The purpose of moving plastic hinge outward from the beam and column interface is realized. Stress concentration near welds at the end of beam is reduced significantly. The bearing capacity of widened beam section connection increase obviously due to expanding the local area of beam flanges at the end of beam, but that of reduced beam section connection decrease due to trimming beam flanges. After studies, the range of design parameter of reduced beam section connection and widened beam section connection are given in the paper, and comparing with FEMA-350 [14] of American. The suggestion parameters would be useful for seismic design of steel frames.
Reliability Analysis of H-Beam Transfer Truss Under Construction Loads
Authors: Chen Zheng Fa , Liu Gui Feng
Published: December 2010

Study on the reliability of H-beam transfer truss was based on the rebuilding of 1# office building of Chinese Ministry of Commerce. Under construction loads, the force analysis of the H-beam transfer truss was carried out with the software STS2005.12. In the paper, the right of trusses node connection was first chosen, and a plane calculation model of H-beam transfer truss was established based on some reasonable assumptions. Then, the force of H-beam transfer truss under construction loads was analyzed with the calculation model, in determining a reasonable control indexes and calculation parameters. From the results of analysis, we could see that the design and application of H-beam transfer truss in the stage of construction was safe and reliable, in the dismantling concrete post of old structure.
Three TMCS Hydrophobic Modification Methods of New Building Insulation Material SiO2 Aerogels
Authors: Zheng Wen Zhi , Ding Wei Guo , Ouyang Bo Ju , Chen Hai Jian , Chi Zhen Yue
Published: December 2010

Trimethylchlorosilane as a modifier and tetraethoxysilane, an acid catalyst, as raw material were modified hydrophobically through the copolymerization, surface derivative, and hierarchical hydrophobic modification methods. The modified material was prepared as hydrophobic SiO2 aerogels by constant pressure drying. Finally, thermal stability, pore structure, and chemical composition of SiO2 aerogels were analyzed using TG-DSC, FTIR, and BET. The results show that the hydrophobic property of SiO2 aerogels prepared using hierarchical hydrophobic modification and surface derivative methods have excelled characteristics, such as super-hydrophobicity. The aerogels prepared through the two different methods have a mesopore structure with mesopores of 2–70 nm; however, they have no micropore structure.