bluuebunny/crossref_metadata_2025 huggingface dataset:
The Alignment Control of Large-Span Continuous Beam Bridge Cantilever Construction Method
Authors: Peng Xiao Tao , Xiong Yi , Wu Yong , Meng Dan
Published: August 2013

One long-span bridge adopted the cantilever casting method, which is pre-stressed concrete variable cross-section continuous box girder structure. In the construction process, due to the concrete pouring, hanging basket moving, construction loads, pre-stressed tension, concrete shrinkage and creep, temperature, humidity and many other factors. There will be such problems of cantilever beam segment closed error and the bridge line-type do not coincide in design goals. In this paper, we use the bridge dedicated finite element program MIDAS / Civil procedural for modeling and structural analysis. Analyze the problems of deflection control and pre-camber adjustment of cantilever construction, in order to ensure that the bridge closure smoothly in accordance with the design standards.
Selecting Single Optimal Excitation Position for Spatial Truss Structure's Damage Detection Based on Euclidean Distance
Authors: Yan Jing Jing , Zhang Li Mei , Liu Wei Ran , Du Shou Jun , Fan Meng
Published: August 2013

According to characteristics of frequency-intensive on spatial truss structures, maximum isolation each modal is a good solution to this question. Considering this idea, calculating modal weighting coefficients of spatial truss structures through dynamic response expression, mode vector and objection vector can be obtained. An objection function was established based on euclidean distance. When the euclidean distance between mode vector and objection vector minimize, the optimal excitation position can be also received.
Space Rigid Frame Damage Identification Method Based on Modal Analysis
Authors: Jia Hong Yu , Yue Peng Fei , Wang Xiao Fei
Published: August 2013

Space frame structure of no damage and injury finite element models were established with ANSYS, and analyze 3D curvature mode as well three-dimensional vibration mode variety rate of the space rigid frame based on modal analysis. Curvature mode and three-dimensional vibration mode variety rate as the labeled amount was selected and applied to structural damage. The calculated results showed that the first-order curvature mode not only identify against single or multiple damage location, but also determine the initial degree of injury, and the axial curvature mode is better than the horizontal curvature mode for damage identification; The calculated results also showed that the variety rate of the first-order vibration mode can identify against damage location. Methods were provided by identifying the space frame structural damage of the curvature mode or three-dimensional vibration mode variety rate.
A New Damage Alarm Index Based on Frequency Deviation for Structural Health Monitoring
Authors: Song Yan Sheng , Ni Wei Ning , Sun Zong Guang
Published: August 2013

Based on the statistics probability of certain order frequenciy deviates from its normal range, this paper puts forward a new damage alarm index and corresponding damage alarming method for structural health monitoring. Demonstrating the feasibility of this method, this article introduces the damage alarming method to analize the benchmark steel frame in frequency domain. The results show the abnormal index and its corresponding alarming method defined in sense of statistics indicates the abnormity of corresponding test cases clearly.
Analysis of Group Pile Foundation Environmental Factors Based on Bayes Estimation
Authors: Xue Tao , Xu Jun Fa
Published: August 2013

The environmental factors have complex effects on the bearing properties of group pile foundation. Based on the "growth" process of the Sutong Bridge and the combination characteristics of environment factors, the relationships between the measured values of the group pile foundation and environmental factors were established. Then, the correlation decision determinations between the measured values and environmental factors were obtained by using the Bayes estimation fusion algorithm. Finally, the impacts of different environment factors on the bearing properties of group pile foundation had been got. The results showed that the impact of seasonal temperatures on the mechanical performances of the group pile foundation is very large.
Study on Seismic Response Control of Self-Anchored Suspension Bridge with TMD
Authors: Zhang Lian Zhen , Chen Tian Liang , Xiong Wei
Published: August 2013

Large span self-anchored suspension bridges which are located in the strong earthquake zone often have no sufficient anti-seismic capacity, especially the bridge pylon. Therefore, seismic response control is necessary. This paper studies the lateral damping control effects of one large-span self-anchored suspension bridge with tuned mass damper (TMD). Using a spatial dynamic analysis finite element mode, the seismic responses are calculated out. Seismic response analysis results show that a large lateral displacement appeared at the pylon top under the lateral seismic action and the moment peak at the pylon bottom is nearly reaching its equivalent yield moment gotten by moment-curvature curve, which would be resulted in a high risk of collapse of self-anchored suspension bridge under lateral earthquake action. Therefore, one TMD is considered to be applied on the pylon top of the self-anchored suspension bridge to reduce the seismic response. The simulation result shows that the TMD can provide remarkable effect on seismic response control of the pylon. The control efficiency of TMD can be up to 23.4%. The moment at the pylon bottom and the displacement at the pylon top both decrease obviously. The parameter analyses of TMD are also performed to get the best design parameter. The research results can be used as the reference of seismic response control or anti-seismic design for the same type of bridge.
Wavelet-Based Multilevel Discrete-Continual Finite Element Method for Local Plate Analysis
Authors: Akimov Pavel A. , Mozgaleva Marina L.
Published: August 2013

High-accuracy solution of the problem of plate analysis is normally required in some pre-known domains (regions with the risk of significant stresses that could potentially lead to the destruction of structure, regions which are subject to specific operational requirements). The distinctive paper is devoted to correct wavelet-based multilevel discrete-continual finite element method for local analysis of plates with regular (in particular, constant or piecewise constant) physical and geometrical parameters (properties) in one direction. Initial discrete-continual operational formulation of the considering problem and corresponding operational formulation with the use of wavelet basis are presented. Due to special algorithms of averaging within multigrid approach, reduction of the problem is provided. Resultant multipoint boundary problem of structural mechanics for system of ordinary differential equations with piecewise-constant coefficients is given.
The Research of Several Problems that Merit Attention in Use of Rebar-Planting Anchorage Technique for Reforming and Strengthening Buildings
Authors: Lv Nan , Li Hui Min
Published: August 2013

The rebar-planting anchoring , based on the development of the technology in the field of architecture both at home and abroad and applications, and combining with the mechanics performance of planting-bar, , technical requirement and the anchoring depth of the relevant specification, for the imperfections in the application of this new technology put forward the corresponding improvement suggestions.
Analysis on Hysteretic Strain of Load-Carrying Strengthened RC Beams
Authors: Li Chun Xia , Ding Zhi Sheng , Yan Shi Lin , Chen Jun Ming
Published: August 2013

Based on the reported experimental result of unchanged neutral axis position during loading and unloading, the theoretic formula of hysteretic strain after unloading is obtained for different loading condition. The reinforcement ratio is the most important factor influencing the hysteretic strain, relative unloading degree secondly, and strength of concrete and steel influencing weakly. The simplified formula of hysteretic strain is presented by a series of regression, which replacing linear interpolation between neighboring reinforcement ratios in the current code. The calculated value is close to that from the current code for the regular reinforcement ratio, but comparatively higher for short reinforcement ratio caused by steel corrosion.
The Research of SFRC Column Reinforced by FRP
Authors: Li Xiao Xia
Published: August 2013

4 groupsconcrete columns specimens which have different eccentricityities were fabricated , The first specimen was just made of reinforced concrete. The second was enlaced with 3 lays carbon fiber reinforced polymer. The third had SFRCs added to it. The last was reinforced with SFRCs and enlaced with carbon fiber reinforced polymer.The results showed that the introduction of fibres as well as wrapping the specimens with FRP improve the strength of concrete,especially its ductility.
Study on Experiment of the Wire Rope Bottom Anchoring
Authors: Cui Xi Guang , Yang Wei , Ding Jian Wei
Published: August 2013

In this paper, we research wire mesh and polymer mortar strengthening of the wire rope end which use MLJ building structural adhesive anchorage in experiment. This text discusses the building structural adhesive for wire rope anchorage performance, through the experiment and data analysis showed that the modified structural adhesive anchorage cable can give full play to the wire rope high strength properties.
An Experimental Study on the Axial Compressive Behavior of Timber Columns Strengthened by FRP Sheets with Different Wrapping Methods
Authors: Li Lang , Yuan Shi Lei , Dong Jiang Feng , Wang Qing Yuan
Published: August 2013

In order to check out the effects of the method how the FRP sheets wrapped on the axial behavior of timber columns confined by CFRP sheet, 6 short columns were confined with CFRP sheets in different wrapped ways, i.e. toroidal, single helix, double helix and cross helix. Another column in the same size was prepared as contrast. The ultimate carrying capacity of the specimens was analyzed as well as the load-displacement curves and strain-stress relationships. The comparison of the ultimate carrying capacity showed significant enhancement when the specimens were confined in any ways, and the way wrapping FRP sheets in the toroidal direction was more efficient than other ways in which the FRP sheets wrapped in the experiment. The analysis of the load-displacement curves indicate that the stiffness of the specimens was improved by the reinforcement with FRP sheets in any ways, however, the improvement of the ultimate carrying capacity and the stiffness was in the cost of the ductility. The comparison of the FRPs train between the specimens with toroidal wrapping method and the helix ones can clearly explain the lower efficiency in the enhancement of ultimate carrying capacity of the specimens with helix wrapping methods.
Research on Non-Destructive Testing for Defects of Steel Bar in Concrete
Authors: Yang Jing , Yuan Wei Heng , Tan Jun
Published: August 2013

Steel bar defect detection in concrete is an important content of civil engineering structure detection. Currently there are no effective methods for nondestructive testing of steel bar defects . This paper studies the application of electromagnetic induction technology for Steel bar defect detection. Firstly, the principle of electromagnetic induction technology to detect rebar are described. Secondly,an air dielectric test device was designed and Steel bar defect in the device was detected by magnetic scanner. Through analyzing we got the characteristics of scanning images from different Steel bar defects. Thirdly this experimental result was compared with detection result in concrete.Finally verify the accuracy and feasibility of this method.
Virtual Reality Techniques for Ancient Building Protection and the Establishment of Database - Taking Foshan Zumiao as an Example
Authors: Li Yue Qiong , Zheng Gang
Published: August 2013

Foshan Zumiao is one of the three major treasures of the Lingnan ancient buildings and the establishment of the Digital Zumiao is a cultural project of important significance. By means of the combination of the overall-view images obtained by high dynamical light rendering technique (HDR) and the images with digital back ultrahigh resolution, with the multimedia database as the bolster, the Digital Zumiao realizes the reflection of the entity space of the Zumiao building in the virtual environment. Based on this target and experienced the processes and works such as the data survey and acquisition of the Digital Zumiao, analysis and processing of images and word data, and the set up of multimedia database of the Digital Zumiao etc. the virtual reality system and the digitalizing system of the Digital Zumiao were established .
Study of Flexural Property of Prestressed Carbonfiber-Reinforced Plastics (CFRP) Reinforced Concrete Beams
Authors: Wang Bo , Men Guang Xin
Published: August 2013

To study the effect of prestress level on beam for its flexural property, through comparing of the stress property of non-reinforced beam, non-prestressed fiber beam, and prestressed fiber beam. The experimental results show that non-prestressed fiber makes little difference in improving beams flexural property, while prestressed fiber has improved beams cracking load, yield load, bending rigidity greatly.
Numerical Simulation of Masonry Walls Retrofitted by Prefabricated Reinforced Concrete Panels
Authors: Zhang Yong Qun , Wang Tao
Published: August 2013

Assembly technology using prefabricated reinforced concrete (RC) members can effectively improve the seismic performance of existing masonry buildings. In this study, an existing masonry wall is enhanced by two pieces of prefabricated RC panels bonded on both surfaces of the wall. In order to guarantee the co-action between RC panels and the masonry wall, three techniques are employed, specifically, RC dowelling keys, grouting agent, and post-cast concrete bands. To investigate the interaction and force transmission between the two components, this study builds sophisticated finite element models and conducts nonlinear analyses to simulate the quasi-static cyclic tests. It is demonstrated that the proposed retrofitting technology effectively improves the seismic performance of existing masonry walls. The strength of existing walls increases 3-4 times and the stiffness increases 2-3 times, so that the requirement of current seismic design code is satisfied.
Application of Buckling-Restrained Braces in Prefabricated Reinforced Concrete Frame
Authors: Wang Hong Nan , Liu Hua Bo , Wang Jian Feng
Published: August 2013

The old prefabricated reinforced concrete buildings have been designed with old standards that are lower than the present design code provisions. These buildings are likely to be vulnerable to severe damage or total collapse under strong seismic excitations. Hence, it is necessary to evaluate these buildings seismic performance and to retrofit them using appropriate methods. Buckling-restrained brace (BRB) is a kind of prospective energy dissipation component. As a brace, it is also a lateral force resistant member. Based on the characteristics of prefabricated frame and BRB, the time history analysis of a prefabricated frame strengthening by BRB is carried out by using software ANSYS to input the seismic wave. Then, the seismic behavior of this kind of frame is studied. It is observed that the seismic response of the retrofitted structures reduces significantly in comparison with the corresponding original structure without any retrofit measures.
An Experimental Study on Mortar-Filled Buckling-Restrained Mechanism
Authors: Teng Rui , Lei Yuan De , Wang Tao
Published: August 2013

Buckling-restrained braces (BRBs) have been widely used in earthquake resistance structure systems, which are designed to yield in both tension and compression. Among most mortar filling BRBs, the bearing capacity in compression is higher than in tension particularly at large displacement. This leads the joints to suffer extra force and thus unfavorable for structures. This paper presents a set of experimental results of BRBs with different unbonding materials and specific nonyielding segments. Four models with different unbonding materials are tested in axial compressive with stationarily increased displacement amplitudes. These models are all featured with reinforced nonyielding segments to prevent lateral buckling. Both experimental and numerical results indicate that epoxy resin is the best unbonding material that can avoid transferring the axial force to the restrained part and the new reinforcement in nonyielding segments can effectively prevent lateral buckling.
Testing Study on the Bending Capacity of Stone Beam Reinforced with CFRP
Authors: Wei Xi , Zhao Dong , Zhang Wei Xi
Published: August 2013

After hundreds years damage, the disease of stone structure member is very severity, and so structure reinforcement has great significance. In this paper, the bending capacity of stone member reinforced with CFRP is studied through the test combined with the protective project of Huangsong Stele. The tests totally have six stone beams to study the mechanics performance and damage model of original and reinforced stone beam. The bending capacity theory of reinforced beam is discussed. The study results revealed that the bending performance of stone beam reinforced with CFRP can ameliorate greatly, and the destroy model change from brittle failure of normal section to ductile failure of oblique section, and the bend-resisting capacity of stone beam reinforced with CFRP can be enhanced greatly. But the enhanced range isnt direct proportion with the dosage of CFRP. The calculate formula of bending capacity got from theory deduce joint the test result, so it can be used to guide the design of fact project. So, the reinforcement of stone bending beam with CFRP have well effect.
Research on Carbonation Life Prediction Model of Recycled Concrete Structures
Authors: Wang Bing , Wang Si Yuan , Wu Shuan , Wang Xin , He Xia
Published: August 2013

Based on available achievements on carbonation life prediction model of recycled concrete structures at home and abroad, suggested values of recycled coarse aggregate influence coefficient in the practical mathematics model of recycled concrete carbonation depth was put forward through the comparative analysis. Tensile stress influence coefficient in the empirical model of recycled concrete carbonation depth was revised by mathematical regression analysis. The sensitivity analysis for empirical model was undertaken. Results show that the influencing sequence of the carbonation life impact factors of recycled concrete structures is: cover thickness, recycled concrete strength, relative humidity, environment temperature, tensile stress ratio, CO2concentration.
Pipeline Support under the Loads of Comparative Analysis
Authors: Yang Kun Qi , Chen Kai , Zhu Yan Peng
Published: August 2013

This article mainly analyzed the load of fixed and movable pipe supports in the catalyst factory,then classified the load. A calculation was made using MIDAS/CIVIL software modeling. The results show that the bending moment and displacement are all the same in axial of movable and fixed pipe supports, and the axial displacement is influenced heavily by load. Fixed pipe supports are less affected by lateral load, but movable pipe supports are more affected by lateral load. The results can help us to design the pipe supports reasonably.
Simply Supported Slab Bridge Damage Identification Based on Curvature Mode Method
Authors: Zhang Long
Published: August 2013

This paper discusses the feasibility of damage identification on simply supported slab bridge by the curvature mode. Firstly, the theoretical basis of curvature modal method for damage identification is introduced. Then, it simulated the structural damages by the use of three-dimensional finite element model, and used curvature mode to identification them validly. Based on the finite element simulation results, the following conclusions can be drawn: the decline of the structural natural frequency can be used to judge if the simply supported slab bridge is damaged. But the declined value is small, it is almost impossible to achieve in the scene, and it also can not be accurately positioning and quantitative; curvature model is very sensitive to the partly change of structure. It cannot be affected by the interference of the other plates, when the damage condition was identified on one plate of the simply-supported slab bridge even if that plate is adjacent plate would not affect it.
Study on System Reliability of Gravity Dam
Authors: Xu Qiang , Chen Jian Yun , Li Jing
Published: August 2013

Reliability analysis is an emerging field of structural engineering which is very significant in structures of great importance like arch dams, large concrete dams etc. The research objective is to design and construct a new method for the analysis of the system reliability of dam. The failure paths are searched out after failure mode and composite performance functions are set. Bayes formula and Cauchy-Schwarz Inequality are adopted to deduce the upper limit of failure probabilities in some failure modes that can obtain the failure probability of system of dam. A test example is given to verify this method. Compared with other conventional algorithm, this method has the strong points: more failure paths are considered and more safety methods are used to estimate the system reliability of dam.
Study on Mechanical Characteristic of Two-Layer Steel Plate Concrete Shaft Lining under Non Uniform Pressure
Authors: Cai Hai Bing , Cheng Hua , Huang Yi Chun
Published: August 2013

Aiming at the actual condition that non uniform pressure act on shaft linging, adopting finite element numerical simulation method, mechanical characteristic of two-layer steel plate concrete shaft lining is researched. Based on pertinent regulations of concrete strength improving coefficient in the state of triaxiality stress, designed twolayer steel plate concrete shaft lining meet strength need under non uniform pressure. The research findings can provide referrence for similar structure design.
Study on Reliability of Bracing Structure for Foundation Pit by Excel Optimization Algorithm
Authors: Liao Ying
Published: August 2013

On the basis of the theory of structure reliability, the optimization algorithm according to the geometric significance of the reliability index and the checking point method are studied to calculate the reliability of the bracing structure for foundation pit. Combined with a soil nailed wall engineering example, the primary data calculation table is established to solve the non-linear programming problem adopting the embedded planning solving method of Excel software and the results indicate that the reliability index and the coordinates of the checking point are same nearly using the checking point method and Excel planning solving method, but the latter is more efficient and convenient than the former, it means that it is feasible to calculate the reliability index of the bracing structure for foundation pit by Excel optimization algorithm.
Analysis of Transmission Tower Structure with Pushover Method
Authors: Qin Kang , Xu Zhong Gen , Deng Chang Gen
Published: August 2013

Pushover method is mainly used to find the weak part of the structure and possible failure modes. This paper presents a pushover analysis. Taking a transmission tower as an example, calculations are carried out by SAP2000 Program with assumption of rational criterion. Seismic loads of frequently met and rarely met seismic concentration degrees are considered. By comparing the structural target seismic performance and the sequence of plastic hinges induced, seismic performances of the transmission tower are estimated.
On the Nodes’ Anti-Crack and Load Bearing of SRHC Interior Joint with Different Axial Compression Ratios
Authors: Peng Jun , Zhang Dong Xiu , Zhang Jian Kang
Published: August 2013

By testing the seismic performance of the beams and columns of three SRHC with different axial compression ratios, the paper reveals the influence pattern of the nodes’ stress transfer and distribution, cracks’ appearance and development, member deformation, destruction pattern and mechanism, energy dissipation capacity etc., in SRHC with different axial compression ratios. The test shows that the increase of axial compression ratio postpones the appearance of the diagonal cracks in the nodes area, and slows down moderately the speed of development of the diagonal cracks, and improves the nodes’ energy dissipation capacity and ductility etc. this article studies its crack resistance and bearing capacity only. The purpose of this test is, through the low cyclic loading test of the nodes in the beams and columns of three SRHC with different axial compression ratios, to investigate the axial compression ratio’ influence on the cracks’ appearance, development, destruction pattern and deformation characteristics in the nodes; to analyze of the factors influencing the load-carrying capability; to validate the calculation methods proposed by related studies, which is little studied by foreign countries. This paper, based on the analysis of axial compression ratio test, further validates and improves the theory and methods proposed in the literature.
Buckling Analysis Method and Application of a Square Steel Tube Member with Initial Geometric Imperfection under Axial Compressive Load and Bending Moment
Authors: Niu Peng , Wang Xiao Chu , Jin Chun Fu , Zhang Yong Qi
Published: August 2013

Based on Ježek method of computing the elastic-plastic buckling of the member under the axial compressive load and the bending moment, considering the initial imperfection, the analytical expressions of calculating the ultimate load of buckling about the neutral axis with the maximum moment of inertia for a square steel tube member are derived. Using the elastic-plastic finite element method and the theory of nonlinear buckling, the impact by initial geometric imperfections on the square steel tube member under the axial compressive load and the bending moment are analyzed and the numerical solutions of ultimate bearing capacity are obtained. By compared with the values of the finite element method (FEM), it shows that the analytical method in this paper is valid. The results of the example show that the presence of initial imperfections reduces the ultimate bearing capacity of the steel member to a great extent. It is also found that the influence of the initial geometric imperfection on the ultimate bearing capacity of member is smaller when the M increases.
Parameter Influence Analysis of Stability for Suspendome Structure
Authors: Shi Kai Rong , Jiang Zheng Rong , Ruan Zhi Jian
Published: August 2013

Taking the new type hybrid structure of suspendome as the analytical object, its stability performance is studied in detail. Through the method of nonlinear buckling analysis, the influences of different parameters on the stability are systematically analyzed i.e. rise-span ratio, plane shape factor, prestress and length of strut. The results show that rise-span ratio, plane shape factor and length of strut have great effects on the structural stability while prestress has small effect.
Wind Loadings on the Low-Rise Buildings around the Hillside in Atmospheric Boundary Layer
Authors: Chen Jwo Hua , Chou Chin Cheng
Published: August 2013

A series of wind tunnel aerodynamic experiments were conducted to investigate the wind loads on the low-rise buildings located around the hillside. The result shown, the steep roof slope may cause a separation bubble at the edge and the small separation shear layer reattached the roof just near the edge due to the steep slope of roof at the uphill side. At the downhill side, the mean pressures of the building with gently slope roof to be positive for most of them. The building seems to be covered by the hill separation bubble, and the approaching flow with negative inclination acting on the buildings. The surface pressures of low-rise buildings may not reflect the local shear layer behaviors, but they shown the acting results of the wake of the hill. The fluctuating pressures distribution at low-rise buildings located at hillside would slightly less than the ones without hill.
Influence and Analysis on the Bearing Capacity of Reinforced-Concrete-Frame Node in Beam and Plate's Constraint
Authors: Yang Tai Hua , Yu Xiao , Gong Jian Wu , Tang Bin , Zhong Yang Zhi , Gong Xiang Chao
Published: August 2013

According to the domestic and foreign various building codes and a kind of limit fitting formula, to calculate and analyze the compressive bearing capacity of sandwich reinforced concrete beam-column nodes in a high-rising frame structure engineering, and to compare with the results calculated by Midas. They shown those are the facts that cant be neglected, the compressive bearing capacity of the sandwich node core area concrete in beam and plates constraint would improve and the amplitude of improving would be great. But current Chinese building codes haven't included them in the formal design provisions, these ways have to be perfected. In the same time, beam and plate constraint would also have a certain effect to the shear bearing capacity. By contrast, the shear bearing capacity in considering beam and plate constraint would increase 12% to 24%, it would get to 91% of the limit fitting formula calculation value when the short side was sheared, and it is 92% when the long side was sheared. That shown it is quite perfect in considering the effect of the orthogonal beam-plate constraints in domestic seismic code.
Bend-Bearing Capacity of Concrete-Filled Square Steel Tube and T-Beam
Authors: Wei Wei , Peng Liu , Wang Lian Guang
Published: August 2013

In this paper, considering the method of theoretical analysis, the state of strain and stress on each section of composite beam of concrete−filled square steel tubes and T−beam is studied in the process of bending. According to structural and mechanical characteristics of composite beam, elastic analysis method is employed for stress analysis, and the calculation equations of elastic bend-bearing capacity of simply supported composite beam is given. Then the calculation equations of plastic limit bend-bearing capacity is deduced according to the unified theory.
Experimental Research on the Thermal Damage of Concrete
Authors: Chen Chao , Luo Ying She , Tang Song Hua , Zhang Xuan
Published: August 2013

In order to investigate the effect of temperature (from normal temperature to 850°C) coursed by fire on the strength damage of concrete, thermal compression tests for concrete specimens named C35 have been performed under different temperature conditions. Emphasis is laid on the relationship between temperature and thermal damage strength; and the relevant formula is proposed in this paper. The regularity and mechanism of thermal damage evolution in concrete on strength under high temperature are analyzed. Combined the result of tests with the residual strength thermal damage model, we obtain the specific damage variable value D under different temperatures. Finally, we compare the fitting formula curve to relevant reference; there are some important conclusions which can be partly applied to fire design of concrete structure.
Mechanical Properties of Roller Compacted Concrete under Triaxial Stress State
Authors: Wang Huai Liang , Ren Yu Qing
Published: August 2013

Considering the true mechanical states of roller compacted gravity and arch dams, the strength experiments of the roller compacted concrete (RCC) specimens with two graded-aggregates made from a high arch dam are carried out. These specimens are of three kinds: body specimens, layer-treated specimens and layer-untreated specimens and the tests include direct shear and triaxial compressive-compressive-shear, tensile-compressive-shear tests. The shear strength of three kinds of specimens under different stress states is analyzed systematically. By regression of the tests results, respective failure criterions for RCC under different combined loads are proposed.
Push-Out Test on Shear Connectors Embedded in UHPC
Authors: Kim Jee Sang , Park Sang Hyeok , Joh Chang Bin , Kwark Jong D.K. , Choi Eun Suk
Published: August 2013

The various push-out tests have been performed to investigate the load carrying capacity and ultimate behavior of headed studs in UHPC (Ultra High Performance Concrete), which has high compressive and tensile strength as well as high durability compared to ordinary concrete. The test program included the studs with a diameter of 16mm and 22mm for various aspect ratios (height to depth ratio of a stud) and cover depths. This paper presents the main results of the experimental investigations.
Seismic Design of the High-Rise Building Structure and Sustainable Development
Authors: Ma Jing Yuan , Ma Fu , Hu Chen Suo , Wen Zhi Xian
Published: August 2013

This article summarized seismic design method of high-rise building from seismic fortification goal, use of materials, structural systems, analysis methods and trends. Then it discussed the structural design significance of high-rise buildings to achieve sustainable development. Lightweight quality, high strength material, diversity type, spatial component, braced lateral force resisting system, structuring combination and shock absorption building are the trends of high-rise building development.
Experimental Investigation on Flexural Bearing Capacity of Concrete Beams Reinforced with CFRP-PCPs Composite Rebars
Authors: Liang Jiong Feng , Hu Ming Hua , Deng Zhi Ping
Published: August 2013

The flexural behavior of concrete beams reinforced with CFRP-PCPs composite rebars was studied. Experimental results showed that the performance of CFRP-PCPs composite rebars beams is superior to that of CFRP beams at service and ultimate and comparable and even better than RC beams at service condition. Flexural cracks of concrete beams reinforced with CFRP-PCPs composite rebars are hairline before prism cracking, and they widen after the prism cracking Keywords: CFRP-PCPs, composite rebars, beam, flexural
Stiffness and Energy Dissipation of Steel Coupling Beam Embedded in the PSH2C and Normal Concrete Shear Wall
Authors: Kim Sun Woong , Park Wan Shin , Eom Nam Yong , Yun Hyun Do , Jang Young Il
Published: August 2013

Hybrid coupled shear wall with steel coupling beams has often been used as load-resisting system of high-rise buildings under lateral loads. However, joint between steel beam and shear wall is under combined and high stress. Reinforcement details of the joint are very heavy. This study addresses the effect of shear wall cement composites type in hybrid wall system on the seismic performance of steel coupling beams embedded in shear wall. The main test variables were the failure mode of steel coupling beam and types of cement composites, such as PSH2C and concrete, for shear wall.
Individual Anchored Strength Experimental Research for Prestressed End with Local Area Pressure
Authors: Pang Ping
Published: August 2013

Here individual anchored strength of prestressed end with local area under pressure was studied through experiment, the damaged mechanism of local area under pressure was discussed. The ferrule effect of peripheral concrete upon the concrete under local pressure loading is not obvious.
Temperature Field Analysis of Steel Reinforced Concrete Column in Fire
Authors: Chen Jian Hua , Ma Chao , Li Jian Hua , Qian Qin
Published: August 2013

In order to analyze the mechanical properties of the remaining carrying capacity of steel reinforced concrete columns after exposure to fire, full preparations must be needed. In this paper, the numerical simulation of the temperature field of steel reinforced concrete column section was being adopted the finite element analysis software MSC.MARC to analyze. Temperature distribution law of the column cross-section in the case of uneven fire was obtained. There has a nice agreement between calculation and original test data which created the conditions for high temperature and high temperature performance analysis for SRC columns
The Effect of Confinement Method and Specimen End Condition on Behavior of FRP-Confined Concrete under Concentric Compression
Authors: Vincent Thomas , Ozbakkloglu Togay
Published: August 2013

This paper presents an experimental investigation on the influence of confinement method and specimen end condition on axial compressive behavior of fiber reinforced polymer (FRP)-confined concrete. A total of 12 aramid FRP (AFRP)-confined concrete specimens with circular cross-sections were tested. Half of these specimens were manufactured as concrete-filled FRP tubes (CFFTs) and the remaining half were FRP-wrapped concrete cylinders. The effect of specimen end condition was examined on both CFFTs and FRP-wrapped specimens. This parameter was selected to study the influence of loading the FRP jacket on the axial compressive behavior. In this paper the experimentally recorded stress-strain relationships are presented graphically and key experimental outcomes discussed. The results indicate that the performance of FRP-wrapped specimens is similar to that of CFFT specimens and the influence of specimen end condition is negligible.
Axial Compression Ratio on Seismic Performance of CFPR Steel Tube Composite Columns Filled with Steel Reinforced Concrete
Authors: Xu Ya Feng , Wang Yue , Bai Shou Yan
Published: August 2013

To study the mechanical properties of CFPR steel tube composite columns filled with steel reinforced concrete under different axis compression ratio by adopting 3 specimens of theirs quasistatic tests are carried out. The failure mechanism and test results are analyzed with member of the load-displacement hysteretic curves, skeleton curves. The results show that the axial compression ratio decreases conducive to the improvement of the bearing capacity of specimens. Axial compression ratio has a great influence on the skeleton curve and ductility. Axial compression ratio is higher, the descent stage of the skeleton curve is steeper, the ductility is better. With the increase of the axial compression ratio, the ductility coefficient and energy dissipation capacity is lower.
Design Method on Shear Behavior of Single Tapping Screw Connections in Cold-Formed Thin-Wall Steel Structures
Authors: Wang Shen Wei , Wang Cheng Jiang
Published: August 2013

In order to investigate the design method of single tapping screw connections between steel plate and non-steel plate and the applicability of calculating the shear capacity of single tapping screw connections with sheet steel under 2mm according to Chinese code Technical code for design of cold-formed thin-wall steel structures(GB50018-2002),theoretical analysis was carried out on single tapping screw connections, which were distinguished by connection forms called steel plate-steel plate connections and steel plate-non-steel plate connections. The results show that: Chinese code GB50018-2002 is suited to calculate the shear capacity of single tapping screw connections with sheet steel under 2mm and the results are safe compared with test results. The design method of single tapping screw connections between steel plate and non-steel plate is given on the basis of test results.
Constitutive Relationship of FRP Reinforced Column Plastic Hinge Zone Based on Pushover Analysis
Authors: Sheng Guo Hua , Zhu Fu Sheng , Zhang Jun , Zhu Guang Shan
Published: August 2013

The formation and development of plastic hinge is the basis of the whole process of FRP reinforced concrete eccentricity compression and flexural member nonlinear analysis. The moment-rotation relationship of FRP reinforced rectangular column plastic hinge zone was studied. Its yield and ultimate moment formulas were proposed. The specific values of the moment and rotation were discussed in different modes of failure, retrofitting methods as well as FRP types. A constitutive relationship of FRP reinforced rectangular column plastic hinge zone was established. Based on the constitutive relationship, a pushover analysis of the numerical model is conducted, and the feasibility of its application in Etabs software through cases is verified.
Calculation of Load-Carrying Capacity of Square Concrete Filled Tube Columns Based on Neural Network
Authors: Gao Hua Guo , Cheng Hang , Cui Xiao Feng
Published: August 2013

Steel tube and filled concrete of square CFT columns under axial load are in complicated stress condition, the influence of every kind of factors on mechanics performance is difficult to ascertain accurately. On the other hand, neural network is good at obtaining the relationship between input and output variables by self-studying, self-organizing, self-adapting and nonlinear mapping. Therefore, it is suitable that use neural network to calculating the bearing capacity of square CFT columns. In this paper a three-layer back-propagation model of network is trained according to experimental data of square CFT columns under axial load, a neural network model for axial loaded square CFT columns is set up. The model is verified by six groups of experimental data, the results show the predicted values are in good agreement with test values, precision in calculation is good enough to be used as an auxiliary method for structure design.
Hysteretic Behavior of Reinforced Concrete Coupling Beams with Diagonal Headed-Bars
Authors: Park Wan Shin , Chun Young Soo , Yun Hyun Do , Seo Soo Yeon , Song Jin Kyu , Lee Hyun Ho
Published: August 2013

This paper addresses the seismic behavior of coupling beams with headed reinforcing bars in coupled shear wall system. Test variable included the replacement ratios of headed reinforcing bars. The results show that Specimen HB 50 exhibits a better stable behavior in comparison with Specimens Specimen CON and Specimen HB 30. Test results showed that the amount of diagonal reinforcing bars in the coupling beam may be reduced when headed reinforcing bars are utilized.
The Strength and Deformation Analysis on the Top Steel-Tube Truss Supporting System of Silo
Authors: Wang Tie Cheng , Wang Wen Xing , Zhao Hai Long , Li Qin Shan
Published: August 2013

The influence of diameters and loads on the displacement of truss supporting system is evaluated based on the results of the finite element analysis on the steel-tube truss supporting system of silo. The vertical displacement increases with the increasing of the load. The displacement increases with the increasing of the diameter in the same loads. The maximal displacement appears in the intermediate position of the truss, and the displacements of symmetric nodes are similar under the symmetric loads. The member yields before 30m of truss supporting system reaches the allowable deflection.
ANSYS Simply Supported Deep Beams Based on the Study of Mechanical Properties
Authors: Liu Yong Bing , Zhang Xiao Zhong
Published: August 2013

Established the mechanical model of simply supported deep beam, calculation and analysis of simple supported deep beams by using finite element analysis software ANSYS, simulated the force characteristics and work performance of the deep beam. Provides the reference for the design and construction of deep beams.
Design Method of Horizontal Braces Unlocated at Middle of Columns with Fixed-Ended Column Base
Authors: Zhao Jin You , Teng Shi Chang
Published: August 2013

A large number of column-bracing systems for the horizontal braces unlocated at middle of columns with fixed-ended column base were modeled and analyzed by second-order analysis using finite element method, in which the random combination of the initial imperfections between columns and horizontal braces was well considered by Monte Carlo method. According to the analysis results, two kinds of instability modes of column-bracing system have been found, probability density function of the horizontal bracing forces unlocated at middle of columns with fixed-ended column base is established based on probability statistics, and the design formula of horizontal braces unlocated at middle of columns are also proposed.
Finite Element Analysis of Wind Turbine Tower
Authors: Li Xi Le , Ren Li Min
Published: August 2013

In this paper, it was analyzed and summarized about load character, load calculation methods of wind turbine tower. A calculation for cone tower of 1.5MW wind turbine is taken as an example of finite element analysis, its static characteristic are given as well. It presents the maximum displacement and the corresponding maximum stress, and the strength of the tower is also calculated under various loads. The results show that: the finite element model is feasible in engineering application, the strength of tower under static load meet the requirements, will not occur strength failure.
Experimental Study on Behavior of Shear Walls Built with Precast Two-way Hollow Slabs for Different Axial-Load Ratios
Authors: Liu Ji Liang , Cui Hui Chen , Chu Ming Jin , Hou Jian Qun
Published: August 2013

The shear wall built with precast two-way hollow slab is an innovated precast concrete shear wall suitable for housing industrialization. Two shear walls built with precast two-way hollow slabs were tested pseudo-statically under low cyclic lateral loads to acquire their failure process and modes. The effect of the axial compression load was investigated. The study proved that vertical cracks along the vertical holes of the new type shear wall have been appeared to avoid brittle shear failure, and the shear wall developed integral section wall to walls-columns combination. As the results, the shear walls have the adequate deformability. The test results showed that with the increase of axial compressive ratio, crack development has been limited and the energy dissipation capacity has been improved. It also can be found that with the increase of the axial compressive load, shear capacity of the new type shear walls have been improved.
The Application of ABAQUS in Cast-Steel Joints Elastic-Plastic Analysis
Authors: Wang Fan , Luo Zhi Feng , Mo Sheng Hao
Published: August 2013

The article introduces the application of the large universally used finite element analysis software ABAQUS in elastic-plastic analysis of the cast-steel joints in building structure. Using the cast-steel joint of a large reticulated shell structure in Shenzhen as an example, the article explains how to import the joint model into ABAQUS and start the finite element analysis, and finally get the elastic-plastic analysis results, thus provide the reference for engineering design, analysis and optimize design of cast-steel joints.
Rationalization of Structural Stiffness of Offshore Platform with Rocking-Wall
Authors: Han Gu Yue , Jiang Zhi Wei , Nie Li Wu , Zhang Ji Gang
Published: August 2013

This paper presents a new offshore platform with rocking wall structure, and studies how to use the material more adequately by varying offshore platforms story rigidity. The results show that the greater the story stiffness, the more it can give full play to the material properties, as well as to improve the seismic capacity.
Experimental Study on Relationship between Half-Cell Potentials and Load Carrying Capacity of Corroded Reinforced Concrete Shear Walls
Authors: Cui Zheng Hua , Shen De Jian , Huang Cong Bin , Li Ming
Published: August 2013

This paper addresses the results of an experimental study on relationship between half-cell potentials and load carrying capacity of corroded concrete RC shear walls. There are four specimens in the test with the corrosion rate of 0%, 3%, 9% and 15%, respectively. Before and after the accelerate corrosion test, half-cell potential measurement was used to attain half-cell potentials. The horizontal load carrying capacity was attained under cyclic loading. Results show that load carrying capacity of corrosion damaged walls decrease with the increase of corrosion rate, as well as half-cell potentials. The relationship among corrosion rate, half-cell potentials and load carrying capacity is presented.