bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Probabilistic Identification Method of Structural Physical Parameter Based on Bayesian Estimation
Authors: Gong Mao Sheng , Li Xiao Hua , Gao Yan Bin , Liu Qi Fang
Published: July 2014

Base on the structural modal parameters, the linear regression models of physical parameters are derived from the dynamic equations. The posterior joint Probability Density Function (PDF) of physical parameters is obtained by using Bayesian statistics theory. Then the Markov Chain Monte Carlo (MCMC) sample method is adopted to get the marginal PDF and optimal estimation of structural physical parameters. A numerical simulation of a 5-stroy structure under the excitation of white noise with different noise level is used to identify the physical parameters by the presented method. It is shown that the method can not only determine the optimal estimate but also get the probability distribution of the structural physical parameters from the known modal parameters of the primary modes. The method is with higher validity, robustness and efficiency, and can be applied to the structural health monitoring, damage evaluation, and so on.
A Bridge Health Monitoring System Based on Wireless Smart Aggregates
Authors: Yan Shi , Ma Hao Yan , Jiang Xue Lei , Qi Bao Hui , Liu Fu Xue
Published: July 2014

Researches on health monitoring technology of concrete structures by using piezoelectric smart aggregates have achieved a great development. However, the technique is not widely used so far in practical engineering.   Because when constructing large-scale structural health monitoring (SHM) system using wire-based sensors, it requires a lot of cables to form a monitoring network, resulting in huge cost of abundant material of wires and labor for wire placement, and the relatively heavy maintenance work in case of failure of the SHM system. A kind of wireless sensor network based on the protocol for Zigbee802.15.4 and the passive piezoelectric smart health monitoring technology is developed in the paper. Through internal load monitoring tests of a concrete bridge model under impact loading, the developed wireless smart aggregate (WSA) health monitoring system is experimentally validated. The finite element method (FEM) is used to simulate the process as the same as the bridge model test, and the numerical results are consistent with those of the experiment. The experimental results show that the developed wireless system is stable and reliable, and can be applied in concrete bridge structure health monitoring under impact loading.
Application of Frequency Ratio in Structural Damage Detection
Authors: Liu Hong Biao , Zhang Qiang
Published: July 2014

In order to verify the feasibility and validity of frequency ratio as diagnostic parameter in structural damage detection proposed in the Musical Tone Law Method (MTLM), steel pipes and three-story steel frame structure model tests are carried out. According to the experiment results, it is clear that the diagnostic parameter is effective for symmetrical structure in structural damage detection, such as cable structure, framed structure, and so on. Model tests prove that the frequency ratio is effective in detecting the 3mm width crack damage of steel pipe. In the damage detection test of three-story steel frame structure, the parameter also successfully diagnosed the damage caused by bolts loosening at the node of model.
Research on Jack Top-Bracing Platform in the Subway Close-Attached Undercrossing Engineering
Authors: Li Ji Dong , Tao Lian Jin , An Jun Hai , Wu Bin Lin
Published: July 2014

It is great significance for the design and construction of similar beneath engineering to study the multiple pre-top bracing technology in the subway close-attached undercrossing engineering. In this paper,taking the Beijing 10-line New Gongzhufen station close-attached undercrossing the existing Subway Line 1 Station as background, explored the application of multiple pre-top bracing construction technology, and designed a new kind of top bracing platform system, studied the application of multiple pre-top bracing construction technology in the large span of close-attached undercrossing engineering.
Damage Detection Method Based on Fractal Correlation Dimension for Steel Truss Structure
Authors: Du Shou Jun , Shi Li Bin , Zhang Li Mei
Published: July 2014

Damage of steel truss structure can be determined by the sudden change of correlation dimension which was obtained from the structural vibration response through fractal theory. The streel truss structure was as exampled to verify this method. The results show that: this method can determine the damage location of the structure whether single damage or multi damage and can preliminarily judge the damage degree.
Experimental Study on Behavior of the Channel-Masonry-Concrete Composite Structures
Authors: Zhao Kao Zhong , Zhu Zhi Feng
Published: July 2014

channel - masonry - concrete composite structures underpinning is a new type of underpinning technology, the two channel steel and the concrete of compression flange and the masonry between the channel combined into an overall flexural members, it can used in masonry structure underpinning the transformation of the wall, it has simple construction, safety and reliability, the combination of large carrying capacity and other characteristics. Through this combination of three members in bending tests, we can get, reinforced by setting off key, channel, masonry and concrete can form a combination of flexural members to work together, channels tensile stress, concrete bear stress, masonry between the channel improved stability of the web and shear capacity of the beam, we gives the flexural capacity calculation method of the composite structure through analysis.
Identification and Treatment Suggestion of a Building Safety
Authors: Yu Chuan
Published: July 2014

Through the investigation, detection, analysis and study of cracks in concrete beam and concrete floorslab of a residential project in Shandong Province, this paper aims to determine the cracks type and the causes, and assess the impact on the project. Then, the appropriate and corresponding schemes for handling concrete cracks will be developed and for similar projects, this paper proposes some reasonable suggestions as well.
Finite Element Analysis of the Influence of Weld Size on the Combined Connection with Bolts and Welds
Authors: Ma Jian Suo , Bai Run Shan , Li Min Feng , Wang Yuan Qing , Wang Lei , Shi Yong Jiu
Published: July 2014

The combined connection with welds and bolds mainly refers to Interaction of weld and high-strength bolts. Both bolts and welds show influence on the performance of the combined connection. In practical engineering, because of limited joint size, only welds’ performence can increase bolts number or load. Therefore, it need to explore the influences of weld on joint performance. Moreover, for given determined bolt connection, it is necessary to discuss the influences of weld size, weld length and weld height, on the performance of a certain weld joint.
Research Progress and Overview of Pile Foundation Model Test
Authors: Wang Xin Quan , Zhang Shi Min , Liao Juan , Huang Ying Sheng
Published: July 2014

This paper expounds the model pile of various types and different loading measurement method, and introduces the model test of pile foundation; big full scale model test of pile foundation, pile foundation indoor common model test research and its limitations, this paper expounds the advantages and disadvantages of different test methods.
To Explore the Causes and Prevention of Cracks in Brick Masonry
Authors: Tong Zhi Neng
Published: July 2014

Brick masonry cracks only variety, shapes, and the phenomenon is more common, it may affect the beauty of buildings, resulting in infiltration Water Leakage, or reduce the bearing capacity, stiffness, stability and integrity, durability of building structure, but also can lead to an overall collapse of serious quality accidents. Therefore, the correct analysis of the reasons of cracks, puts forward the prevention measures is very necessary.
Cable Corrosion Analysis and Damage Monitoring
Authors: Guo Yi Lin
Published: July 2014

Cable corrosion is a serious problem in cable-stayed bridge. The paper analyzes the reason of cable corrosion and introduces the method of damage monitoring and detection.
Rigid Joints Transferring Forces outside Box Columns with Imperfect Beams – Finite Element Method Simulation
Authors: Liang Guang Xian , Xu Zhong Gen , Chen Wei Ming , Deng Chang Gen
Published: July 2014

In the process of steel structure construction, it was inevitable that the members of structure had initial imperfections which might decrease capacity of the structure. In order to consider the influence of lateral deviation of beams on rigid joints transferring forces outside box columns, in this paper 4 specimens were designed to compare the performance of joints with force-transforming plates to traditional joints by finite element method program ANSYS. The results indicated that adding force-transforming plates could transmit stresses to beams which were far from the panel zone, to avoid joints’ stress concentration. Moreover, in the same case, when the beams were imperfect, the yielding capacity and ultimate carrying capacity of the joints with force-transforming plates were significant higher than those of traditional joints. Moreover, the adding force-transforming plates were helpful to reduce the influence from the beams imperfect. This kind of joints can be used to the practical engineering.
Experimental Study on Cracking Load and Ultimate Load of Masonry Walls with Window Openings Strengthened with Sprayed GFRP
Authors: Sun Cheng Fang , Zhang Xiao Yan , Gu Qian
Published: July 2014

A contrast investigation of the seismic behavior of unreinforced masonry walls with window openings strengthened with Carbon Fiber Reinforced Polymer (CFRP) sheets and sprayed Glass Fiber Reinforced Polymer (GFRP) is presented. Three wall specimens in the scale of 1/2 were tested by the horizontal cyclic loading combined with constant gravity loads. The seismic strengthening effects by two different FRP retrofitting schemes are compared in aspect of the failure modes, shear capacity, hysteresis response, deterioration of rigidity and ability of energy dissipation. The experimental results indicate that the increasing degree of shear capacity and the improvement of seismic behavior of the SGFRP-strengthened wall are significantly superior to that of the wall strengthened with epoxy-based CFRP; and the overcoat of sprayed GFRP can bond tightly and work well together with the masonry to play a critical role in earthquake resistance.
Research for Project on Adding Layer of Building
Authors: Zhang Chun Mei , Liang Li Juan , Huang Chao
Published: July 2014

It is the initial problem to choose a reasonable layer-adding project in the layer-adding design for buildings. This paper is to prove, through living example, that choosing the truss structure between layers possesses well economical efficiency, and features space saving, ease of construction and good function of anti-earthquake at seismic regions.
Cement-Free Mortar Using Ground Granulated Blast-Furnace Slag with Different Alkali-Activators
Authors: Park Joon Woo , Hong Sung In , Yang Hee Jun , Lima Thamara Tofeti , Ann Ki Yong
Published: July 2014

The present study concerns a development of cement-free concrete using ground granulated blast-furnace slag (GGBS) with alkali-activators such as KOH, NaOH, and Ca (OH)2. To find out the development among three different activators, the concentration of hydroxyl ion was kept 0.5%, 1.0%, 1.5%, 2.0% and 3.0% by weight of binder irrespective of cations. The setting time was measured by penetration resistance immediately after casting of mortar. The development of compressive strength was measured at 7, 14, 28, and 91 days. The pore structure of cement-free mortar was examined by the mercury intrusion porosimetry (MIP) and rapid chloride penetration test (RCPT). Simultaneously, grew sample was used to microscopically observe at the XRD. For strength of cement-free mortar, mixed with KOH or NaOH was as high as OPC at 3.0 % by weight of binder. However, the compressive strength of cement-free concrete mixed with 3.0 % Ca (OH)2 by weight of binder had just half strength of OPC mortar. Cement-free concrete activated with NaOH and Ca (OH)2 had higher total pore volume, however, it had lower ionic penetrability due to the pore type which mostly consist of gel pores. For pore structure of cement-free mortar mixed with KOH, the total volume had similarity to that of OPC mortar, however, it had lower penetrability. Therefore, it may have higher resistance to chloride transport than that of OPC mortar.
Analysis of Concrete Corrosion and Damage Mechanism under the Actions of Multiple Salts and Dry-Wet Cycles
Authors: Su Xiao Ping
Published: July 2014

On the basis of concrete durability experimental results under the actions of multiple salts and dry-wet cycles, the internal microstructures of concrete subjected to the corrosion damage are studied in this article. The EDX energy spectrum analysis and chemical composition determination are discussed, and the concrete corrosion mechanisms under the actions of multiple salts and dry-wet cycles are studied further. The results indicate that the internal microstructures of ordinary concrete and fly ash concrete in the multi-salt solution are loose and porous after dry-wet cycles. There are a lot of crystals gathering in the concrete cracks. Through the EDX energy spectrum and chemical composition analysis, the main composition in them is CaCO3, doping with a small amount of Na2SO4, Na2CO3, or NaHCO3, etc. While the internal structure of air-entraining concrete is not only relatively dense, but also corroded by multiple salts. Under the condition of dry-wet cycles, the concrete damage by salt corrosion is a complicated process which including both chemical attack and physical function, and the damage speed and degree to crystallization corrosion by salts is quicker and even more serious than that of the chemical erosion.
Application of SAP2000 API and .NET Framework for Reliability Assessment of RC Structures
Authors: Chen Qing Jun , Liu Da Xin , Khan Inamullah , Cai Jian , Bai Fan
Published: July 2014

Based on the results of integral structure analysis, a practical program for the reliability analysis of the members is introduced for engineering application. The .NET framework and SAP2000 API were combined to develop this program. The probability distribution parameters of the load and the material are the input parameters and then based on the integral structure analysis results, by combining the Monte Carlo simulation methods and the JC methods, the probability distribution of the load effects and the resistance of the members can be calculated, thus the reliability indices of each member could be obtained. Furthermore, an example was introduced and the comparative study between this proposed method and the conventional method for evaluation of a structure was carried out. The results show that it is a feasible method to evaluate the bearing capacity of a structure by exploiting reliability indices directly and this method can offer more quantitative reliability indicators of the structures.
Revision for Concrete Members Crack Control Criteria Based on Durability Demand
Authors: Li Yang
Published: July 2014

Based on Monte Carlo method, the concrete durability reliability indexes for typical concrete members in 50-year-period of service were calculated under normally moist environment conditions. By taking the typical concrete members under normally moist environment conditions as example, the fuzzy reliability indexes based on durability for crack control criteria provided in GB 50010-2010 were calculated. The calculation results show that the durability reliability indexes are mainly lower than crack control reliability indexes for normally moist environment conditions. To realize the goal that the durability design safety level can be generally closest to crack control safety level, one revision advice was presented for present concrete design code GB 50010-2010 to properly lower the crack control safety level in normally moist environment conditions: the present short period crack width enlargement coefficient should be multiplied with 0.85 so that the calculation guarantee rate will be lowered to 85% for flexural members.
Analysis of the Implied Reliability Index and Load and Resistance Coefficients for China’s Current Highway Bridge Load-Carrying Capacity Evaluation Code
Authors: Leng Yan Ling , Zhang Jin Quan , Jiang Rui Nian
Published: July 2014

China’s current load-carrying capacity evaluation code for highway bridges is a semi reliability-based code. The reliability level of the code is analyzed through a comparative study, and methods used to update the reliability level of this code are specified in this paper. A formula to calculate the implied reliability index is proposed and verified by comparison with calibrated reliability indexes in design codes. Then the formula is used to calculate the implied reliability index with statistical parameters derived from the load and resistance coefficients in the current code. It is proposed that the implied reliability index should be adjusted by considering historical failure rates. Different criteria used to define historical failure rates of highway bridges are discussed. In addition, the paper compares the reliability level, applicability, evaluation frequency, target reliability indexes, and resistance and load coefficients between AASHTO and China’s current code. The paper would serve as a reference for the upcoming research on the updating of current highway bridge Load-carrying capacity evaluation code.
Modelling Pore Structure of Cement Based Material According to Continuous Network System
Authors: Hong Sung In , Park Joon Woo , Jung Young Hee , Ann Ki Yong
Published: July 2014

In this study, a modified pore structure of cement based material with respect to a path for ingressive ions was established. Of pores in a concrete, gel pores and other entrapped air voids were excluded from modelling the pore structure as no interests are given due to the ions immobilization of cement paste media. To setup the pore structure, the linear traverse method (LTM) was used to distribute air voids along the traverse line in a hexahedron cement paste structure, followed by including entrained air voids to fill up the least space of the cement matrix and making a network of the air voids through capillary pores at the variation in the diameters. Then the mercury intrusion porosimetry (MIP) was used to iteratively approach an accordance rate with calculated one from the above way to get into appropriate convergence value. As a result, for the OPC specimen the developed model shows a somewhat relevant value of 42.4 % of the accordance rate compared to empirical one and 64.24 of the ratio of ionic path to original distance within a concrete.
Out-of-Plane Stability Analysis of Plane Tubular Trusses
Authors: Huang Zheng Hua , Zhang Qi Lin
Published: July 2014

To carry out of out-of-plane stability analysis of plane tubular trusses, nonlinear finite elements model based on spatial beam elements and simplified connection elements is deduced. To verifying the feasibility of the simplified joints stiffness model, numerical examples are build and results shows that the simplified finite elements model is comparatively accurate , and could be used in engineering design.
Analysis on Safety Assessment of Reinforced Concrete Members
Authors: Tong Zhi Neng
Published: July 2014

This paper introduces the safety appraisal of buildings, how to identify the crack, crack, crack control analysis, is an important work of safety appraisal; and based on the crack causes and characteristics, determine the structure stress conditions, evaluate the structure to make the applicability and durability, security appraisal conclusion.
Analysis on Axial Compression Ratio to Strong Column Weak Beam Effect in Framework Node
Authors: Wen Xin , Hao Ze Jing , Wang Xing Guo
Published: July 2014

Nodes of Column ends, included ordinary Intermediate nodes and nodes in the model of carbon fiber, have been established based on finite element program, have analyzed the comparison of the deformation, bearing capacity, ductility in Quasi static state under three conditions of axial compression ratio reinforcement (0.2, 0.4, 0.6) between reinforcement nodes and ordinary nodes, have researched the impact caused by the change of axial pressure ratio on seismic performance of node, The result have shown that size of the axial compression ratio and bearing capacity of reinforced nodes follow basic plastics performance, but ductility of nodes in low axial compression ratio is more effective.
Research on the Equivalence and the Mechanical Performance of the Model of Steel-Concrete Joint
Authors: Yao Ya Dong , Pu Qian Hui , Yao Chao Yi
Published: July 2014

The hybrid girder cable-stayed bridge of railway has been applied in the design of the Yongjiang Bridge, it is first used in our country as yet. The mechanical performance of the steel-concrete joint as the key position of the hybrid girder cable-stayed bridge determine its safety and durability. Based on the background of a bridge in Zhejiang Province , the spatial finite-element model of model and actual bridge is developed to study the mechanical performance and verify the feasibility of design method of the model. As it turned out, the model can better reflect the stress of actual bridge. The trend of the stress of the key plates of its is basically identical. The steel-concrete joint can perfectly accomplish the transmission of the stress function. Bearing plate plays a vital role in the stress transfer, the function of the PBL shear connector near the bearing plate is obvious.
Tests on Shear Studs Using Profiled Steel Sheeting Subjected to Cyclic Loading
Authors: Fan Jian Sheng , Liu Wen
Published: July 2014

Push-out tests were conducted to study the performance of shear studs in composite beams with profiled sheeting. All stud specimens were through-deck welded on steel beams. Three variables, i.e. the presence of profiled sheeting, the direction of the steel sheeting and the loading patterns were studied. Comparison between test results and predictions according to design specifications were also proposed. The research shows that, direction of the profiled steel sheeting has little influence on the ultimate load with shank shearing failure; shear failure of concrete rib decreases the shear strength; and the shear resistance of a parallel concrete rib is about twice of a transverse one.
Application of RPC Constitutive Model in FEA
Authors: Yang Ke Jia , Xie Zi Ling , Li Wei
Published: July 2014

The damage evolution equation of RPC is established based on 2-parameter Weibull distribution. The constitutive relation of RPC is then calculated based on the damage evolution equation. The constitutive model of RPC is optimized by comparing experimental constitutive curve to models corresponding to different threshold strain. Based on the definition of damage index in ABAQUS, the damaged evolution equation in ABAQUS is recalculated based on the optimized constitutive relation. the concrete damaged plasticity model in ABAQUS is obtained using the aforementioned method. And the concrete damaged plasticity model is applied to three compression member and three simply supported beams with different reinforcements. The calculated stress-strain curve and deformation of three compression member and three beams is in accordance with the deformation characteristics of experiments, which verified the effectiveness of the proposed concrete damaged plasticity model of RPC.
Finite Element Analysis of Recycled Concrete Filled Steel Tube in Bending State
Authors: Li Bing , Meng Shuang , Wang Wei Hao
Published: July 2014

The objective of this paper is to provide the references through finite element analysis for steel tube concrete beams bearing capacity settlement. The paper verified the correctness of the constitutive relation of concrete, the correctness and the model through the establishment of the concrete damaged plasticity model with recycled concrete details in the finite element analysis software ABAQUS. Then the stress characteristics of steel pipe concrete beam in bending condition under different substitution rate could be found through model calculation. The result is that the mid span bending - strain curve from simulation agreed to the experimental results, and the model is proved correct. Finally it came to the conclusions. Other things being equal, the recycled concrete filled square tube changed a lot in bending state when the substitution rate grows, but it didn’t occur to the circular one. In the meantime, the writer proposed the conjecture on the bearing capacity calculation of the two types of structure.
Seismic Behavior of the Joints of Rectangular Steel Tubular Columns Filled with Steel-Reinforced Concrete and H-Shaped Steel Beam in Different Beam Strengths
Authors: Xu Pi Yuan , Zhu Shao Jie , Xu Ya Feng
Published: July 2014

In this paper, the finite element analysis software ABAQUS is used to study the seismic performance of the joints of rectangular steel tubular columns filled with steel-reinforced concrete and H-shaped steel beam in different beam strengths, which are under the same axial compression ratio of 0.2. By the finite element simulation, we can get the load-displacement curves and skeleton curves from the end of H-shaped steel beam. According to the curves and dates, the seismic performance of the joints is analyzed. The shape of each restoring force curves presents for full square spindle, reflecting that the beam-column structure can effectively absorb the seismic energy; with the enhancement of H-shaped steel beam’s strength, the ultimate bearing capacity of the structure is gradually increasing, however, the stiffness and overall stability of the components become worse by degrees; the change of ductility property about the joints is not obvious, showing good seismic performance.
Analysis of Wind-Induced Vibration Response for a Long-Span Double-Arch-Support Steel Structure
Authors: Chen Lan , Yin Bo , Huang Zhi Guang
Published: July 2014

As a new long-span double-arch-support steel structure system is applied to a stadium, it is necessary to study the wind-induced vibration response of the roof structure to meet the need of design. The modal analysis and the response analyses which include static wind response and wind-induced vibration response are calculated by ANSYS. The results show that the natural vibration frequency of structure is intensive (0.93 Hz~4.2 Hz). The most unfavorable wind direction angle of 135o is selected to study the wind-induced vibration response. And the wind-induced vibration coefficient calculated is satisfactory when compared with the wind tunnel test. It can be seen that it is feasible to use the stochastic simulation analysis method of wind-induced vibration response to get the wind-induced vibration coefficient.
Experiment on Seismic Behavior of Frame with Specially Shaped Columns Used Wide Flange in the First Floor and General on the above
Authors: Zhang Xue Hui , Ke Shu Ling
Published: July 2014

Studies show that the stiffness of the first floor column about concrete frame with general specially shaped column is insufficient, the column bottom will be compression damaged easily, the author advice using wide flange specially shaped column in the first floor to enhance the stiffness, so this paper designed a 1/3 scale RC frame with specially shaped columns used wide flange in the first floor and general on the above, furthermore the height of the first floor was higher than other floors. Then low frequency cyclic loading was experimented to the concrete frame, the seismic behavior of this kind frame such as damage characteristic, failure mechanism, bearing capacity, deformation capacity, hysteresis curve and storey drift were researched. It was shown that the seismic behavior of this structure was generally good, the method that changed the first floor to wide flange specially shaped column for concrete frame with specially shaped columns could enhance the stiffness of the first floor clearly, meanwhile the seismic behavior of the frame were improved.
Experiment Study on Deformation Properties of Composite Shear Wall Combined with Cement Formwork and Concrete under Static Load
Authors: Song Xiao Ruan , Zhu Xiao , Zhang Xiao Yun , Wang Yong Mong , Yan Chao , Xu Song Bing
Published: July 2014

A structure type of composite shear wall is presented, the both sides of which are reinforced cement composite layer and the middle layer of which is concrete. In order to verify the cooperative work performance of cement-base composite layer and concrete, static load tests were carried out. In the test, the deformation properties of composite shear walls and the development law of the strain of concrete and steel were studied. Meanwhile, a normal shear wall with the same conditions was tested and the corresponding natures of two types of shear wall were contrasted and analyzed. The test results prove that the composite shear wall has a good overall deformation behavior, and can, to some extent, slow down the process of wall stiffness degradation. The research production has provided a foundation for the further exploration to the working properties of the composite shear wall under cyclic loading.
Experimental Study on Anchorage Performance of Chemical Adhesive Steel Bar in Concrete
Authors: Shi Li Zhong , Zhang Jian Rong
Published: July 2014

This paper describes the behavior of adhesive anchor under pullout load. By measuring steel slips and strain distribution under different loads and observing the damage process of the specimen, the failure modes of anchors, mechanism of bonding and bond stress distribution are investigated and discussed. The study laid the foundation for determining the constitutive relationship of bond slip.
Optimum Design of CFG Pile Compound Foundation Based on Numerical Simulation Method
Authors: Cao Hai Ying , Liu Yun Fei
Published: July 2014

Aiming at the phenomenon of empirical selection in CFG pile compound foundation's design parameters, the computational models considering different pile length were built by numerical simulation software PLAXIS, whose background came from an actual highway engineering. The relation curves were plotted and analyzed concerning pile length with subgrade horizontal deformation, subgrade settlement, integral stability of embankment and end bearing force of pile, in the light of deformation and stress cloud graphs from post-processing results. The feasibility of pile length optimization in conventional design was judged synthetically according to above mentioned curves, and the optimized pile length was 2m shorter than the one of conventional design, which cut down construction cost. The construction practice indicates that there are not abnormal occurrence in subgrade treatment section during period of traffic operation.
Discussion on Limit Values of Axial Compression Ratio of Steel Reinforced Concrete Columns
Authors: Li Yun Yun , Yang Bao Sheng
Published: July 2014

Through the experimental test, influences of axial compression ratio on seismic ductility of SRC columns are analyzed. The limit values of axial compression ratio of the columns are obtained, corresponding to different stirrup ratios at a certain level of displacement ductility.
Numerical Simulation of Prefabricated Frame-Shear Wall Structure with Keyway Connection of the Column to Wall under Unidirectional Horizontal Load
Authors: Zhao Wei Jian , Guo Ye Nan , Tong Jia Xin , Yuan Shen Ming
Published: July 2014

To study on the property of the column to wall connection in the prefabricated frame-shear wall structure, these four connection ways are introduced in the article, which are U-shaped ,double straight ,chain buckle, double straight vertical U-shaped bar splicing. Using ABAQUS to simulate, comparing results of four connection ways with the cast-in-situ concrete structure. The results show that mechanical properties of four prefabricated structures are similar to the cast-in-situ structure, but the maximum bearing capacities are reduced.
Wind Tunnel Test on Wind-Induced Aerodynamic Force of Transmission Tower
Authors: Shan Wen Shan , Li Bo , Yang Jing Bo , Liu Yang
Published: July 2014

Wind-induced aerodynamic force is the important parameter for transmission tower design. Based on force balance test, the tower and cross arm of typical 500kV power transmission tower have been investigated in wind tunnel using three wind speeds considering Reynolds effect. The test results show that the shape coefficient keeps the same at different wind speed, which means that Reynolds effect on transmission tower can be ignored. Then, the shape coefficients of tower and cross arm are provided.
Dynamic Characteristic Analysis of Prefabricated Houses of Light-Weight Steel Structure
Authors: Xu Hui Min , Li Yang Yang , Xu Wei
Published: July 2014

Prefabricated house is a new kind of temporary structure. It has the advantages of extensibility and diversity, and it is also easy to assemble and disassemble. This paper performed the dynamic characteristic test of 4 prefabricated houses of light-weight steel structure on the site by using SVSA, and got the natural frequencies, damping ratios and vibrational modes of these structures. To study the effects of infill walls to the dynamic characteristic of structures, two different modes were built. By comparing the results of numerical evaluation and actual data, the paper analyzed the dynamic characteristic of prefabricated houses of light-weight steel structure. Analysis suggests that the vibrational modes of prefabricated houses of light-weight steel structure are in shear shape, and the damping ratios are between 0.6% and 2%. The infill walls and the pull rods between columns can shorten the natural period of structures, so the computation period should be reduced in the aseismatic design.
Finite Element Analysis of Anti-Seismic Performance of Flange Connection in Circular-Pipe Tower Structures
Authors: Shen Zhi Rong , Zhang Can , Xi Pan
Published: July 2014

For tower structures located in high-intensity seismic zone, despite the importance of anti-seismic performance in flange connection, far less attention has been given to it. Based on finite element analysis results carried by ANSYS software, under pressure and moment, influence of stiffener height and axial compression stress ratio of steel pipe on the anti-seismic performance of flange connection was studied. The main results shows that lower axial compression stress ratio of steel pipe or higher stiffener height would improve the anti-seismic performance of flange connection. And closer flange connection from the end restraint would lead to better anti-seismic performance.
A Shape Optimization Based on Strain Energy for Framed Structures
Authors: Jiang Bao Shi , Hu Jun
Published: July 2014

A shape optimization method based on strain energy is proposed for framed structures. This method combines free nodal shift, or restricted nodal shift on a specified line in the structural geometry. The optimization is based on nodal sensitivity information to amend the structural shape to achieve a structure with minimum strain energy. In this method, the design parameters, such as initial structure, supporting conditions, spatial constraints, etc, have significant influence on the final structural form; so various structural forms can be obtained by changing these design parameters in the project design phase. A numerical example is provided to illustrate the validity of this method and the mechanical behaviour of the structure. Results show that this can effectively reduce the structural bending moments and ensure sufficient structural stiffness.
Comparative Analysis of Different Modeling Methods for Sandwich Plates Based on LS-DYNA
Authors: Zhu Zheng , Wang Jun Jie
Published: July 2014

Based on LS-DYNA, this paper compares four modeling methods for sandwich plates, e.g. the layered shell element, the solid and shell mixing element, the shared-node shell element and the thick shell element. Four modeling methods are used to simulate sandwich plates with different thickness-to-span ratios and different mesh sizes. The comparative analysis of the relationships between the mesh size, the CPU time and the convergence rate of the accuracy of four methods shows that the layered shell element and the shared-node shell element can accurately simulate sandwich plates with high efficiency.
Experimental and Theoretical Studies On High-Rise Building Structure With New Special-Shaped Shear Walls
Authors: Liu Jian Xin , Li Pei , Shen Jie , Zhu Mei Chun
Published: July 2014

On the basis of concept design that involves both structural and architectural performance, this paper puts forward a new reinforced concrete high-rise building structure with a new special-shaped shear walls, presents an experimental study of the seismic performance of the new special-shaped shear walls under low reversed cyclic loading using MTS electro hydraulic servo system. Compared with experimental results, a finite element analysis on this special-shaped shear wall structure, which considers the nonlinearity of concrete structure, is found suitable. It shows that the experimental results fairly confirms to the calculated values, which indicates that this new structure has advantages as good architectural function, big effective space, high overall lateral stiffness, fine ductility, advanced seismic behavior, etc.. That is, the close agreement between the theoretical and experimental results indicates the proposed shear wall structure has wide applications.
Experimental Research on Integral Structures of Mobile Steel Buildings
Authors: Zhang Zheng , Cai Xue Feng , Ma Yong Chao , Zhou Ji Zhong
Published: July 2014

Static tests were conducted on a two-story mobile steel building under wind loads, and the building is made of two box units of steel frame structures with light composite wall panels. The mechanical behavior and the deformation properties of the structures were investigated. Based on the static equivalent principle, the lateral loads applied to load points of the top of the columns were imposed to simulate wind loads. The displacement values and the relative shifting values of the integral structures were received. The tests results show that the lateral deformations of the mobile buildings are greatly affected by the relative movements of both the box units.
Finite Element Analysis of Unbonded Prestressed Concrete Silos
Authors: Xu Guang Shu , Liu Huan Qin
Published: July 2014

in this paper, making coal storage silo that diameter is a 120 m as the background, researched warehouse wall and pile caps using finite element method. In articles, the finite element analysis of soil, study the influence of prestressed reinforcement about prestressed effect, the structural response analysis under different stack forms and seismic analysis. The results show that: inside and outside temperature difference makes maximum stress, full load can reflect the other coal pile forms, the ability of resist the earthquake is strong.
Ultimate Bearing Capacity Analysis of Oblique Beam System Supported by Knee Brace
Authors: Xu Le Huan , Liu Feng , Meng Shuang Shuang
Published: July 2014

This article established the oblique beam system supported by knee brace in portal frame by using finite element software ANSYS. We analysed the ultimate bearing capacity of the system, and discussed the effects of purlin stiffness and knee brace layout on the bearing capacity of the structure. Preliminary analysis shows that, increasing the number of knee brace or improving purlin stiffness can improve ultimate bearing capacity of the system.
Analysis of Influencing Factors on Mechanical Behavior of Laminated Slab with Shear Connectors with Four-Terminal Fixed Constraints
Authors: Zhao Wei Jian , Wang Li Guo , Chen Ji Guang , Li Ming
Published: July 2014

In order to solve the problems in current laminated slabs among prefabricated structure, a new kind of laminated slab with shear connectors (LSSC) is proposed. In the previous study, the force behavior of it is analyzed. In this study, how the main factors influence the force behavior of them are analyzed to provide a basis for designing. LSSC with different influencing factors are designed, including area percentage of shear connectors, friction coefficient and length to width ratio, and their loading process is simulated by using finite element software ABAQUS. The corresponding load-deflection curves are also extracted. By comparing these curves in diagram, the following conclusions can be gotten: the area percentage of shear connectors and the length to width ratio are the important factors that influences load-deflection curves; yet the effect of the friction coefficient on the load-deflection curves is not obvious.
Analysis of Influencing Factors on Outer Annular-Stiffener Type Steel Castellated Beam-Concrete Filled Steel Tuber
Authors: Li Ming , Wen Yu Ting , Zhao Ming , Zhang Hai Yang , Yu Qing Xian
Published: July 2014

In order to provide a basis for designing outer annular-stiffener type steel castellated beam (OATSCB) - concrete filled steel tube (CFST) joint, the factors that influence the load-displacement skeleton curve of this kind of joint is analyzed. OATSCB - CFST joint with different influencing factors are designed, and their loading process is simulated by using finite element software ABAQUS. Before simulating, the simulating method is verified by previous test result. The corresponding load-displacement skeleton curves of those joints are also extracted. By comparing these curves in diagram, the following conclusions can be gotten: OATSCB - CFST joint has good seismic performance; steel yield strength, steel ratio and beam to column linear stiffness ratio are the important factors that influences the skeleton curve of this type of joint; opening rate is an important factor for this type of joint to form "strong column weak beam" yield mechanism.
Analysis of Static Strength for Tubular Joint Reinforced with Collar Casing Pipe
Authors: Song Sheng Zhi , Wei Jian Jun , Sun Wu
Published: July 2014

To improve the static strength of tubular T-joint, the method of reinforcing with collar casing pipe is proposed. The finite element analysis (FEA) models of reinforced and unreinforced tubular joints built by FEA software (ABAQUS) are calculated to investigate the improving efficiency under axial compression and tension. It is found that collar casing pipe can improve the static strength of tubular joint effectively. Afterwards, based on the mechanism analysis of tubular T-joint models, the failure modes and different performances between reinforced and unreinforced models are clarified.
Comparison Analysis of Evaluation Criterions for Vibration Serviceability Induced by Wind Load
Authors: Lin Hong , Liu Jixiong , Liu Ming , Wang Guo Bo
Published: July 2014

Vibration serviceability under wind load is always one of the crucial problems for the structural design of high-rising buildings. The most often used evaluation criterions in the world are compared and analyzed systematically in the paper. The features and shortcomings are pointed out, and some advices are proposed. The research can provide references for the improvement of evaluation criterion in China and vibration serviceability evaluation for high-rising buildings.
Finite Element Analysis of Friction Coefficient on Recycled Concrete Wall-Beam Interface
Authors: Zhang Min , Zou Chuan Long , Fu Xiao Jian
Published: July 2014

Mechanical testing on the first group of ordinary brick wall-beam and second group of recycled brickbat concrete wall-beam, measured its ultimate load and the maximum deflection, establishing finite element model to analyze, and comparing with the test results. It will be show that under the action of ultimate load, friction coefficient between the upper-wall of the wall-beam and joist can be desirable between 0.35 ~ 0.45, and the friction coefficient of recycled concrete wall-beam is bigger than ordinary wall-beam, and the higher the intensity of the upper-wall is, the bigger its friction coefficient is, as well as the greater stiffness of the wall-beam is.
Finite Element Analysis on Steel Frame Structure of Mobile Buildings
Authors: Cai Xue Feng , Zhang Zheng , Ma Yong Chao , Zhou Ji Zhong
Published: July 2014

Mobile steel building is a prefabricated building built in a factory, with advantages on moving conveniently, simple structure and scalability. For mobile steel buildings there are still not enough researches on the mechanical properties and mechanism of action, and there are still not enough relevant standards and requirements to conduct the design and construction of the buildings. In order to precede to theoretical study on steel frame structure of mobile buildings a method by Finite Element Analysis was proposed. This method is based on FEA software, Ansys. Using this method a two-story frame structure model was analyzed. The calculation results of lateral deformations under design loads by FEA were obtained and discussed.
Mechanical Behavior Research on the Double Angle Bolts Tube-Plate Joints of Concrete-Filled Steel Tubular Lattice Wind Turbine Tower
Authors: Wen Yang , Liu Shu Tan , Xia Gong Ke
Published: July 2014

Through the experiment of the six node models, this article obtained the axial force-deformation curves of the web members, the equivalent stress distribution curves under different loads of the tower within the scope of the node plate length. The result shows that: the stress level in the node area increases with the growth of the radius-thickness ratio; the node without stiffening ribs prone to appear node plate out-of-plane buckling with a lower carrying capacity, and the pillar got a higher stress concentration at the front end of the node plate; while the exists of the stiffening rib can not only improve the bearing capacity of the tube plate nodes, but also avoid the early out-of-plane buckling of the node plate, the failure mode of these node is compression web member buckling failure, meanwhile, the distribution of the tower equivalent stress at the node area gets much more uniform. It follows that, the bearing capacity of the node is not only associating with the thickness of the node plate and the radius-thickness ratio, but also suffering the important influence of stiffening rib.
Design and Application of Rock Bolt Foundation in Mountain Cable Crane
Authors: Lei Jin Sheng , Cao Xue Ting , Zeng You Wei , Liu Fei
Published: July 2014

Restricted by the construction environment, the cable crane is an effective means to resolve the transportation of materials and component in the mountainous area. Compared with traditional gravity anchor base, cable crane fixed on the rock bolt foundation can take advantage of the bearing capacity of bedrock, and the construction method is simple and of good economic benefit. With the effect of the construction methods, design theory of geological conditions, and other factors, however, force calculation is much complicated. By analyzing the failure modes of rock bolt foundation, anchor foundation bearing capacity factors and multi anchorage effect on anchoring force, we studied the design process of rock bolt foundation, geotechnical strength parameters and the safety coefficient of reference value. Further, a construction way is proposed to improve the basic bearing capacity of rock bolt. Combing with engineering examples, we also demonstrated the security and reliability of the design method .