bluuebunny/crossref_metadata_2025 huggingface dataset:
Unification of Hoek-Brown Criterion on the Basis of United Strength Theory
Authors: Li Yuan , Liu Qi Liang , Cai Qing Chi
Published: January 2014

Based on twin failure mechanism of fracture and shear , the bilinear transitional strength decomposition formula reflecting the nonlinear strength of rock material is proposed,.The decomposed brittle shear formula is integrated and finally the unified strength theory formula characterized by nonlinearity of Hoek-Brown criterion is established. It makes the unified strength theory characterized by nonlinearity of empirical strength criterion, rock mass strength reduction, etc. Besides, it contributes to promote the accuracy and applicability of unified strength theory in rock strength and rock mass strength,especially for the hard rock failure analysis.
Analysis of Single Factor on the Low Temperature Compressive Characteristics of Sulphate Saline Soil
Authors: Guo Xin Hong , Wu Guang De , Guo Xin Huan
Published: January 2014

According to the experiments study of sulfuric acid saline soil, the formula of compression coefficient with the changes of moisture content, salt content, initial dry density and temperature is presented, and the law of single influencing factor on sulfuric acid saline soil compression are analyzed in the paper.
Elastic Critical Buckling Modes and Stress of Cold-Formed Thin-Walled Lipped Channel with Multiple Intermediate Stiffeners
Authors: Ma Guang Yue
Published: January 2014

Elastic buckling modes of cold-formed thin-walled steel member have three relevant types: local, distortional and global. The complicated and important thing is to differentiating buckling modes and resolving buckling stress for engineers. It will be given for Cold-formed thin-walled lipped channel member with multiple intermediate stiffeners. The theoretical analysis coincide exactly with the experimental results, it can be used as a reference for engineers.
New Method for Static Analysis of Frame Structures Considered Floor Deformation
Authors: Zhang Hua , Huang Li
Published: January 2014

The piecewise continuum technique was used for the frame structure and a series-parallel system was taken for the mathematical model for the structure in which the deformation of floor slab had to be considered, and its state space equations were derived. Then the numerical solution of deformations and internal forces were obtained by using of state method. It is shown that the method of this paper has the advantages of less computation work and high precision.
Analysis on Bearing Capacity of Axial Compression Short Column of Double Back-to-Back C Steel with Gusset Plates
Authors: Chen Ming , Deng Bo Fan
Published: January 2014

To study the ultimate bearing capacity of axial compression short column of double back-to-back C steel with gusset plates, the bearing capacity of seven short columns of this section type were analyzed by experiment and finite element analysis, the destroyed form of the composite columns were understood, the degree of influence of C steel type, plate thickness and plate spacing on mechanical performance of composite columns were got, some basis for the application of this type member in practical engineering were provided.
A New Common Method in Junction Plate Designing of Steel Structure
Authors: Zhou Lun Gang , Gao Yang Qiuye , Lou Jian Kang , Wei Qun
Published: January 2014

As the most important component in steel structure engineering, the working dimensions and machining accuracy of junction plates often have to vary to suit the requirements of different structures and complex stress state. This thesis has presented a common design method which, by confirming all details of the plate, parameterizes its machining features including property, application range, contour, plate thickness, welding seam, arrangements of connecting bores, bore diameters and position, and makes flexible combinations to adapt to different linking patterns as orthogonal, oblique, slope changes, etc. The junction plate designed in this way has become an information model that covers all steps in junction plate designing.
Study on New Reinforcing Method of Steel Beams with Large Web Opening
Authors: Liao Wen Yuan , Li Long Qi
Published: January 2014

Due to web opening, stiffness and strength of steel beam decrease significantly. The common reinforcing method is setting stiffeners around the opening section; the paper presents two methods: herringbone stiffener and circular-arc stiffener. The finite element model is established with both material and geometrical non-linearity. Accuracy of the models is assessed by applying it to experimental results tested earlier by other researchers. Compared with other common methods, these two new methods are effective. Some reasonable suggestions are proposed for engineering application.
Research of Mechanical Performance of Thin-Walled Steel Lightweight Concrete Composite Floor
Authors: Wang Xin Tang , Huang Zheng Jue , Shao Bing
Published: January 2014

For study of mechanical performance and bearing mechanism of the fabricated composite floor consisting of thin-walled steel beams and lightweight aggregate concrete panels, the static load experiment of a composite floor was finished and presented. The specimen is simply supported at the two shorter sides and the other two longer sides free. The equivalent uniform loads are applied to the floor through setting the load blocks on the supper surface of the floor. The vertical displacements and strains of the specimen were measured and analyzed. The experimental results show that the new composite floor has greater bearing capacity and better elasticity. It is concluded that although there is combined action between the main beam and the concrete panel, there is also evident slip between top flange of the main beam and the concrete panel.
Interfacial Slip Calculation of FRP Plate Strengthened RC Beams under Uniformly Distributed Loads
Authors: Yang Jia , Wang Lian Guang , Hou Wen Yu
Published: January 2014

The interfacial slip between fiber reinforced polymer (FRP) and concrete beam is one of the key factors to affect the behaviors of FRP plate strengthened RC beams. Under external loading, the relative slip occurring on the interface between FRP plate and concrete beam causes the redistribution of stress and then the bearing capacity of the member is reduced. According to elasticity theory, this study analyzes theoretical analysis of interfacial slip. The analytical model is established, and the differential equations of interfacial slip of FRP plate strengthened RC beams are established. Using the boundary conditions, the calculated formulas of interfacial slip are deduced under uniformly distributed loads.
Validating a Computational Model of a Rooflight Steel Structure by Means of a Load Test
Authors: Čajka Radim , Krejsa Martin
Published: January 2014

During erection of a rooflight steel structure excessive deformation started appearing in the steel structure designed for a rooflight. After repairing the load-carrying system it was necessary to check whether the structure was free of permanent deformations. The situation was consulted with the investor and it was proposed to carry out a load test which should prove that the real structure was in accordance with the computational model.
Analysis on Foundation Pit Excavation and Soil-Nail Wall Supporting Technology by FLAC
Authors: Li Yan , Lai Yan Ting , Li Shuai Shuai , Yao Yong Sheng
Published: January 2014

2D-FLAC was applied to analyze the excavation process and the state of reinforcement structure, the stress statethe displacements Contour Graphthe displacement vector mapthe final settlement and the stress condition of the reinforcement structure were concluded through numerical simulation in the different conditions which the foundation pit was supported and not supported. The calculating results showed that the design of pit supporting structure was reasonable.
Comparison on Calculation Method for Post-Buckling Strength of Thin-Webbed I-Shape Member
Authors: Yao Xing You , Guo Yan Li , Liu Kai
Published: January 2014

The thin-webbed I-shaped members are used as the basic members for beams and columns of steel buildings in order to increase utilization ratio of steel. The local buckling can occur for these members because of the large width-thickness ratio and these members have a substantial post-buckling strength which can be used. Different codes in China have different estimation method for substantial post-buckling strength of thin-webbed I-shaped members. So it is very necessary to establish the same calculation method to consider post-buckling strength for different china codes. In this paper the effective width estimation methods of technical specification for steel structure of light weight buildings with gabled frames (CECS 102-2002), code for design of steel structures (GB50017-2003), technical code of cold-formed thin-wall steel structures (GB50018-2002), America specification (AISC: 2005), European specification (E3-1.5:2006), and Winter equation are introduced simply. The effective area of thin-webbed I-shaped members with different width-thickness ratio in web and slenderness ratio are estimated using these codes. Comparison of these estimated results show that CECS 102-2002, GB50017-2003, AISC: 2005, Winter equation, and E3-1.5:2006 may be conservative or unsafe for members with different slenderness ratio or width-thickness ratio of web. GB50018-2002 is applicable for members with different slenderness ratio or width-thickness ratio of web without considering interaction between flange and web of members and can be used to estimate the effective area of thin-webbed I-shaped members. At the same time, the calculated method of post-buckling strength of thin-webbed I-shaped members in CECS 102-2002 and GB50017-2003 could use the same method as GB50018-2002.
Reliability Analysis of Portal Frame Based on Space Overall Ultimate Bearing Capacity
Authors: Liu Feng , Cong Shun
Published: January 2014

This article analyses the reliability of portal frame based on space overall ultimate bearing capacity. A double nonlinear numerical model is established according to the finite element software ANSYS to track the space overall ultimate bearing capacity of the structure and to make clear the failure modes of the structure. The article studies and discusses the reliability of the portal frame based on space overall ultimate bearing capacity, gets the range of the structural reliability index and the sensitive degree of each parameter on the reliability, and presents the measures to improve reliability.
Simulation of Circumferential Pull-off Failure of Composite Foam Sandwich Tube under Axial Load
Authors: Li Feng , Liu Hong Bing , Xu Kang , Luo Yan Mei
Published: January 2014

Horizontal fibers of the outer layers of composite foam sandwich tube affected the compressive capacity of the tube under axial load. In order to clarify the strain distributions when the horizontal fibers of the outer layers were pulled off, dynamics finite element software LS-DYNA was used to simulate the model. Variation of hoop strain and axial strain of elements were observed. The simulation showed that the hoop strain of the composite tube increased gradually from the bottom and became the maximum in the middle of the member, which caused the pull-off damage and agreed with the test results. Strain along the circumferential direction of same height on the tube was average, and the same to the axial strain.
Design of Frame Anchor Structure for Landslide in BaiYu County Ouqu River Basin
Authors: Wang Bin , Gao Yong Tao
Published: January 2014

Taking BaiYu county Ouqu river basin landslide control in Ganzi state of Sichuan province as an example, study the whole design process of lattice frame anchor structure. Firstly, according to the geological conditions and technical code for design, safety criterion for landslide control is confirmed. Secondly, by making use of the features of lattice frame anchor structure this can protect slope and retain stability of landslide together with its small space between beams and light anchor. Finally, the advice and request for construction is specific ally put forward.
Numerical Simulation on Interface Delamination of Composite Foam Sandwich Tube under Axial Load
Authors: Li Feng , Xu Kang , Wang Jian Ping
Published: January 2014

The compressive capacity of composite foam sandwich tube is influenced by the fabrication process. Foam sandwich composite tube is made with technology of filled foam precut and curing molding together with prepreg ply. In order to clarify the interface to the bearing capacity, dynamics finite element software LS-DYNA was used to simulate the model whose interface is polished and waxed or not. The delamination was observed by the deformation cloud picture and displacement difference curve. The simulation showed that the composite foam sandwich tube which interface was polished and waxed before it was formed has relatively higher carrying capacity than that none-polished and none-waxed.
Test Study on Bending Deformation Performance and its Size Effect Characteristics of RC Cantilever Beams
Authors: Zhou Hong Yu , Ma Hua , Zhao Chun Xiao , Chen Yi Bo
Published: January 2014

Studies on size effect around deformation performance of RC members are carried out relatively fewer at present. This article evaluated bending deformation capacity and size effect characteristics of RC cantilever beams by means of test method. And decomposed various deformation components with size effect factors considered, including bending, shear and bar-slip deformation and so on. The article focus on discussing bending deformation components at different loading stage and putting forward corresponding distribution functions. Calculation and experimental results show that bending deformation characteristics have significant differences on specimen dimensions, especially in nonlinear loading stage after longitudinal reinforcement yielding. Large size members have a significant concrete crushing process. ductility reserves show a growing trend with specimens size increasing. Bending deformation ability depends on average stiffness along overall beam before longitudinal reinforcement yielding. After plastic hinge forming, its bending performance will be decided by average stiffness within hinge region equivalent length.
Analysis on Axial Compression Bearing Capacity of Steel Reinforced Concrete Sandwich Node
Authors: Xiao Liang Li , Yu Xiao , Han Jian Wei
Published: January 2014

According to the limit values of axial compression ratio of steel reinforced concrete given by technical specification for steel reinforced concrete composite structure (JGJ138-2001), the axial force of steel reinforced concrete sandwich nodes calculated by MIDAS and the axial bearing capacity calculated by limit values of axial compression ratio are compared with an actual project. The results show that steel concrete columns with designed strength of C60, the strength more than of column concrete strength higher than C50 is the least requirement as to meet the axial compression ratio. The result provides a theoretical basis for the future of safety work and the sandwich joint construction.
Effect of Angle of V-Type Steel Belt on Performance of Spiral Wound Gasket
Authors: Wang Jia , He Qing Zhong , Pei Yan Yang , Shi Yan
Published: January 2014

The performance of spiral wound gasket with different angle of V-type steel belt is researched, which includes effect of angle of V-type steel belt and pressure on compression rate and rebound rate. The results indicate that, when the pressure is same, the compression rate of spiral wound gasket decreases and rebound rate of spiral wound gasket increases with the angle of V-type steel belt increasing. When the angle of V-type steel belt is different, the optimum preloading need adjust in order to spiral wound gasket work well. For spiral wound gasket DN80, the optimum pre-pressure should be controlled within 45~55 MPa when angle of V-type steel belt is 80-degree, and the optimum pre-pressure should increase with angle of V-type steel belt increasing.
The Capacity Calculation and Finite Element Analysis to PBL Shear Key
Authors: Yu Bao Chu , Zhang Yun Long
Published: January 2014

Recognizing that PBL shear key in all aspects of civil engineering play an increasingly important role, firstly, to do a simple analysis and discussion on the ultimate strength of PBL, followed by the use of MIDA FEA finite element model was established, then its static power loads such as displacement and stress are analyzed and compared. In the final PBL shear bond stress at critical locations and displacement in different conditions is calculated.
Study Status of Steel-Bamboo Composite Slabs
Authors: Tang Jing , Guo Jun , Hu Gui Fen , Wen Yu , Li Yu Shun
Published: January 2014

At present, the development and application of new building structures are paid widely attention. In order to promote light-weight building slabs, different sections of steel-bamboo composite slabs are presented in this paper. Sandwiching thin-walled C-shaped steel or profiled steel sheet between two bamboo woods and bonding them with adhesive, a variety of different forms of steel-bamboo composite slabs are designed. For the C-shaped steel composite slabs, the reinforcement of self-tapping screws can effectively constraint interface slip between steel and bamboo plywood. It can also overcome the shortcoming of buckling which easily happen on C-shaped steel, ultimately, making the slabs have high stiffness and bearing capacity. The composite slabs with profiled steel sheets as the core part are strengthened by self-tapping screws and edge panels. And the global stability, deflection capacity and ductility performance of composite floors are significantly improved. Experimental results show that the reasonably combined composite slabs which have good combined effects, large carrying capacity and stiffness, can be used as architectural floors.
Interfacial Shear Stress Calculation of Concrete Beams Strengthened with FRP Plate Based on Energy Theory
Authors: Yang Jia , Wang Lian Guang , Hou Wen Yu
Published: January 2014

The collaborative work between FRP plate and concrete is achieved through the binder, so the interface of them is the weak links. Under external loading, the relative slip occurred on the interface between FRP plate and concrete causes the redistribution of stress and then the bearing capacity of the member will be reduced. Especially the FRP plate is a kind of resin material and its physical and mechanical properties will change with temperature and time. Based on energy variation principle, the differential equations of interfacial shear stress meanwhile to considering temperature and creep effect of concrete beams strengthened with FRP plate are established, in which the strain-energy of concrete beam, FRP plate and glue layer are calculated. And the calculated formulas of interfacial shear stress for a single point load are given.
Welding Residual Stress Numerical Simulation of Guyed Mast Earplate Welded Joint
Authors: Wang Yi Fei , Qu Wei Lian , Wang Wen Li , Wang Liang , Ji Bai Feng
Published: January 2014

Fatigue damage of guyed mast earplate welded joint is one of the main failure forms of guyed mast under wind load, and the welding residual stress is a important influence on fatigue performance of the welded joints, therefore, accurate welding residual stresses assessment of earplate welded joint is of great significance to the research on fatigue performance of guyed mast earplate welded joint under wind load. In this paper, welding temperature field of earplate welded joint was simulated by using thermal finite element method and the gauss heat source was used as thermal input. Then, welding residual stress of earplate welded joint was simulated by using thermal elastic-plastic finite element method and the temperature field results were used as the load. The welding temperature field simulation results better reflect the locality of heating, mobility of heat source and instantaneity of heating and cooling process during the welding process. The welding residual stress simulation results show that the residual stress peak of earplate welded joint reaches the yield strength of material, and appears at the dangerous point of earplate welded joint under structural external load. This point under influence of the welding residual stress and structure load is likely to be fatigue crack initiation location.
Shape Determination of a New Double Inner and Outer Latticed Shell String Structure
Authors: Ma Guang Ying , Yao Yun Long , Dong Yu Meng
Published: January 2014

Double inner and outer latticed shell string structure is a new type of space structure. The new structural system is to reduce the space occupied by roof structure and could be laid by the rigid roofing material conveniently. Based on the local analysis method and the whole system balance, a numerical algorithm was introduced and some suggestions for improvement were put forward. An example was investigated and the results confirmed the feasibility of the proposed method.
Researches on Rational Reinforcement of Equi-Limb +-Shaped Reinforced Concrete Columns
Authors: Sun Chao , Zhao Shu Li , Zhang Zi Tai
Published: January 2014

A nonlinear analysis program for the capacity of +-shaped columns with numerical integral method is complied. Using the program, the Date of Mx-My curves under different axial compression ratios is obtained for four different reinforcement of equi-eimb +-shaped reinforced concrete columns. The maximum moments in various loading angles are analyzed, the cross-sections ability to bear load influenced by different reinforcement is discussed, The rational reinforcement of equi-limb +-shaped reinforced concrete columns is derived. The date shows that the theoretical values and experimental results meet closely. Finally, Some suggestions in practice design for equi-limb +-shaped columns are given.
Geometric Nonlinear Orthotropic Shallow Shells Investigation
Authors: Stupishin Leonid U. , Kolesnikov Aleksander G.
Published: January 2014

Orthotropic shallow shells based on rectangular plan variation form are considered. Middle surface of shells depends on the high of supporting arches, the boundary conditions, and the thickness. Form of shall variation on the critical force coefficient and stress of shell are investigate with the help of Bubnov-Galerkin method. The calculation method has done in the Maple program complex.
Optimized Design of Larsen Steel Sheet Pile Supporting Structure Based on Parameter Sensitivity
Authors: Xie Jin Rong , Li Ba Tong , Chen Pi Hui , Zhuang Yu Qiong
Published: January 2014

Based on the transformation project of rain and sewage diversion in a city, the optimized design of Larsen steel sheet pile supporting structure in pipe-pit excavation was made. Using three-dimensional finite element method to analyze the retaining characteristics of Larsen steel sheet pile, soil deformation of adjacent transverse brace in the middle position and surface subsidence were regarded as design control indicators; through numerical analysis of the geological conditions, load, pile length, horizontal interval of transverse brace and other factors on the sensitivity of the design control indicators, horizontal displacement of brace was regarded as a key factor in the optimal design, and accordingly, related optimized program was proposed. The implementation results show that the optimized scheme can improve the efficiency of construction, protect the safety of construction, and provide a reference for the design and construction of similar projects.
Stability Analysis of Gravity Dam on Soil Foundation
Authors: Zhang Li Hua , Zhang Li Xin , Cheng Su Zhen
Published: January 2014

For small and medium sized water conservancy project, gravity dam on soil foundation is a comparatively economic and reasonable dam structure. Based on project case, the author discusses in this paper the seepage-proofing and anti-sliding stability of the gravity dam on soil foundation, focusing on calculation of anti-sliding stability of deep stratum, selection of soil pressure and effective measures for improving the anti-sliding stability of the gravity dam on soil foundation.
Effect of the Thick-Walled Steel Tubular Joint Stiffness on the Overall Stability of a Single-Layer Latticed Shell
Authors: Chen Lan , Yin Bo
Published: January 2014

As a new type of joint, the thick-walled steel tubular joint is applied in the single-layer latticed shell to solve the connectivity problem of rectangular tube. In combination with the design of practical project, the effect of the new joint stiffness on the overall stability of a single-layer latticed shell and the value of joint stiffness are studied by ANSYS. Some parameters as the rectangular tube section, the thickness of thick-walled steel tube and connecting plate are taken into account in the process of geometric nonlinear analysis. The results show that joint stiffness has great influence on the overall stability of a single-layer latticed shell and the range of effect gradually increases with the growth of rectangular tube section.
The Calculation Analysis of Supporting Structure with No-Load CFG Composite Foundation
Authors: Li Lian Xiang , Hu Xue Bo , Dong Xi Xiang , Hu Guang Lei
Published: January 2014

This paper introduces the design selection and implementation program of the supporting structure of no-load side-direction excavated CFG composite foundation, in the case of the foundation pit excavation of stage bin of the Jinan Cultural Arts Center Grand Theater. The monitoring data shows that the lateral reinforcement effect of no-load CFG composite foundation can not be discounted. Based on composite foundation and rock mechanics, consider the no-load CFG composite foundation as the composite soil, build its mechanics index system and calculation method. Calculating and analyzing of the supporting structure that placing a row of anchor cable in cantilever double-row pile and double-row pile by means of applying composite soil parameters and using the pit design software and numerical simulation, and comparing the result with actual monitoring data. Therefore, we can further prove that lateral reinforcement effect on soils by considering CFG composite foundation.
Analysis of the Slope Stability in the Heavy Rainfall Condition
Authors: Bian Jing Sheng , Bian Chao Sheng , Zhu Zhi Ming
Published: January 2014

Rainfall is one of the most important factors of the slope stability. After the "5.12" earthquake, there are a large number of loose solid produced by earthquake on the mountain, which leads to the soils strength loss in the earthquake disaster zones. and induces landslides and collapses easily in the heavy rainfall condition. The soil parameters obtained from the tests, the scene investigation of the Erman mountain landslide of Han Yuan County, the new developed control of ArcGIS to obtain intuitive landslide warning graphs have been carried out. Results show that the picture of hazard grade is consistent with the actual situation of landslide on Erman mountain. It will provide a scientific way to analyze the influence of heavy rainfall on slope stability.
The Structural Factors Causing the Deviation of Measured Pivoting COF of Spherical Bearings from Assignment
Authors: Hu Yu Xin , Xia John , Hao Hong Xiao , Leng Xin Yun , Guo Hong Feng
Published: January 2014

This paper expounds on the deviation of measured coefficient of friction from the assignment when the friction pair of the spherical bearing changes from plane structure into spherical structure, and summarizes the common explanation of such phenomenon of the past. Through the analysis on the methods of the measurement test for the coefficient of spherical pivoting friction and an in-depth analysis on the relation between the motion state and relative motion of the internal parts of the spherical bearing generated by rotating it based on this method, a new calculation formula for the coefficient of pivoting friction of the spherical bearing is put forward, which is of great significance to in-depth understanding of the structural principles of spherical bearing, precise structural design and sound bearing applications.
Formula of Unbonded Tendon Stress Increment Based Performance
Authors: Han Jian Qiang , Yu Yuan Yuan , Fu Xiu Yan
Published: January 2014

Unbonded tendon stress calculation of unbonded precast concrete structure is defferent from prestressed concrete structure, as tendon strain caused by the external load is not in accordance with relevant sections of the concrete strain obtained. As the deformation of unbonded tendons are not subject to the deformation of plane-section assumption, therefore, arise due to external loads of unbonded tendon stress calculation is more complex. In this paper, based on theoretical analysis and derivation, the pre-stress deformation of the unbonded steel stress formula was given, this can provide more scientific basis for the stress Analysis of unbonded precast frame structure.
Design and Numerical Simulation of the Disk Spring Vertical Isolation Device
Authors: Yan Xue Yuan , Wang Jian Ping
Published: January 2014

A vertical isolation device was designed and based on test requirements in this paper, which adopt disk spring with external guide sleeve. Through reasonable designing, this device can meet the requirements of stiffness and bearing capacity, etc. Single disk spring and properties of vertical isolation device were analyzed by finite element software ANSYS. The numerical simulation and the theoretical solution of single disk spring are basically coincident when small deformation. Even the deformation is large and there only are minor differences. The contact problems between disk springs, disk group and external sleeve, should be taken into consideration. The comparisons for hysteretic curve between numerical simulation and experiment result of vertical isolation device shows that their stiffness and energy dissipation capacity are very close, and the precision of the model can satisfy the requirement of numerical analysis and engineering application.
Application of Grey System Theory in the Dynamic Monitoring of Bridge
Authors: Yu Cheng Xin , Yu Zheng Wen , Zhao Yong Qian , Zhang Jia Dong
Published: January 2014

It has great significance to ensure the safety of bridge structure by using information technology to monitor the bridge dynamic deformation and find out problems in time, besides, it is more effective to make analysis of the bridge by using grey theory model. The combination of the two methods could avoid the observation error, and play an active role in improving the safety and reliability of bridge.
Study of Seepage and Stability of Foundation Pit under Continuous Rainy Conditions
Authors: Liu Zeng Rong , Qiu Hai Bing , Peng Ming Qing
Published: January 2014

Based on unsaturated soil seepage and shear strength theory , to explore the pore pressure dissipation law , it has been analyzed seepage about slope of deep foundation pit in Xian , supporting by pile-anchor retaining structure under the condition of continuous rainy by MIDAS software . The simulation result shows a temporary saturated region would appear on the surface of slope in continuous rainy days , then soil water content increasing as the rainwater infiltrate into a deeper soil layer gradually .For the sake of different cohesion of different time , Combine moisture filed , coming from pore pressure field , with the functional relationship between water content and cohesion , of simulated with filed test dates .The influence law of continuous rainy is derived from stability analysis by strength reduction fem about slope safety factor and stress of retaining structure .
Non-Destructive Evaluation of Reinforcing Rebar Radius by Digital Image GPR Technique
Authors: Chang Che Way , Lin Chen Hua , Lee Shyi Lin , Chen Ping Huang , Jen Ching Cheng , Chen Huei Lin
Published: January 2014

Ground Penetrating Radar (GPR) is a high efficiency technology to detect the cylindrical medium in the concretes material. The electromagnetic wave is incidental to double-rebar, and measures the reflection signal behaviors from energy zone. The results from the reflection signal of electromagnetic wave of the reinforcement concretes allow evaluating the radius of double-bar (1.6cm, 1cm). A physical model can effectively measure the radius of double-bar by the result of electromagnetic wave reflex behavior analysis. The results indicate that, this techology is capable of estimating the reinforcing double-bar radius to within 6%.
Structural Damage Detection Using Static Test Data
Authors: Li Cui Hong , Yang Qiu Wei
Published: January 2014

This paper presents a static-based method for damage identification in the simply supported beam structure using the incomplete measured static displacement parameters. The presented method makes use of the singular value decomposition of structural static displacement change, which is obtained by the static test of structure. It has been shown that structural damage can be detected by the number of the non-zero singular values of the static displacement change. The significant advantage of the proposed method is that it is economical in computation and is simple to implement. A simply supported beam structure is analyzed as a numerical example to verify the present method. Results show that the proposed method performs well even if the measurement errors inevitably make the damage assessment more difficult. It has been shown that the presented static-based methodology may be a promising tool to be used by research groups working on experimental damage detection.
Damage Localization of Structures Identified with a Deterministic-Stochastic Model
Authors: Wang Yen Po , Chang Ming Lian , Chang Jia Ge
Published: January 2014

In this study, a scheme integrated with deterministic stochastic subspace system identification and the method of damage localization vector (DLV) is proposed for damage detection of structures based on seismic response data. A series of shaking table tests has been conducted in National Center for Research on Earthquake Engineering (NCREE), Taiwan. Damage condition is simulated by reducing the cross-sectional area of some of the columns at the bottom ends. Both single and multiple damage conditions at various locations have been considered. Full or partial observation conditions have been taken into account in the system identification analysis. It has been shown that local damages (stories) can be identified from global responses of the structure to earthquakes if sufficiently observed.
Experimental Evaluation of Vibration Effects Induced by Planed Railway Line on Surrounding Historic Tower
Authors: Tian Yuan , Zhang Nan , Yang Wei Guo , Niu Jia Ming
Published: January 2014

Using field experiments, the vibration effects of historic tower induced by planed railway line are estimated. The vibrations include the construction vibration and the traffic-induced vibration. The results show that the blasting construction leads to the significant increase in vertical velocity and acceleration. There is no difference between the background vibration of field and foundation of tower. Different types of the sites soil around the tower cause little change. Each measurement time showed an upward trend of vibration level with the increase of frequency. The closer the tower is to the vibration source, the larger the structural vibrations would be. The dominant frequency range for highway-induced vibration is 10-20Hz. For train-induced vibration, the dominant frequency range is more than 40Hz. Surface waves will result in amplification phenomenon of vibration velocity of ancient structures within a certain range.
Research on Evaluation Method of Ultrasonic Testing for Inspection of Concrete Jointing Surface Quality
Authors: Liu Lin , Wang Qiang , Guo Kai
Published: January 2014

The combining Part Of new-old concrete is a weak link. The cohesive strength of the combining layer is generally lower than the strength of the concrete poured completely. It will greatly affect the reliability of structure, when the combining layer is bad. It is a effective method to Inspect combining surface conditions by ultrasonic method. But related specification for defect judgment method of ultrasonic method, which is not fit to detect the defect area is larger in detect area, the overall quality of members is poor, make the discreteness of data less, those causes low judgment value, and the defects to leakage. In addition, the less data is not easy to found out the outliers. We adopted ultrasonic angle measurement method for concrete jointing surface of 50 pillars testing analysis, Method to determine the critical value of defect of abnormal value, and studied critical value determination method of defects outliers, propose a method of defects determination base on the common probability method. As detection is shown, first, with this method detect the joint surface of the concrete columns, contrasted core drilling results, prove the method is effective and feasible. Second, For new pouring concrete quality is poorer near surface, defect points too much, contrasted core drilling results, prove the method is effective and feasible. In addition, using this method for detecting data less, contrasted core drilling results, prove the method is effective and feasible.
The Review on the Modified Exponential Model in the Fitting of Loading-Settlement Curves of Single Pile
Authors: Shuan Yu Chuan , Ding Bo Yang , Ouyang Ming
Published: January 2014

According to optimized fitting analysis for measured data in static load test of 22 different types of single piles, a new modified exponential model was proposed by authors in this paper. In comparison between the hyperbolic model and the integrated exponential curve model, the correlativity coefficients R of the modified exponential model were over 0.996. The fitting effect of the model of proposed in this paper is better than that of other models above-mentioned. The deviations between fitting and measured data in static load test for single pile was small, especially, in the tail pasts of fitting curves, the mean deviations of 2 test pile given in the paper are 1.61% and 1.99% respectively. The modified exponential model can be better described Q-S curves of single piles. It can be used to better evaluate the ultimate bearing capacity of single piles.
The Study to the Corrosion of Reinforcing Steel in Concrete by Using Galvanostatic Pulse Technique
Authors: Dou Yan Tao , Hao Bao Hong , Meng Bo , Xie Jun , Dong Ming Liang , Zhang Ao Lin
Published: January 2014

This paper presents the result from a study of Galvanostatic Pulse Technique for determining the corrosion rate of steel in reinforced concrete. The investigation to the condition factors and instrument parameter that significantly influence the testing result of the current pulse technique in on-site measurements is made in this paper. Firstly standard specimens which have different thickness of concrete cover and NaCl adding content were prepared, and instruments (CorroMap TM) for field measurement of corrosion rate of steel in reinforced concrete are selected for testing. From the study we can conclude that Icorr increased with the decreasing of the thickness of the concrete cover and the adding content of NaCl to the concrete when casting with non-linear rule, and an anodic pulse of 50 μA with pulse duration of 10 seconds is appropriate for testing both passive and active area of rebar.
Preliminary Study on Standardization of the Concrete Thermal Stress Test
Authors: Wang Ying Fei , Song Xue Feng , Li Chao , Xu Zhao Quan
Published: January 2014

This paper studied the influences in different test conditions of the concrete thermal stress tests, including different environment temperature, casting temperature, temperature histories and different rates of temperature fall, followed by some proposals regarding the standardizing research of thermal stress test of concrete.
Experimental Study of Composed Wall with Site Laying Reinforcing Rib under the Effect of Vertical Load
Authors: Sun Wei Dong , Niu Xin Yu
Published: January 2014

Composed wall with site laying reinforcing rib is composed of reinforced concrete rib, girtstrip and filling brickwork. This kind of wall is energy-saving, environmental-friendly and of good earthquake resistant performance. It is suitable to village building structure. In this paper, the load carrying capability and failure mode of this kind of composed wall under the effect of vertical load, the maximum bearing capacity of the wall and its influencing factors are mainly introduced.
Research Summary of Strengthening RC Shear Walls
Authors: Jiang Long Min , Li Hong Jun , Liu Lei , Zhang Jin Dan
Published: January 2014

This paper described the characteristics of the existing methods of strengthening RC shear walls at home and abroad, and discussed the research and operation of strengthening RC shear walls using these methods. It focused on the performance characteristics of the reinforced shear walls structure such as the bearing capacity, the ductility, the deformation capacity and energy dissipation capacity. And the future research trend of the High Performance Ferrocement Laminate reinforcement method is presented.
Experimental Study on Shear Lag of Box Girder with Variable Depth under Varying Lateral Position Concentric Loads
Authors: Shu Xiao Juan , Zhong Xin Gu , Li Zhen Xing , Shen Ming Yan , Chen Hong Bing
Published: January 2014

This paper introduces the test and analysis of shear lag effect of a vast scale model of a continuous box girder with variable depth under symmetric lateral varying concentric loads. The strain distribution of the top plates and bottom ones of three cross-sections is tested, while the concentric loads respectively forced on the middle section and the quartile ones. Those sections are: the root-section of the cantilever, mid-section and one quartile section. Test shear lag coefficients of feature points were got through dividing the test strains to those calculated by elementary beam theory. They are compared with those soluted by method of energy variational calculus. The comparing result shows that the shear lag coefficients of the top plate shift from positive to negative accompanying with the load position from ribs to mid point of top plate. At the same time, the overall shear lag coefficient level increases. Meanwhile that of the corresponding bottom plate distribution character finely changes, but its overall shear lag coefficient declines that means that the contribution to bending resisting of bottom weakens. Lateral position of concentric loads has fine influence on shear lag of those sections relatively far from the loads.
Research on Stability Strengthening Scheme of Continuous Welded Rail on Bridge in the Small Radius Curve Section
Authors: Wang Biao , Xu Jin Hui , Wang Li , Wang Ping
Published: January 2014

To solve the stability problem of continuous welded rail (short for CWR) on bridge in the small radius curve section, a sleeper connector structure was proposed, which is used to connect sleepers together and strengthen the stability of CWR. A FEM model was established to study the effect of the CWR stability strengthening scheme. This study result shows that the integrity of the track structure and the stability of CWR in the small radius curve section of which the radius is from 250m to 600m will be both improved by the strengthening scheme, and the larger the curve radius is, the better the CWR stability improvement will be. In order to guarantee the strength of sleeper connector and connecting bolt, it is suggested that the sleeper connectors at beam gaps should not be connected, and small resistance fasteners should be used in strengthening area.
A Hybrid Algorithm for the Multi-Objective Time Dependent Vehicle Routing Problem
Authors: Sun Yi , Chen Yue , Pan Chang Chun , Yang Gen Ke
Published: January 2014

This paper presents a real road network case based on the time dependent vehicle routing problem with time windows (TDVRPTW), which involves optimally routing a fleet of vehicles with fixed capacity when traffic conditions are time dependent and services at customers are only available in their own time tables. A hybrid algorithm based on the Genetic Algorithm (GA) and the Multi Ant Colony System (MACS) is introduced in order to find optimal solutions that minimize two hierarchical objectives: the number of tours and the total travel cost. The test results show that the integrated algorithm outperforms both of its traditional ones in terms of the convergence speed towards optimal solutions.
Optimization Model of Airplane Data Communication Network for Air Traffic Management
Authors: Zhu Xiao Hui , Tang Zhi Kun
Published: January 2014

Aiming to better network facility deployment and reduce cost, this paper proposed an optimization model for air traffic management airplane data communication network based on multi-objective nonlinear programming to optimize the communication network trunk node and analyze user subnetwork access. Using multi-objective decomposition method, a computer-aided resolution model is presented and then simulations proved its effectiveness. This model has theoretical instruction on air traffic management plane data communication network design, and can offer reference for relate studies.
Study of Characteristics of Phone Distraction on Drivers and its Influence on Traffic Safety Operation
Authors: Ma Yan Li , Leng Xue , Qi Lin
Published: January 2014

In order to study on the characteristics of phone distraction of drivers and its effect on traffic safety and traffic flow. Driver Behavior Questionnaire and Driver Skill Inventory surveys of 139 drivers were conducted combined with the basic situation of China, the SPSS software was used to analyze the processing of the survey results. The study found that the phone distraction will reduce drivers recognition ability of emergency event and driving performance, prolonging the reaction time of driver, it also has certain influence on lane changing behavior and safety following distance. In view of the problems existing in the research, four advices of driving training, publicity of legislation, punishment and technology were put forward.
The Model and Algorithm of Using Shunting Locomotive for Marshalling Stations
Authors: Cui Chong , Zhang Xing Chen , Chen Jun Hua
Published: January 2014

The scheduling problem of shunting locomotive in marshalling station can be described as a single machine scheduling problem with distinct due window, the paper established the model of using shunting locomotive by taking the minimized the total number of tardy trains as targets. The paper proposed an adjustment method for train break-up and make-up sequence as a model algorithm, the model algorithm can be used to get the optimal train break-up sequence and make-up sequence. Based on the actual data of Fuyang North station, the paper used matlab program to realize the model algorithm, and got the optimal train break-up sequence and make-up sequence of Fuyang North station. The algorithm was proved feasible and effective.
The Microscopic Simulation Based on Conflict of Pedestrian Crossing Street
Authors: Pu Qi , Sun Luan Ying , Gu Cheng
Published: January 2014

Data was gathered in order to obtain the conflict index at signal intersection when pedestrians crossed the street, and SOMK algorithm was applied to the four indexes of clustering, then index can be applied to evaluate the risk degree of signal intersection after index selection. A signal intersection was selected which was a main-secondary road intersection to simulate with VISSIM. On the basis of quantitating the pedestrian-vehicle conflict at signal intersection, calculated weighted average of the every conflict risk degree in the peak hours at the intersection, then resulted in intersection safety score of pedestrians crossing in peak hours, and evaluated safety grade according to the score. Compared and analyzed the results of actual investigation and simulation, which ensure the simulation model is effective. Afterwards the simulation can be taken into practical application based on its effectiveness.