bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Peak-Hour Carrying Capacity of Passenger Stations of Passenger Dedicated Lines
Authors: Zhong Jun , Wang Zhengbin
Published: September 2011

The existing researches on carrying capacity of passenger stations of passenger dedicated lines basically follow the calculation method for carrying capacity of passenger stations of existing lines. Since passenger stations of passenger dedicated lines are greatly different from passenger stations of existing lines on traffic organization mode, technical operation process and other aspects, researches on these stations should not purely follow the computing method for carrying capacity of passenger stations of existing lines. The research in the paper is suitable for the model of computing the carrying capacity of passenger stations of passenger dedicated lines, and establishing a model for the integrative computing of the peak-hour carrying capacity of the station is the emphasis of the research in the paper.
Research of Slope Back Analysis Based on Inclination Monitoring Data
Authors: Chao Wan Li , Wang Xing Hua
Published: September 2011

Problem is brought forward by the weak soil layer and the soil near slide surface. The weight back analyzed is presented to solve the problem. For obtaining the weight coefficient, the division of the inclination curve is done. After that, the soil can be divided into several blocks. The displacement of the curve is described by two values: the sliding and the deformation displacement. The method of the weight coefficient calculation is proposed applying the deformation displacement. At last, the sensitivity of the new methods is calculated.
Numerical Simulation of the Crack Propagation Processes in Rocks with Double Joints
Authors: Fu Jin Wei , Zhu Wei Shen , Wang Li Ge , Wang Xiang Gang
Published: September 2011

Engineering rock mass is commonly a brittle medium containing lots of joints or fissures. Under the stress redistribution in construction，the crack initiation，propagation，and coalescence may cause the strength and stiffness degradation of such medium. And these have an important impact on the stability of rock mass. By employing the analysis software of FLAC3D and improving the constitutive relation, the failure process of the double-cracked rock specimen under uniaxial and two-dimensional compression are simulated and studied. The numerical results match well with the testing results obtained by former scholars. The strength envelope of the jointed rock is obtained as well, and it is applied to analyzing the stability of a slope project.
Anchorage Effect on Fractured Rock and Cavern Stability
Authors: Wang Wen , Zhu Wei Shen , Yong Min
Published: September 2011

The effect of anchor on fractured rock specimens in splitting test is simulated by DDARF method in this research. The results are compared and agree well with laboratory test results. The DDARF program is also adopted to analyze the stability of an underground cavern with four groups of randomly generated joints in the surrounding rocks, in which two conditions with and without rock bolts are considered. Besides, the crack propagation process around the cavern and the displacements of key points in the surrounding rock are monitored and applied to investigate the stability of the cavern.
Creep Test of Hard Rock and Modified Generalized Kelvin Creep Model
Authors: Wan Lin Hui , Cao Ping , Huang Yong Heng , Wang Yi Xian , Zhang Xiang Yang
Published: September 2011

By a circular increment step load and unload method, a set of rheological experiments were performed to study the creep properties of amphibolite and the deformation data of instantaneous elasticity, instantaneous plasticity, viscoplasticity and viscoelasticity could be obtained. The results showed that: the creep threshold of amphibolite(σs1) was 25.46MPa; whenσs1s2, the proportion of plastic deformation in the total deformation was very small and the value of creep deformation always tended to a stable value; whenσ>σs2, the rock samples failed rapidly and had no obvious creep. According to the creep and failure properties of amphibolite, the generalized Kelvin creep model was acted in series with the Mohr-Coulomb criterion and a modified generalized Kelvin creep model was built and the corresponding visco-elasto-plastic constitutive relationships were deduced. The modified model could simulate visco-elasto-plastic deviatoric behavior and elasto-plastic volumetric behavior. The model parameters of amphibolite were fitted according to the data of rheological test. The testing curves were coincident well with the theoretic curves by comparison which showed the creep properties and the plastic flow of hard rock could be well simulated by the generalized Kelvin creep model.
Study on Different Methods of Computing Consolidation Coefficient by Excess Pore Pressure Dissipation Datum on CPTU
Authors: Tang Yan Chun , Meng Gao Tou , Mao Qiu Feng
Published: September 2011

Based on the different methods of computing the soil consolidation coefficient by excess pore pressure dissipation datum on CPTU, through computing the soil consolidation coefficient by different methods on the datum of CPTU model test and CPTU application research on Pearl River Delta, the applicability on different methods of computing consolidation coefficient by CPTU has been studied. The results show that on the computing value of consolidation coefficient, TB10041-2003 is more conservative; because of poor applicability on Strain Path Method and difficulty for obtaining t100 on Zhu-Xiaolin Method and α on Empirical Coefficient Method, some results can not be solved, so Strain Path Method and Zhu-Xiaolin Method and Empirical Coefficient Method are poor in engineering application; the computing way and the computing result on Zhang-Chenghou Method are similar with Torstensson Method with 50% consolidation degree. The achieved result can provide a foundation for further study for CPTU application research.
Design and Application of Spiral Protruding Multi-Disk Piles
Authors: Wang Ming Dong , Lin Jin , Yan Bin
Published: September 2011

To increase the bearing capacity of piles, the protruding technique proves to be both reliable and effective. The spiral protruding pile is a variation of this kind that can be applied to dry soil conditions. A practical formula is proposed for designing spiral protruding multi-disk cast-in-place piles. Also illustrated here is the project in which spiral protruding piles were applied with great success in terms of techniques and costs, while its unique advantages under certain conditions can be viewed. The paper aims to provide solid basis for research, design and further application of this type of pile.
Influences of Horizontal Initial Stress and Slope Angle on Stress Distribution in Mountains and Cavern Stability
Authors: Wang Li Ge , Zhu Wei Shen , Zhou Kui , Xin Xiao Li
Published: September 2011

Inbetween the many factors, which will influence the distribution character of initial stress in a mountain, different angle of mountain slopes and horizontal geostress will have important effects on it. Therefore, stress distribution in mountains under different slope angles with considering different lateral coefficients of initial stress is studied using numerical method in here. In this paper, the initial geostress distribution of mountain at typical vertical profiles are studied in the gravity field, with the slope angles being 30°, 45° and 60°, respectively. After the calculation, it can be known that the actual initial vertical stresses may be 2-5 times of the gravitational stresses calculated by direct depth gh for some zones. Meanwhile, it reveals that different horizontal geostress has a momentous impact on it as well. Computation of damage-fracture model for jointed rock is adopted to analyze the rock stability of a cavern. Comparison of the rock stability excavated in a mountain area or under a flat surface is made also.
Study of Stability Analysis and Reinforcing Technique on Counterrendency Fracture Rock Slope
Authors: Fu Hou Li , Qin Chun Hui , Han Jie
Published: September 2011

According to the essential features of countertendency fracture rock slopes and the geology condition of engineering. The stability of slope is calculated and evaluated by the following methods, including the stability analysis of slope with multiple-steps and Goodman-Bray's stability analysis of toppling slope. Moreover, we can put forward retaining structure which is based on grid beam, this is rely on results that have calculated according to the above theory, such as the characteristics of slope, parameter of rock and supporting density, and simulation the retaining structure in the method of numerical simulation.
Research on Mechanical Property and Economic Effect of Contractible Concrete Filled Steel Tube Support
Authors: Li Hui , Jiang Bei , Yang Bin , Wang Qi , Wang Hong Tao , Li Zhi , Li Wei Teng
Published: September 2011

The finite models of U-steel support, grid steel frame, hollow steel tube support and concrete filled steel tube support were established, of which mechanical property and influencing factor such as bearing capacity, support effect etc. was analyzed. Comparative analysis of economic benefit was carried out through research of material dosage and support effect index. The contractible joint for concrete filled steel tube was designed, and their mechanical characteristic was analyzed through test. The results show that the supporting performance of concrete filled steel tube support is related to confinement coefficient. Compared with traditional support, the concrete filled steel tube support has high bearing capacity, intensive later strength, good ductility, various standards and well economic benefits, and in conjunction with contractible joint, it is able to implement functions of quantitatively increasing resistance and yielding. Properly designed through optimization analysis on associated effects, the concrete filled steel tube support can meet supporting demand of deep soft rock and joint broken rock.
Seepage Analysis for Qianjiangping Landslide Applied Three Gorges Reservoir Water Level and Heavy Rainfall
Authors: Feng Qiang , Xiao Shi Rong
Published: September 2011

Saturated and unsaturated seepage analysises are given for the neonatal landslide——Qianjiangping Landslide applied Three Gorges Reservoir water level and rainfall which happened after the first sluice in Three Gorges Reservoir, the conclusions are discussed from the two aspects: Three Gorges Reservoir sluice and heavy rainfall.
Dynamic Response of an Elastic Foundation on Transversely Isotropic Saturated Soil to Harmonic Torsional Loading
Authors: Wu Da Zhi , Zhang Zhen Ying , Liu Kai Fu
Published: September 2011

An analytical method is presented to investigate the torsional dynamic response of an elastic foundation resting on transversely isotropic saturated soil subjected to harmonic loading. The dual integral equations of an elastic foundation are established according to the mixed boundary-value conditions at the interface and the dynamic torsional characterizes, which are further converted into a Fredholm integral equation of the second kind. The torsional dynamic response problem is solved by solving the Fredholm integral equation. By comparing present numerical solution with that of other’s, the correctness of this paper has been verified.
Analysis of Urban Rail Transit Based on Complex Network
Authors: Du Yan Ping , Chen Fang Fang , Zhang Zhen Hua
Published: September 2011

The development of urban rail transit plays the more and more important role in the public transit. It’s significant to analyze the urban rail transit network characteristics and its stability. The basic statistics parameters of Beijing metro network are computed in the paper based on the theory of complex networks, and its network characteristic is analyzed through the comparison to characteristic parameters of four typical networks.
Application and Mechanism to Support Tunnel Adjoining with Soft Rock Masses by Yielding Inverted Arch of Composite Structures
Authors: Liu Chuan Xiao , Wang Long , Liu Zhi Hao , Zhang Xiu Li
Published: September 2011

A yielding inverted arch of composite structures is designed to control serious floor heave of tunnel. Constitution of the inverted arch is studied to present mechanism of the composite structure to restrain floor heave. By field trial of the yielding inverted arch with composite structures, it is an effective method to control floor heave, and its important function is to absorb main elastic deformation coming from bottom strata.
Large Eddy Simulations of Flow past a Circular Cylinder with/without an Upper Rivulet
Authors: Du Xiao Qing , Zhao Yan
Published: September 2011

Large eddy simulation (LES) is utilized to simulate flow around a circular cylinder with/without an upper rivulet at Reynolds number 70000. Mean and fluctuating wind pressure coefficients on the artificial upper rivulet and the circular cylinder are obtained. The flow field and the vorticity magnitude in the wake flow zone of the cable model with rivulet at different positions were also investigated. It is found that a small vortex occur near the back of rivulet, when it locates in some particular positions, that might be the reason aerodynamic forces changing dramatically. These results lay foundation for the research on regulation about the influence of rivulet size and shape on cable aerodynamic in future.
Research into the Parameter Influence on Coupled Vibration Analysis of High Speed Train and Bridge
Authors: Tan Chang Jian , Ji Wen Hong
Published: September 2011

To investigate the characteristic of coupled vibration of high speed train and bridge, the effect of the railway track irregularity, different train speeds were investigated based on analyzing the coupled vibration of the JR300 high speed train-bridge system The results show that the vertical acceleration of train will be influenced much when the railway track irregularity is considered. The study suggests that the dynamic response of the train and bridge decreases with an increase in the train speed, when the train speed is at a certain zone, and the dynamic response increase rapidly with the increased train speed when the train speed is out of this zone.
Numerical Simulation for the Excavation in Tunnel Construction
Authors: Li Yong Suo , Zhang Ke Neng , Yang Xian , Huang Chang Bo
Published: September 2011

Tunnel excavation is often done in underground engineering such as civil tunnel construction and mine excavation. The numerical simulation can output colorful results to interpret the tunnel excavation effect more easier. Among all the numerical simulation methods, fast lagrangian explicit finite difference code of continua (FLAC3D) is widely used to solve practical problems, especially in field of elasto-plastic characteristic and construction procedure. So in the present paper, 3 steps of excavations in a tunnel is modeled by FLAC3D to present the stress and displacement distribution, and give guidance for the real practice.
Research on Design Vehicle Load for Long-Span Bridges
Authors: Hu Da Lin , Ding Ding , Chen Long Gang , Xia Chun Mei
Published: September 2011

This paper presents simulation analysis of load effects of bridges under random fleet. Based on actual data of vehicle loads on Guangzhou-Shenzhen Expressway and relevant statistical results, mid-span bending moments of long-span virtual simple-supported beams are calculated. Then probability distribution of the bending moments and extreme value distribution of the load effects within design reference period are obtained. Finally, characteristic values of mid-span bending moments and recommended values of design lane load are calculated, sequentially. The results studied in this paper can be as a reference for long-span bridge design, and also can be a reference for overloading control or weight charge policy.
Data Base for Punching Shear Strength of Reinforced Concrete Slabs and Evaluation for CCES Equation
Authors: Yang Qiu Ning , Mao Ming Jie , Hamada Sumio
Published: September 2011

Several equations for punching shear strength of the reinforced concrete slab have been proposed in the world. These equations have their own factors affecting the strength. There are numerous test data for punching shear strength of RC slabs, which have been obtained by numerous researchers. A database with approximately 300 specimens has been structured through the present study. In the present study seven equations for punching shear strength are evaluated based on the database. CCES equation is also evaluated from the present database.
Failure Mechanism of Reinforced Concrete Rib Arch Bridge under Near-Fault Earthquakes
Authors: Gao Wen Jun , Tang Guang Wu , Kong Yi Da
Published: September 2011

A typical reinforced concrete rib arch bridge was chosen to investigate its nonlinear response to near-fault ground motions recorded in 2008 Wenchuan earthquake. Results showed that significant seismic damage may occur, maximum demands were higher for near-fault records having forward directive than far-fault motions, and the rotational capacity of rib plastic hinge is not enough for the large compression force of arch rib. While backward-directivity motions, typically do not exhibit pulse-type motions, only have medium seismic damage to the arch bridge.
Experimental Study of Loess Structural Strength and Resistance Coefficient
Authors: Chen Xi , Luo Ya Sheng , Cheng Da Wei , Guo Hong
Published: September 2011

The paper proposes a calculation method of soil particles framework structural strength, and provides a new parameter, defined as resistance coefficient, which can quantitatively describe the relationship between active stress and passive stress on soil particles framework. The research of the impact of water content, binding materials content and dry density on structural strength and resistance coefficient is conducted under confined compression test with undisturbed and man-made cement structural loess from Yangling. The research shows that structural strength of loess particles framework increases with the increasing of deformation, and with the same deformation, the structural strength of loess particles framework increases with the increasing of water content ; loess particles framework is sensitive to the weakening role of water. The resistance coefficient is smaller and more instability with the increasing of deformation under high water content conditions. The binding material has significant effect on structural strength and resistance coefficient. Moderate cement mixed with loess particles framework cannot only improve the structural strength but also decrease the sensitivity of loess particles framework to the weakening role of water. By controlling the binding material content, water content and dry density, the structural strength and resistance coefficient of man-made cement structural loess will be the same as the undisturbed loess. Increasing dry density can make the structural strength of loess particles framework higher, but the value and the stability of resistance coefficient of loess particles framework structure with high dry density is lower than that in the initial dry density.
Modal Analysis of Simply Supported Plate Using Wireless Smart Sensor Networks
Authors: Lu Jing Zhou , Zhu Xu , Chen Lin , Jin Bo , Sim Sung Han , Spencer Billie F.
Published: September 2011

The unique features offered by wireless smart sensor networks (WSSN), including high integration, wireless communication, on-board computation, small in size, simple installation, and cost effectiveness, facilitate a new paradigm to structural health monitoring (SHM) for civil infrastructure. The paper is an example use of WSSN and the Illinois SHM Project toolsuite. An experimental study of modal analysis of a simply supported plate structure has been undertaken. The eigensystem realization algorithm (ERA) in conjunction with natural excitation technique (NExT) and stabilization diagram (SD) is used to extract the modal information, including natural frequency, damping ratio and mode shapes, from the ambient vibration test data. The results show that WSSN designed for SHM application utilizing a smart sensor platform suited to high-frequency, high-fidelity data acquisition and demanding data processing algorithms.
Wind Pressure Coefficients Determination for Pre-Homogenization Storage in Cement Mill
Authors: Luo Yue Ming , Yin Yue , Liu Xi Liang
Published: September 2011

Due to the increasing of wind disaster, structural wind engineering arouses more and more attention recently, with rapid development on spatial structure and continuous innovation of structural style. The main purpose of structural wind engineering is to calculate the wind pressure coefficients of structure. In this paper, the numerical wind tunnel method (NWTM), based on the Computational Fluid Dynamics (CFD), is applied to study wind load. The wind pressure coefficients of reticulated spherical shell with the 4.6m high wall were first determined, using the NWTM. The results are then compared with the wind tunnel test (WTT) and good agreement is found. The feasibility and reliability of NWTM were then verified. As the second example, NWTM is carried out to predict wind-induced pressure on reticulated spherical shell without wall. Further the distribution behavior of wind pressures on this kind of structures is discussed which could provide professionals the reference for the design of structure.
Study on Earthquake Damage Characteristic on Mountain Tunnel and Analysis
Authors: Hu Hui , Qiu Wen Ge
Published: September 2011

This paper collects earthquake damage data and research on tunnel in recent years(Wenchuan earthquake,Ms 8.0;Yushu earthquake, Ms 7.1, Chi-Chi Earthquake,Ms 7.6 and so on). Damage patterns and characteristics of mountain tunnels in severe earthquake region are classified: Slope failure near tunnel portal; Spalling and collapse of tunnel portal and end wall; Lining collapse; Longitudinal and transverse cracks of lining; Slant and transverse fracture of lining; Sheared off lining in fault region; Steel frame damage of primary support; pavement or bottom cracks. The damage mechanisms are analyzed and some proposals are put forward for tunnel rehabilitation and new tunnel construction: It is suggested that in strong earthquake areas, a comprehensive aseismic design should be conducted considering tunnel portal structure and slope. Line selection should avoid or reduce passing through active faults and avoid placing tunnels too close to slope faces when planning future tunnels. The paper provides a reference for seismic design and construction procedures of tunnel.
Vertical Vibration Analysis of Large Span Steel Pedestrian Bridge
Authors: Li Jian Qiang , Zhang Shu Yi
Published: September 2011

The problem that the large span steel pedestrian bridge has a too large vertical amplitude is very common in every major cities. This document analyzes the problem and finds out the cause of the problem , which is the first frequency of pedestrian bridge is very close to the people walking frequency , and leading to the occurrence of resonance. To avoid resonance, this document proposes the optimal design scheme
Structural Health Monitoring System for High-Rising Buildings and its Application for Shanghai Tower
Authors: Chen Lu
Published: September 2011

Structural health monitoring system for high-rising buildings is a new structural effort that tries to make proper maintaining strategy to extend structural life of the building by collecting structural performance data under normal loads as well as severe weather conditions. This paper introduces the monitoring items of Shanghai Tower.
The Design of Roof Structure for Bicycle Stadium in Jinan Olympic Sports Center
Authors: Lin Yan , Sun Chang Lin , Jiang Wei , Du Gang , Lin Qing Wei , Chi Yun
Published: September 2011

Bicycle Stadium in Jinan Olympic Sports Center adopts spatial truss structure with steel tube. The design and analysis of the roof structure are introduced in detail. By applying the program SAP2000 and STCAD, the static and dynamic properties of the roof structure are obtained. In addition, the design of the cast steel support joint are studied, which focuses on analyzing the static behavior of the typical cast steel support by using the program ANSYS. The results prove that the spatial truss structure is reasonable, which can satisfy the requirements of safety of the building. For the complex support joints subjected to large reaction forces, cast steel support joints can meet the architectural and structural requirements. The research results in this paper can provide references for the design of similar engineering.
The Bearing and Earthquake Resistance Analysis of Aeroconcrete Wall
Authors: Yin Xin Sheng , Ba Pan Feng , Cai Jing Wei , Xie Xin Ying
Published: September 2011

This article analyzes the aeroconcrete wall of vertical ultimate load capacity.We make discussions about different spacing of the concrete structure colum, the different floor height, the different wall’s thick.Then combining the result, we discuss the wall’s ductility under the horizontal cyclic loads, the hysteresis loop and so on. Finally,we study the hole wall earthquake resistance performance under the central load and the non-central load function.Comprehensive all results, the improving methods are presented for your consideration.
The Monitoring and Analysis of the Peripheral Environment Influence by TBM Constrction in Chongqing Rail Transit Line 6
Authors: Huang Ming Li , Xu Fei , Wu Zhi Yong
Published: September 2011

This paper relies on Chongqing City Transit Line 6 which is from Wulidian Station to Shanyanggou Reservoir Station nodal project, focusing on the monitoring and comparative analysis of ground sedimentation of the nearby housing estate, bridge abutment as well as the flat surface of the test section (mileage K17+300~K17+600), otherwise, monitoring and comparatively analyzing the deformation of the supporting structure inside the tunnel. This is the first application of TBM in the urban mass transit and the research achievement will accumulate valuable experience and data for the application of TBM in the urban mass transit.
Pseudo-Dynamic Experiment on Structure of Concrete Filled Steel Tube (CFST)
Authors: Chen Bo Wang , Oyang Yang , Tan Jian Guo
Published: September 2011

A pseudo-dynamic test has been finished to a CFST tube structure model. The model with 13 floors and a scale of 1:10 consists of an outer-tube and an inner-tube, the former is a framed-tube supported on CFST frames and the latter is an RC tube. A series of pseudo-dynamic tests on acceleration earthquake waves in four cases (peak acceleration equal to 0.22g, 0.4g, 0.62g and 1.0g) have been fulfilled by taking to the model. Some behavior of model is researched under earthquake, such as displacement time-history cure, force time-history cure and so on. The experiment has illustrated that the CFST tube structure is an outstanding structural style with excellent anti-seismic behavior.
Under the Corrosion in Sodium Fatigue Performance of Concrete
Authors: Zhou Jing Hai , Wang Wei Wei , Meng Xian Hong
Published: September 2011

Many Marine environment or other corrosion in the concrete structure under the condition of fatigue cycle usually bear, thus make these components of fatigue and corrosion under coupling effect, thus speeding up the process of structure component, killing structure degradation of corrosion fatigue. This paper using self-designed corrosion fatigue loading test device, studied in sodium solution of concrete under the action of erosion strength increasing regularity, results show that the concrete strength by corrosion fatigue than fatigue specimen attenuation extent.
A Novel Method of Extracting Damage-Sensitive Feature for Electromechanical Impedance-Based Structural Health Monitoring
Authors: Feng Xin , Zuo Chun Yuan , Zhou Jing
Published: September 2011

The electromechanical impedance (EMI) technique, which employs piezoelectric ceramic (PZT) patches as transducers, is emerging as an effective and powerful technique in structural health monitoring (SHM). This paper presents a novel method to extract the damage-sensitive feature (DSF) for EMI-based SHM. Firstly, the concept of effective drive point (EDP) impedance was introduced briefly. Secondly, a novel DSF was proposed as the ratio of the active parts of EDP admittances before and after damages. Finally, the effectiveness of the proposed DSF was experimentally verified. The results show that the novel method provides a sensitive feature for EMI-based SHM
Research on Static and Dynamic Tests of Steel Orthotropic Decks
Authors: Liu Xiao Guang , Zhao Xin Xin , Zhang Yu Ling
Published: September 2011

The static and crawl tests on the steel orthotropic deck of Xihoumen bridge were performed, which is to study the mechanical behavior and stress history curve of the construction details under traffic loading. The results of the tests reveal that, under the three-axle-weighted 30 t truck, the biggest value of longitudinal stress for the bottom of rib is 51.7MPa，the value of principal stress for the hole upper of diaphragm is 30.8MPa and transversal stress for the deck is 16.7MPa. the length of longitudinal influence line of transversal stress for the deck and vertical stress for the web of rib is about 7.2m. The influences of the principal stress for the opening upper of diaphragm and longitudinal stress for the bottom of rib are 5.4m and10.8m, respectively. Furthermore, the stress range and cycle times were analyzed by sluicing method. Under the condition of the craw tests, cycles of the key details that the stress range is larger than 5MPa for steel orthotropic deck are as follows: the longitudinal stress for the bottom of rib is three times and the biggest value of range is 60.1MPa: the transversal stress for the deck is three times and the biggest value of range is 26.8MPa: the vertical stress for the web of rib is four times and the biggest value of range is 16.1MPa: the principal stress for the hole upper of diaphragm is two times. Finally, Based on the results of dynamic test, and considering the specifications on impact coefficient by various countries, we suggest that impact coefficient shall be adopted in the calculation of fatigue of steel bridge deck; the joints on bridge deck 1+=1.75; for other parts, the calculation of each structure details of longitudinal ribs and deck, 1+=1.0; for calculating lateral girder (diaphragm) details, 1+=1.15.
Effect of Ceramsite Type on the Internal Relative Humidity of Ceramsite Concrete
Authors: Ji Tao , Chen Cai Yi , Chen Yong Bo , Zhuang Yi Zhou
Published: September 2011

The internal relative humidities of concrete using different types of ceramsites with different prewetting degrees were monitored by humidity sensors. The study reveals that the internal relative humidity of concrete using low water absorption rate ceramsites declines more slowly than that of concrete using high water absorption rate ceramsites when not prewetting; the internal relative humidity of concrete using high water absorption rate ceramsites is higher than that of concrete using low water absorption rate ceramsites when their prewetting degrees (1h or 24h) are the same; the internal relative humidity of concrete using ceramsites is higher than that of ordinary concrete, whether the ceramsites are prewetted or not.
Research on Residual Strength of Concrete under Fatigue Loading and Corrosion of Chloride
Authors: Zhou Jing Hai , Zhang Yu Xian , Meng Xian Hong , Liu Ying
Published: September 2011

In the actual project, many concrete structures not only suffer the loading of static force and the repeated loading but also affected by the corrosive effects of chemical substances in external environment, which makes concrete corrosion and damage become an unavoidable issue in engineering. The research on it at home and abroad is still in stage of theoretical exploration. This paper studied the attenuation of the residual strength of concrete under fatigue loading and corrosion of chloride, using self-designed experimental corrosion fatigue loading device. The results show that the corrosion of concrete by chlorine ion is unneglected, its influence is greater than mathematical superposition of alternating load and corrosion when they affect the concrete separately.
Experimental Study on Seismic Behavior of Masonry Walls Retrofitted Using Epoxy Resin Injection
Authors: Bu Chang Ming , Li Ying Min , Salih Oday Asal
Published: September 2011

2008 Wenchuan earthquake has showed that failure of masonry walls is one of the major causes of material damage and loss of human life due to seismic events. Therefore, study of masonry walls seismic behavior and development of effective and practical retrofitting schemes is an urgent need. So this work presents an experimental program that investigates in-plane seismic behavior of common types of shale masonry walls before and after retrofitting using epoxy resin injection technique. In this experimental study, the primary objective was to evaluate the efficiency of this retrofitting method on masonry walls. The results of this study shows that using epoxy resin injection technique increased the in-plane maximum strength, the ductility, the initial stiffness value, the stiffness, and the energy dissipated during all the loading stages, and decreased the ductility factor.
Experimental Research on Flexural Behavior of Load-Bearing Characteristics on Reinfoeced Concrete Beams Strengthened with near Surface Mounted Prestressed CFRP Tendons
Authors: Xu Ping , Zhang Min Xia , Ding Ya Hong , Wang Xing Guo
Published: September 2011

In order to improve flexural behavior of concrete beams, the 7mm-diameter carbon fiber reinforced plastic (CFRP) tendons applied different levels of prestress were put in to 20×20mm grooves opened in the concrete surface of the tensile region in the concrete beams.Grooves were filled with building structural adhesive, when it solidified bending test of strengthened beams would carry out. Flexural behavior of nine RC beams strengthened with prestressed near surface mounted CFRP tendons applied different levels of prestress and one unstrengthened RC beam were studied. In these tests, bending stiffness and load-bearing characteristics of test specimens were studied. Experimental results show that the high-strength performance of CFRP have been made full use; the stiffness of strengthened beams risen notably, the maximal crack load increased by 303.17%, the maximal ultimate load increased by 237.92%.
Seismic Response Analysis on Pile-Soil Couple System by Lumped Mass Method
Authors: Wang Li Qiang , Wang Yuan Zhan
Published: September 2011

Pile is widely used as deep foundation in civil engineering. The dynamic interaction between pile and soil is an important problem in the field of soil-structure interaction. This paper established a model to calculate the seismic response of pile-soil couple system. In this model, pile and soil are regarded as lumped mass, soil was divided into two parts: the far region soil and near pile region soil. These two parts are simulated by different mechanical characters. A differential equation of motion of pile-soil couple system was established in the paper, this differential equation can be solved by Wilson-θ method. An example was introduced to study the behavior of pile-soil couple system.
Review in the Reseach of Insulation Grid Wall
Authors: Zhou Ming Jie , Zhao Hong Xin
Published: September 2011

This article mainly introduces the structural characteristics of the multi-ribbed panel wall, the heat preservation grid wall and phosphogypsum grid wall, from their mechanical characteristics and seismic performance and so on.This paper summarizes the domestic and foreign research situation, analyzes on the problems existing in the wall structure, and clarifies the further research direction.
Experimental Study on the Damaged RC Frame Structure Strengthened by Composite Reinforcement of CFRP and Steel Plate under Low-Cycle Repeated Load
Authors: Zhao Shao Wei , Yuan Kun , Guo Rong
Published: September 2011

We take low frequency cyclic reverse tests to three RC frames made with the same dimension. One of frames is not reinforced for reference; the others are loaded to steel yield and then completely uninstalled. One of injury RC frames is strengthened by CFRP, and we use CFRP and steel plate mixed to strengthen the other one. Then experiment under low-cycle repeated load for strengthened frames have done again, and two seismic reinforcement methods are compared by the test performance of the framework. The results show that compared to CFRP, mixed reinforcement can improve the structural bearing capacity more effectively. The frame strengthened by CFRP reflects better energy dissipation and ductility than another.
Response of Conductor Pipe Induced by Motions of Jackup in Cantilever Mode
Authors: Teng Wang
Published: September 2011

With gap elements modeling the gap contact condition between jacket platforms guided supports and the conductor pipe, the deflections of the conductor pipe induced by the motions of Jackup in cantilever mode, and offsets of the jacket platforms under operating conditions are investigated. The limiting relative excursions between the jacket out of phase or in phase with the jackup and the distributions of the moment are quantified by the strength and stability analysis of the conductor systems. The results show to avoid an overload for given conductor strength and dimensions, the maximum relative displacement between jackup and jacket platform with guide offsets is about 75.0cm.
Study on a New Linear Arrangement of Prestressed Concrete Beam
Authors: Li Chun Bao , Wang Qing
Published: September 2011

A new kind of prestressed concrete beams with spiral broken line cables subjected to torsions is present based on the fundamental principle of equivalent loads of prestressed reinforcement. It carried out the emulation analyses and load tests of the beams on spiral broken line cables and the general prestressed concrete beams with longitudinal cables. The results showed that the spiral broken line cables effectively postpone the cracking of the beam and increased both crack torsional moment and ultimate torsion moment, and kept some ductility.
Seismic Reliability Analysis Based on Characteristics of Failure Function for RC Frame Columns with Large Eccentric Compression
Authors: Jiang You Bao , Zhao Yu Lai , Yang Wei Jun
Published: September 2011

Based on the analytical method, the failure function is obtained for reinforced concrete (RC) frame columns with large eccentric compression under vertical and horizontal loads together. A special characteristic is found that the whole correlative curve of vertical and horizontal loads may contain some rising parts under limit state, and the corresponding determinant condition is also proposed. With the approximate linearization of rising parts, the practical limit state function is also obtained. Then, the seismic reliability is calculated for RC frame columns with large eccentric compression under different combined ratios of gravity and horizontal earthquake loads according to the current Chinese design code. The results indicate that its reliability is lower than the reliability of RC frame beam when the strong column coefficient adopts low values. This provides some useful references for engineers to design RC columns with large eccentric compression reasonably.
Study on Damage Identification for Reinforced Concrete Structures Based on Wavelet Transform
Authors: Miao Xiao Yu , Wang She Liang , Fan Yu Jiang
Published: September 2011

Reinforced concrete structures are prone to damage during their service lifetime caused by factors such as the effect of overload, ground motions, and other actions. Undetected damage may lead to structural failures. Early detection of damage and timely repairs can prevent catastrophic failure and ensure regular service of structures. As a result, a so-called delimitation wavelet-transform search method, based on the characteristic of multi-resolution of wavelet transform, is presented in this paper for on-line damage identification of reinforced concrete structures. One possible advantage of this method is that the damage temporal and spatial location can be detected rapidly and efficiently. Further research is carried out with numerical simulation of a structure test model to study the storied damage detection and localization of reinforced concrete frame structures under seismic actions. The analyzing result is compared with that observed in a simulated earthquake vibration stand test. Good agreement is obtained and it verifies the effectiveness and validity of the method proposed in this paper.
Application of High Performance Concrete in Yu-Cheng Bridge
Authors: Dai Hong , Zhang Shi Lin , Fan Tao , Sun Hai Jun , Gu Zhong Hua
Published: September 2011

This paper focus on the application study of HPC, and both of HPC and normal concrete (NC) were adopted for comparison in the Yu-Cheng Bridge Durability tests were carried out on HPC and NC respectively, based on the comparative analysis of the results obtained from these tests, durability evaluation of HPC is made. The results are useful for the evaluation of durability of HPC.
Study on Constructional Reinforcement for the Foundation of Blast Furnace due to Temperature Effect
Authors: Li Ying Min , Wang Lu , Liu Li Ping
Published: September 2011

Based on the test and numerical analysis, the paper studied the constructional reinforcement of blast furnace foundation under the influence of concrete hydration and top temperature. The results indicate that constructional reinforcement should be thinner and have a small spacing. Stress concentration always appears around the corner and constraints of blast furnace foundation, where should be strengthened with constructional reinforcements. In order to prevent cracks caused by internal tensile stress during concrete hardening, it is necessary to place temperature reinforcement inside the foundation. Temperature effect should be considered at the circular area on top of blast furnace foundation and should be strengthened with constructional reinforcements.
Guided Waves Tomography and Image Fusion for Damage Identification in Pipes
Authors: Zhang Hai Yan , Yu Jian Bo , Chen Xian Hua
Published: September 2011

The detection of localized defects such as cracks and corrosion in pipes using guided waves has been shown to be an effective nondestructive evaluation technique for structural health monitoring (SHM). Cross borehole tomography in seismology is introduced into the guided wave inspection of a pipe when the pipe is considered as an unwrapped plate. Guided waves propagating in pipe with a crack defect are simulated using the finite element model and the arrival times for the fastest modes are extracted and sent to the tomographic algorithm. The tomographic reconstruction is based on the simultaneous iterative reconstruction technique (SIRT). For some cylindrical shell geometries such as stacked storage tanks, access to the entire circumference of the structure could be impractical or even impossible, three different image fusion techniques are used to enhance the image equality reconstructed from the incomplete datasets. The results show that the defect is more pronounced after imaging fusion.
The Experimental Study on Concrete-Filled Thin-Walled Square Steel Box Short Columns Fixed with Composite Steel Bar
Authors: Wang Hai Chao , Xu Xi Quan , Zhou Li Jun
Published: September 2011

The method of construction about the concrete-filled thin-walled square steel box short columns is studied in this paper. Composite steel is designed inside of the concrete-filled thin-walled square steel box short columns. The use of the transverse steel bars’ constraining effect on the concrete and bonding effect on the walls enhances the local stability and bearing capacity of the wall. According to the concrete strength C30/C35/C40 and the thickness of the steel 1.25mm/1.75mm/2.5mm,42 short column specimens are made and the size of all specimens is 200mm×200mm×690mm.The static bearing capacity test is done by the 500-ton electro-hydraulic serve testing machine. The whole curve is made .The composite steel and the thin-walled steel’s strain is tested. The results show that this method of construction has a certain effect on constrainting concrete and bonding effect on the walls, significantly improving their mechanical properties, increasing the carrying capacity and ductility, and it is easy to be accomplished.
Study on Setting the Initial Nodal Temperature on the Joint Face of Concrete Dam
Authors: Zhu You Ping , Chen Shou Kai
Published: September 2011

Because of lacking a rigid method of setting the initial nodal temperature on the joint face, the accuracy of temperature simulation would be affected in concrete dam. Based on finite element method (FEM) and principle of thermal conversation, we validate and extend a new method of setting the initial nodal temperature on the joint face in this paper. The result of temperature field simulation shows that this method has good accuracy in three-dimension temperature field simulation.
The Study on Ductility of Thin-Walled Square Concrete-Filled Steel Tubular Short Columns Configured with Binding Rebars
Authors: Wang Hai Chao , Ge Yue Zhen , Li Pei Kui
Published: September 2011

To better solve the problems of local buckling and stability of thin-walled concrete-filled steel tubular short columns and improve the ability of specimens’ overall deformation, long or short binding rebars were set up and anchored on the inner surfaces of the steel tubes; meanwhile the static load test was performed. The results show that the main factors affecting the bearing capacity are steel pipe wall thickness, concrete strength, binding rebars in turn and the ductility is concrete strength, binding rebars, wall thickness. Long or short rebars also significantly improve the deformation properties of specimens. Taking the common specimens’ average ductility factor of 2.30 as a benchmark, the average factor of specimens configured with short rebars is 2.85, increased by 24% and configured with the long is 3.34, increased by 45%. Deformation properties of the specimens substantially increase and security of the structure enhances after setting up rebars.
Nonlinear Analysis on Flexural Behavior of RC Beam Strengthened with CFRP Sheets on Lateral Side
Authors: Hong Yi Hong , Wu Yi Li , Xie Xian Song
Published: September 2011

The technology of strengthening RC beam with CFRP sheets is now a hotspot of research in civil engineering. The FEM analysis was made for the whole deformation course of the flexural behavior of RC beam with CFRP sheets on lateral side, and the result was coincided with the experimental results.
An Atomic Modeling Method for the Buckling of Carbon Nanotubes
Authors: Gao Bin , Yang Bao Guo , Sun Yu Zhou , Yang Lin Feng
Published: September 2011

An atomic scale modeling method is provided to study the buckling behavior of the single-walled carbon nanotubes. The Brenner potential is employed to describe the C-C atomic interaction,and the stable state is determined using the Norton’s method with the first- and second-order derivatives of the total energy with respect to the atomic coordinates. The reponse of single-walled carbon nanotubes under the axial compressive, twisting and buckling loads is modeled using the developed Fortran codes, and the buckling patterns are obtained. The proposed method can be used to study the mechanical property of cabon nanotubes and explore its application in the cement composite in future.