bluuebunny/crossref_metadata_2025 huggingface dataset:
A Strength Model for Square CFT Stub Columns with Compact Sections
Authors: Lu Zhao Hui , Zhao Yan Gang , Yu Zhi Wu
Published: September 2011

This paper presents an investigation of ultimate strength of square CFT stub columns with compact sections. The beneficial composite action between the steel tube and the filled concrete is taken into account and a new analytical model for predicting the axial capacity of square CFT stub columns with compact sections is proposed. Experimental results of 89 axially loaded square CFT stub columns published in the literature are then used to verify the proposed strength model. Results show that the proposed strength model provides a direct, compact, and efficient representation of the ultimate strength of square CFT stub columns made with not only normal strength but also with high strength steel tubes and concrete.
Flexural-Torsional Buckling Analysis of Steel Beam with Reduced Flanges
Authors: Han Ming Lan , Wang Yan
Published: September 2011

Flexural-torsional buckling of the beam in steel frame with reduced beam section (RBS) connections is analyzed. Base on the analysis of flexural-torsional buckling of the RBS beam under different loads using energy method, the critical moment calculation formula of ordinary beam is modified, and the critical moment calculation formula of RBS beam is presented. Moreover law of the RBS beam critical moment varying with cut sizes and location is discussed when compared to the critical moment of the uniform beam. The results show that: reduction has great effect on flexural-torsional buckling of RBS beam, critical moment of the RBS beam obviously decreases as compared with ordinary uniform beam, but single cut parameter has small effect on changes in critical moment; the effect of reduction on beam stiffness decreases as beam span increases.
FE Nonlinear Analysis for Multiplanar CHS KK-Joint with in-Plane Gap and Out-of-Plane Overlap
Authors: Cui Shi Qi , Sun Jian Dong , Lv Jun Li , Yang Chun
Published: September 2011

On basis of the data from tests, FE nonlinear analysis mode on the multi-planar CHS KK-joints with in-plane gap and out-of-plane overlap (KK-OPOv) was advanced and validated in terms of failure mode, ultimate bearing capacity and etc. And the adaptability is reasonable. Moreover, FE nonlinear analysis for the joint on the typical load-displacement curve, failure behavior, failure mechanism and etc was conducted. The study suggests that the multi-planar KK-OPOv joints appear mainly in the CLD1 failure mode; at the time of failure, the tube wall deformations on the chords of multi-planar KK-OPOv joints and the corresponding planar K-Gap joints are coincide with each other basically. Both of these two types of joints are of a same failure mechanism; the multi-planar parameter ζt influences, to a certain extent, the ultimate bearing capacity on joints. That is, as the overlapping ratio of the out-of-plane braces is higher (namely, the absolute value of ζt increases), the ultimate bearing capacity of the joints decreases.
Bond Strength on the Interface between Concrete and Steel and Development Length of Reinforcing Bars in RC Structures
Authors: Sun Wen Bin , He Wei Zhong , Jiang Yang
Published: September 2011

For the analysis and design of RC structures, there is a fundamental assumption that the strain in an embedded reinforcing bar is the same as that in the surrounding concrete. Therefore, bond forces must be developed on the interface between concrete and steel, such as to prevent significant slip from occurring at the interface. An end anchorage may be considered reliable if the bar is embedded in to concrete a prescribed distance known as the development length of the bar. If in the beam the actual extended length of a bar is equal to or greater than this required development length, no premature bond failure will occur. Research has indicated that the development length was influenced by tensile strength of concrete, surface and diameter of bar, cover distance, bar spacing, transverse reinforcement, and other factors. Current design methods in different countries’ Codes, attentions are directed toward providing adequate length of embedment, which will ensure development of the full strength of the bar.
Application Analysis of Fastener Steel-Pile Scaffold in Hydropower Project Slope
Authors: Yuan Jian Jun , Liang Chuan
Published: September 2011

Taking the example of the high slope treatment of JINPIN Hydropower Station of YA LONG River, in this paper the basic requirement，construction feature and forcing characteristic of the fastener steel-pile scaffold were introduced in detail, the scaffold setting up method of the working platform in slope treatment are designed, and the loading analysis, checking computation of the strength, rigidity and stability of primary members were making. At last, this paper adopted corresponding construction measure as per the uncertain factors. This paper can provide the design basis and reference for the similar scaffold engineering by the practice of this project.
Nonlinear Consolidation Analysis of Soil-Cement Pile
Authors: Wang Chi , Xia Guo Xing , Huang Ming
Published: September 2011

A few consolidation solutions of soil-cement pile have been derived by the assumption that the coefficient of volume compressibility and coefficient of permeability of soil and pile is constant. However, the value of coefficient of volume compressibility and coefficient of permeability of soil and pile varies along depth during the consolidation process with the increment of effective stress of soft soil and pile. In this paper, the e–logσ′ and e–logk linear relationship is used to describe the stress-strain and strain-permeability coefficient relationship of soft soil. The nonlinear compressive character of soil-cement pile is considered. The semi-analytical solution is obtained by dividing the computing unit and segmenting the consolidation time. The coefficient of volume compressibility and coefficient of permeability of soil and pile can be assumed to be constant at any soil layer during any time interval. The initial conditions of computing unit can be confirmed by the calculation results of last time interval. Finally, some nonlinear consolidation properties of composite ground are analysed.
Application of Bayesian Method in Stochastic Analysis of Rock Slope Stability
Authors: Shu Qing Lian , Yang Ling Qiang , Zang Pan Ying
Published: September 2011

The analysis of structural plane in rock slope is of vital importance to stability analysis of rock slope. In this paper, Bayesian method was adopted in the analysis of shear strength parameters along the fault in the West Slope of Upper Reservoir, Shisanling Pumped Storage Power Station. Full advantage was taken of the geological information outside the structural plane along with the practical experience of on-site engineers. The statistical estimation problem of small samples thus was successfully solved. The determination of sliding plane in rock slope is another key issue in the stability analysis of rock slope. The cracking process was utilized to track the most possible sliding plane in the slope. In consideration of the randomicity of both mechanical parameters of rock and structural plane and resistance of slide resistant piles, reliability index of slope stability was established with the aid of discretized dimensional reduction method of reliability and conditional probability.
Dynamic Stability Analysis of K8 Single-Layer Latticed Shell Structures Suffered from Earthquakes
Authors: Du Wen Feng , Yu Fu Dong , Zhou Zhi Yong
Published: September 2011

Aiming at the dynamic stability of the K8 single-layer latticed shell structures, it was carried out the dynamic stability analysis based on the finite element method(FEM) in this paper. The dynamic responses of the structure are calculated using the FEM and the B-R rule is applied to determine the dynamic instability critical loads. Results show that the dynamic instability is prone to take place in the K8 single-layer latticed shell structures under the severe seismic load and the dynamic instability critical seismic wave peak value is about 0.7g. The location of instability starts from the intersection between the third circular members and the radial members, then it spreads abroad until the structure collapses.
Highway Passenger Transport Development Strategy with the Competition of High-Speed Railway
Authors: Hu Si Tao , Wang Xue Mei
Published: September 2011

With the rapid development of high-speed passenger railway and inter-city railway, highway passenger transport is facing an unprecedented competition and pressure. The impact of high-speed railway on highway passenger transport has been analysis and the transport characteristics of high-speed railway are compared with the highways’. On the basis of the travel choice behavior of passengers analysis, the systematized countermeasures of highway passenger transport are put forward including precise orientation, strengthen marketing enhancement, technical support, resource integration, brand service and government help.
Experimental Study on Bond Behavior of GFRP-to-Cement Mortar
Authors: Zhang Ning , Lu Ai Zhong , Xu Yun Qian , Cui Pan
Published: September 2011

Direct pull-out tests were performed to evaluate the bond performance of glass fiber-reinforced polymer (GFRP) reinforcing bars in cement mortar. Specimens with different bar diameters and different grouted lengths (i.e., 5d, 10d and 15d, d is the diameter of bars) are prepared for the pull-out tests. For comparison, specimens with plain aluminium alloy bars (AAB) were tested as well. The result shows that the average bond stress between plain aluminium alloy bars and cement is much smaller than that between the deformed GFRP bars and cement; thin GFRP bars tended to have larger average bond stress; the shorter the grouted length, the smaller the maximum average bond stress. Only part of grouted length undertakes the bond stress and the length depends on the shear modulus of GFRP and the surrounding material.
Coupled Wind-Induced Vibration Analysis of the Membrane Structure Based on Steady-State CFD
Authors: Sun Xu Feng , Li Shi Rong
Published: September 2011

Because of large flexibility and strong geometric nonlinearrity, the time domain method should be applied in the analysis of wind-induced vibration for the membrane structure, and the coupling effect between the structure and the fluid should also be considered. In this problem, it is hard now to solve it directly using the technique of three-dimensional transient FSI based on CFD. So in the article, a compromise schedule is proposed, i.e, for the mean wind part, the steady-state FSI technique is applied to solve the parameter such as the mean pressure coefficient, the mean wind velocity, etc, while for the fluctuating wind part, the time integral method is used based on the stochastic function of the wind velocity formed by auto regressive method. The aerodynamic damping is considered in the solving of fluctuating part and five computing schedule are compared, result shows that it is better to use positive mean wind damping for the nodes. It is also suggested that the stochastic wind velocity functuion can be revised based on the kinetic energy distribution of the reference points. A comparison between the computing and testing results show that it is greatly improved for the fluctuating response distribution of the structure.
Numerical Modelling of Multi-Step Energy Dissipation Facility in Rushing Trough
Authors: Li Yan Wei , Li Zhi Yong
Published: September 2011

Abstract：Rushing trough is often used as drainage in steep slope section, velocity of flow can be reduced and water-damage of road can also be prevented furtherly if multi-step energy dissipation facility is placed in rushing trough. In this paper, CFD method is adopted and VOF calculating model is established and turbulent kinetic energy and turbulent dissipation rate are introduced as standard to analyse energy dissipation mechanics of the facility. The factors such as height of embankment, gradient of trough, size of step and velocity of flow in inlet, which can influence efficiency of energy dissipation, are also discussed in the paper and regression formula about efficency of energy dissipation is presented. All the conclusion can guide the design of consumed energy facility.
In Situ Shear Experimental Study on Loess Landslide
Authors: Chen Xin Jian , Zhang Jing , Zhao Fa Suo
Published: September 2011

On the basis of analysis on the geological environment of highway loess landslide, three in-situ loess samples,500mm×600mm×600mm, were cut on the shear crack of landslide. The residual shear experiment of soil samples were accomplished in native state and saturated case. Compared with the residual cohesive force and residual internal friction angle of slide face soil in native state by indoor shear experiment, that of landslide shear crack soil in saturated state by in situ shear experiment is grater with the degree of 12.25% and 29.38%.The reason of difference between two experimental methods is proposed. It shows that in situ shear experiment is very important to the landslide stability analysis and the optimization of landslide engineering treating, specially to the creep landslide.
Numerical Simulation of a 100m Offshore Anemometer Tower
Authors: Li Lei , Pang Zhao Kun , Zhang Zhao De
Published: September 2011

An anemometer tower is essential for the construction of an offshore wind farm. A anemometer tower is preliminarily designed in the Bohai Bay in the north coast of China. Considering the extreme wind and wave or extreme wind and ice, at different directions, the structure of the tower is simulated by using finite element software. And the stresses and strains of the structure are calculated at the different loadcases. And then, the structure of tower can be designed using the numerical data. And finally, the dynamic characteristics of modal shape and frequencies are also discussed.
Numerical Study on Energy Dissipation and Hysteretic Behavior of Plate-Reinforced Connections
Authors: Wang Yan , Zhang Li Ya , Feng Shuang , Gao Xiang
Published: September 2011

14 models of plate-reinforced connections are analyzed by finite element software ANSYS. Failure mode, hysteretic behavior, ductility and energy dissipation capacity are comparatively studied. Results show that plastic hinge formed at the end of the reinforced plate, hysteretic cruves are full and the connections have good ductility. With the increase in length and thickness of the reinforced plate, bearing capacity increases while hysteretic behavior and ductility factor decrease. If the reinforced plate is longer than the length that design requires, brittle failure occurs in the panel zone. The recommended length of the reinforced plate is defined as 0.5-0.8 times of beam depth, the thickness of flange-plate is 1.2-1.4 times of flange thickness and the thickness of cover-plate is 0.7-1.2 times of flange thickness.
Different Geological Conditions Affect the Results of Low Strain Integrity Testing of Piles
Authors: Zhang Zhi Qiang , Yi Nan Gai
Published: September 2011

Low strain ingtegrity testing of pile is based on the one-dimensional wave theory.However, the pulse wave produced by hammer is actually 3-dimensional wave , whose propogation could be affected by the pile sides with different geological conditions. The effect is more obvious when the geological conditions of the pile sides become more complex. This test established three-dimensional finite element model which has fixed pile bottom and different geological conditions by applying ANSYS/LS-DYNA dynamic analysis method. The test simulated nine different boundary conditions of the pile sides. The results were divided into four groups to compare. And the velocity-time curve of the particle in different conditions was obtained. Through analyzing the simulation data, the conclusion that the stress wave is affected by the boundary conditions of the pile sides could be made.
A Method of Investigation of Fracture Ratio of Rock Based on Digital Image Analysis
Authors: Yang Ping , Deng Tao , Guo Hua Feng , Tang Yi Qun , Wang Jian Xiu
Published: September 2011

Fracture ratio is one of important parameters for evaluation of rock mass quality. The fracture ratio of rock is analyzed by digital image analysis with matlab. In this paper, the width of different place on fracture of rock is gotten, which is more important than average width of fracture for analysis characteristic of fracture. The area of fracture is directly gotten from the binary image of fracture and it can avoid the error of area of fracture due to average width of fracture. So the fracture ratio of area is more exacter. The practice shows that the method of digital image analysis is a good method for investigation of fracture ratio of rock.
Analysis of Problems of Unsafe Drinking Water in Rural Areas in China
Authors: Liu Zhen Hua
Published: September 2011

In the process of solving rural drinking water safety,there are some problems need to attach great importance. Evaluation index system of rural drinking water safety includes water quality, quantity, convenience, and dependability. Figure 1 shows that Polluted water is the main reason of unsafe drinking water quality, 40.9% of unsafe drinking water quality, 28.8% of unsafe drinking water. Figure 2 shows that basically the discharge of waste water each year from 1998 to 2009 is increasing, the total discharge of waste water across China from 1997 to 2009 reached to 621.945 billion t. Table 2 shows that national industrial solid waste generation and utilization is increasing,but discharge decreasing, industrial solid waste, directly or indirectly polluted water environment, especially rural drinking water sources. The paper draws a conclusion that there are some problems of rural drinking water such as rural unsafe drinking water quality, lack of laws and regulations and effective management, serious rural water pollution.
Investigation of Seismic Isolated Technology in Steel Structure Residence
Authors: Zhao Feng Hua , Yang Jun
Published: September 2011

This paper briefly expounds the basic principle of structure isolation, reviews the development process of isolated technology. Adopting the common and base isolation system and inputting El-Centro as the earthquake wave, in this paper, comparative analysis of structure’s earthquake-resistant performance was conducted on a 6-layer custom steel structure residence in Changzhou area. The result shows that the gradually matured seismic isolated technology can be applied to steel structure as well, which means the seismic isolation steel structures possess the same characteristics as other seismic isolation structures. With the satisfaction of required bearing capacity, the structural reaction to earthquake has been effectively reduced and its safety has been guaranteed after considering the seismic isolation of steel structure residence; moreover, the storey accelerations reaction has also been greatly declined, meeting higher requirements towards comfortableness of residence structure. Meanwhile, by nonlinear dynamic analysis of simple Bouc-Wen hysteretic model, the requirement towards the biggest ductility was discussed and a brief analysis of the life cycle cost of this residence was worked out. The analysis result demonstrates that the seismic isolation layer has effectively controlled the vibration of superstructure, which would contribute to the reduction of seismic hazard.
Finite Element Analyses and Design Proposals on the Truss-to-Box Girder Connection Models of Xinqiao International Airport Terminal
Authors: Wang Yuan Qing , Liu Li Yuan , Ding Da Yi , Shi Yong Jiu , Wan Hai Ying
Published: September 2011

Hefei Xinqiao International Airport Terminal is a steel structure consisting of long-span rigid frames, with 804m in length and about 161m in width at the widest part. The long-span frame consists of box columns, large curvature beams, tapered box beams and space trusses. The joints between space trusses and box beams named truss-to-box beam connections are the critical parts of the whole structure, because of the discontinuity in geometries and stiffness which result in high stress concentrations and complicated mechanical properties. GJ3-6, GJ3-5 and GJ3-1 of the airport terminal are modeled by ABAQUS. Structure internal forces at six load combinations of bearing capacity limit state are calculated. Lower chords of the landside connections sustain large tensions, while web members of the airside connections sustain large pressures. Since these truss bars are directly connected to cover plate of the box beam, better design details are recommended to reduce the stress concentrations caused by geometrical discontinuity.
Infrared Information Testing to the Tensile Necking-Down Phenomena of Metal Specimens
Authors: Wang Lai Gui , Zhang Hong Zhu
Published: September 2011

Under the action of tensile load obvious necking-down phenomena will accur in the metal test-piece. The tensile experiment about the metal test-piece has been studied, but the finite element simulation of the tensile necking-down phenomena has not been reported. The paper first studies the experiment of the mental test-piece, using the universal testing machine of WE-10A and WI-60T to load the mental test-piece and using IZ-910 infrared thermal imager to test the change process of infrared radiation temperature fields, then works out the finite element program to simulate the tensile necking-down phenomena of the metal test-piece with the elastic-plastic model. The experiment result shows that the infrared thermal effect of the metal test-piece in the process of loading is obvious, before the sample fracture will appear the omen of high temperature in the position where the future fracture will occur; in stress concentration the microcracks concentrate and the thermal figure is obvious; in the whole loading process the fracture starts from the local part, develops and evolutes gradually; with the stress change on the metal test-piece the infrared radiation tempreture of the test-piece surface changes, having the temperature-rising tendency in the total and the temperature rising trend in the local fracture position is obvious. This is because the metal test-piece material or the force is uneven and the stress concentration is formed, In the position of the stress concentration the deformation destruction firstly occurs. Because the energy is released in the process of deformation destruction, so the temperature change is obvious in the fracture position. After the experiment the obvious necking-down phenomena occurs in the test-piece. At the same time, in order to provide the theoretical basis for the experiment, with the finite element software of FEPG the finite element program is worked out, with the elastic-plastic model and the uneven material the fracture evolution process of the metal test-piece is simulated. Through the comparasion we can see that obvious necking-down phenomena appeared in the metal test-piece under the tensile load, the infrared information testing shows the temperature-rising is obvious in the position where necking-down phenomena occurs and the tensile necking-down phenomena of the metal test-piece is well simulated, which can provide helpful basis for the prediction and forecast of mental structure fracture.
Construction Process Simulation of Cable Dome
Authors: Zhang Jian Hua , Sun Ke
Published: September 2011

Construction process analysis is the difficult problem of the cable dome. A new method lifting the strut layer by layer is presented. The structure is shaped by lifting struts layer by layer from outer to inner hoop. Besides, pulling cables are installed during the construction process, large deformation can be avoided effectively and the construction can be controlled easily. To compare new construction method of lifting struts layer by layer with traditional method of tensioning diagonal cables, construction process simulations of two kinds of methods are carried out in a numerical example using the nonlinear time-varying mechanics analysis program. Results show that the new method is feasible and can be used in the actual construction. At last, some suggestions for design and construction of cable dome are made in the paper.
Ring Method Test on the early-Age Anti-Cracking Capability of High-Performance Lithium Slag Concrete
Authors: Shi Ke Bin , Zhang Shan De
Published: September 2011

Early shrinkage cracking of high performance concrete is a current hotspot of research at home and abroad.In order to make full use of local lithium-slag resources in Xinjiang,We use lithium slag as admixture of concrete to research its early-age anti-cracking capability under low water binder ratio. Ring method test on the influence of the dosage of lithium slag on its early-age anti-crak capability of concrete under the conditions of the same surface area (950m2/kg) and water binder ratio(0.27).We have obtained the best dosages of lithium slag which can resist early-age craking of concrete by monitoring concrete strain and observating concrete cracks. Therefore, the 30%dosages of lithium slag is the best for early-age anti-crack capability of concrete.
Mode Superposition Response Spectrum Method Combined with Continuum Method for High-Rise Energy Dissipation Structure
Authors: Gao Li Yan , Feng Yu Kun , Liu Wen Feng
Published: September 2011

Response spectrum curve is the base of seismic design of structures, and mode-superposition response spectrum method is a practical design method of structures. Damping adjustment factors and shape parameters have been adjusted in the new Chinese code (2010) for damping rate is not equal to 0.05. Then, a new mode superposition response spectrum method combined with continuum method is introduced in this paper. Finally, the earthquake shear of a shear-wall structure’s bottom is calculated, and the results of the new method are compared with that of traditional method implemented in PM-SATWE software which is widely used in architectural design institute. The contrast results show that the new method is available and has a good accuracy.
Study on Testing of Prestressed Sewage Tank
Authors: Yao Rong , Liang Yun
Published: September 2011

The works is relied on the mass prestressed sewage tank, the tendon loss of prestress is calculated. Value of equivalent load of tensions applied on the pool wall is gained using elastic mechanics. The stress of the concrete section is tested when prestressing tendon is stretching and during the process of feeding water. To verify the accuracy of the measurement, calculating results are compared with the measured values by using FEM model analysis software, both are relatively approach. The paper specifically gives the differences between the measured data and theoretical data and analyzes the cause. The aim is accumulating relevant test data and providing reference for the similar project.
Study on the End-Plate and Angle of Semi-Rigid Connection in the Steel Frame of Beam-Column
Authors: Xu Ling , Liu Shuai
Published: September 2011

Based on the investigation of end plate and angle of semi-rigid connection in the steel frame of beam-column, an analysis of two connection type damage phenomenons, stiffness, bearing capacity and ductility, and then with the experimental results concluded above, the similarity and differences between the two semi-rigid connections can be extensively discussed. And with that， it can naturally be concluded that the end-plate connection is a good load capacity and ductility properties of semi-rigid connection type. These for, the conclusion can provide test basis for the ideal steel structure semi-rig seismic node design and application.
The Analysis of Judging Criterion and the Influence of Shear-Span Ratio to the Failure Model in Frame Short Column
Authors: Gao Lin , Xu Guo Qiang , Chen Juan Nong
Published: September 2011

In architectural design, the discrimination to the frame short column has two judging criteria: the judging criterion with the shear-span ratio λ«2 and the judging criterion with the height-width ratio H/h«4 . Whether they have consistency has been raised attention by the engineering personnel. Through the analysis of two judging criteria, We get that: the judging criterion λ«2 has extensive applicability; the judging criterion H/h«4 is the simple calculation method, and needs certain limitations. Meanwhile, by the analysis of the relationship between the shear-span ratio and the mechanical properties in frame short column, it is concluded that the shear-span ratio has the directly affect to the failure model, and the circular cross-section frame column has better mechanical properties.
Application of PROFIBUS-DP Bus Technology to the Technical Reform of Limekiln Electrical Control System
Authors: Di Min Yan , Yao Yong , Xin Tao
Published: September 2011

It is described in detail how to develop the intelligent instrument system through connecting bus-bridge of PROFIBUS with single-chip microcomputer system of users, changing the traditional PLC-control into the data-bus control in limekiln electrical control system. This paper focuses on the development of hardware of the accompanies-station of PROFIBUS-DP, the model for user, and software design. About 400,000 dollars per each were saved and the ease of operation and the robust of control have been also improved dramatically after novel development.
Study on Extension Law of Crack Closing in Rock under Compression
Authors: Liu Ming Yuan , Zhao Yu Cheng , Xiang Zhi Quan
Published: September 2011

Based on the theory of linear elastic fracture mechanics, formulae for the circumferential stress and the initial fracture point around flattening elliptical hole under compression were derived. When considering the expansion of closed crack under pressure, by introducing the effective friction coefficient f obtained the advantages derived crack angle and the friction coefficient of the crack surface had inversely proportional relationship. Use the software RFPA2D to simulate the rock samples with pre-fracture. The results show that the plane of weakness occurred fracture firstly that lead to the weakness plane through and then formed to be cracks. With the axial displacement exerting, the through crack occurred closure, the end of the rock fracture produced a curved path expansion at the same time. The final destruction face of the rock is approximately a 450 slip-line. It shows that the final failure mode of the rock is compression and shear failure. Different crack angles make the differences of initial cracking angle, but the crack propagation mode and its ultimate failure mode are similar, while have no affect on the carrying capacity.
The Effect of the Foundation’s Rotation of the Portal-Rigid Frames on the Internal Force of the Upper Structure
Authors: Liang De Zhi , Wang Jun , Sun Li , Cui Jun
Published: September 2011

The paper focuses on the value of the foundation’s rotation of the light steel portal-rigid frames which is caused by the upper uneven loads .It analyzes the effect of the rotation of the foundation on the internal force of the upper structure. It calculates the values of the rotation and the influence to the internal force of the upper structure respectively under four different load conditions which are constant load, live load, wind load, and crane load. It draws a conclusion that the additional internal force which is caused by the rotation of the foundation is large. If not consider the effect in the design, the structure is unsafe.
Structural Health Monitoring Sensor Systems for Connected Members
Authors: You Young Jun , Park Ki Tae , Lee Kyu Wan , Lee Woo Sang
Published: September 2011

Structural health monitoring (SHM) has been applied to huge and important civil structures. Its role is for obtaining readings of sensors, analysis for data, and estimation of structural behavior and service life. Essential element is to obtain the accurate and many measurements of sensors attached to structural members for estimating reliable structural behavior and avoiding sudden collapse. Although technologies for new type of sensor and data process have been grown, there are still members those are not monitored or exactly estimated. The representative examples are the present prestress force in strand and fastening state of bolt connection. Despite the fact that failure of prestressed strand and bolt may lead a catastrophe by sudden failure, monitoring for them has not been performed fully due to the lack of practical, economic, and quantified ways. In this paper, two sensing systems were introduced. One is anchor head load cell able to measure present prestress force and another is detecting system for the loosening of bolt connection. With these sensing systems, connected members with prestressed tendon or bolt connection can be maintained successfully.
Theoretical Analysis of Shearing Capacity of U-Section Steel-Encased Concrete Composite Beams with the Full Connection Design
Authors: Zhou Xue Jun , Zhang Ting
Published: September 2011

In this article, by studying the horizontal and vertical shear performance, the calculation formula for the fully shear connection is proposed. In order to avoid the overall vertical relative slippage between the steel and concrete, the vertical slippage formula is proposed to calculate the required number of the shear connectors for the first weak plane and second weak plane.
The Experimental and Theoretical Research of the New Electromagnetic Damper Reduction on Earthquake Resistance and Disaster Reduction
Authors: Wang Xiao Tian , Zou Xiang Yang , Wang Shu Fan
Published: September 2011

It is an innovative work to make the electromagnetic damper with strong magnetic material. Firstly, the structural research and the experimental research on the basic performance of electromagnetic damper have been made. Then the theoretical research is conducted based on the above research results. Thus, the paper put forward and deduced the electromagnetic damper restoring force model and the motion parameter’s effects on its performance. Such as vibration frequency and amplitude are also studied in the paper. The results showed that the new electromagnetic damper is characteristic of simple structure and good performance and that the theoretical model coincides well with the results obtained from the experiments. Keywords：strong magnetic material, electromagnetic damper restoring force model, vibration frequency, motion amplitude value.
Study on Three-Dimensional Turbulence Characteristics of Curved Channel Flow
Authors: Wang Ri Sheng , Shi Kai
Published: September 2011

The paper presents an experimental study on three-dimensional turbulence characteristics of curved channel flow by Doppler meter .Measured the time-average velocity and fluctuating intensity and so on. Analysised turbulence characteristics of curved channel flow by the experimental data,and also compared the flow distribution of vertical、horizontal fluctuating intensity,get the conclusion.
Internal Forces and Steel Arrangement Analysis on the Steel Lined Reinforced Concrete Penstocks
Authors: Wei Zhang , Fu Chuan Xiong , Yang Lu Feng , Zhang Jin
Published: September 2011

he steel lined reinforced concrete penstocks (SLRCP) is always looked as an axisymmetric structure according to the design code, which can not show the true load-carrying capacity when considering the dam’s constraint to the SLRCP. In this paper, the physical non-axisymmetric property of the structure is simulated using the finite element method. The internal force distribution of every cross section in the SLRCP is studied, and a design method for steel arrangement based on axial force is proposed. When considering the non-axisymmetric property, the axial force in those cross sections approaching the bottom of the structure may be reduced more than 30% to the calculated value by the axisymmetric analysis. The larger the inner radius of the penstock or the thickness of the concrete wall is, the more marked the non-axisymmetric property of the SLRCP is.
Wind-Induced Vibration Response Analysis of a High-Rise Structure
Authors: Pan Yu Jie , Lv Zhong Rong , Liu Ji Ke
Published: September 2011

Autoregressive (AR) method can provide a simulation of random process with relatively short computational time and acceptable accuracy while Newmark-β Method is a quick way to accomplish the response analysis. Therefore in this paper, the combination of these two methods will solve the problem of wind-induced response analysis quickly and precisely. According to several theories, such as wind engineering, vibration theory and random process, we succeed to model 37-dimensional correlated random wind velocity and it is used for the response analysis. Then we utilize Newmark-β method to analyze successfully and the key results demonstrate that Guangzhou New TV Tower does not satisfy the requirements in the building code of China thus vibration control is needed.
The Study of Fatigue Life of Cold-Recycled Base Material Based on the Fracture Mechanics Method
Authors: Zhang Hai , Zang Yun
Published: September 2011

The method of fracture mechanics is used to analyse the fatigue crack propagation of cold-recycled base material in this paper. The suitable fracture mechanics formula and parameters are choosen and then we deduce the fatigue life forecast equation.After that we annlyse the method of determineing parameters and give the axample.The conclusion is gained through comparing with the database obtained from the experiment .It is more reasonable to forecast the fatigue life of cold-recycled base material with crack based on the method of fracture mechanics.
A Critical Review of the Istanbul Strait Transportation Policies
Authors: Alpkokin Pelin , Topuz Kiremitci Sabahat , Aksoy Goker
Published: September 2011

Istanbul is the major city of Turkey and is a typical large urban settlement facing serious problems of transportation. Amongst the others, Istanbul is unique in a way that the Istanbul Strait (Bosporus Strait) separates the metropolitan area into two main land areas creating a bottleneck and crucial traffic problems along a very strategic corridor between the two continents, Asia and Europe. The construction of the First Bridge (1973) and the Second Bridge (1988) and their beltways have highly influenced the travel and spatial development patterns in the city. Besides, the two Bridges have long been one of the main sources of traffic problems and a number of infrastruture developments, under construction or planned, will be provided for the allevaition of the congestion across the two sides of the city. However, there is an increasing call for better policy integration and evaluation in order to better fit with the aims of sustainable mobility. In this policy sense, this paper discusses the past and current policies concerning the Istanbul Strait crossings which is a very special case of urban planning and policy making practices.
A Vision-Based Lane Markings Detection and Recognition Method for Lane Departure Warning System
Authors: Chen Xiao Feng , Shi Zhong Ke
Published: September 2011

Lane departure warning system is an important element in improving driving safety and the main difficulty of which is to detect and recognize lane markings quickly and precisely. In this paper, for satisfying the quickness and precision requirement of recognizing lane markings, a novel vision-based lane markings detection and recognition method, which mainly comprise of two steps, is proposed. The first step of which is to roughly determine the ROI of lane markings by means of projection, while the next is to precisely detect lane markings by combining Hough transform with the least square method to fit straight-line. Large amounts of experiment indicate that the proposed method can rapidly and precisely recognize lane markings from sequential images.
Pond Sediments as Indicator of Traffic Related Lead Pollution in Rural Area: A Case Study from Sixian County, Northern Anhui Province, China
Authors: Sun Lin Hua
Published: September 2011

Lead concentration of pond sediments near the road, as well as pond sediments far away from roads in a rural area in Sixian County, northern Anhui Province, China, have been analyzed, and the spatial distribution of lead and the index of geo-accumulation have been brought to light. The results indicate that the lead concentrations of pond sediments near the road range from 20 to 34 mg/kg with average= 26.7 mg/kg, whereas pond sediments far away from the road have lower lead concentrations from 20 to 21 mg/kg with average= 20.8 mg/kg. The lead concentration from high to low is Xinji, Gonggou, Dazhuang, Huangwei, Yangzhuang and area far away from the road. A similarity between spatial distributions of lead concentration, index of geo-accumulation (Igeo) and towns (including village and the roads between them) indicates that motor vehicles play important role in controlling the distribution of lead in rural areas.
Statistical Analysis and Countermeasures Study on Road Transportation Accidents of Dangerous Goods
Authors: Ban Xiao Jing , Sun Chuan Jiao , Gao Jian Gang
Published: September 2011

Road transportation accidents of dangerous goods occur frequently. These accidents destroy and pollute the environment seriously, cause huge economic loses and endanger the safety of people's lives and property. 233 cases of road transportation accidents of dangerous goods which occurred during January 2008 to December 2010 were collected in this paper, accompanied by classified statistics and detailed analysis, three countermeasures have been proposed: strengthening the transport of dangerous goods management under severe weather, focusing on the daily inspection and control, implementing accident prevention measures in important region and roads. The study of this paper has important practical significance on researching how to prevent the occurrence of such accidents.
A Novel Vibration Energy Harvesting Method via Pulse Liquid Flow
Authors: Liu Qiong , Liao Chang Rong , Zhao Dan Xia , Xie Lei
Published: September 2011

Presently the electric power harvested from vibration energy by existing researches is mostly at the level of μW or mW, which is not available for structural vibration energy harvesting due to the characteristics of lower frequency, bigger mass, and higher Vibration Energy. Therefore, a novel vibration energy harvesting method via pulse liquid flow for structural vibration is put forward. The principle of the method is mainly depicted as follows: the pulse liquid flow motivated by external vibration twirls the hydraulic motor’s output shaft; then electric power is produced by the generator rotor due to the shaft torque. In this paper, the Energy Harvesting Model has been built with the help of the fluid mechanics principle and the electromagnetic induction principle. In addition, the formula for output voltage was derived and, meanwhile, the influence of the piston’s moving speed amplitude on output voltage has been analyzed as well. Ultimately, we have designed an experimental setup in order to verify the rationality of the analytical method. In our experiments, sinusoidal mechanical excitation was used to test the Energy Harvesting characteristics by the J95-I absorber testing platform. According to the results, the waveform of output line voltage is in a good agreement with the theoretical analysis, which shows effectiveness of this novel method and the worth of which to help solve the problem of dependable power supply for current semi-active vibration control systems.
Preliminary Numerical Investigation of Effect of Interceptor on Ship Resistance
Authors: Deng Rui , Huang De Bo , Zhou Guang Li , Sun Hua Wei
Published: September 2011

In the present work, the CFD software FLUENT is used to calculate the ship resistance and simulate the flow field around it. Comparison of the numerical results with experimental data of the ship without interceptor shows basically satisfactory agreement in the case of high-speed. In order to get the right parameters of the interceptor for the ship, some two dimensional calculation is taken to study the influence of interceptor with different size. The simulation of the three dimensional vessel with interceptor is also included, and the effect is discussed.
Macroscopic Simulation of Pedestrian Flow through a Bottleneck
Authors: Jiang Yan Qun , Zhang Peng
Published: September 2011

The paper deals with the macroscopic type modelling of the unidirectional pedestrian flow moving through a corridor with a bottleneck. The macroscopic model of pedestrian flow is the two-dimensional Lighthill-Whitham-Richards model described as a mass conservation equation. The characteristic feature of pedestrian route choice is that pedestrians in the corridor try to minimize the instantaneous travel time and improve the comfort level. The model equation is solved numerically by the discontinuous Galerkin method. Numerical results visualize the ability of the model to predict macroscopic characteristics of pedestrian flow through bottlenecks, i.e. the spatial distribution of the flow speed and density, as well as the formation and dissipation of traffic congestion in the corridor. They also validate that congestion is caused by the limited capacity of the bottleneck.
Interaction between Bus Stops Location and Traffic on Bus Operation
Authors: Hafezi Mohammad Hesam , Ismail Amiruddin
Published: September 2011

In bus networks there are many stations used for boarding and alighting passengers along the bus route. In designing bus stop location three sides approach to be considered; the big picture, street side and curb side. Apiece of three sides have directly affects in the bus scheduling. The effectiveness of bus operation will depend on number of bus stops and its spacing. Basically, bus stations have two kinds: bus stop, use to service passengers in one bus line and bus interchange (terminal) use to share station between some bus lines. This article described a survey on bus stop location efficiency in bus operation where study on bus stop location in three points: near-side, far-side and mid-block were considered. It has been highlighted bus stop location in situation mid-block has higher efficiency than others situations.
Evaluation on High Temperature Performance of Asphalt Mixture by Triaxial Dynamic Compression Test
Authors: Wu Chuan Hai
Published: September 2011

This paper aims to explore the reasonability of an evaluation method on high temperature performance of asphalt mixture through a series of experiements. The first step of these experiements is to formulate specimens of different high-temperature performances by Gyratory Testing Machine which simulates the on-road pavement to the most extent , and then adopt triaxial dynamic compression test to compare and analyze high-temperature performances of these specimens. By introducing concepts and indicators such as validity, reliability, discrimination, this paper evaluates comprehensively the discrimination results of various compression test parameters on high-temperature performance of asphalt mixture. It concludes that the evaluation effect of compression stiffness modulus is best, followed by the slope of logarithmic creep curve and accumulated strain area, and the evaluation effect of final compression strain is comparatively poor. That provides an objective evaluation method on high temperature performances of asphalt mixtures.
Testing Study and Numerical Analysis of Dynamic Compaction on the Red Sandstone Rubble Soil
Authors: Kuang Xi Long
Published: September 2011

The drop distance, times of dynamic compaction and other parameters are studied by on-site testing in order to analyse quantitatively the impact on effective reinforcement depth and radius of the red sandstone rubble soil. Large amounts of on-site test data shows that compactness standard is 93%, strong encryption range is 1.0～4.0m, the effective impact depth is 4～6m and the effective impact radius is 2.5～3.5m. At the same time, through comparison and verification the on-site testing data and numerical analysis, the relationship between times of dynamic compacting and sandstones subside is . Further more, it is revealed that dynamic compaction can restrain effectively the deformation of high fill embankment of the red sandstone rubble soil.