bluuebunny/crossref_metadata_2025 huggingface dataset:
Nonlinear Analysis of Hysteretic-Friction Isolation System with Displacement-Constraint Device
Authors: Zhao Gui Feng , Ma Yu Hong , Zhang Yong Shan , Sun Zuo Yu
Published: September 2011

For the displacement-constraint device with hysteric-friction isolation system, the judgment condition of soft-collision between the isolation layer and displacement-constraint device is put forward, the motion equation of the isolation system in consideration of friction and soft-collision is established, the nonlinear analysis program is worked out, and several kinds of inflection points in the program are given and the corresponding processing method of the inflection points is introduced. The nonlinear response analysis of the isolation system results indicate the displacement-restraint device can ensure the upper structure safety; also can decrease the displacement of the isolated layer.
Study on Seismic Response and Shock Absorption for High-Rise Reinforced Concrete Frame Structure
Authors: Yin Xiang Chao , Sun Zhe , Li Xue Ling
Published: September 2011

This article mainly studied the seismic response of high-rise RC frame and the damping effect with viscoelastic damper. Taking a reinforced concrete frame structure of 12 layers as the research object, six schemes of damper installed were designed and the dynamic characteristics of these schemes were analyzed. The time history response analysis of 3D Tianjin waves was studied for the six schemes under frequent earthquake. The results show that seismic capacity of the structure could be significantly enhanced with dampers under frequent earthquake. Meanwhile, different damper installations also can make the structures have different damping effect.
Research for Visualization of Mining Subsidence Prediction Based on Matlab
Authors: Zhao Ya Hong , Hao Yan Jin , Ren Lu Yang
Published: September 2011

In this paper, a program is developed based on Matlab, in which subsidence value of any shape face of a single point, and multi-points were calculated, generated five mobile deformation curve was displayed, two-dimensional subsidence and three-dimensional visualization to display and data query functions were realized and verified through 2 examples. The results of the program can be intuitionistic and scientific basis for future damage caused by underground mining.
Soil Moisture Dynamic Discussed of the Exchanging Vegetation Reconstruction of Ying Rui Highway in the Spring
Authors: Long Chun Ying , Zhang Hui
Published: September 2011

With interchanging vegetational reconstruction of Ying Rui highway as the research object, using Drying method as principal combining with TDR method,carry out communication areas of different vegetation types and different matrix types of slope area of dynamic monitoring soil moisture in the spring, the results show:Soil moisture content in spring declined as time goes on from March 8, to April 7 day. Dynamic general trend of soil moisture declined from 6：00 am to 6 :00pm,the soil moisture content overall drop which slightly fluctuates after afternoon, but has no obvious peak, and increases again after evening .The soil moisture content of two kinds of reconstruction models varies with different soil layer thickness:0-20 cm soil shows trees reconstructing model >shrubs reconstruction model ;20 to 40 cm soil shows bush rebuild model> trees reconstruction model.
Research on the Three-Dimensional Information Extraction of Urban Buildings from Single QiuckBird Remote Sensing Image
Authors: Wang Jing Wei , Jiang Yan , Zheng Guo Qiang
Published: September 2011

The three-dimensional information of urban buildings is an important issue in urban monitoring, urban planning, urban management and various economic activities. In this paper we introduce a probabilistic approach of urban buildings’ height and location extraction on remote sensing image. According to the distance between the corner of building roof and its shadow on remote sensing image, buildings’ height can be extracted from single remote sensing image and buildings’ location also can be extracted from the classified image. Compared with the measured values, the absolute error of extracted urban buildings’ height and location is less than 1 m. The method is simple, fast and efficient, and is useful in the three-dimensional information extraction of urban buildings.
Web Publication of 3D Terrain Based on Java3D
Authors: Tian Mao Yi , Wang Xing , Wang Jing Wei
Published: September 2011

A system model for web deployment of 3D terrain which mode is Browser/Server based on J2EE tri-tier system framework is given in the paper. Technology of Applet, JSP, Servlet, Java3D and BC4J has been integrated in the model. The main idea of this model as follows, using Java3d to develop the Applet that can interact with user, and the Applet embeds in web page of JSP. The Applet applies agent server, BC4J to communicate with server of Oracle database. The experiment shows that this model has some certain superiority.
Stability Evaluation on High Rock Slope of Open-Pit for Ash Storage
Authors: Duan Bao Fu , Zhang Meng , Lv Yan Xin , Zhai Cheng Bo , Weng Xian He
Published: September 2011

Slopes of open-pit mine and ash storage are likely to occur the geological disasters of landslides, collapse, ground deforms and so on, due to geological structure, mining activity, etc. Lai Zhou Power plant is going to use the open-pit of Cang Shang gold mine as the ash storage field. Therefore, the long-term stability of the slope is of great significance. Through the geological investigation and analysis of open-pit mine slope, the conditions of geological and tectonic are summarized. On the basis of field monitoring, the stability of the slope is analyzed in detail. The estimated results can better correspond to the actual stability of the open-pit slope. Feasible practical control scheme and monitoring program are put forward according to the engineering practice
Liquefaction Features in Mianyang Region in Wenchuan Earthquake
Authors: Wang Wei Ming , Cao Zhen Zhong , Chen Long Wei , Yuan Xiao Ming
Published: September 2011

In Wenchuan earthquake, liquefaction and relevant damage in Mianyang region were significant and of the three major regions, but the liquefaction phenomena were clearly different from Chengdu and Deyang regions. Through field investigation and engineering geological data analysis, this paper studies the liquefaction features and distribution in Mianyang area. Analysis shows that: (1) Liquefaction zones (belts) mainly were located in Youxian area of Mianyang city, Jiangyou city and Weicheng-Dongxuan town area; (2) Liquefaction has been observed in regions of intensities VII and VIII, but mainly concentrated in intensity VII; (3) Heights of water-jet were about one meter with the highest 3-4m; (4) The ejected materials in liquefied sites basically covered kinds of soil types, i.e., nearly 80% of fine sand followed by 11% of gravel; (5) Liquefied zones were associated with cracks, resulting in farmland, houses, a railway station, schools and factories damage in different extents. Jiangyou railway station is the most typical example of gravelly soil liquefaction. (6) The liquefied soil in Mianyang region is mixed, e.g., liquefied layers were gravel layers in Jiangyou city; sandy layer liquefied in Youxian area of Miangyang city; and the liquefied soil was probable gravel or sand in Weicheng-Dongxuan town area but the gravel liquefaction possibility was high
Analysis for Drain Design of a Especial Rock Slopes under Rain Infiltration
Authors: Li Peng Yun , Wei Li De , Liu Yu Bo
Published: September 2011

The study is still few for the slopes of rock with low permeation，which has interfaces for rain infiltration and no interface for effusion. The stability of slope with rainfall infiltrating under different drain condition is evaluated by the global safety factor, based on the limited equilibrium methods. The following conclusions are obtained: (1) the two rows of drains don’t enhance the value of safety factor very much, and the layout of only one row of drains is advocated；(2) the effect of the system in which drains beat in marlite is better than the system in which drains beat in the breccia；(3) the effect of the system in which drains are designed in the toe of the slope is best, and the spacing of the drains whose diameter is 0.11 m should be less the 8m .
Incorporating Set-up Effects into Pile Design
Authors: Liu Jun Wei , Yu Feng , Qi Kun
Published: September 2011

The increase in pile bearing capacity with time after installation is known as soil/pile set-up. A mechanism of pile set-up is discussed in detail and a three-phase model is suggested. A serious of low-strain dynamic tests on full scale pile was carried out in mixed soil for monitoring the increase of wave velocity and stiffness. Wave velocity and stiffness have similar increase trend, but the stiffness shows a larger increase rate. An optimized design procedure to incorporate the pile set-up effects is proposed.
Small Strain Dynamic Characteristics for Soils
Authors: Guo Xiao Xia , Sun Ri Sheng
Published: September 2011

Based on modern ideas of thermomechanics, small strain dynamic dissipation function of Hardin-Drnevich model for soils is formulated using the assumptions of the beeline and the skeleton curve shift laws. The first and the second threshold shear strain are proposed. Both the two threshold shear strains do depend significantly on the dynamic parameters for soils. Comparison between the results of eight kinds of cohesionless soils, it is shown that the two threshold shear strains decrease when the maximum dynamic shear modulus coefficient and exponent increase. The first threshold shear strain basically does not change with the change of internal friction angle. However, for the second threshold strain, a monotonically increasing function and monotonically decreasing function can be used to model the change with respect to the internal friction angle for the beeline and the skeleton shift stress respectively.
Parameters of Muzhuping Landslide in the Shuibuya Reservoir
Authors: Zhou Jian Jun , Xie Ke Ke , Chen Lei , Gong Zhi Peng
Published: September 2011

Landslide is common geological hazards to the hydropower reservoir. Reasonable parameters are the key to design and prevent the landslide. After geological exploration, a few laboratory tests (uniaxial compression test, unsaturated permeability test, unsaturated direct-shear test) were conducted for the sliding mass. In order to obtain reasonable strength parameters of sliding mass, basing on the experimental results, some researches (such as engineering analogy, parametric inversion) were performed by using limit equilibrium method. The mechanical parameters of the slope were proposed.
Research on Ultimate Friction’s Depth Effect of Soil around Bored Pile
Authors: Zhang Xue Feng , Ma Ye , Song Chong Xia
Published: September 2011

Through carrying out the experiments of unit pile model to simulate the different force conditions of bored pile buried in different depth of soil,and combining with the finite element numerical simulation, This paper studies the bored pile ultimate friction resistance of the soil depth effect, and provides reference for engineering design and scientific information.
Dynamic Consolidation Test Study on Silt and Silt Soil
Authors: Xu Yao , Li Shu Cai , Zhang Xiao , Yan Bin , Zhu Chun Mei
Published: September 2011

A dynamic consolidation model of double layered foundation of saturated soil and unsaturated soil is proposed. Mechanism of dynamic compaction treating on double layered foundation is studied by the model. On the base of the mechanism a new technology called soil-mound dynamic consolidation can be applied to treat the ground of saturated silt and silty clay with high groundwater level. The water-pore pressure test, static cone penetration test, settlement plate test are applied to evaluate that of the new technology with different construction parameters. The treatment effect is more remarkable than that of plastic drain-dynamic consolidation.
Orthogonal Test for Impact Factor of Rigid Frame-Continuous Combined Bridge
Authors: Zhou Yong Jun , Zhao Yu , Song Yi Fan
Published: September 2011

It is reported that the impact factor is influenced by many parameters, whereas in most cases the impact factor is only related to the main span or the fundamental frequency of the bridge. In order to study the sensitive influence parameters of the impact factor for rigid-frame continuous combined bridge, based on the bridge-vehicle coupled vibration, nine influence parameters are considered ,which include the ratio fundamental frequency of vehicle to bridge, the mass of vehicle, the roughness of deck, the damping ratio of vehicle, the velocity of vehicle, the driving mode of vehicle, the rigidity of bridge, the arrangement of bridge and the soil-structure–interaction mode, then orthogonal test table is employed to study the structural impact factors in the critical sections under those parameters respectively, thus the sensitive parameters are derived. The results show that the ratio frequency of vehicle to bridge, the roughness of deck, the velocity of vehicle are the sensitive parameters affecting the impact factors. Therefore the impact factor should be interpreted as the function of muti-parameters rather than of only one parameter.
Soft Soil Microstructure Character Analysis with CT
Authors: Yuan Ze Xun , Mao Ling Tao , Zhao Dan , Chi Zhen Yu
Published: September 2011

In this paper, CT technique is applied to observe soft soil of different depth , and microstructure characters are analyzed combined with scanning electronic microscope (SEM) and mercury intrusion method. CT images comprehensively reflect the soil microstructure, while every voxel of CT image can be observed with SEM. CT images grey value can reflect the porosity variance, and grey value variance express homogeneity of soil microstructure
Corrosion Mechanism of Similar Soil Slope Corroded by Acid Mine Drainage and its Reinforcing Treatments in Metal Mines
Authors: Zhao Jiang Qian , Ju Hai Yan , Li Jian Hua
Published: September 2011

Based on the investigation and analysis of acid sewage quality component in some metal mine, and combining with the investigation on the engineering geology and the character of similar soil slope, the interaction and corrosion mechanism are studied between acid mine drainage and similar soil slope, it shows that the AMD changes the microstructure of rock-soil, displace and dissolve the integrant, magnify the structural scale, and hasten the new rift. The reinforcing treatments are proposed about using vetiver to consolidate the slope. The result from the practice shows that it has perfect mechanical effect using veriver to protect slope, and it is available to protect the similar soil slope, reduce the slope erosion-damage, and improve the slope stability.
Mechanical Deformation Characteristics of Hard Rock in Deep Excavation
Authors: Lv Ying Hui , Yan Bin
Published: September 2011

In the process of deep tunnel excavation, the surrounding rock mass, which often endures high initial geo-stress, is in the state of typical unloading. As the adjustment of stress induced by excavation, rock mass behaves a peculiar kind of mechanical deformation characteristics, different from those in loading conditions. As thus, a series of representative unloading tests on hard granite from DaGangShan power station in China, which is being excavation at 1500 meters deep below earth surface, are carried out to simulate dynamically excavation process for studying the peculiar mechanical deformation characteristics. On the basis of unloading tests, a series of research results are acquired as follows： (1) Under unloading condition, lateral deformation occurs in the unloading direction and volumetric strain changes from compression deformation to dilation deformation. (2) Under unloading condition, hard granites behave brittle failure and Mogi-coulomb criterion can well describe the failure characteristics. (3) According to curves of unloading tests, the constitutive model is deduced for simulation analysis.
A Project Practice about the Foundation Treatment of a High-Rise Building with Large Space Requirement at the Ground Floor
Authors: Dong Hong Guo , Wei Wen Kang , Zhang Huai Wen
Published: September 2011

During the design of foundation of a high-rise building with large space requirement at the ground floor, CFG piles are used in substitution for cast-in-place piles. By advanced design and construction, the project was completed successfully. In this paper, the experience was introduced according to the procedure of actual construction.
Study on Calculation Method of Stresses under Embankment
Authors: Xiao Hong Bin , Wang Yue
Published: September 2011

In China high-speed railway engineering practice, embankment settlements calculated values were often greatly different to the measured values, which may result from the stresses distribution under the embankment usually simplified. According to this issue, the elastic embankment method was introduced, the stresses under various embankment were calculated, the influence factors of the stresses values and distribution were analyzed. The stresses calculated by elastic embankment method, proportional load form and uniform load form were compared with the measured stresses. The relationship among the four kinds of stresses was analyzed. The applicable conditions of the various calculation methods were put forward. If the ratio of embankment half surface width and height was less than 4.5, when the stresses calculated by uniform load form were multiplied by correction coefficient 1.15, they were tallied well with the measured stresses.
Influence of Joint Set with Different Angles on Rock Behaviour and Cavern Stability
Authors: Ma Hai Ping , Wang Jing , Zhu Wei Shen , Yong Min
Published: September 2011

Using DDARF method, the uniaxial and biaxial compression experiments of double-fractured rock samples are numerically investigated. Influences of different fracture angles and confining pressures on behaviour of rock samples are studied. Moreover, the fracture process, the crack initiation stress, and the peak strength of the fractured rock under both uniaxial and biaxial compression tests are obtained. The results are used to obtain the strength envelope and to analyze the rock stability of an underground project as a case study.
Effect of Complex Initial Stress Conditions on Dynamic Deformation Behaviors of Compacted Loess
Authors: Cheng Da Wei , Luo Ya Sheng , Yang Li Guo , Chen Xi
Published: September 2011

In practical projects, foundations or roadbeds soil is usually in complex initial stress states, and deformation and settlement may happen caused by earthquakes or other dynamic loadings. Since conventional laboratory soil test cannot authentically reproduce dynamic behaviors of soils under complex initial consolidation stress conditions, dynamic deformation behaviors of compacted loess is conducted under complex initial stress conditions through remodeled DTC-199 torsional cyclic load triaxial apparatus. The paper systematically investigated the effects of different initial stress state, such as average principal stress p0, the angle of initial principal stress α0and the initial intermediate principal stress coefficient b0, etc. on dynamic shear modulus Gdand damping ratio λ. Results show that: (1) To the same γd, Gdincreases with the increase of p0but the α0and b0have no influence on Gd. (2) The α0has a little influence on λ and the p0and b0 have no influence on λ.
Effect of Compaction Degree on Soil-Water Characteristic Curve of Chongming Clay
Authors: Qian Jing Song , Lu Hang
Published: September 2011

The soil-water characteristic defines the relationship between the soil suction and gravimetric water content, w, or the volumetric water content, θ, or the degree of saturation, S. It is a convenient method to predict water content in the subgrade using the curve. But in the field tests of subgrades, the compaction degree of soil became lower with time than initially designed. With the purpose of finding out effect of compaction degree on soil-water characteristic curve, a study to the SWCC (soil-water characteristic curve) of Chongming low liquid limit clay using filter paper method was carried out and is presented in this paper. Specimens of different water contents were prepared by absorbing different amount of water, in order to better simulate the process of wetting of subgrade soil. After the filter paper test, the soil-water characteristic curve was fitted with two models, and then the effect of compaction degree on the curve was analyzed. The figures show that the compaction degree of the specimen will decrease with higher water content, and from the gravimetric water content-matric suction curve, it is found that compaction degree has an effect on air-entry value and water storage capacity.
Analysis of Slope Stability for West Project of Side Slope in XiaoLongtan Opencast
Authors: Song Zhi Fei , Wang Xiao Ting , Peng Hong Yan , Zhao Hong Ying
Published: September 2011

There have some advantages like as Good working conditions, High Security, Guaranteed production capacity and Low loss for Open pit mining, therefore the degree of opencast mining increasing. In this paper numerical simulation and limit equilibrium are used for Stability of west project of side slope which are under the conditions of Normal and Saturation. Draw slope stability results under the two conditions in order to take appropriate measures to provide appropriate post- mining safety protection.
Numerical Simulation of the Rock Bolts Non-Destructive Testing Based on ANSYS
Authors: Sun Xiao Yun , Cheng Jiu Long , Wang Yun Sheng , Zhang Dong Fang
Published: September 2011

A numerical simulation method of the rock bolts non-destructive testing based on ANSYS is presented. ANSYS/ LS-DYNA which is a kind of software of rock bolts dynamic finite domain analysis is used to establish a three-dimension model, after sine curve excitation is loaded, the reflection curve of naked rock bolts, or rock bolts with different defects are got, and the relationship curve between elastic modulus and stress wave velocity are got correspondingly. Experiment result proved that the aboved method was satisfied to simulate the stress wave propagation and the reflection situation in the rock bolts.
Numerical Study on 3D Surface Crack Growth
Authors: Li Ming Tian , Li Shu Cai , He Jun Lian
Published: September 2011

The inclined surface cracks are under the mixed mode I，II，III loading conditions. In order to study the surface crack growth the stress intensity factors of the front of half-circular surface crack are calculated according to fracture analysis code-3D(FRANC3D). And the influences of inclination angle of the surface crack and the orientation angle on I，II，III mode stress intensity factors were analyzed. I mode stress intensity factor increases along the crack front with increasing inclination angle. And I mode stress intensity factor of the same inclination angle is symmetrical with respect to the orientation angle of 90 degree. II，III mode stress intensity factors are the maximum when the inclination angle is equal to 45 degree. And the behavior of II，III mode stress intensity factors along crack front for the inclination angle of 15 and 30 degree is identical with that of inclination angle of 75 and 60 degree, respectively.
Novel Computational Implementations for Stability Analysis
Authors: Huang Qi Wu , Jia Cang Qin , Xia Bo Ru , Wang Gui He
Published: September 2011

By exploring the nature of the analogy between optimum trusses and optimum layouts of discontinuities, a novel numerical analysis method for rock/soil masses is proposed in this paper. The procedure is used to determine the critical layout of discontinuities and associated upper bound limit analysis for stability problems. The alternative approximation procedure to the traditional finite element method might involve discretization of a given body using a suitably large number of nodes laid out on a grid, with the failure mechanism comprising the most critical subset of potential discontinuities interconnecting these nodes. Potential discontinuities which interlink nodes laid out across the problem domain are permitted to crossover one another, giving a much wider search space than when such discontinuities are located only at the edges of finite elements of fixed topology. Highly efficient SOCP (second-order cone programming) solvers can be employed when certain popular failure criteria are specified (e.g. Hoek-Brown and Mohr-Coulomb). Stress/velocity singularities are automatically identified and visual interpretation of the output is straightforward. Several numerical examples including rock slope are studied by the new method, and the results are very close to those calculated by using analytical method and FEM.
Bridge Design Basic Wind Speed Based on the Joint Distribution of Wind Speed and Direction
Authors: Ye Zheng Wei , Xiang Yi Qiang
Published: September 2011

Based on the method of separation of wind speed and direction variable, considering the wind direction frequency function, ascending order to calculate the probability of the actual distribution of the sample, extreme type Ⅰ (Gumbel) and three parameters of extreme type Ⅱ (Frechet) and extreme type Ⅲ (Weibull) probability distribution to fit the sample, this paper has analyzed the weather station observations of 34 consecutive years of the joint distribution of wind speed and direction near to a huge bridge, gained the basic design wind speed in different directions, comparatively analyzed the impact of the sampling interval of change on the basic wind speed as well. The results shows: wind speed in different directions at the same location or different sampling intervals samples of the wind speed sample may be subject to different types of extreme value distribution, should separately fitting; different wind direction frequency of extreme wind speed occurrence and the basic wind speed there are certain differences, taking into account the joint distribution of wind speed and direction is necessary to determine the design basic wind speed of the bridge, and will be conservative without considering the joint distribution; for the same sample wind speed matrix, the shorter the sampling intervals, the optimal distribution of the higher probability model fitting precision, the smaller the basic wind speed, the more economic and reasonable the results.
Simulating Responses of Buried Steel Pipe Crossing Reverse Fault
Authors: Zhao Lei , Yang Jian Zhong , Zhao Jin Xin
Published: September 2011

The responses of the buried pipeline due to reverse fault dislocating are studied by a 3-dimension shell finite element model with equivalent boundary spring in ANSYS program. The calculating length of the model is determined by dip angle of the reverse fault: The length is 150 times pipe diameter when the angle is equal to or bigger than 45°; but the length is 240 times pipe diameter when the angle is less than 45°. The finite element model is fit for computing that dip angle is less than 80°. Results show: Failure modes of the pipes are determined by dip angle and dislocation value of the fault. When the angle is gentle and the dislocation is small, either local buckling(wrinkling) or beam buckling can be happened. The angle is equal to or bigger than 75°, local buckling and beam buckling can be happened at same time.
Novel Hanger Design to Improve the Robustness of Through Arch Bridges
Authors: Wu Qi Ming , Yang Dang Qi , Cui Fei , Yi Xiao Wei , Jiang Rui Juan
Published: September 2011

Hangers in through arch bridges are important components since they suspend the bridge deck from the arch ribs. Local damage at a hanger may lead to progressive damage of various components in the arch bridge or even progressive collapse of the bridge. In this paper, the conventional design of double-hangers in through arch bridges is reviewed. Then a new approach to design the double-hangers is put forward. The suitability and robustness of this approach is then verified by a numerical simulation of a real through arch bridge. The impact effects induced by local hanger fracture on other structural members are simulated by dynamic time-history analyses. The new approach to design the hangers for through arch bridges is shown to improve the structural robustness. With the application of the new way put forward here, when one or more hangers are damaged to fail, the through arch bridge will not be endangered and will still maintain the overall load-bearing capacity during an appropriate length of time to allow necessary emergency measures to be taken, which illustrates the leading principle of structural robustness well.
Green Building Design Practices - Analysis of the Design of Leisure Office Center
Authors: Feng Wei , Li Hui Min
Published: September 2011

Through the design practice of the green Leisure office center building, the paper discusses the technical measures of ecological architecture, and makes an in-depth analysis of the use of solar energy, natural ventilation and daylighting technology, water conservation measures, material recycle technology, sound insulation technology and other energy saving technologies. In addition, the paper summarizes the technical measures suitable to China's national conditions, which can be regarded as a reference for other design practice so as to promote the development of green building.
Study on Housing Performance Evaluation Model Based on Hierarchical Potential Support Vector Machine
Authors: Tian Bo Jing
Published: September 2011

Housing performance is an important and widely studied topic since it has significant impact on architecture design and programming. In terms of problems existing in the field, a new support vector machine technology, potential support vector machine, is introduced and then combined with decision tree to address issues on supplier selection including feature selection, multi-class classification and so on. And the methodology proposed in the paper, which is proved to the strengthens of integrating knowledge and experiences from experts in the paper, can be applied in housing performance evaluation which is one of complex issues combined with processes including not only quantitative, but also qualitative analysis.
Discussion of Evaluation Index in Probabilistic Slope Stability Analysis
Authors: Wu Zhen Jun , Wang Wei
Published: September 2011

Probabilistic slope stability analyses have been adopted in study and geotechnical practice. But there are many misconceptions in the literature. One of these is the evaluation index of slope. The evaluation index will not always have the same meanings for the different slip surfaces. There are five kinds of slip surfaces in probabilistic slope stability analysis: slip surface of minimum factor of safety at mean parameters, mix slip surfaces of minimum factor of safety during each iteration, slip surface of minimum reliability index, slip surface of minimum factor of safety at specific parameters combination and slip surface of minimum factor of safety during each iteration in first order reliability method. For different slip surfaces the evaluation indices may be different. The relation among these evaluation indices is discussed and the applicability of the evaluation index is suggested.
Isolation Effect Analysis for Hong Kong-Zhuhai-Macau Bridge
Authors: Wang Tao , Li Yu , Ning Jing , Li Yan Wei
Published: September 2011

According to the behavior of seismically isolated continuous bridges, the bidirectional nonlinear characteristics of lead rubber bearing are taken into account by using two orthogonal nonlinear level spring elements. Based on the FEA software, the analysis models of seismically isolated and non-isolated continuous bridges are established. And the nonlinear seismic response for these analysis models is carried out under the function of the reasonably chosen seismic motion. The analytic results indicate that the natual period of seismically isolated bridge can be prolonged to avoid the principal period of ground and the seismic energy of structure can be efficiently consumed by the hysteretic energy dissipation of lead rubber bearing. So the response of bridge structure can be reduced to make sure most of the component work in the elastic phase and the structure can be well protected.
Research on the Key Technology in Steam Curing for 32m Simple-Supported Box Girder of High-Speed Railway
Authors: Li Xue Min , Zhu Er Yu , Zhou Yong Zheng , Qin Yue Hong
Published: September 2011

In the process of steam curing to high-speed railway’s simply-supported box girder, there are some problems must be faced such as the difficulty to determine steam curing system and to achieve automatic temperature control. With the construction site conditions of simple-supported box girder in Longwang beam field which is located on Shijiazhuang-Wuhan (Shi-Wu) section of Beijing-Guangzhou high-speed railway, the paper proposes the appropriate steam system for simply-supported box girders, determines the appropriate equipments, explores the temperature control system in the process of steam curing to the simply-supported box girder's concrete, and takes the temperature test of steam curing in the field. Results show that, the steam curing technology in this paper can increase the production efficiency of beam in production site, and effectively guarantee the prefabricated quality of simply-supported box girder.
Temperature Field Test and Research of Box-Pier and Box-Girder for Long Span Continuous Rigid Frame Bridge
Authors: Wang Jie Jun , Yang Ke Ke , Yin Can Bin
Published: September 2011

Longtan River Bridge, which the length of the main span is 200m and the height of the main pier is 178m, is a long span continuous rigid frame bridge. Temperature field of the box-pier and the box-girder due to solar radiation were measured. Regression analysis of the temperature difference has been done by using the least square method, and the fitting curve of the vertical and the transverse non-linear temperature difference distribution of box-pier and box-girder are obtained in this paper
Study on Space Nonlinear FE Model of Composite Beam Cable-Stayed Bridge with Three Towers
Authors: Wang Feng
Published: September 2011

Taking Wuhan Erqi Yangtze River Bridge as an example, based on link element, shell element, and beam element, a double beam nonlinear finite element model is purposed using popular finite analyzing software ANSYS. The internal force and deformation characteristics of composite beam cable-stayed bridge with three towers is analyzed by double beam model, and compared to the single beam. The results show that the double beam nonlinear FE model, which have less freedom and conveniently calculate, can be used to well analyze the nonlinear of composite beam cable-stayed bridge with three towers.
Research about the Dynamic Ice Response of Concrete Structure in Environment with Freezing-Thawing
Authors: Liu Yu Ping , Li Shu Cai , Zhang Feng
Published: September 2011

The several familiar ice-structure interaction models were established according to collision dynamics theory. The numerical simulations of the ice-structure interactions were implemented by using the explicit dynamic analysis software ANSYS/LS-DYNA, according to the concrete reduction model and bi-axial strength criterion established by indoor test after freezing-thawing damage. The simulated ice force and structure displacement response were presented using ice sheet with a certain constant speed moving to the structure. What more, the effect of super bridge system is taken into consider in simulation models. The simulated results show that the ice forces applied on structure are insensitive to alteration by ice velocity, and the circular structure and the rectangular one are unlikely to generate ice-induced vibration because of the effect of super bridge system.
Experimental Research on Using Heat Shrinkable Material to Protect Prestressed Anchor
Authors: Zhu Li , Cheng Tian Xing , Zhu Er Yu , Lv Xiao Yin , Zhou Yong Zheng
Published: September 2011

nchor is the key component for force transmission of prestressed structure. It is difficult for the current sealing technology of anchor to ensure the normal performance of strand. And it will directly affect the bearing capacity and durability of the whole prestressed structure. The advanced method abroad smears anti-corrosion grease at the end of anchor, and then covers it with plastic cap. Based on the national patent: the method of using heat shrinkable material to protect prestressed anchor(patent number: ZL200710304303.2), some experiments of using heat shrinkable material to protect anchor are carried out, such as the construction technology verification, the electrical insulation and the sealing experiment, and anti-stripping experiment. The results show that the method of using heat shrinkable material to protect anchor has the advantages of simple and reliable construction technology, short construction period, low cost, good electrical insulation, high sealing property and anti-stripping strength. This method can protect the anchor of prestressed system very well, and has wide application value.
Research on Interfacial Bond Behavior of Prestressed CFRP Sheets Strengthened SRC Beams under Symmetry Concentrated Loads
Authors: Ha Na , Fu Shen Yuan , Wang Lian Guang
Published: September 2011

The main form of interfacial bond stress between prestressed CFRP sheets and the beams of steel reinforced concrete(SRC) are interfacial shear and peel-off stress. The effective transfer of adhesive stress is the fundamental to ensure the structure bearing capacity improved after strengthened. According to the principle of minimum potential energy and combining with the mechanical behavior of prestressed CFRP sheets and the beams of SRC, the calculated formulas of interfacial shear and peel-off stress are deduced under symmetry concentrated loads. The influences of initial strain and the layer of CFRP sheets are discussed. The calculation results show that the effective availability of CFRP sheets is increased with the initial strain increasing under the load. And the interfacial shear and peel-off stress of beam-end are increased simultaneously with the initial strain and the layers of CFRP sheets increasing, which lead to the ends of beams occurred peel-off failure easily.
The Discussion on Lateral Load Distribution Mode while Structural Seismic Analysis is Proceeding
Authors: Han Jin Liang , Li Yun Xia , Mo Zong Yun
Published: September 2011

In this study, the procedure of Pushover analysis has been put into effect, and following factors have been mainly researched in Pushover analysis: choosing the calculation model of structure and element; analyzing the yielding moment and limiting moment of cross section; posing the distribution pattern of lateral force; discussing the influence of high class mode of vibration on the structure. The following conclusions are given by analyzing a frame damaged by the seismic load with the help of the ANSYS software.
Calculation of Thermal Stress of Thick Arch Concrete Lining of Tunnel of Big Span
Authors: Jiang Mei Rong , Jin Feng Nian , Wang Bo
Published: September 2011

To control thermal cracks of concrete of thick arch lining of tunnel of big pan, based on basic assumption, the formula calculating thermal stress of arbitrary position and the maximal stress in arch lining restricted by surrounding rock is deduced. Moreover, the formula of thermal stress of arbitrary position, the maximal thermal stress is also presented, when the thick of arch lining varies according to the law of cosine. The change of temperature of concrete of arch lining in practical engineering is monitored. The maximal thermal stress in arch crown surface and the thermal stress in surface along the axis of arch are calculated using the formula deduced above is presented and is contrasted with its real strength. Conclusions show that the thermal stress in arch crown is the maximal stress, concrete lining do not crack under the condition of thermal stress less than its strength.
The Research on the Steel Asphalt Isolation Pier by a Full-Scale Masonry Model
Authors: Shang Shou Ping , Quntang Huang
Published: September 2011

In view of the universal present situation where general rural buildings has low earthquake resistance ability, this paper, based on the base Isolation theory and the steel-asphalt isolation layer, proposes the steel-asphalt isolation pier to overcome the shortcomings of relatively complex construction and inconvenient volume production. The present study has also carried full-scale model experiment on the houses of single-layer full-scale masonry structure. The result shows that with the sine wave input of different acceleration amplitude, the superstructure acceleration weakens more than 40% and gets good damping effect because a majority of seismic energy has been absorbed by the isolation pier; and when the acceleration amplitude is below 0.30 grams, the steel of isolation pier is to be at the elastic state and can reset automatically after shock, which can satisfy the requirements of the seismic design. However, in order to meet the demand of the topic research, the present study has only done experiment on the small earthquake. According to the research findings, the attenuation coefficient , on the whole, tend to increase with the increase of acceleration peak value.
Study on External Prestressed Concrete-Filled Steel Tubular Flexural Member
Authors: Xu Wei , Hou Xian Zhang , Xu Feng , Zhang Xue Fei
Published: September 2011

According to good property of concrete-filled steel tubes(CFST) when they are subjected to compression load and their disadvantage to bending load. A new type of composite external prestressed concrete-filled steel tubular structure has been presented in this paper, which has the high tension strength of prestressed tendon and good anti-compression capacity of CFST. Based on the analysis of the mechanism, the flexural capacity of the structure can be greatly enhanced. And the criterion and method is given.
The Direct Solution Method to Determine the Upper-Step’s Minimum Plane Size of Rectangular Extended Foundation under Column that Meeting Punching Shear
Authors: Huang Tai Hua , Zhou Xian Yan , Tan Ping
Published: September 2011

After determining the height of rectangular extended foundation that meeting punching shear, if the height is larger, the foundation may be divided into two or three steps. The height and width of each step is divided average generally, I think that this method is not appropriate through analyzing, the minimum plane size of upper step can be get through direct solving, all the size that is greater than the minimum plane size can meet the punching shear requirements of step, a program based on MATLAB is worked out for everyone to use.
Study on Temporary Load-Carrying System of Reinforced Concrete Structure on Construction
Authors: Cong Shu Ping , Wang Lai , Han Jin Sheng
Published: September 2011

Load-carrying system of reinforced concrete structure on construction is different from load-carrying system on service life. This temporary load-carrying system is composed of shores and concrete members of early age on construction. Geometrical model and material property of structure are time-varying on construction. Through secondary development of ANSYS, the processes of placing concrete and removing shore are simulated on construction. Critical effect factors are determined through the analysis on mechanical property of temporary load-carrying system, such as shore stiffness, foundation stiffness and diurnal temperature difference. Results of analog calculation to temporary load-carrying system will provide basis for shoring system design and structure reliability analysis on construction.
Recycling of Crushed Clay Brick as Aggregate in Concrete
Authors: Nabizadeh Rafsanjani Hamed , Chehreghani Morteza , Nourbakhsh Mohsen
Published: September 2011

Clay brick generated from construction project sites is usually delivered to landfills for disposal and thus they can damage environment. The use of crushed clay brick can solve the environmental problem. This paper presents the possible use of crushed clay brick as a construction material. This new material gathered from some construction project sites in Iran is used as 100% aggregate in the production of concrete. The results indicated that the crushed clay brick reduced the unit weight and compressive strength of concrete, and increase the water absorption value. This new concrete can be used in non-structural products.
The Study on Neutral Axis of Concrete Filled Steel Tube Component with Round Section
Authors: Yang Xue Ying , Li Yuan Mei , Dong Wen Tao , Zhang Bo
Published: September 2011

The equation to determine the neutral axis of concrete filled steel tube(CFST) component with round section is presented in this paper. The geometric equation, physical equation and static equilibrium equation of CFST are analyzed to determine its section neutral axis. The compressed mechanical properties of CFST component are analyzed with the concrete material properties divided into tension and compression parts.Comparing the numerical results with the experimental results it can be verified that the equation to determine the neutral axis of CFST component with round section is useful to solve the problems that the tension and compression material properties of concrete are different.
Calculation Method on the Internal Force of Frame-Composite Wall Structure in Plastic Stage
Authors: Wu Cheng Hao , Guo Meng , Jiang Xu Feng
Published: September 2011

The multi-grid composite wall has unique structural types, and its stiffness can be adjusted according to different anti-seismic requests and complex architectural style. Referencing the frame-shear wall structure, the cooperative work mechanism and shear-sharing ratio calculation method of frame-composite wall structure are studied systematically in this paper. Based on the fundamental theory of Timoshenko beam, the frame-composite wall structure is regarded as double anti-seismic system consisting of shear type frames and shear-flexural type beams. The fundamental differential equation is established by the continuous approach, and its analytical solution of displacement and internal force are derived. Then the practical computational method of earthquake shear-sharing ratio on the frame-composite wall structure is put forward, and the influence degree that the composite wall rigidity degenerates to the structure internal force distribution is explained through concrete examples.
Research on Hydraulic Conductivity of Coarse Sandstone under Triaxial Compression
Authors: Rong Guan , Wang Xiao Jiang
Published: September 2011

Permeability test for complete stress-strain process of coarse sandstone were carried out in triaxial test instrument. On the basis of test results, the influence of confining pressure and strain on the hydraulic conductivity was discussed. It is shown that in the complete stress-strain process, hydraulic conductivity changes in the law that presents the same character with the curve of stress-strain. The hydraulic conductivity reduces slightly with the increase of deviatoric stress in the stage of micro fracture compressing and elastic; In the elastoplastic stage, along with the expansion of new fractures, the hydraulic conductivity increases slowly at first and then reaches sharply to the maximum value after peak point; In the post-peak stage, the fracture which controls the hydraulic conductivity of coarse sandstone is compressed because of the confining pressure and the hydraulic conductivity decreases. During the process of deformation and failure, the hydraulic conductivity is more sensitive to the change of circumferential strain. With the increase of confining pressure, the increased value from initial to peak value and the decreased value from peak to residual value decreases.