bluuebunny/crossref_metadata_2025 huggingface dataset:
Free-Field Surface Ground Motion Properties of Stratified Soils
Authors: Wang Zan Zhi , Jiang Lin Yan
Published: May 2011

In earthquake engineering, the conventional wave motion analyses usually took the subsoil as only one layered soil, and treated the subsoil by using a single freedom system model. Moreover, these methods were often adopted in time domain. In fact, the subsoil are usually stratified due to its forming in different ages, so there exist multiple interfaces which leads to multiple repeated tracings of reflecting and refracting waves in time domain analysis. To avoid the difficulties, a frequency domain analysis method is carried out for linear soil system in this paper, which allows combining all the upward waves and downward waves to a single upward wave and a single downward wave, respectively, and therefore raises great efficiency. The stochastic response analysis of the displacement of layered soils is then performed. The result indicates that, there exists the essential difference in power spectral density (PSD) between stratified soils and single-layer soil, the former has multiple peak values, while the later has only one peak value, and stratified soils have strong filtering effect in high frequency ranges, which can be considered as a low-pass filter.
Analysis on Behavior of the Steel Portal Frames with End-Plate Bolted Connections
Authors: Liu Xiu Li , Wang Yan
Published: May 2011

3D Integer models of steel portal frames are made to analyze the influence of end-plate bolted connections on internal force and displacement of frames by using finite element method. The results show that end-plate bolted connections are semi-rigid connections, and the flexibility of the connections affects the behavior of the frames, and their influences can not be ignored in the steel portal frames design and analysis.
Parameter Sensitivity Analysis of Airport Rigid Pavement Thickness Using FAARFIELD Program
Authors: Merhej Tammam , Feng De Cheng
Published: May 2011

Federal aviation administration rigid and flexible iterative elastic layered design (FAARFIELD) software program became the exclusive approved method for airport pavement thickness design adopted by federal aviation administration (FAA) in the United States after the advisory circular AC150/5320-6E “Airport Pavement Design and Evaluation” was issued in September 2009. In this paper, a sensitivity analysis was conducted to investigate the effect of FAARFIELD input parameters on the required thickness of the airport rigid pavement. The input parameters studied are: concrete flexural strength (modulus of rupture, MOR), the subgrade reaction modulus, K, subbase layers and air traffic mix .Each evaluated input parameter was varied within its recommended range to study its effect on the required thickness of the airport pavement. It was found that the concrete modulus of rupture is the most sensitive parameter on the required thickness.
Study the Relationship of Accumulation Residual Strain and the Loading Number of Completely Decomposed Granite and Cement Improved Soil
Authors: Yi Wen , Wang Yong He , Deng Tian Tian , Xiao Hong Bing
Published: May 2011

This paper based on the dynamic triaxial tests of completely decomposed granite samples of the Wuhan-Guangzhou passenger line to study the relation of the accumulated residual strain and the load times of completely decomposed granite and cement improved soil, and analyzes whether they meet the dynamic strength and cumulative cyclic deformation indicators and requirements of high-speed railway under vehicles load. High-speed driving when the subgrade generate residual plastic deformation. Residual plastic deformation of the continuous development will inevitably lead to the deterioration of the road, such as cracks, jack mud, uneven subsidence and long-term slow subsidence of the roadbed. Therefore, by studying the dynamic strength and the size of the dynamic stress of different parts of subgrade embankment to determine the appropriate filling parts of filler and control the final dynamic stress level of the roadbed at a reasonable range in order to ensure lines in good condition in the design life.
Study on the Anti-Spalling Performance of Concrete Pavement in Cold Area
Authors: Gao Song , Dai Li
Published: May 2011

In accordance with the spalling of concrete pavement in cold area, this paper puts forward a concrete proportion after making plenty of experiments, which is carried out by adding flyash, silicon powder, air entraining and water reducing admixture with different contents and proportions to normal concrete, using flexure strength, compression strength, impermeability and frost resistance as evaluating indicators. The concrete proportion reaches high flexure strength and compression strength, good impermeability and frost resistance. According to the experimental results and economic analysis, it is shown that the concrete proportion can effectively reduce spalling of concrete pavement. Therefore, it has good use value and it is promising with a good prospect of application.
Application of Fuzzy AHP to the Comparison and Selection of Cement Concrete Pavement Overlaying Schemes
Authors: Liang Ji Feng , Zhang Xie Dong , Wu Lei
Published: May 2011

Based on a comprehensive analysis of the influencing factors and special features of cement concrete pavement overlaying technology, a fuzzy analytic hierarchy process (AHP) model is constructed for the comparison and selection of overlaying schemes. At first, the numerical weight for each criterion of the hierarchy is derived and tested. Then the feature matrices of all the schemes are constructed based on experts’ evaluation. The optimal scheme is chosen according to the numerical priorities of each scheme yielded by fuzzy calculation.
Research on Influence Regularities and Evaluating Parameters of Adhesion Performance between Aging Asphalt and Aggregate
Authors: Nie Yi Hua , Dai Xu , Xu Wang Guo
Published: May 2011

In the paper, the method of prolong aging time in oven was adopted to get different aging degree asphalt, such as base asphalt and modified asphalt. Firstly, the mass loss percent during water cooking and adhesion grade were tested to evaluate the adhesion property. Then, the influence regularities of adhesion property were analyzed due to asphalt aging. Finally, the relativity between mass loss percent and adhesion grade was carried out. It is found that adhesion grade is falling, and mass loss percent is increasing with the adding of asphalt aging degree. And the study result also proves that modified asphalt has better adhesion performance than base asphalt. The two evaluation parameters have stabilization relativity. The mass loss percent is advised to use to evaluate adhesion performance for better objectivity.
Anti-seismic Analysis of Masonry-Reinforced Concrete Composite Structure Based on LS-DYNA
Authors: Liu Xiao Bin , Chen Guo Ping , Yang Ying
Published: May 2011

Previous great earthquakes have performed serious structural damages to masonry structure, which also have caused great casualties and property damage, in order to enhance the structural anti-seismic class of civilian buildings, a new kind of combined structure form is introduced in the thesis, which is formed by two parts, masonry structure and special reinforced concrete shear wall structure. The reinforced concrete part can be effective in enhancing the anti-seismic performance of masonry residence, besides reinforced concrete tube structure can also become the nearest refuge when disaster occurred, even when the whole structure collapse, it can still remain relatively complete partial structures and a large space of survival. LS-DYNA, software of finite element, is used to study the structure, simulations of the response procedures of composite structure under earthquake load are made, as well as the destruction of composite structure. According to calculation and analysis, it can be known that this kind of composite structure can obviously improve seismic resistant capability, and the level of destruction is relative smaller, which can meet the requirements for fortification against earthquake that is "keeping intact in minor earthquakes, repairable in medium earthquakes, standing upright in major earthquakes"
Discussion on the Design of Water Supply and Sewage Engineering for School Canteen
Authors: Huang Shi Yuan , Huang Qiang , He Shao Hua , Zhou Shuai
Published: May 2011

Based on the particularity of the water supply and sewerage design of dining hall’s construction and retrofit in the college, some problems in design, such as water-supply system, drainage system, hot water system, and reclaimed water system are discussed. Also some corresponding advices and solutions are put forward. Some explorations, especially in the canteen hot water supply and the thermal insulation are made. In this way, the designs can better meet the requirements of operation.
Experimental Investigation of Indoor Thermal Environment of Using Radiant Cooling
Authors: Chen Jian Bo , Xi Ling , Li Fen , Li He
Published: May 2011

Capillary radiation air-conditioning is a form of high thermal comfort of new air conditioning, System's cooling capacity, surface radiation temperature and temperature distribution in air-conditioned room are important parameters to the system’s design and operation, determination and analysis of these parameters in the actual operation of capillary tube radiant air conditioning system is designed to have a practical reference value. This article is under summer conditions and through the experimental research methods, measurement and analysis the vertical, the horizontal and the wall temperature distributions of the air-conditioning room under different capillary radiation conditions, which provide reference information for the capillary tube design of the radiation air conditioning system, the selection of the operation parameters, the control of the condensation etc.
Study on Safety Evaluation Method for Water Distribution Networks Based on LS-SVM
Authors: Wang Zhi Tao , Su Jing Yu , Wang Wei
Published: May 2011

To evaluate the security of urban water distribution network, one model based on LS-SVM was put forth. On the basis of summary and analysis of influential factors for urban water distribution network security, a set of indexes used in the evaluation model above was constructed. The nonlinear mapping between the water distribution networks security classification and its conditions were learned from the finite samples and a water distribution network example was simulated using this model. In addition, the BP ANN model was used to simulate the same example. Through the analysis of the result of the actual security level, the security level acquired by the LS-SVM model and BP ANN model, it may be found that the result acquired by the LS-SVM model has high accuracy, and may used in actual engineering.
Analysis on Energy Saving in Cross-Critical CO2 Cycle Refrigeration and Development Localization
Authors: Li Xian Bi , Han Ru Bing , Tang Zhong Hua
Published: May 2011

This paper mainly analyzes the high efficiency characteristic of cross-critical carbon dioxide cycle refrigeration, especially when this refrigeration system works as a heat pump. When this refrigeration system is used as heat recycle system with larger different temperature and high level temperature, the solely superiority and energy saving capability of this system will reveal. However, the development localization of cross-critical CO2 cycle refrigeration system also exists, which includes immature cross-critical CO2 flow and heat exchange theory, and seal problem of compressor, expansion ratio of expansion equipment.
Experimental Study on the Mechanical Properties of Reinforced Concrete Columns after Exposure to Fire
Authors: Xu Jia Feng , Liu Ming Zhe , Tang Yue Feng
Published: May 2011

This paper provided three test data pertaining to the mechanical properties of reinforced concrete columns after exposure to ISO834 standard fire and three comparative test data pertaining to the mechanical properties of reinforced concrete columns at room temperature, mainly concerning the influence of fire on failure mode, distortion performance and ultimate load bearing capacity of reinforced concrete columns under axial and eccentric compression. Test results show that the failure mode of reinforced concrete columns after exposure to fire is basically same with that at room temperature. With the same concrete strength and heating condition, the bearing capacity of specimens reduces as the eccentricity increases. Strain along the section height of eccentric columns after fire basically agree with the plane section supposition while the flexural rigidity and ultimate load bearing capacity decreases obviously. The residual load bearing capacity of reinforced concrete columns after exposure to fire is only about 25% to 37% of that at room temperature.
Finite Element Analysis on Behavior of the Joint with Steel Tube Confined Concrete (STCC) Column to Reinforced Concrete Beam
Authors: Wang Wen Da , Guo Zhi Feng , Shi Yan Li
Published: May 2011

The steel tube confined concrete (STCC) column exhibits excellent mechanical performance. A 3-D finite element model (FEM) using ABAQUS was established to simulate the performance of the composite joints with STCC column and RC beam. Accurate material model, rational element type, and solution method were discussed. Some STCC columns and composite joints with concrete-filled steel tubular (CFST) column and STCC column were modeled based on the model, respectively. The results from FEM are good agreement with the test results. The mechanism of the composite joint was investigated based on the FEM.
Utilization of Industrial Wastes for Soil Stabilizer Preparation and Technical-Economical-Environmental Analysis
Authors: Cheng Yin , Wang Dong , Zhang Jian Xin , Li Zhan Guo , Huang Xin
Published: May 2011

In this paper how to utilize industrial wastes in soil stabilizer preparation with high added value is discussed. Firstly the characteristics of stabilized soil structure formation process and its special demand of stabilizer components were explored. Based on this, the design thought for the soil stabilizer prepared with industrial wastes is proposed and the examples are presented. Then technical, economical and environmental comprehensive index is analysed. Only if stabilized soil structure formation process was understood deeply and industrial waste was chosen properly according to the special demand of stabilized soil structure to components, the change from waste to resource can be realized. And then the stabilizer can be prepared with excellent performance, cost, environment effect and comprehensive benefit.
Research on Method of Confirming Typical SWMM Water Quality Parameters
Authors: Li Hai Yan , Yue Li Tao
Published: May 2011

Taking a roof in Shanghai for example, through the comparison of the relationship of rainfall and SS load in a single rainfall runoff obtained by experiment and SWMM simulation, typical water SWMM model parameters (maximum buildup possible C1, buildup rate constant C2, washoff coefficient S1 and washoff exponent S2) could be obtained. With this method, other cities’ water quality parameters for SWMM simulation could be confirmed, so as to provide basis for simulating water quality by SWMM.
Assessment of Vibrations Generated by Structure Demolition Part I: Influences on Surrounding Environment
Authors: Chen Zhi Yi , Yu Hai Tao , Yuan Yong
Published: May 2011

A triangular transfer hall is planned be built to distribute passenger flow rationally and improve multi-line transfer capability in the city of Shanghai, China. A large-scale reinforced-concrete bracing system, which is established to ensure the stability of the foundation pit, will be demolished with the completion of foundation pit. The influences of construction vibration on the surrounding environment are concerned. An evaluation method, which is generally applied to the ground vibrations caused by operation of machines, road and railway traffic, and construction activities such as piling and blasting, is then extended to assess the ground vibrations generated by structure demolition. It is found that the ground vibrations generated by demolition construction will affect the environment and human activities if without any vibration control measures.
Ultrasonic Attenuation Changes with Damage Level in Various Sized Concrete Specimens
Authors: Wang Huai Liang
Published: May 2011

The attenuation of ultrasonic pulse velocity in various sized concrete specimens under uniaxial compression loading is tested. Tests were conducted on prisms of 25×25×50 cm fabricated with dam concrete(maximum aggregate of 80mm),and standard 15×15×30 cm prisms,10×10×20 cm prisms which were made with the wet-screened components of dam concrete. Ultrasonic attenuation has been shown to increase significantly as distributed damage in concrete increases. Large changes in attenuation with increasing damage levels were found for all specimens at all power levels. Results also show that the rule of ultrasonic propagation in concrete is apparently affected by the scale effect and the effect of wet screen sieve of aggregate. These conclusions proposed can be applied to determining the extent of damage of mass concrete due to the complex load and other environmental effects.
Non-Parametric Identification of Structural Nonlinearity with Limited Input and Output Measurements
Authors: Lei Ying , Wu Yan
Published: May 2011

In this paper, a technique is proposed for non-parametric identification of structural nonlinearity with limited input and output measurements. The identification algorithm is based on the classical Kalman estimator for the displacement and the velocity responses and the recursive least square estimation for the unmeasured excitation and the restoring force. Two different models are used to simulate nonlinear structures: One is a 4-storey shear-frame structure with excitation on the top floor and the nonlinearity occurs at the bottom floor. The other is also a 4-storey shear-frame structure with both excitation and the nonlinearity at the top floor. Two numerical examples are carried out for the two kinds of models. Bouc-Wen hysteretic models are used to simulate the nonlinear impact. The simulation results demonstrate the efficiency of the proposed technique with limited output measurements.
Case Studies of Seismic Vibration Control of Civil Structures Using Shape Memory Alloys
Authors: Qian Hui , Li Hong Nan , Cui Di , Chen Huai
Published: May 2011

Shape memory alloys (SMAs) are unique class materials that have the ability to undergo large deformations, while returning to their undeformed shape through either the applications of heat (SME) or removal of stress (SE). The unique properties lead to their wide applications in the biomedical, mechanical, aerospace, commercial industries, and recently in civil engineering. The paper presents two case studies of structural seismic vibration control using SMAs. The first one is a study of the SMA reinforced RC members. Two innovative applications in RC members, such as SMA-based Precast Concrete Frame Connection (SMA-PCFC), and SMA reinforced RC short column, were proposed. Moreover, the self-rehabilitation properties of SMAs-based Intelligent Reinforced Concrete Beams (SMA-IRCBs) were further experimentally investigated. The results show that SMAs can improve the mechanical properties of concrete members. SMA reinforced RC members have unique seismic performance compared to ordinarily steel reinforced concrete members. The second one is a study of the structural energy dissipation system using SMAs damping device. An innovative hybrid SMAs friction device (HSMAFD) which consists of pre-tensioned superelastic SMA wires and friction devices (FD) was presented. The results of cyclic tensile tests show that the HSMAFD exhibits stable large energy dissipation capacity and re-centering feature. The effectiveness of the HSMAFD in reducing horizontal response of structures subjected to strong seismic excitations was verified through shaking table tests carried out on a reduced-scale symmetric steel frame model with and without the HSMAFD.
An Analysis of the Structural Reliability for Earth-Dwelling Caves in Response Surface Method
Authors: Tong Li Ping , Chen Zhi Ye
Published: May 2011

Earth-dwelling caves are a Chinese treasured historical cultural heritage. Nowadays, they are still widely used in some regions. They are primary ecological buildings with low energy consumption and nearly zero CO2 discharge, which is in accordance with the belief of sustained development and the requirement of low-carbon housing. The construction of these caves are mostly based on the local craftsmen’s experiences and there are no calculation and drawing designing, but they have been lived in for a hundred or even several hundred years without collapse, which is worth exploring the structural secret within them. This paper has studied the reasonable and scientific values of the present existing earth-dwelling caves from the perspective of structural reliability. According to the material and structural characters of these caves, the paper used a response surface method to calculate the structural reliability. The result showed that the index of structural reliability for the earth-dwelling caves was higher than that for the same structures set by the present code. This explored the scientific secret of the existence of these caves and the research achievement will also provide an effective method for the analysis of the structural reliability of earth-dwelling caves.
Reliability Analysis of Foundation Bearing Capacity in Generalized Random Space Based on Hansen Formula
Authors: Cheng Ye , Zhou Cui Ying , Xie Jin Rong
Published: May 2011

By introducing generalized random space conception to deal with the relativity of shear strength variables of rock or soil, the calculation formulas of foundation bearing capacity reliability analysis in generalized random space were deduced and the program was worked out. The reliability of one project’s foundation bearing capacity was analyzed. The results proved that the relativity of random variables affects the reliability analysis result and must be considered.
The Research of the Deformation Monitoring System Based on GIS/GPS Integration
Authors: Xiao Hai Ping , Chen Lan Lan
Published: May 2011

The research of "3S" integration of the deformation monitoring system, is one of the important development trend of the deformation monitoring technology. This text analyzed the key technology of the application of GPS/GIS integration, realized the effective integration of the mass of datas of GPS and GIS technology, and to establish the GPS/GIS integration of deformation monitoring system provides important technical support.
Study on Modulus of Elasticity of Reinforced Clay
Authors: Chegenizadeh Amin , Nikraz Hamid
Published: May 2011

Reinforced soil has been among the most effective soil modification materials. Its use has been expanded rapidly into civil engineering, geotechnical engineering and pavement engineering. Reinforcing subgarde in pavement systems has always been an issue. This study focuses on effect of fibre inclusion on the modulus of elasticity of subgrade material. Plastic fibre was used for this investigation. Fibre contents and aspect ratio have been changed during these tests. The fibre percentage varied from 0 % (for unreinforced samples) to 6%. Clay was used as sub grade material. Unconfined compression tests were carried out to investigate behaviour of the composite under different condition. The fibre length and fibre content found to play important rule on the modulus of elasticity of fibre. Furthermore it was observed that ductility of sample increased by fibre inclusion.
An Improved Algorithm for the Dynamic Analysis of Structures
Authors: Gao Feng
Published: May 2011

Based on Newmark’s step-by-step implicit integration method, an improved algorithm for promoting computing efficiency is put forward in this paper. Implicit integration method and improved algorithm were applied respectively to analyze the dynamic responses of a tunnel due to train vibration. Results indicated that the improved algorithm enhanced remarkably the efficiency of computation.
Fundamental Solutions of a Normal Force in Semi-Infinite Coating Materials Part II: Solution of Force Acting in the Interior of Substrate and at Interface
Authors: Yang Zhen , Guo Shi Qun
Published: May 2011

In this work, the spatial theoretical solutions of concentrated normal forces acting in the substrate and at the interface of semi-infinite coating materials have been deduced based on the image point method. The explicit solution is given in the series of the displacement functions corresponding to each image point. It is found that all displacement functions can be deduced by the order of the image point. Numerical analysis has been carried out to verify the theoretical deductions. It is found that the accurate enough theoretical solution can be obtained by only taking the displacement functions corresponding to the first several image points into account. The fundamental solutions for a concentrated force acting at interface of two bonded semi-infinite bodies is also deduced, which is necessary in the analysis of coating materials by using these theoretical solution as the fundamental solution.
Key Construction Technology for Highway on Soft Foundation
Authors: Lin Yang , He Ya Bo
Published: May 2011

In recent years, a lot of research practices have been done on improving the quality of subgrade construction and solving the differential settlement of subgrade. Therefore, key construction technology for highway on soft foundation is very important. This paper analysis common engineering problems on soft foundation and the development status for soft soil treatment technology, then build up the technology trends on it.
Comparative Analysis between Dynamic Simulation and Practical Result of Demolition of Building Structures by Blasting
Authors: Gong Xiu Bin , Li Chuan Ming , Yang Jian Guo
Published: May 2011

Due to the complexity of blasting demolition of building structures, it is difficult to obtain an accurate enough approach for quantitative analysis that can be applied to the constructional engineering. In this paper, dynamic simulation of the demolition blasting process is conducted with the finite element software ANSYS/LS-DYNA. By comparing the dynamic simulation with the practical result, it is found that the calculated results are very close to the practical collapse process. It is further proved that dynamic simulation can be conducted for the quantitative analysis of the collapse process.
The 3D Coordinated Building Design Based on Building Information Modeling
Authors: Lv Xiao Biao , Zou Yi Quan , Huang Yan Yan , Xu Jun
Published: May 2011

As an emerging technological and procedural shift within the building design industry, Building Information Modeling (BIM) is a set of interacting processes and technologies to manage essential building design and project data in digital format throughout the design procedure. It is also a central data repository to store and recall different kinds of project information through creating a 3D model as well as providing intelligent data for this model. Besides, project documentation can be brought forward as a byproduct of the 3D model. This kind of BIM approach allows designers to finish their design work and have the documentation of a building simultaneously. As a result, this design approach can accelerate the design procedure of building project through less time and effort. This paper begins with an outlook on the mechanism that BIM approach how to increase the productivity rates and reduce the waste of resources in architecture industry. Then, it provides a project example on theuse of Autodesk Revit software system. At the end, a discussion on how BIM approach is applied to into the building design industry and on the potential benefits of BIM approach is put forward.
Regional Characteristics of Niche and Planning Principles in City Streets
Authors: Liu Qi Bo , Liu Can , Zhao Jing Yuan
Published: May 2011

This paper introduces niche concept and niche overlap theory into the field of urban planning, and believe that urban niche is the extension of species niche concept. Urban provides certain resource for human beings to live and take actives, which makes different dimensions of resource, time and space in different urban's development. Regional characteristics of citiy as the manifestation of a city, which reflect different "space" position of a city in urban niche, the spatial position is multidimensional and with multiple subsystems. Regional characteristics of city mainly come from non-overlapped area of multiple subsystems in urban complex niche, the higher the proportion of non-overlapping, the more obvious features of urban regional characteristics. Therefore, this paper established a regional characteristic model of niche in city streets which based on complex ecosystem, and proposed planning principles under it, in order to emphasize regionality and create a positive ecological street.
Create the Pleasant Urban Public Space
Authors: Yan Fang , Liu Ji Peng , Wang Feng Yu
Published: May 2011

With continuous development of metropolitan, urban population has had a sharp rise in recent few decades, and the following appeared problem is gradual crowd in cities and potential sense of loneliness appearing in individuals in crowds. Urban public space design is very important because it is a main place for people to have social contacts and relaxations. Through analysis and observation of hundreds of urban public space, put forward the proposal to create successful great urban public space some advice.
Interpretation of Contemporary Landscape Architecture Design in System View of Nature
Authors: Cui Liu , Zhang Jin
Published: May 2011

Systematic is a global nature cognition theory which is defined as a basic model of things existence. Contemporary landscape architecture is now confronting a designery view transmission. System view of nature landscape asks for a dynamic way to treat landscape site by organizing the natural elements. Therefore landscape design is no longer the one of scenery prospect, but a benign “intervention” during site natural developing process and it is a dynamic process. This article aims to explain how the view of nature influences the landscape architecture and what the landscape design do with the systematic natural cognition.
The Bending of Set Square under Uniform Loads
Authors: Chen Ying Jie , Fu Bao Lian , Li Gang , Zhang Zhen Xian , Wang Lu Liang , Wu Jie
Published: May 2011

The triangular plate has widely application in the manipulation of the pr angular plate will often have error. In the former solutions, it is very hard to find one kind of simple and common way to solve the equation of deflection curve of the triangular plate. Under uniform load function, this paper uses the reciprocal theorem method to discuss the bending question of triangular plate with the unfixed hypotenuse and fixed side as well as the other side with simple supported, and the unfixed hypotenuse as well as two fixed sides. Thus the method has overcome complicated calculating process appeared in the classical theory, solved the limitations with difficulties to certain questions and established new way to solved the bending question of triangular plate. In the process of calculating, it will take specific proportion, applying the mixed variables method, carrying the calculation on the Matlab platform, and comparing it with the ANSYS finite element analysis result, to prove the result is correct. Thus the paper gives the equation of deflection curve and the graphs which can be employed in the actual project application. Therefore, the paper has certain theoretical value and project significance.
Ecological Design of Ternary of Artificial Landscaping Lake
Authors: Wen Ke Jun , Wu Li Ping , Yan Qian Qian , Liu Jia , He Qin , Li Si Qiong
Published: May 2011

Taking the ecological design of Mingfei Lake in our school as an example, the paper puts forward a general thinking of planning and Construction of water ecosystem, which is “pollutant reduction- environment control-transport pollutant intercepting-sustainable development”, and basing on the ternary theory of the landscape planning and design. By starting from the structural design of ecological non-biological components, structure configuration of aquatic plants and animals and construction of lakeshore functional facilities, it can be realistic to maintain the ecological functions sustainability of “water security, water environment, water landscape, water culture and water economy”.
The Accurate Calculative Methods of Cadre Design of Reinforced Concrete
Authors: Qin Zhi Hai , Qin Peng
Published: May 2011

"cadre design of the foundation ",which is up to the national standard of the People's Republic of China , gives the principle of cadre design of reinforced concrete. With the principle of the standardized structure design given in the literature, the specific calculative formula is deduced. During the formula deduction process, there exits some obvious conceptual errors, which lead to problems in the calculation formula of the design of foundation structure. Analysis the problems in design of reinforced concrete of below-wall strip foundation and under-columniation independent foundation, point out the cause of the problems and detrude the accurate calculative methods of these cadre design. Via the calculative examples, compare the difference of calculative results and the results of original method, prove that the accurate calculative methods are consist with the theory analysis.
Study on the Large Fire Tests Temperature Spread Properties of External Thermal Insulation System
Authors: Niu Zhi Rong , Huang Zhen Li
Published: May 2011

The current domestic exterior insulation system fire incidents are frequent. The study of exterior insulation system fire performance gets more and more relevant national authorities and insiders' attention. Based on two sides wall exterior insulation system as the research object, fire prevention experimental research method of insulation system and the insulation system temperature spread rule are expounded. Reveals the insulation system burning speed and scope of the fire from spreading under the action of the fire. The temperature and temperature field change regularity and insulation system of damaged situation after combustion are compared, and structural measures to improve the insulation system fire performance role is drawn.
Study on Sintered Wall Materials Made Use of Iron Tailings and Waste Rock
Authors: Jian Shou Wei , Yuan Long , Lv Yang , Tan Hong Bo , Li Xiang Guo , Ma Bao Guo
Published: May 2011

Iron ore tailings and waste rock are solid waste during mining in the steel industry. This paper presents the study on sintered wall materials made use of iron tailings and waste rock. The process parameters through chemical analysis and thermal analysis to determine the feasibility of using iron ore tailings and rock on sintered wall material. Plasticity index, firing shrinkage, water absorption, apparent porosity and bulk density are tested, and the proportion of these two materials are also determined. The results show that iron tailings and waste rock can be used to sinter MU15 wall materials, with the sintering temperature ranges 850-950°C, but shrinkage of the specimen (diameter and height shrinkage) of 2.5%-5.0%, and the apparent porosity 42% or more. This technology not only use both waste as raw material, furthermore, because of the higher iron content in iron ore tailings and waste rock, the products reduce the sintering temperature, decreased energy consumption. The technology uses waste as raw material, furthermore, due to the high iron content in the ore tailings and waste rock, the sintering temperature is decreased, which saves energy.
Low-Cycle Reversed Loading Behavior Nonlinear Analysis on Out Stiffener Ring Joint of Concrete Filled Steel Tubular
Authors: Li Cheng Yu , Luo Lie , Guo Yao Jie
Published: May 2011

The result of low cycle reversed loading indicates that，hysteresis loops of out stiffener ring joint performs good plumpness and stability, meanwhile, bulge is observed in the joint region. In order to explain this phenomenon, nonlinear simulation analysis is applied on stiffener ring joint under low cycle reversed loading. The analysis includes hysteretic energy dissipation index of joint, deformation and plasticity development at connection area. The analysis observes that:(1) hysteresis loops of the joint is stable, with the dissipation coefficients all above 2.0,which is in accordance with the criterion of good plasticity; (2) the size of web welding line openings is too large so that hysteresis loops of the connection do not coincide, thus the size of the openings must be controlled in a certain range; (3)obvious deformation is observed in the column wall of the connection region with a similar pattern as the hysteresis loops, which manifests the principle that the hysteresis loop is mainly contributed by the column wall deformation rather than beam end plastic deformation; (4)in the initial stage of low cycle reversed loading, plastic zonal area runs through the annular plate and the plasticity occurs in the beam after a fairly long period. Under reversed loading, as significant deformation occurs in the connection area and plastic zonal area runs through the ring plate, it is concluded that stiffener ring joint does not comply with the principle of “strong joint”.
Study on Effect of Silo Wall Elasticity on Lateral Pressure Ratio
Authors: Chen Chang Bing
Published: May 2011

Lateral pressure is a key parameter to silos’ design. It has an important effect on the safety and efficiency of silos. The lateral pressure ratios that recommended by some overseas design codes and literatures have been analyzed. These ratios didn’t take into account the elasticity of silo wall, one of which is 28% smaller than the measure value, but another goes up to super pressure ratio. A new lateral pressure ratio is derived by considering the elasticity of silo wall, which is relevant to Passion ratio of stored material and relative stiffness coefficient . The coefficient of usual metal silo varies from 0.01 to 0.2, so it has significance to consider the wall elasticity.
Night Ventilation Research of Office Buildings Part 2: Cooling Potential of Continental Climate Zone in China
Authors: Zhu Xin Rong , Yang Liu , Liu Jia Ping
Published: May 2011

Night ventilation is one kind of passive cooling ways which is very effective in certain climate type. The main work of this paper is to determine the cooling potential of office buildings that use night ventilation in the city of Xi'an. Xi'an is located in the Continental Climate zone of China. For this purpose, a typical office building simulation model has been built for the numerical analysis. Cooling and energy-saving potential of night ventilation in office buildings is determined through the simulation in different ventilation and air-conditioning cases by the energy simulation software DeST.
Assessment of Diaphragm Wall's Structural Impact on Groundwater Hydrology
Authors: Chang Te Hsing
Published: May 2011

The Southern Taiwan Science Park (STSP) is located between Hsinshi Township and Shanhua Township of Tainan County, with the newly-built, high-speed railway running through its eastern side. The low-frequency vibration which was generated by passing high-speed trains causes environmental disturbances to industries within the Park. To address this issue, the implementation of vibration-reduction project with detailed design and construction was provided. The diaphragm wall-type vibration reduction walls will be built along the borderline between Hsinshi Township and Shanhua Township to reduce the impact on industries. The diaphragm wall structure will block groundwater from flowing to affect the underground hydrology. This study was aimed to discuss and assess the best configuration for the vibration reduction effects and environmental impacts. Numerical analysis of the impacts on groundwater hydrology was conducted in two cases. The simulation results indicated that both sides of diaphragm walls developed gaps in groundwater levels. Hence, diaphragm walls effectively reduced adverse impacts on groundwater hydrology with openings at locations where underground pipelines ran. Such variations were within the scope of groundwater level of high water and low water periods. Therefore, surface runoff and land subsidence resulting from the diaphragm wall construction were not severe. As diaphragm walls were made of impermeable materials, pumping water nearby made the groundwater level drawdown effects worse. Groundwater level variations resulting from pumping water were far greater than the regional groundwater level variations after the establishment of diaphragm walls. Special attention must be paid to this situation in follow-up management.
Numerical Simulation on the Compound Crack Propagation Process in Concrete
Authors: Xia Pei Xiu , Zou Guang Ping , Tang Li Qiang
Published: May 2011

In this paper, numerical simulation on the failure process of the mixed mode crack about the concrete is carried out. The results show that the crack initiation angle and the peak load increase as the distance between the preexisting crack and the midline of the beam is greater, the distance is constant, the longer the length of the preexisting crack is, the bigger the peak load is. Due to the heterogeneity of concrete materials, the crack propagation path is tortuous, and tensile stress is the major driving force.
Study on Application of Mortar Splint in the Reinforced Masonry Structure
Authors: Liao Zheng Jun , Chen Chao He
Published: May 2011

The paper probes into the application of masonry strengthening with mortar splint in the reinforced masonry structure. By optimizing the reinforcement scheme, computing and comparing the indexes of the compound seismic capacity of the building before and after it is strengthened, it can be concluded that the method of masonry strengthening with mortar splint can greatly improve the compound seismic capacity of buildings and achieve the goal of building’s strengthening.
Structural Damage Detection Using Curvature Mode Difference Curve
Authors: Jing Hang , Jia Ling Ling , Zhao Yi
Published: May 2011

Damage detection in civil engineering structures using the dynamic system parameters has become an important area of research. The sensitivity of damage indicator is of great value to structural damage identification. The curvature mode is an excellent parameter in damage detection of structures, while in case that certain curvature mode curve can’t show existence of damage. In this paper, numerical studies are conducted to demonstrate the deficiency of curvature mode to damage detection. Then a new damage indicator called “curvature mode changing rate” (CMCR) is introduced which is processed by numerical differentiation of curvature mode curve. The simulation results show that the new index is superior to curvature mode for structural damage identification, and it is still sensitive to the damaged location in the mode node.
Laboratory Triaxial Test Study on Soil Reinforced with Roots of Manilagrass
Authors: Liu Kai Fu , Yang Xiang Ru , Xie Xin Yu , Wu Chang Fu , Liu Yong Hai
Published: May 2011

Laboratory triaxial tests of the soil reinforced with roots of Manilagrass were carried out in order to understand the stress-strain relationship. The change of shear strength indexes of the soil reinforced with roots of Manilagrass was investigated with the quantity of grassroots planted in the soil specimens. The results of laboratory triaxial tests show that the strength and capacity for resisting the deformation of soil reinforced with roots are better than those of unreinforced soil. And under the certain number of grassroots layers, the strength and capacity for resisting the deformation of soil reinforced with roots increase firstly and then reduce with the increasing of Manilagrass roots quantity. In other words, there is an optimal quantity of Manilagrass roots affecting the strength and capacity for resisting the deformation of soil reinforced with roots. The research results are important for understanding the mechanism and use of vegetation protection for slope.
Deformation Mechanism of Plate Anchor in Sand
Authors: Zhang Xin , Yue Jin Chao
Published: May 2011

Plate anchor is one of the most popular types of anchors widely used in geotechnical engineering. Reliable prediction of the ultimate uplift resistance of plate anchors requires its failure modes well understood. In this paper, an image-based deformation technique, the digital image cross-correlation (DIC), is used to measure the sand deformations around a scaled semi-circular anchor during uplifting. A series of tests have been conducted to investigate the failure modes of plate anchors in both loose and dense sand. Two distinctively different failure modes are measured by using DIC in both loose and dense sand respectively. This model study improves the understanding of the failure and development of loading capacity of uplift anchor in cohesionless soil.
The Optimization Design and Parametric Analysis of Photonic Crystal Fiber in Transverse-Stress Sensing System
Authors: Cao Qian , Liu Lei
Published: May 2011

Photonic crystal fiber has a good application prospect in civil engineering testing field. This thesis establishes the finite element module of photonic crystal fiber bearing transverse stress. The finite element analysis software ANSYS is used to analyze and optimize the cross-sectional model of PCF bearing transverse stress. The analysis gets the optimization section of photonic crystal fiber and the scopes of optimization parameters(L, d, f) finally.
Analysis on Infulence of Pile Spacing Acting on Bearing Capacity of Pile and Soil under Pile Cap Together
Authors: Yang Gui Hua , Li Huai Qi
Published: May 2011

In this paper, the caculating model of pile foundation accounting for bearing capacity of soil under pile cap is established. The influnces of pile spacing on load-sharing ratio, settlement and pile top force has been analyed. The result shows that load-share ratio of soil under pile cap and the settlement of pile foundation increase with the pile spacing; and the force of each pile tends to uniform with the pile spacing increasing gradually.
Application of Composite Foundation in Reinforcement Treatment for a Highway Existing Culvert
Authors: Deng Jian Hong , Wu Jian Qi , Li Wen Biao , Jiang Da Hua
Published: May 2011

The foundation reinforcement method was discussed based on an actual engineering example. The paper analyzes the cause of the fissures happened on a highway existing culvert. The combined reinforcement method with root piles composite foundation and static pressure grouting was adopted for the area that settles obviously. The method of design and construction about the composite foundation was introduced .The practice has proved that good reinforcement effect can be obtained when applying appropriate composite foundation for foundation treatment．
Flexural Behavior of Reinforced Concrete Beams Strengthened with Steel Wire Mesh and Polymer Mortar
Authors: Pan Yuan
Published: May 2011

The application of steel wire mesh and polymer mortar composites to the surface of reinforced concrete (RC) members as external reinforcement is a promising and recent new technique for strengthening and rehabilitating damaged concrete elements. This new technique has many advantages of resistance to fire, corrosion, ageing, and rapid construction speed. Test results indicated that the overall flexural behaviour of strengthened beam can be divided into three stages: precracking stage, cracking stage, and failure stage. Furthermore, a moment deflection model is developed based on the assumption of plane sections remains plane under load. The flexural behaviour of the strengthened specimens subjected to a four-point bending test was addressed by using transformed section approach. The suggested model was verified using the test data of 6 strengthened beams, and good agreement between experiment and prediction values is achieved.