bluuebunny/crossref_metadata_2025 huggingface dataset:
Minimum Thickness of Welding Patches to Recover Structural Performance of Steel Pipe Piles under Compression
Authors: Chen Xiao , Itoh Yoshito
Published: October 2011

This paper presents an analytical study on a minimum patch thickness necessary to fully recover structural performance of corrosion-damaged pipe piles under axial compressive loads using welding repair. Load transfer mechanism, the repaired stiffness and strength of pipe piles are examined. An accurate calculation of load share ratio of patch plates considering weld stiffness is derived, and the results are compared with experimental results and finite element analysis results. The minimum thickness of patch plates to fully recover the stiffness and the design strength of the corrosion-damaged piles to their intact state considering the existing loads is proposed.
Tentative Proposal on System Construction of the Urban Cultural Heritage in Xi'an
Authors: Wang Xin Wen , Liu Ke Cheng , You Tao
Published: October 2011

Cultural heritage serves as memory of history, authentic historical memory is certainly integral. The system of urban cultural heritage is a sequential combination of urban cultural heritages, and this is a new idea of heritage selection. this paper is to discuss the method of system construction of urban cultural heritage in Xi'an.
Reconstruct of Our Urban Community Planning System and New Study on the Realization Approach under the Low Carbon Vision
Authors: Yu Kan Hua , Cai Hui , Zhang Pei
Published: October 2011

This paper based on the low carbon requirement of urban community planning to address the theory research and practice of low carbon urban community planning. And then make thorough analysis on the development trend and present status for domestic urban community planning. Then put forward related counter measures and suggestion for reconstruct of low carbon urban community planning system and feasible approaches, hope it could be provide some significance to the scientific decision making in the sustainable development of urban.
To Be or Not to Be — Reflection on the Full Coverage of the Regulatory Detailed Planning
Authors: Zheng Xiao Wei , Huang Ming Hua , Wang Yang , Cao Hui Quan
Published: October 2011

On the basis of analyzing the pros and cons of the current practice of full coverage of regulatory detailed planning, the paper aims to establish a dynamic regulatory detailed planning featuring a comprehensive regulation both macroscopically and microscopically. The paper holds the belief that the coverage scope of the regulatory detailed planning should be the short-term construction area; in case that the practice of “Full Coverage” needs to be conducted, it shall be compiled on the basis of time sequence by separating the short-term and long-term project. The compilation for short-term project should start from the region and go deeper into the block and land parcel, and the development intensity index should be worked out according to the stage of land leasing in specific project; the compilation for long-term project should focus on the region and block area, and the development intensity index should be formulated in line with the city’s specific development stage and then make adjustment accordingly.
Nonlinear Earthquake Response Analysis of a New RC Frame Multi-Ribbed Composite Walls Structure
Authors: Tian Jie , Yan Zhi Chao , Cao Yang Yang
Published: October 2011

A new RC frame multi-ribbed composite walls structure is provided by using low yield strength steel. Two calculating structures are analyzed which one is the RC frame shear wall structure used as a comparison, and the other is the RC frame multi-ribbed composite walls structure. The nonlinear earthquake responses of the structures are calculated by using program IDARC2D.The nonlinear dynamic analysis models of the structures are established with retrogressive three-linear resilience model for beam, column and RC shear wall elements, while a smooth hysteretic model is proposed for representing low yield strength steel panels. The nonlinear dynamic time-history analysis of the structures under horizontal earthquake waves has been carried out. The earthquake responses of the structures and energy dissipation are studied, which provide more data information for the comprehension of earthquake responses and seismic performance of the RC frame multi-ribbed composite walls structure. The calculating results show that the low yield strength steel panels have obvious seismic mitigation effects, and that RC frame multi-ribbed composite walls structure has good seismic capacity.
Influence of Visiting Japan in 1903 on Jian Zhang's Urban Planning Thoughts
Authors: Yu Hai Yi
Published: October 2011

Nantong made great progress in city construction during 1895-1926 by the leading of Jian Zhang, upon which Zhang's Urban Planning Thoughts was emerging.Zhang went to Japan for a 70 days' visiting on education, business, political system, and local city construction, thereby obtained much illuminations from it. The research was applied during 2006-2008 by re-visiting the cities, places of Japan that Zhang went to in 1903, and collecting literatures in libraries, museums, historical archives of those cities. This paper considered that the effect on Nantong city construction was distributing in education, industry, agriculture, housing, business, traffic, landscape, and philanthropy. The influence of Zhang's Urban Planning Thoughts was mainly in local self-government, system planning, infrastructure planning, education system planning, and planning methods, etc.
Traditional Living Space of Organic Update along the River of Xiangtan City
Authors: Zou Ning
Published: October 2011

Based on the historical evolution of traditional Xiangtan City, elements, morphology of living space, that update the traditional urban living space, and propose for the city of Xiangtan traditional organic living space along the updated policy.
Research on the Development of Sichuan Traditional Rural Fair’s Landscape under the Guidance of Tourism Development
Authors: Jia Yuan Yuan
Published: October 2011

The tourism resource of Sichuan traditional rural fair doesn’t only inherit the thousands years’ classical custom of Bashu, but also integrate the construction styles of Northern part and Southern part of China. In the continuous development, the traditional rural fair has absorbed the different cultures of multi-nation and different places in it. However, under the grand situation of the rapid development of our country, the old town, which was formed long ago, has encountered the problems of regional decline, slow development, incomplete function and over-exploitation. The ancient buildings have been on the verge of disappearance. What’s more, the deteriorated ecological environment, the worsened living environment, the incomplete public service infrastructures, the contradictions of the road against the modern transportation means and the other problems have tortured the old town seriously. From the fundamental meaning of old town’s development, the upgrade, reconstruction and final rejuvenation have become necessary.
The Theoretical Study of Urban-Rural Integration of Nowaday China
Authors: Wu Xiao , Zhang Pei
Published: October 2011

Urban-rural integration is not only the focus of chinese social and economic development currently, but also hot in academic research. It is under such background; this paper examined and summarized urban-rural integration bottom-up in the view of systematic and multidisciplinary, and summarized the relevant research in and abroad.
A Game Research on the Integration between Xi’an and Xian Yang
Authors: Zhu Jing , Zhang Pei , Sun Hai Jun
Published: October 2011

The prisoner’s dilemma is applied to make the new game model between Xi’an and Xian Yang from Game Theory angle of view. In this new model, the profits inequality is taken into account when both sides face the same strategic option, which can make the model to approach more actual situations. The prisoner’s dilemma is the main handicap. Furthermore, the author built the interpretation framework of the two cities’ integration on the basis of the Game Theory and the inspirations of the European Union benefits gained by its members.
Study on Transformation Path and Planning Countermeasure of Resource-Based City Guided by New Development View
Authors: Sun Hai Jun , Zhang Pei , Zhu Jing
Published: October 2011

The scientific view of development with the emphasis on entirety, balance, coordination and innovation is our guideline for transform development of resource-based cites. But it is an important and frontier issue to carry out the mode of scientific outlook of development, as to achieve total transformation including ecology, economy, society. Based on new background of the times, the author systematically summarizes main problems of resource-based cities, then brings up the main transformation paths and many countermeasures accordingly under the background of urban-rural planning, as to come up with references and suggestions.
Effect of Geometry on Stress Distribution of Spew Fillet of Co-Cured Composite Single Lap Joint
Authors: Zhao Guo Hua , Shu Qing Lian , Huang Bo Sheng
Published: October 2011

Spew fillet is common in co-cured composite single lap joint. It plays an important role in the safety of the joint. In this paper, three spew fillets with typical geometries under static tensile load were investigated numerically using the commercial finite element code ANSYS. The computation results indicated: the fillet with a long curve edge had better performance than other fillets.
Study on Applying Ideas of Urban Management in Urban Design
Authors: Hao Li Jun , Xiao Zhe Tao
Published: October 2011

The aim of this paper is that study significance and effect of applying ideas of urban management in urban design. Through induction and analysis the conceptions about urban design and urban management, the paper evaluates the design case of Dayan Pagoda North Plaza, and elaborates the influence of urban management in urban design. Finally there is a conclusion that applying ideas of urban management in modern urban design will create a humanism city of optimization about economic efficiency, social efficiency, and ecology efficiency.
Urban Ecological Planning Opposite Problem Innovation Research Based on the Transforming Bridge Strategy
Authors: Sun Ming , Dong Jun
Published: October 2011

In urban ecological planning, there are plenty of the contradictory problems about plan goal and antithetic goals. It is an important and fussy work to solve these problems. This paper tries to untie these problems by using transforming bridge strategy of Extenics. Start with transforming part for separation and connection, analyze antithetic problem, establish problem model, analyze and transform goal etc. tackle antithetic contradiction, realize the sustainable development of ecology, economy and society.
The Theoretical Value and Realistic Significance of Government Governmental Responsibility Research in Urban Planning Management
Authors: Zhou Ja Feng
Published: October 2011

Urban planning management can not be implemented without government’s control and coordination. It is governmental responsibility to achieve the harmonious development of the city. Therefore, governmental responsibility we pointed is not only a promise, but also closely related to the confirmation of government function, the structure of government model and political process of the government. It has great theoretical value and realistic significance to do the research on governmental responsibility in Urban Planning Management.
Research on Korean Nationality’s Rural Landscape
Authors: Mo Wei , Wang Xiao Li
Published: October 2011

By analyzing the features in Korean nationality’s rural landscape, abundant precious fortune of cultural value can be explored. This paper, based on the combination of the peculiar layout characteristics of rural Korea and the theory of rural landscape, intends to probe into the future rural landscape in Korean area with the research emphasis on the development of traditional rural Korea in aspects of geographical shape, national culture, spatial arrangement, etc.
Static and Fatigue Experimental Research on Reinforced Concrete Beams Strengthened with Pre-Stress CFRP Rods
Authors: Xu Li Hua , Zeng Hao , Xu Feng , Qin Wen Ke
Published: October 2011

In this paper, a total of six reinforced concrete beams including four beams strengthened with externally prestressed CFRP rods and two unstrengthened beams have been tested under monotonic and cylic loads in order to investigate the influence of a novel technique on the flexural static and fatigue behavior of the specimens. The experimental results show that the static and fatigue performance of strengthened members have been improved in terms of that the flexural capacity is greatly enhanced, the fatigue life is increased and the stress range of the internally tensile reinforcing bars is decreased as compared with the unstrengthened ones. It indicates that the developed technique can enhance the flexural capacity as well as improve the fatigue performance of RC members.
Dynamic Response Analysis of Composition Foundation with CFG Piles
Authors: Liu Zhong , Zhu Jun Gao , Zhang Zong Liang , Zhu Guo Jin , Sun Ying Tao
Published: October 2011

The dynamic time-history response analysis method was employed to analyze the dynamic response of composition foundation with CFG piles. The deformation and stress distribution of composite foundation of CFG piles with different length and amount of piles under seismic wave was investigated. The results reveal that the bearing and asti-deformation capacity could be improved effectively for composite foundation under earthquake loads by increasing the length and number of pile. The vertical stress of foundation soil decreases gradually with the increase of the length and number of pile. The practice shows that CFG piles provide a positive contribution to the aseismic effect of foundation soils mass. The present research can provide some references to similar projects.
Empirical Analysis on Sustainable Development of Xi'an
Authors: Wang Xu Guang , Zhou Tao , Gao Shu Hua
Published: October 2011

The sustainable development of Xi’an was analyzed based on statistical data from 1996—2008 using economic theory to find the principle factors influencing the development of Xi’an and to identify the formula of contribution rate to the growth of Xi’an by each factors. The regression analysis is used to obtain the value of contribute rate. The result show that the largest contribution is from accumulation of physical capital, and the contribution from technological advances is increasing year by year. The labor factor and human capital investment make little contribution to Xi’an growth. Capital allocation and scale economic do negative effect to economic growth.
Experiment on the Hysteretic Behaviors of Light-Weight Steel Portal Frame with Tapered Members
Authors: Li Qi Cai , Wang Zhen Shan , Su Ming Zhou , Shao Xue Chao , Shen Lin
Published: October 2011

In order to study the seismic behavior of steel portal frame structures, Cyclic loading test on a 1:3-scaled model of single-story single-bay steel portal frame with tapered members has been carried out. Based on test results, hysteretic curve, skeleton curve, stiffness degradation and transverse displacement of the structure are obtained. Meanwhile, the seismic performances of the structure are analyzed from aspects of ductility, energy consumption, stiffness degradation, bearing capacity, etc. It is concluded that ductility and energy consumption capacity of this structure are poor; because of its light weight, the structure attracts little seismic load; when portal frame structure designed according to current Chinese design codes suffers from small seismic action, it has enough seismic bearing capacity.
Observation and Evaluation of Subgrade’s Settlement
Authors: Pan Feng Wen
Published: October 2011

Due to the diversification of soft soil’s treatment methods in coastal region, the evaluation of the treatment‘s effect on freeway is the main basis of the acceptance check. According to some highway’s soft soil foundation’s treatment combined with data of ground settlement during construction, make science evaluation of the treatment effect on soft soil foundation.
Fracture Behavior Analyses Compared Dog-Bone Connection with Traditional Connection
Authors: Sun Yu Ping , Hou Zhen Shan
Published: October 2011

Through the ABAQUS three dimensional modeling, established the dog-bone connection and traditional connection’s 3D finite element model, obtained the beam to column’s hysteretic curve, crack tip’s stress intensity factor as well as energy release rate at the weld of beam-column connection, the middle of reduced beam section and the same place in traditional connection. The theoretical analysis indicated, reduced beam connection’s hysteretic curve is more plumpness in shapes, have no significant pinch phenomenon, spindle shape, so the energy dissipation is better. From the view of fracture toughness, the weld joint’s fracture toughness is basically the same between dog-bone connection and traditional connection, the curves of weld crack tip’s biggest stress intensity factor as well as energy release rate about the two types connection are separately overlap, but at the middle of reduced beam section compared with the same place at the traditional connection, crack tip’s biggest stress intensity factor as well as energy release rate are significantly increased, when the initial crack length 3mm is assumed at the middle reduced beam section and the same place at the traditional connection, the reduced beam section connection’s nominal stress when reaching the material toughness KIC, it is 17% lower than traditional connection, in stress developing process, the middle of reduced beam section’s stress is biggest and it can reach material toughness. So the reduced beam connection can play a role as fuse, realize strong joints weak pole design concept.
Investigation of Dilapidated Houses and Analysis of Typhoon Disaster in Wenzhou District
Authors: Shi Wen Hai , Sun Zan
Published: October 2011

Based on the investigation of dilapidated houses in Wenzhou district, this paper descript the house characteristics such as construction sites, shape features, structure style, construction age and present conditions, and analyzed the reasons of houses become dilapidated. Combined with the typhoon and house disaster records, this paper also summarized the features of typhoon disaster and the wind-induced damage mechanism of rural residence.
Subway Monitoring System Based on TM30 Georobot Research and Implementation
Authors: Liu Xing , Wei Shi Yu , Gao Qiang , Qing Zhou , Ran Chun Lin
Published: October 2011

This article describes the basic principles of TM30 Georobot and GeoCOM port, completed the structural design of subway monitoring system database; Based on development environment with Visual Basic 6.0, Monitoring data to achieve automated collection of subway, as well as real-time analysis of monitoring data, Among them, the data were analyzed using different wavelet analysis model. Finally the automatic system is provided with monitoring data acquisition, real-time analysis and pre-alarm function, and provides report output.
Analysis of Dynamic Displacement Response of Bridge with Impact of Standard Energy
Authors: Zhang Xian Min , Xu Ke Shi
Published: October 2011

Conventional method is getting static displacement calculated by dynamic displacement and impact coefficient aim at making the detection of the bridge faster and more precise. But in fact, it is too difficult to ensure the dynamic displacement under the influence of roughness of the bridge deck. For the reasons given above, this paper simulates the bumping testing on the cross section of midspan by explicit dynamic FEM. A vehicle passes through the cross tie which is higher than the highest unevenness, and then gives an impact load to the cross section of the midspan for getting the maximum dynamic displacement of the cross section. This method can eliminate the influence of roughness of the bridge deck and it is a new pathway of bridge dynamic testing.
Evaluate Engineering Project Risk Based on Fuzzy Set
Authors: Zhang Wei , Sun Leng Fei
Published: October 2011

Engineering projects often face risks from technology, economy, nature, social and other aspects. Risk factors are of interdependence and interaction, so they are very difficult to be quantified. The paper describes a risk evaluation method for engineering projects based on fuzzy set theory which uses respective fuzzy numbers to evaluate the factors. The primary weights of factors and evaluation of alternatives are determined by applying fuzzy numbers. The results are consistent with the results calculated by conventional risk evaluation method. The research demonstrates that the method is objective and accurate, and is of an application value in the risk evaluation for engineering projects.
Leakage Detection and Safety Monitoring of Dam
Authors: Wang Jian Feng , Hu Chuan Long , Zhang Zai Xuan , Jin Shang Zhong
Published: October 2011

Distributed optical fiber temperature sensor (DTS) system is used in leakage detection and safety monitoring of dam by measuring temperature. Problems and solutions of using DTS system in dam are researched. Two typical engineering applications in the Three Gorges dam and Xin'anjiang hydropower station are studied. New methods are put forward and test results are listed in the end.
Sensitivity Analysis on Ultimate Load Bearing Capacity of a Single-Layer Three-Way Grid Cylindrical Shell to Failure of Member
Authors: Hou Yuan Heng , Wang Yi , Hao Xiao
Published: October 2011

Based on the calculation method by Frangopol on redundancy, the paper calculates the ultimate load-bearing capacities of a single-layer three-way grid cylindrical shell when it loses each lattice at first by a whole-process analysis program developed with double non-linear condition considered, then sensitivity analysis is done and sensitivity distribution diagram is set up. To reduce the probability of progressive collapse, it is necessary to strengthen member of low redundancy.
Analysis of Construction Risk Control Project for Shaft Close to Current Iron Tower
Authors: Bo Huai Shi , Liu Hua Kuan
Published: October 2011

Though engineering compares and numerical analysis, the analysis of construction risk control project for shaft close to current iron tower is carried on, which relies on the engineering of electric cable sending-out of 110kv transformer substation in XiGuan Intersections, the city of LanZhou (the section of underground excavation in the west of LeiTan river).The result shows that the method of isolated steel pipe and grouting technique applied for stratum consolidation can effectively control the iron tower’s deformation and decrease the construction risk.
Displacement Monitoring Method Based on Inclination Measurement
Authors: Gao Nai Hui , Zhao Ming , Li Su Zhen
Published: October 2011

Displacement is a very important parameter in the civil engineering safety evaluation. But traditional displacement measurement methods are impractical and inconvenient in application, for the reason of money cost, time invested or labour involve. Spline-method is proposed to describe the displacement curve based on the angle values measured by inclinometers. Cubic spline is chosen for figuring out the inclination function and displacement values all over the structural. Numerical experiments have proved that Spline-method is feasible and has very high precision.
Experimental Study on Bond Behavior between CFRP Sheet and Wood
Authors: Xie Qi Fang , Xue Jian Yang , Zhao Hong Tie , Hu Jun Fang
Published: October 2011

Fiber-reinforced polymer (FRP) has been applied to reinforce wood structure with its many advantages. But results of experimental study and engineering practice have showed that the failure is generally caused for lack of bong strength between FRP and wood, so the bond behavior between FRP and wood is very important. In this paper, based on the shear bond experiment between wood and CFRP sheet, the bond properties are researched such as failure character, characteristic of strain distribution, effective bond length and bond strength. Results showed that: at the loaded-end, the strain of the CFRP sheets is the maximum, and then strains decrease quickly with the increase in distance from the loaded-end. Strain distribution along cross direction is not uniform and the strains of the center location are bigger obviously than that of the edge location. The effective bond length between CFRP sheet and wood is more than 120mm.
Study on Cracking Reasons for Continuous Box Girder Bridge with Secondary Concreting
Authors: Lu Si Ping , Huang Fang Lin , Wu Yan Bin
Published: October 2011

This paper studied the main cracking reasons for small and medium-span continuous girder bridge with secondary concreting based on ANSYS. Some prevention measures to concrete crack caused by the inelastic subsidence were also proposed. In considering the global deformation of scaffold-beam, the inelastic deformation of scaffold, the hydration heat of cement, and the characteristics of early-age concrete, influence of inelastic subsidence of support foundation on concrete cracking were analyzed by time-varying transient analysis. It can be concluded that the value of inelastic deformation is the decisive factor for the concrete cracking. Field measurement results of several bridges validate the conclusion.
Lamb Waves Signal Analysis in Structural Health Monitoring Systems
Authors: Zhao Nai Zhi , Huang Chang Tie , Chen Xin
Published: October 2011

Many of the wave propagation based structural health monitoring techniques rely on some knowledge of the structure in a healthy state in order to identify damage. Baseline measurements are recorded when a structure is pristine and are stored for comparison to future data. A concern with the use of baseline subtraction methods is the ability to discern structural changes from the effects of varying environmental and operational conditions when analyzing the vibration response of a system. The use of a standard baseline subtraction technique may falsely indicate damage when environmental or operational variations are present between baseline measurements and new measurements. A procedure was outlined for the method, including excitation and recording of Lamb waves, and the use of damage detection algorithms. In this paper, several tests are performed and the results are used to help develop the damage detection algorithms previously described, and to evaluate the performance of the instantaneous baseline SHM technique. Analytical testing is first performed by feeding known input signals into each damage detection algorithm and analyzing the output data. The results of the analytical testing are used to help develop the damage detection algorithms.
Experimental Study on Frost Resistance Durability and Service Life Prediction of Normal Cement Concrete
Authors: Lin Shi Zhu , Li Hui Min , Zhang Hong Yan
Published: October 2011

The existing concrete structures, especially hydraulic dams, in the cold areas of northern China have suffered from freeze-thaw damages to varying degrees in the small part or the vast areas of the projects. This paper will work out the performance deterioration index with the relative dynamic elastic modulus and the mass loss rate of the concrete. The test shows that there is a linear relationship between the concrete's relative dynamic elastic modulus and the increasing number of freezing-thawing cycles; the mass loss rate, however, varies with the water-cement ratio and displays different tendency of changes in the initial phase of the cycle, but the mass is decreased in the later phase. Besides, combining with the application, the writer will simulate the concrete's freezing-thawing process under actual operation conditions with the standard test data, in order to offer the presumption model of freezing-thawing durability and predict the residual freezing-thawing life of the concrete, thus providing theoretical basis for the structure's maintenance, repair, and dismantlement.
Impact of Structural Course Thickness on Heavy Load Semi-Rigid Asphalt Pavement Service Life
Authors: Sun Ji Shu , Wang Xiao Hua , Xiao Tian , Jin Can Zhang
Published: October 2011

Calculation of structural course thickness is the primary task in pavement design. It will directly influence the mechanical properties, service life and the cost of pavement structure. Using BISAR3 of SHELL design method, the impacts of structural course thickness on the mechanical properties and service life of heavy load semi-rigid asphalt pavement structure were analyzed systematically. And the influencing laws of the thickness of surface course, base course and sub-base course on heavy load semi-rigid asphalt pavement service life were also discussed. According to the results of sensitivity analysis of structural course thickness and axle loads, a prediction model of service life of heavy load semi-rigid asphalt pavement was proposed. These achievements can contribute to determine the rational structural course thickness of semi-rigid asphalt pavement and ensure the service life of pavement consistent with the cost.
Experimental Research on Ultimate Bending Capacity of Reinforced Concrete Poles in Service Period
Authors: Xia Kai Quan , Wang Ni , Chen Zong Ping , Zhong Ming
Published: October 2011

In order to evaluate safety performance of reinforced concrete poles accurately, 6 reinforced concrete pole specimens were selected randomly for the bending test. The mechanical behavior and failure mechanism of all specimens were studied, failure modes were revealed, and important experiment data were also obtained, such as cracking loading, ultimate loading, crack development shape, crack width and so on. Based on the experiment data, moment-crack width relationship curve and moment-deflection relationship curve were obtained. Research results showed that failure modes of specimens were similar to “less-reinforced beams”, based on limit state design method in normal use, security surplus factor is 1.27 before collapse damage.
Study on the AE Characteristics and Wave Velocity of Concrete during the Total Failure Process
Authors: Zhao Xing Dong , Liu Jie , Cao Shan Chuan , Xu Shi Da
Published: October 2011

This paper introduces an example on AE monitoring and ultrasonic wave velocity measurement of concrete (C20). Experiment on AE characteristic of the full failure process of concrete is carried out on the pressing machine. AE sensors can be surface mounted. A system (the 8-channels, high-speed acquiring and analyzing AE signal), called HUS (Hyperion Ultrasonic System), was employed to acquire and record AE characteristics. AE signals were recorded during loading (fracture propagation) subject to the uniaxial compressive loading until failure. Using a simplex location algorithm allows AE event location from first arrival times to be determined by the AE sensors. The mechanical properties of concrete and acoustic emission characteristic, including the full stress-strain curves, AE counts, and AE rate and ultrasonic wave velocity, were obtained. The relations among AE counts, AE rate, stress levels, ultrasonic wave velocity and time are analyzed in detail. This paper reports AE observations made with an array of this new high-fidelity. Crack initiation and crack propagation due to the uniaxial compressive loading were monitored for AE activity and compared with visual observation. Meanwhile, stress changing influence the wave velocity of concrete; with the initial crack expands, up to the rock sample failure, the wave velocity falls gradually. Some insight into the percentage of AE events that must actually be detected to describe the health of concrete sample was gained.
Numerical Analysis of the Influence of Tunnel Construction on High-Voltage Transmission Tower
Authors: Zhang Hua Lin , Yang Jun Sheng , Yang Yuan Hong
Published: October 2011

Coal mining often results in settlement of tower foundation and stress change of tower. The influence of tunnel construction on above tower is similar to the influence of coal mining on above tower. Therefore, it is necessary to analyze the settlement of tower foundation and stress of tower. Some reinforcement measures have been taken to the foundation of tower before tunnel construction. The settlement of tower foundation and stress of tower is analyzed by ABAQUS finite element software. The analyses show that the settlement of tower foundation and stress of tower are within the range of the allowable, during tunnel construction. These show that the safety of the tower can be guaranteed after reinforcement.
Transportation Matching Design of Earth Pressure Balance Shield in Medium Distance Tunnel
Authors: Jia Yu , Yang Long Cai , Liu Jian Guo
Published: October 2011

Aiming at medium distance transportation of excavated spoil and constructional components in the tunnelling process, this paper combines with a water-conveyance tunnel engineering and analyzes the influence factors that affect the construction efficiency of earth pressure balance shield(EPB shield), and then works out an available scheme based on that the transport link should well match with shield tunnelling. The field condition indicates that the equipment lectotype, marshaling and transport organization in this scheme guarantee the transport capacity and continuity for tunnelling, which ensures construction progress. The idea in this design can provide similar engineering with reference.
Study on the Features of Community Supporting System for the Elderly at Home in Beijing-through a Comparison on Three Communities
Authors: Xu Fang
Published: October 2011

Through a comparison on the community support for the elderly at home(SSEH) carried out in three communities in Beijing in recent years this paper aims to analyze the conditions both of hardware and software in communities, then summarize the features of supporting system for the elderly at home. The research approaches consist of case study and Comparative method. The conclusions are as follows: 1) According to traditional and practical situation of each community the SSEH appears diversification in form and leading subjects, which could be divided into three main types: government-lead community-lead and market-lead; 2) Three type SSEHs develop different multi-actor and multi-level network regarding integration of various elderly-related resources within community respectively.
Research on Construction of Loess Cave
Authors: Zhang Yin , Zhang Peng , Gao Xin , Yang Shao Hua
Published: October 2011

In the passage, the process of selecting location, size, set out, dig kilns etc of the cliff-cave and sunken cave were discussed, as well as some of the requirements they should meet. The location selection is important. Then a number of structural, waterproofing and drainage measures were proposed. Finally, some construction points were mentioned, and thickness of overlying soil, span and height of the cave, kiln leg width, sidewall height etc should be checked after completion.
Computation of Jacked Pipe Pile Side Resistance Based on Time Effect
Authors: Wang Jia Tao
Published: October 2011

In the re-pressed tests of jacked pipe piles in soft clay, it was observed that the re-pressed starting pressure can reach to more than 2.5 times of the final pressure for 25 days after finishing the installation; and it increased more rapidly in early period than later. Through the study of the time effect mechanism, it is found that the increment of ultimate bearing capacity of the single pile is mainly caused by side soil resistance. The end resistance has little influence on the time effect of bearing capacity of pile. According to the simulation result of the test data, the relationship between pile side resistance and time can be described with logarithmic curve. By this new computing model, the side frictional resistance in different resting time can be obtained, and then the ultimate bearing capacity. It is proved that this method is feasible because the values of side soil resistance calculated by the computing model with software are well consistent with the field tests results.
Analysis of Single Pile Settlement in Layered Soils Based on Shear Displacement Method
Authors: Fu Gui Hai , Wei Li Min , Zhou Hui
Published: October 2011

Based on the theory of shear displacement method, the transfer matrix of pile in layered soils was deduced, so the analytical theory of settlement of single pile in layered soils is established, which can take into account the nonlinear influence of soils, and with which settlement, distribution of axial force, displacement and skin resistance of single pile along the depth in layered soils can be easily attained. By contrast with the practically measure data, it can be seen that the method proposed in this paper is simply and comparatively accurate in calculating the pile settlement under working load.
Numerical Analysis of Metro Station Construction by Large-Diameter Shield and Pile-Beam-Arch Method
Authors: Ding De Yun , Yang Xiu Ren , Lu Wei Dong , Liu Wei Ning , Yan Mei , Li Ai Min
Published: October 2011

In more and more complicated urban building environment, a new construction method that metro engineering is constructed by large-diameter shield and shallow mining method can be regarded as a great attempt in China. By taking the Gaojiayuan station of Beijing metro line 14 as an engineering background, the main construction steps for the platform of the metro station built by a large-size shield with an outer diameter of 10 m and the Pile-Beam-Arch (PBA) method are introduced. Based on the soil-structure interaction theory, a two-dimensional finite element model is used to simulate the shield tunneling and the platform construction by the PBA method to enlarge the shield tunnel. The ground deformation and structural stress of the platform are predicted. The numerical results can be regarded as a valuable reference for the application of the new construction method in Beijing metro line 14.
Effects of Initial Geometric Imperfection on Stability of Single-Layer Reticulated Shell
Authors: Zheng Fei Hua , Lei Jin Song , Yin Wen Zhi
Published: October 2011

The stability of reticulated shell is a key issue for single-layer reticulated shell. In the paper, a single-layer arch-supported shell structure was analyzed by finite element software MIDAS. The eigenvalue buckling analysis and the geometric nonlinear overall stability analysis with initial imperfection of the model which carried two different load combinations were studied too. At the same time, the influences on the stability of the shell structure were researched. The results showed that the shell structure was sensitive to the initial imperfection. Under different load combinations, the instability of modes and limited capacity of stability are different in the shell structure.
Research on the Dynamic Responses of Shallow-Buried Depth Tunnel under the Action of Rayleigh Waves
Authors: Xu Hua , Li Tian Bin , Yang Chang Wei
Published: October 2011

It has been proved by the seismologic observation of 5.12 Wenchuan Earthquake that a large number of shallow-buried depth mountain tunnels at the portal are underwent severe damage. Earthquake waves, especially Rayleigh waves may be a major factor causing the damage. The numerical model of the shallow-buried depth mountain tunnels by FLAC3D is establishes in this paper, and the dynamic responses of the shallow-buried depth mountain tunnels under the action of Rayleigh waves are simulated by loading on normal Rayleigh waves. The effect of different strength of surface waves is simulated by the in-site blasting tests. The dynamic responses of the tunnel lining under the action of Rayleigh waves are obtained by filtering and composition separation in order to discuss the incidence and mechanism of action. The results show that the dynamic responses of tunnel lining under the action of Rayleigh waves mainly focuses on the portal of tunnel, namely the buried depth and lengthways depth of the tunnel are 0~16m and 0~20m, the tunnel lining is damaged easily in the incidence, and the multiplicative effect of Rayleigh waves often occurs at the portal; beyond the incidence, Rayleigh waves attenuate rapidly and the dynamic responses of the tunnel lining decreases gradually, which has little effects on the safety of tunnel structures.
Shrinkage Induced Tension in Reinforced Concrete Struts for Retaining Large-Scale Excavation
Authors: Li Lin
Published: October 2011

Shrinkage induced tensile force was observed in a 264m long reinforced concrete struts through field monitoring during a foundation excavation in Shanghai, China. In the construction period, shrinkage occurring in latter cast concrete induces a tensile force to the former part of long Reinforced Concrete strut. Inclinometer installed in retaining wall also shows that the tensile force produced by shrinkage tends to pull the diaphragm wall, which makes an enlargement to the deflection under earth pressure. This paper describes the layout of retaining structure, ground conditions, excavation procedures, and monitoring installation. Monitoring data shows that concrete shrinkage in the super-long RC strut will produce tension to the supporting structure. The influence of concrete shrinkage and relative controlling strategy are suggested in the end.
Study of the Influence of Sediment Properties on Complex Impedance at the Head of Rock-Socketed Pile
Authors: Wang Kui Hua , Wu Wen Bing , Wu Deng Hui , Zhang Zhi Qing
Published: October 2011

Based on virtual soil pile model, the influence of sediment properties on complex impedance at the head of rock-socketed pile is theoretically investigated by virtue of Laplace transform technique and impedance function transfer method. Firstly, the sediment under pile toe is assumed to be virtual soil pile which the cross-section area is the same as the pile. The layered soils surrounding pile are described with plane strain model. Then, by means of initial conditions and boundary conditions of the soil-pile system, the complex impedance at rock-socketed pile head in frequency domain is derived at condition of arbitrary excitation on the pile head. At last, by using parametric study method, the influence of sediment properties on complex impedance at rock-socketed pile head is studied. It is shown that sediment properties have significant influence on complex impedance at the head of rock-socketed pile.
The Overall Design of Qingdao Jiaozhou Bay Subsea Tunnel
Authors: Song Chao Ye , Zhou Shu Ming
Published: October 2011

The Qingdao Jiaozhou Bay Subsea Tunnel is the main important straitcrossing road linking the main city and complement city. The tunnel is about 7.8km long with six two-way lanes, which about 3.95km in sea area. The maximum waterdepth of tunnel in Jiaozhou bay is 42m, and the deepest point of crown to the sea-level is 78m. The land section is dominated by grantie, and the sea section is composited of volcanics and sub volcanics , in which the minning method was used. Combining with the layout and technical standard of Qingdao Jiaozhou bay subsea tunnel, this paper gave the detailed introduction of tunnel construction condition, construction scale, technical standards, plane alignment, vertical section selection, and construction technology.
The Study of Architectural Theory of Promote Neighborhood Interaction
Authors: Wang Wei , Ma Jing
Published: October 2011

China's construction sector with foreign research results, the promotion of pro-urban settlements, and launched a multi neighborhood exploration. A lot of researches studied how to increase the neighbors’ intercourses in town residential quarters. For a long time, some representative theories were regarded as the criterions directing or evaluating the design of public space for residents’ intercourses in domestic urban residential quarters. Post occupancy evaluation was a significant part of the perfect design process. In this paper, surrounding the town neighbors’ intercourses, a lot of serious and systemic investigations were done in Kunming, and in addition some evaluations and self questionings were done on these theories.
A Study on the Construction Techniques of an Open Cut Tunnel Annexed to an Existing Electric Railway While Assuring Safe Traffic
Authors: Xie Xin Min
Published: October 2011

In order to resist the landslides at the Chongqing-Huaihua Railway, A new 82m long open cut tunnel is constructed under normal operation of the railway, in spite of the HV contact wire overhead and tracks below the line. The tracks are reinforced by suspending every other track panel, so that construction of the open cut tunnel foundation under the ballast bed can be executed without affecting safe operation of the railway; arch-shaped steel pipe supports are used to decrease the interchange of HV contact wire during the construction without affecting normal operation of the railway; arch lining trolley is created to lift, slide and be electricity-proof, so that the work above the contact wire would not contact with the wire, and construction of arch ring and changing formwork would not be obstructed by normal operation. These new and creative schemes and techniques may provide approaches to constructing open cut tunnels for electric railways.
Design and Application of Comprehensive Development Level of the Construction Industry Model Based on SPSS in Shandong, China
Authors: Song Xiu Hai , Gu Yu Ting , Sun Jing Jing , Wang Chao , Cao Xiao Jie
Published: October 2011

To evaluate the sustainable development level of construction in Shandong, China, the model was built by principal component analysis method. Meanwhile, Analytic Hierarchy Process (AHP) and basic rules of statistics were fully used to set up the index system. The data from 2007 to 2009 were processed by SPSS software, through calculation, the degree of sustainable development were shown intuitively.
Study on Project Management Maturity of Real Estate Enterprise
Authors: Wang Ya Ning
Published: October 2011

Based on the theory of enterprise project management maturity, this paper analyzes the influence factors of real estate enterprise project management maturity and put forward the evaluation index system considering the characteristics of real estate project management. AHP model for project management maturity of real estate enterprise is established, which gives the method and steps of project management maturity evaluation. The model provides a powerful tool of developing project management ability for real estate enterprise.
Research on Applying the Total Quality Management to Implicit Cost Control in Construction Projects
Authors: Shao Bin Lin , Wang Fan , Chen Zhuo
Published: October 2011

Construction industry is one of the pillar industries in national economy. In this field, how to control the implicit cost is a difficult problem to the cost control in construction projects. This text analyses the measures about implementing total quality management in construction projects, which aims to control the implicit cost in a more effective way and will increase the benefit and core competence of enterprises.
Force Characteristic Analysis of Overlying Stratum Based on Elastic Foundation Beam Theory
Authors: Wu Lei , Li Ming , He Min
Published: October 2011

Regard the mechanics model of key rock stratum in overlying strata as the single-span beam with semi-infinite length elastic foundation support. Based on elastic foundation beam theory, derive the analytic solution about inner force distribution of overlying strata. Then analyze the variation law of maximum value of bending moment and its location of overlying strata followed by beam space and relative rigidity. Through the research and analysis, the relationship between the elasticity of elastic foundation and the stress field of digging area is elaborated.