bluuebunny/crossref_metadata_2025 huggingface dataset:
An Effective Hybrid Approach for Processing Deformation Monitoring Data
Authors: Gao Ning , Cui Xi Min , Gao Cai Yun
Published: February 2012

This paper describes the procedure of a hybrid approach based on grey model and artificial neural network (GM&ANN) to analysis and forecast of deformation data. The GM&ANN is formulated into three steps:(1)according to the monotonously increasing characteristics and the nonlinear characteristics of deformation time series, total deformation can be divided into tendency part and stochastic part.(2) use GM(1,1)to fit the trend of the data and obtain the residual series, on this basis by using artificial neural network to fit the stochastic part (residual series) .Then the forecasting value of deformation is obtained by adding the calculated predictive displacement value of each sub-stack. (3) validate the model. The results of experiments show that this hybrid has higher performances not only on model fitting but also on forecasting and therefore can be applied to deformation data processing.
Application of Surfer 8.0 in Earthwork Calculations and Accuracy Analysis
Authors: Zhang Hao , Li Liang , Liu Zheng , Fu Lin Feng
Published: February 2012

Earthwork calculations are frequently involved in civil engineering. Due to limitations in different terrain conditions and measurement environment, the result of calculation often varies from the fact. Based on existing literatures, this paper builds a mathematical model with some interpolation methods provided by Surfer. We use the model to grid the data, calculate the earthworks, and perform accuracy analysis. The volume of the calculation is proved to be precise enough to be applied to the road and the waterway dredging engineering. The result provides reliable basis to the application of suffer in complex geographical environment such as the river and road.
Research on the Effect of Combined Seismic Isolation System
Authors: Fan Xi Sen , Tian Ting Lei
Published: February 2012

The isolation system between the upper structure and the foundation could reduce the seismic response of the former. A system combined of sliding and lead rubber bearings (LRB) is more effective in seismic isolation than using the later alone. In this research, the seismic responses of a building which was set with LRB and a combined system (the proportions between the sliding and LRB were 1/6, 1/4 and 1/3) respectively were analyzed and compared to that of the building without base isolation system to investigate the effect of seismic isolation. The relationship between isolation coefficient and the proportion of bearings was studied. The results show that the combined system could reduce the seismic response of structure, and it is more effective in seismic isolation if the leading bearing is relatively more.
Traffic Load of Pavement under the Action of the Finite Element Analysis Viscoelastic Fracture
Authors: Liu Han Qing , Wu Gui Xian
Published: February 2012

In the design of the asphalt pavement or asphalt overlay, consider about the viscoelastic fracture mechanics behavior of asphalt mixture is significant in researching the asphalt pavement craze or the extending behavior of reflective crack. This paper employs nonlinear finite element software ABAQUS to analysis about the viscoelastic of asphalt mixture in the basis of the vicoelastic breaking theory, analyze the Traffic dynamic loading different speeds, different grassroots modulus to contain crack pavement structure system of the displacement field and stress field of influence.The calculation results show that the curve of the stress intensity factor in the crack tip moves as the increase of the speed, but the maximum is virtually unchanged; and it is proportional to the grassroots modulus variations, that is the stress intensity factor increases as the increase of grassroots modulus. With the effect of partial load, the stress intensity factor is formed by KⅠ、KⅡ. It is mainly assumed by KⅡ when grassroots modulus is low, and as the grassroots modulus increases, the KⅠ is increases, But KⅡ changes little.
The Control Study of Mass Concrete Floor Temperature Crack
Authors: Guo Wei Tong , Yang Sheng Na
Published: February 2012

Analysis the factors of mass concrete temperature crack. Combined with the Nan Yang Branch of CUCC cement clinker production line of the second phase of mass concrete construction, it proposed some measures about how to prevent the temperature stress crack of mass concrete due to hydration heat of cement generated temperature difference .By controlling the temperature of the concrete strictly, decreasing the temperature difference between inside and outside, preventing shrinkage joint, reducing the slump loss, delaying setting time, etc. To ensure from the construction maintaining process of mass concrete foundation floor, the tensile strength of concrete is always greater than the maximum temperature tensile stress to prevent temperature cracks appear ensure the quality of mass concrete construction.
A Simplified Model of SSI Dynamic Analysis
Authors: Zhang Zhi Ying , Li Ying , Sun Qing
Published: February 2012

Aiming at the problem of dynamic analysis of SSI system, the dynamic influence of different parts of foundation soil is studied on the linear elastic assumption according to the actual mechanism of Soil-Structure Interaction (SSI); in addition, a simplified model on the condition of the lumped mass method is put forward and the corresponding motion equations of SSI system are built, which can be a reference for the structural seismic design method considering SSI effect.
Remediation and Improvement of Concrete by Bacterial Mediated Carbonate Deposition
Authors: Li Pei Hao , Wang Kun , Wang Zhong Jin
Published: February 2012

Bio-deposition has led to the exploration of remediation and improvement technique in the field of cementitious materials. The aim of this study was to investigate the effects of bio-deposited carbonate on parameters affecting concrete properties and the effects of bio-deposition on the durability of concrete specimens. The remediation efficacy of cracks in concrete was studied through compressive strength test and flexural failure test. Water absorption and the resistance towards carbonation of concrete were analyzed by water absorptivity test and concrete accelerated carbonation test, respectively. Experimental results show that bio-deposition is able to make the improvement in concrete compressive strength and the remediation of cracks. Bacterial deposition of calcite on the surface of the concrete specimens results in a decrease of capillary water uptake and carbonation rate constant, and an increase in resistance towards degradation processes.
Tensile Strength Test and Analysis for Bolts with Hot-Dip Galvanizing
Authors: Peng Yi Liang , Yang Jun Fen , Li Hong Bo , Han Xuan Min
Published: February 2012

Bolt connection is a usual connection in power transmission and power transformation steel structures, and preservative treatments such as rust removal and galvanization are adopted to protect the bolts. In order to investigate the influence of hot-dip galvanizing on the tensile strength of bolt, common strength bolts and high strength bolt produced in four factories were tested to gain tensile strength. The results indicate that hot-dip galvanizing may reduce the tensile strength of bolts, and galvanizing technics of different factory have difference influence on the tensile strength of bolts.
The Optical Fiber Strain Monitoring Technology of Large-Scale Bridge
Authors: Chen Shu Li , Su Mu Biao
Published: February 2012

Application situation of optical fiber strain sensor used in bridge structure state monitoring is detailed introduced in this paper, two bridges which optical fiber strain sensor is adopted in construction stage stress monitoring and long-time stress monitoring in our country are introduced as example. According to the theoretical analysis of structures, the strain monitoring locations are selected. The composite technology between optical fiber strain sensor and concrete is researched. The installation technology and protect method between optical fiber strain sensor and steel girder are extracted, and advanced acquisition software is explored. Finally, the application foreground of optical fiber strain sensor is discussed. The research result indicates that the optical fiber strain sensor is extraordinary suitable for state monitoring of bridge structure because it has the merits of light structure and reliable performance.
The Experimental Study of Post-Embedded RC Bending Members with Inorganic Anchoring Material under Repeated Load
Authors: Sun Hua Ming , Zhou Xin Gang , Bao Hai Zhen
Published: February 2012

The experiment of post-embedded RC bending members with inorganic anchoring material and integral casting RC member under repeated load is conducted for the parameters with anchorage depth(15D,20D) and concrete strength grade(C20,C30). Comparing and analyzing the experimental phenomenon and data, the failure mechanism, anchorage behavior, the bearing capacity and seismic behavior of these members.
Static Elasto-Plastic Analysis on Mega Steel Frame-Prestressed Composite Bracing Structure
Authors: Shao Jian Hua , Xu Ren Hai , Tang Bai Jian
Published: February 2012

Based on the two different lateral load distributions of the uniform distribution and the inverse triangle distribution, the mechanical characteristic and failure mode of mega steel frame-prestressed composite bracing structure under the different lateral load distributions are studied by using the pushover analytical method in this paper. The results indicate that the failure modes of all members of the mega steel frame-prestressed composite bracing structure under lateral loads are as follows: supports between the giant column limbs appear to yield at first, and then the giant beams, floor beams, giant column limbs, giant Λ-shape steel brace truss in order.
Soap-Free Emulsion Polymerization for New Building Sealant
Authors: Li Jing Jing , Gao Guang Ying , Wang Yu Fei , Guo Lin
Published: February 2012

In order to obtain functional polymer latex with surface carboxyl groups which can enhance colloidal stability and alkali viscosity, a molecular design was carried out and novel latex for building sealant was synthesized by using the technology of soap-free emulsion and core-shell polymerization. The monomer component, initiator, reaction temperature, adding mode of raw materials, carboxylation of colloidal particle and application of cross-linking reaction in molecular design were investigated. The suitable formula and process conditions were defined.
Monitoring and Analysis of Railway Bridge Pier Deformation of Municipal Engineering Crossing underneath Beijing-Shanghai High Speed Railway
Authors: Zhang Yu Zhi , Du Yan Liang , Sun Bao Chen
Published: February 2012

Taking the bridge pier monitoring when a municipal engineering was passing through Beijing-Shanghai High Speed Railway (BSHR) as a example, monitoring plan, its implementation of automatic monitoring combined with manual control and comprehensive analysis of monitoring data are introduced ,to provide theoretical reference for similar engineering monitoring plan design .
Strength Attenuation and Post Failure Behaviour of Fine Sandstone
Authors: Zhou Ji Jun , Fu Huai , Zhang Yue , Li Yan , Zhang De
Published: February 2012

Three types of physical tests were designed to study post failure behaviour and strength attenuation of fine sandstone. Tests include rock compression test, rock unloading test and rock block shear test. The stress-strain curves at different confining pressures had been obtained as well as axial strain-lateral strain curves. The differences of axial strain-lateral strain curves exhibit that stress peak point and the point of fault formation are apparently different for the rock. After the fault is generated, fractured rock slides on the fault surfaces, while confining pressure, material strength and structure effect decide the post failure behaviour. Damaged rock specimens were poured in concrete specimens as well as irregular blocks. Material strength of rock blocks was attained. Shear strength gradually attenuates with unloading points close to the peak. Past the stress peak, rock blocks from fractured rock still have considerable material strength. It is shown that there are differences of strength parameters obtained from direct shear test and triaxial test.
A Numerical Analytical Method for Singularity Problem in V-Type Notch
Authors: Yang Chao , Zhou Zhen Huan , Xu Xin Sheng
Published: February 2012

In this paper, a numerical analytical method for singularity problem in V-type notch is presented based on Hamiltonian system. The method has an advantage that all boundary conditions can be considered with one model, and belongs to a general numerical method. Results show that the singularity of the problem relates to the opening angle of the V-type notch where the crack is just a special case. Further, numerical results give rules of stress distribution under various conditions.
The Finite Element Model Study of the Pre-Twisted Euler Beam
Authors: Huang Ying , Chen Chang Hong , Shan Jian
Published: February 2012

Based on the traditional mechanical model of straight beam, the paper makes a systematic analysis and research on the pre-twisted Euler beam finite element numerical model. The paper uses two-node model of 12 degrees of freedom, axial displacement interpolation function using 2-node Lagrange interpolation function, beam transverse bending displacements (u and υ) still use the cubic displacement, bending with torsion angle displacement function using cubic polynomial displacement function. Firstly, based on the author previous literature on the flexure strain relationship, the paper deduces the element stiffness matrix of the pre-twisted beam. Finally, by calculating the pre-twisted rectangle section beam example, and contrasting three-dimensional solid finite element using ANSYS, the comparative analysis results show that pre-twisted Euler beam element stiffness matrix has good accuracy.
Nature Frequency Identification of Prestressed Concrete Beam with RBF Network
Authors: Li Rui Ge , Yang Guo Li
Published: February 2012

Abstract. The relationship of pre-stressed concrete (PSC) beam natural frequency and pre-stressed force is difficult to described accurately with mechanical model. The past experimental data are collected. Then five unbonded post-tensioned PSC beams are designed. Frequencies and damps are collected in the dynamic experiment of five PSC beams. Radial basis function neural network is constructed to identify the natural frequencies of prestressed beam with different levels prestressing force based on previous test data and new dynamic test beam data. Then the input and output node numbers of neural network are selected and the appropriate training algorithm and expansion coefficient is determined. In order to verify that the network performance, one prestressed concrete beam test data are left to simulation test. Simulation results show that the radial basis function neural network is feasibility to recognize the frequency of PSC beams.
The Study of Meshless Method Simulation of Plate Bending Problem
Authors: Jiao Yu Ling , Meng Guang Wei , Qin Xu Xi
Published: February 2012

moving least square meshless method is a numerical approximation based on points that do not generate the grid of cells, as long as the node information. Basis function and weight function meshless method for the calculation of accuracy have a significant impact. In order to compare the order of the base functions and powers of the radius of influence domain function meshless method for computational accuracy and efficiency , this paper selected first, second and third basis function and spline-type weight function in a different influence domain radius, respectively construct the field function. Mindlin plate element is derived based on the format of the plate bending problem meshless discrete equations. Programming examples are calculated with elastic plate bending problems non-grid solutions, and analysis and comparison of their accuracy and efficiency, results show that the meshless method using elastic plate bending problem is feasible and effective.
Key Construction Technology of Fair-Faced Concrete on China Qingdao Zhuoting Plaza Project
Authors: Sun Yong , Wang Yan Ming , Yu Yi Zhuo , Cheng Lei , Guo Pei Pei
Published: February 2012

Construction technology of fair-faced concrete was successfully used in China Qingdao Zhuoting plaza project. Its No.1 and No.2 dwelling houses are high-rise buildings and their posts and external walls were constructed with fair-faced concrete. As it is the highest fair-faced concrete project in China with 99.95m in height , four different concrete strength grades from C35 to C50 on different floors,370 days construction period through different four seasons in a year, the project meets a lot of problems and challenges. In this article, some innovations and key construction technologies were studied and used which make the project be successfully completed.
Heaped Load Experiment Research on Glass Fiber Mat Reinforced Thermo Plastics Formwork Support Unit
Authors: Cai Xue Feng , Zhuang Jin Ping , Tuo Ming Bei
Published: February 2012

Four formwork support units were experimental studied by heaping load,including three glass fiber mat reinforced thermo plastics (GMT) formwork support units and one 18mm plywood formwork support unit. Compared with 18mm plywood formwork support unit, the vertical poles force distribution in GMT formwork support units were analyzed. The experimental parameter also included vertical poles height difference and their values were follows: 0mm, 2mm and 4mm. The results showed that the vertical poles force distribution are uneven in GMT formwork support unit and vertical pole height differences have influence on their force distribution.
The Study on the Installation Process of Flue Gas Heat Exchanger
Authors: Li Xue Tao
Published: February 2012

At present, the installation of flue gas heat exchanger have not uniform method of working at home and abroad. The Install process using different items, By analyzing the duration and cost of using different construction techniques of several 2 × 200MW-scale projects,I found that the range of 31% difference in duration, the cost difference between the range of 23% (having regard to price factors),it is necessary to develop efficient installation process to reduce costs and improve efficiency. The study of this process more than 2 × 200MW unit boiler desulfurization system installation to determine the formation of national construction method and lay a solid foundation.
Seismic Design Scope of Tower Structures for UHV Transmission Lines on the Zone of Earthquake Fortification Intensity 8
Authors: Zheng Ni Na , Li Ying Min , Zhao Jing , Chen Zheng Lun
Published: February 2012

The seismic action effects of tower structures for ultra-high-voltage(UHV, upon 750KV) overhead transmission lines are much greater than those of 500KV and below, it is necessary to inspect the control load in structural design and specify the seismic design scope of tower structures for these UHV transmission lines. In this paper, the current regulations of seismic design and non-seismic design of tower structures for overhead transmission line were contrasted firstly; then, a series of typical towers including large-crossing towers and cup-towers at soft sites, on the zone of earthquake fortification intensity region of 8, were analyzed. The ratios of seismic action effects and wind load effects for characteristic value were calculated and the control load in structural design of tower structure was investigated. The results show that, although the height and the weigth of tower structures for UHV transmission lines are increasing, the control load in structural design is still the wind load on the zone of earthquake fortification intensity region of 8 and below.
Thermal Properties of Vacuum Insulation Panels with Glass Fiber
Authors: Wu Wang Ping , Chen Zhao Feng , Zhou Jie Ming , Cheng Xue Yu
Published: February 2012

The VIPs consist of the glass-fiber core material and two types of envelope film. The glass fiber was fabricated by a centrifugal blowing process. The core material was prepared by the wet method. The thermal conductivities of the core material and VIPs were measured by the heat flow meter. The thermal conductivity for six pieces of 1mm thick core material is less than that for one piece of 6mm thick core material, which is affected by the fiber diameter, porosity ratio and the largest pore size diameter. The VIP for the building material has a low thermal conductivity (<0.008W/mK). The VIP for the home appliance has a lower thermal conductivity (<0.003W/mK). The VIP maintains a high-uniform thermal conductivity values due to the getter effect.
Numerical Simulation on Penetration Properties of Concrete Based on Random Particle Model
Authors: Peng Yun , Fu Yu , Liu Xiao Ling , Tao Jun Lin , Yao Yong
Published: February 2012

As an important building material, concrete is widely used in military and civil areas for its superiorities, such as civil engineering, hydraulic engineering, protection engineering and so on. It is necessary to research its dynamic mechanical properties under strong shock loading. The concrete is considered as a composite material which is made of aggregate particles and cement paste from micromechanical angle. This paper uses random function to establish random particle model and simulates dynamic mechanical responses of concrete under strong shock loading based on random particle model using ANSYS/LS-DYNA.
Risk Prevention and Control Measures in Highway Design and Construction Turnkey Project
Authors: Peng Jun Long
Published: February 2012

In order to ensure the highway design and construction turnkey project smooth implementation, it is necessary to proactively consider risks produced by highway design and construction turnkey model, and to input specific risk prevention and corresponding risk control measures. This paper firstly discusses risk control measures for highway design and construction turnkey model. Then, risk is reasonably contributed both the owners and general contractors. The risk range has also be defined between the owner and general contractor. In the ending of this article, there are some recommendations about risk prevention and control measures for highway design and construction turnkey project.
Shake Table Test of Complex High-Rise Building Equipped with Torsional Vibration Control Device
Authors: Zhao Bin , He Juan , Gao Hui , Chen Xu Gang
Published: February 2012

For many high-rising buildings, large local space is very useful for its special function needs, such as conference hall and hotel lobby. The shake table test results of a high-rising building with large local space show that the dynamic characteristics of such structure are complex and the torsional mode becomes the first mode, while the torsional responses under earthquake excitation, especially of the floor just above the large local space, are very remarkable. In this paper, the bidirectional Tuned Mass Damper (TMD) is employed for reducing the torsional vibration of such complex high-rise building structure. A reduced-scale model is design and constructed. A series of shake table tests are carried out and the test results indicate that the TMD system is very effective in torsional vibration control of structural system.
Application and Experimental Study on Seismic Behavior of Composite Core Walls with STRC Columns
Authors: Dong Hong Ying , Cao Wan Lin , Zhang Jian Wei
Published: February 2012

According to the structural design in a project in Dalian, experimental study on seismic behavior of composite core walls with steel tube-reinforced concrete (STRC) columns were carried out. Five 1/6 scale composite core wall specimens with different steel reinforced details in the walls and different openings on the walls were designed and tested under cyclic loading. Based on the experiment, hysteretic property, load-carrying capacity, ductility, energy dissipation capacity and damage characteristics of the five specimens were compared and analyzed. The results show that the core walls with STRC columns have good seismic behavior. And the seismic behavior can be greatly improved by setting concealed steel trusses in the walls.
Geometric Parameter Design of Self-Locking Foldable Latticed Shells in Deployment Process
Authors: Lu Cheng Jiang , Zhao Hong Bin
Published: February 2012

Foldable structures are rapid to erect and easy to collapse for reuse. Four basically geometric design parameters of self-locking foldable latticed shell unit were defined. The recommended ranges of the geometric parameters and cross-section sizes were given by investigating foldable latticed shell units using ANSYS, with the consideration of element stability and the requirements of elastic design.
Structural Analysis and Internal Force Calculation of Variable Cross-Section Silo
Authors: Ma Rui Ting
Published: February 2012

In this paper, the differential element of constant-section silo wall suffering from axially symmetric load is analyzed. From the results of constant-section silo, the author derives the displacements and internal forces of variable cross-section silo. Through a specific example, this paper compares the displacements , internal forces and concrete consumption of variable cross-section silo with those of constant-section silo, and discusses the merits of variable cross-section silo.
A Comprehensive Study of the Seismic Requirements for Bond between Concrete and Reinforcing Steel
Authors: Bsisu Khair Al Deen Isam , Hunaiti Yasser
Published: February 2012

In this paper the nature of bond stresses are studied for different regions of reinforced concrete elements subjected to flexure and shear, various literature articles on the subject are reviewed and the seismic effect for bond and development length is discussed.
Research on the Ultimate Bearing Capacity Analysis of TK-Joints by Finite Element Analysis
Authors: Cao Li Hui , Yu Yan , Zhang Yu
Published: February 2012

By considering the nonlinearity of material and geometric, the finite element analysis is performed for the circular tubular TK-Joints to demonstrate the stress distribution. plastic-zones and deformation of joints is studied on multi-planer XK steel tubular joints through various geometric parameters by using the nonlinear finite element analysis in this paper. The primary parameters and the influence of these parameters on the ultimate strength are investigated. Based on the bearing capacity formula of K- joint and some reference data, the strength formula for multi-planar XK joints is suggested in view of the effects of multi-staff intersection and multi-axis bearing force. These formulas provide the academic basis for construction design.
Kinetics of Nitrites Adsorption on AB2 Type Hyperbranched Poly(Amine Ester) Modified by Trichloroctadecylsilan
Authors: Bai Li Bin , An Ye Na , Wang Ai Qing , Zhang Hai Song , Pan Xin Xin , Ba Xin Wu
Published: February 2012

The AB2 type hyperbranched poly(amine ester) (HBPAE) can be used as adsorbent to adsorb nitrite from aqueous solution due to a large number of terminal hydroxyl groups, where the hydrogen-bonds could formed between OH and NO2-. However, the hydrophilic properties of HBPAE limited their utility in the application because of the difficulties in removing adsorbent from nitrite solution after the adsorption was finished. The hydrophilic properties of the HBPAE were changed by means of end capping method, where the trichloroctadecylsilan (OTS) was adopted as the hydrophobic alkyl chains. The modified HBPAE by OTS can be separated from the aqueous solution. The adsorption kinetics of nitrite from aqueous solutions onto modified HBPAE was investigated to show the pseudo-first-order kinetic mechanism. The equilibrium adsorption data were found to be well fitted by Freundlich isotherm equation.
Elasto-Plastic Analysis of Large Span Reticulated Shell Structure under Multi-Support Excitations
Authors: Bai Fu Yu , Liu Jun Qing , Li Long
Published: February 2012

It established Multi-Support excitations time history analysis model Based on large quality method. It took large span reticulated shell for example, chose EL-centro wave to carry on the spectrum analysis and time history analysis with direct integral method, studied the deformation capacity and destruction features of structure under rare earthquake of magnitude of 8, and put forward the seismic performance’s related measures and suggestions in elasto-plastic analysis of the large span reticulated shell under multi-support excitations for the actual engineering reference in design.
Research on Seismic Performance of Core Wall in Hybrid Structure
Authors: Cai Hai Yong , Guo Lei , Chu Liu Sheng
Published: February 2012

The ductility of primary lateral resisting member, i.e. Core wall is analyzed using finite element program ADINA. The influencing factors like aspect ratio, concrete grade, axial compression ratio, reinforcement ratio,boundary confinement and reinforcement ratio of boundary element etc. are considered in the analysis. Based on the aforementioned research, some suggestions for the design of core wall in hybrid structure are proposed.
Influences of Horizontal Strengthened Storey on Foundation Settlement in High-Rise Frame Tube Structure
Authors: Liu Xi Ping
Published: February 2012

Utilizing finite element program to calculate and analyze the settlement of eight models of frame tube structure with horizontal strengthened storey under the vertical loads, the conclusions are as below: Initially, setting strengthened storey effectively reduces the non-homogenious foundation settlement; Additionally, founfation settlement situations are different as the strengthened storey location changes. Generally, the closer strengthened storey to the substructure is, the better the effects on resisting non-homogenious settlement are.
Computer Modeling and Parametric Study of Thermal Effects in Integral Abutment Bridge
Authors: Awad Mohammed , Yu Tian Lai
Published: February 2012

Structural behavior of concrete integral abutment bridge subjected to temperature rise was investigated through a numerical modeling and parametric study. Long-term, field monitoring through the summer was performed on Industrial Park Bridge located in Heilongjiang province, China from June 13, 2010 until June 28, 2010. The collected data was used to validate the accuracy of a 3D-finite element model of the bridge which took into account soil-structure interaction. Based on the calibrated finite element model a parametric study considered two parameters, bridge length and abutment height, was carried out to investigate the effects of this parameters on structural behavior of integral abutment bridge subject to temperature rise. It was determined that Thermal load in the superstructure of the integral bridge develop significant magnitudes of bending and axial forces in the superstructure. The largest magnitude of thermally induced moment always occurs near the abutment, and axial force is constant across the length of each span. For bridge thermal expansion, longer bridges and taller abutments cause larger thermally induced superstructure axial force due to development of higher backfill pressure. Generally span length has a higher influence for thermally induced superstructure forces in terms of axial force and bending moment than the abutment height.
Influence of the Opening’s Position on Seismic Performance of Autoclaved Aerated Concrete Composite Wall with Core Columns
Authors: Wu Hui Ge , Chen Ji Hua , Gu Jie
Published: February 2012

To study the seismic performance of autoclaved aerated concrete (AAC) block masonry composite wall with reinforced concrete (RC) columns, a non-linear finite element analysis has been carried out for the walls with openings using the finite element software ABAQUS. First results of finite element analysis were verified with experiment results of full-scale specimen. And then the effect of the opening’s position on seismic performance was studied with finite element analysis. The result indicates that the ultimate load capacity and ultimate displacement are both increased with the upward and outward movement of the openings.
Comparison of Mechanical Properties between Grid Frame Core-Tube Structure and Tube Structure
Authors: Wang Qi Ming , Ma Ke Jian , Chen Zhi Hua , Sun Tao
Published: February 2012

Reinforced concrete grid frame core-tube structure system is a new system. This article draws the conclusion that grid frame core-tube has high stiffness and obvious space affection, and that its basic mechanics properties is better than frame core-tube structure and similar to tube structure through the comparison of two tube structure systems, which the Inner tube is similar to grid frame core-tube and the outer tubes respectively are frame and high beam - column frame tube. It puts forward some reasonable suggestions for the future designation of this structural system.
Numerical Analysis on Bending Deep Beams with Different Moduli in Tension and Compression
Authors: Sun Jun Yi , Cai Zhen Hong , Zheng Zhou Lian , He Xiao Ting
Published: February 2012

Based on the numerically iterative technique, we introduce the shear modulus pattern used for accelerating convergence and rebuild the iterative program. Using this program, we analyze the bending problem of a bimodular deep beam under the action of uniformly distributed loads, in which the different ratios of span length to height of the beam, and of elastic modulus in compression to that in tension, are considered. The results show that the bimodularity have great influences on the bending stress and the deflection of deep beam.
Nonlocal Dynamic Model of Doubly Clamped Initially Tensioned Beams Accounting for Small Size Effects
Authors: Li Cheng , Huang Wei Guo
Published: February 2012

Transverse vibration of an Euler-Bernoulli beam with initial axial force is investigated based on nonlocal continuum mechanics. The size effect is considered and a small intrinsic length scale is adopted into the problem model. The linear partial differential equation governing transverse motion is derived. The model is solved for a doubly clamped beam. Expression of natural frequency is obtained. The correlations between the first two order natural frequencies and the small size parameter are also presented and discussed. The bending stiffness and small size effect are proved to play significant roles in dynamic behaviors of nonlocal beams.
Estimation of Dynamic Wind Pressure for Multi-Span Greenhouse Structural Design
Authors: Sun De Fa
Published: February 2012

Based on the contrast analysis of loads provided in foreign and China standards, analysis and discussion are mentioned about the definition and estimation of dynamic wind pressures for multi-span greenhouse structural design in details. Meanwhile, taking advantage of past experience in greenhouse structural design a practical method which can be used in greenhouse design was given for wind loads. Under the present conditions, it is relative safety in calculation wind loads according to Load code for the design of building structures (GB 50009-2001), yet it is unnecessary to make modification of statistical reappearing factor in calculation wind load-dynamic pressure when considering the coefficients of wind pressure depending on height and the gust factor according to Greenhouse structure design load (GB/T 18622-2002).
Application of Fly Ash and Coal Gangue for Preparing High-Class Solid Insulating Brick by Roasting at Low Temperature Conditions
Authors: Xu Zi Fang , Zhang Ming Xu , Zhu Jin Bo
Published: February 2012

Abstract: The fly ash and coal gangue were used as main raw materials to roast solid insulating brick.Lower than solid clay brick (300 °C) which belongs to low temperature roasting , roasting time cycle is 24 h ,the ratio of fly ash and coal gangue is 60% :35%. the B7 admixing expanded pearlite compressive strength is 30.25 MPa . Strength reach general clay brick MU30 high-class level .Thermal coefficient of conduction is 0.4 W/(m.K), lower than general clay brick thermal coefficient of conduction 0.78 W/(m.K); In addition , B7 XRD pattern has evident quartz、mullite diffraction character peak and TGA-DTA pattern between 900°C~1200°C, following temperature rise, green body heat-absorbing , begin melt 、glass reduction .The result is high in strengths . SEM scanning show : after being roasted in 950°C , globular solid glass bead 、pearlitic drusy pearlite 、flocculation aluminosilicate phase and so on , raw materials particle interstices were filled with viscous hyaline, so that B7 turned out high strengths . Acidproof、alkaliproof、freezing test and strengths results show: the lasting quality of solid insulating brick was best.
Dynamic Simulation of Sluice Foundation Piping Using Variable Grid Method
Authors: Zhang Xiao Yue , Yan Jun
Published: February 2012

The occurrence of underground piping is a pluralistic and complex problem. Due to the great difficulty of the 3D dynamic simulation of piping both by theoretical and numerical analysis, currently there is no satisfactory mathematical model and numerical analysis software for it. In order to simulate the piping development process of sluice or dike foundation, in this paper, the 3D steady-unsteady saturated-unsaturated FEM seepage simulation method is used, and the concepts of destroyed element and variable grid method are introduced. The destroyed elements are removed from the original grid during the iterative calculation process, and the corresponding procedure for the 3D steady-unsteady piping process of sluice foundation is designed. Using appropriate post-processing program, the whole piping development of a sluice foundation can be displayed. A piping test of a sluice foundation model is simulated by the method provided in this paper. For the comparison of the experimental result and the simulation result, they showed very good agreement, which can verify the correctness of the piping simulation and programming methods given in this paper.
Numercial Analysis of Square Steel Tubular Columns Filled with Steel Reinforced Concrete Subjected to Eccentric Load
Authors: Yu Guo Feng , Zhao Xu Dong , Sui Hai Yu
Published: February 2012

This paper developed numerical analysis program. Results agree well with the tested ones.So the numerical analysis method can be used to estimate the bearing capacity and deformation.
Reduce, Reuse, Recycle and Recovery in Sustainable Construction Waste Management
Authors: Kazerooni Sadi M.A , Abdullah Arham , Navazandeh Sajoudi Masoud , Kamal M.F.M. , Torshizi Fatemeh , Taherkhani R
Published: February 2012

The construction industry consumes a substantial amount of raw materials in its processes and the output is obviously the product and most importantly the waste material. Other than that, the construction industry is well known as one of the worst environmental polluters. This study is to determine the use of waste minimisation technique in creating sustainable waste management in order to identify the technique which has the most capabilities to reduce on-site waste. The objective of this study is to assess the waste minimization techniques taken from the 4R concept (which includes reduce, reuse, recycle and recovery techniques) in minimizing the waste in construction waste management. The most used waste minimization technique found in the 4R concept would be waste reduction. This shows that the local construction industry has the knowledge necessary to plan out the waste management processes but the implementation is still far from satisfying. Additionally, the findings reveal that because the industry is profit-driven, construction practitioners are motivated by profit to adapt to this techniques.
Analysis on the Seismic Response of Hangzhou Metro Tunnel in Soft Soils
Authors: Wang Guo Cai , Yao Jun , Sha Ling , Yu Lin Chun , Zheng Xu Wei
Published: February 2012

A large number of earthquake disasters indicate that the underground structure, such as metro tunnel, is not safe and reliable as people think, and can also be destroyed and collapsed under dynamic load, e.g. earthquake. Therefore, it is necessary to study the seismic response analysis of underground structure in great detail for underground structure under dynamic loading, especially under the earthquake load. Hence, in view of the soft soil of Hangzhou, the 3D non-linear finite element software ADINA is used to study the seismic response of section tunnel of Hangzhou metro line 1, to summarize the earthquake response characteristics of the subway underground structure, and to provide the calculation results of metro tunnel’s seismic response and the change rule of lining deformation and stress. The conclusions obtained can provide some reference values in the seismic design of metro tunnel in soft soil regions.
The Research of New Construction Model in a Comprehensive Community of New Rural
Authors: Hua Qiu Yue
Published: February 2012

From the practices of new rural construction, reflecting the nature of “three-in-one planning”, it is only through “three-in-one planning” and two different construction standards that can improve support conditions in economy and land resources, realizing the sustainable development in new rural. This paper set an example of Lingxing comprehensive community planning which is located in FengHuang, Xinzhou district, Wuhan city.
Designing of Small Town Based on its Characteristics
Authors: Wu Si Biao , Li Hui , Liu Gang
Published: February 2012

Small town’s characteristics are different and unique. Their characteristics development must be based on their objective reality, carrying on the scientific and reasonable planning, accurately assessment for themselves, and fully displaying of their social efficiency. Some small town's construction in our country lack respective characteristics, so now we urgently need to solve this problem, and find a method to cultivate the small town’s respective characteristics. The overall plan of small towns should link to the reality, deal with changes and innovation, while guaranteeing complete plan content and emphasizing more on characteristic design.
The Landscape and the Spatial Design Research of the City Wall Ruins Park of the Old City at Xiaoyi
Authors: Han Wei Cheng , Shen Rui
Published: February 2012

The city wall ruins park of the old city at Xiaoyi is a ruins park with the city wall as the main body. With the amusement belt formed by the cultural and historical city wall ruins and the moat, and the landscape belt formed by the historical and cultural city block, and also using the design of the space, the water body, the path and the architectural ornaments, the plan focuses on protecting and inheriting the city wall ruins park of the old city at Xiaoyi with the method of protection, restoration, isolation and so on.
Tactics Research on Green Space System Planning of Song River Summer Resort City in Harbin Based on Experience Perspective
Authors: Guo Rong , Bai Yu Jing
Published: February 2012

With the coming of experience economical times,Customers focus on the satisfaction of spirit to a greater extend, more than pursuing material enjoyment. They focus on pursuit of memorable experience.Through the demand analysis of Song River Summer Resort City in Harbin under the view of experience ,according to the new request of urban green space system planning under experience perspective and the development targets of Song River Summer Resort City will become provincial tourist holiday resort in the future, taking waterfront greenbelt, urban road greenbelt, large-scale parks and roadside garden and so on as basic elements, paper propose green space system planning strategy of establishing leisure entertainment facility combining green space, molding green space of educational significance,organizing green space of diverse function, increasing element of esthetic value and designing large-scale theme park.Thus it has realized the social efficiency of urban green space resource,and has made important contribution for the protection of urban ecological environment .
The Effect of Limestone Powder and Clay Content on MB Value of Manufactured Sand
Authors: Ye Jian Xiong , Yu Lin Wen , Zhang Yi
Published: February 2012

In this paper, the correlation between limestone powder content and MB value in manufactured sand is analyzed and the effect of limestone powder content and clay content of manufactured sand on the MB value is studied, the results show that with the increase of pure limestone powder content, the MB values remained almost unchanged, and were less than 1.0; when the limestone powder content increased from 5% to 15%, with the increase of clay content, the MB value increased gradually; when the limestone powder content was taken as 7%, 12% and 15%, the clay content was taken as1.8%, 2.7% and 2.3% respectively with the MB value kept at 1.0, which still could meet the requirement of the engineering construction standard JGJ52-2006 about clay content.
Study on Eco-Planning of Coal Town Special Land Based on Extenics
Authors: Sun Ming
Published: February 2012

At present, the coal town special land mainly includes subsided, goaf and gangue etc, these lands for ecological restoration and reconstruction is coal town planning research hot spot. The article based on the Extenics method, with the resource exhaustion town theory as a foundation, to coal town special land as empirical research object, through the depth of coal town of space development trends and development orientation, puts forward the gangue land ecological adjustment mode, coal goaf and subsided development countermeasures. Through to the coal town special land ecological adjustment of spatial structure of towns thinking clarify coal optimization idea the feasibility, for cold to coal town of land development to provide certain reference.
Study on Early-Stage Compressive Strength of Recycled Aggregate Concrete
Authors: Liu Xiao Ling , Lei Ting
Published: February 2012

Early compressive strength of recycled aggregate concrete is important for the project. Age of recycled aggregate concrete is 3d、7d、14d、21d、28d, in order to study the relation of the early compressive strength with the replacement rate of recycled aggregate, and study Linear regression of 28d compressive strength with cement-water ratio. In the base of result, formula is given about the early compressive strength of recycled aggregate concrete and proved in good.
Expression of Technological Aesthetics on Contemporary Western Landscape Materials
Authors: Chang Bing , Liu Song Fu
Published: February 2012

Studying on practical cases, this paper analyzes the visual attributes of contemporary western landscape materials, and proposes the expressing rules and important values of Technological aesthetics of landscape design materials through discussions on the form, color and texture of the materials.
The Principle and Methodology of Landscape Eco-Planning
Authors: Sheng Sheng , Du Yun Ling , Rui Jian Liang , Tao Ru Jun
Published: February 2012

Landscape eco-planning is an important approach to keep sustainable development, which can coordinate the relationship between man, nature and resource use. The landscape eco-planning in the future not only must meet the need of landscape's natural function and human, but also need to meet the need of sustainable use of the land. This article discusses the concept, the main principles, procedures and methods of landscape eco-planning, and clarifies the GIS technology in the use of landscape planning and design, in order to play a promote role in the landscape eco-planning in China.