bluuebunny/crossref_metadata_2025 huggingface dataset:
An Investigation on Bending Capacity of Support Stiffness Wall-Slab Structural System by Using Single Layer and Double Layer of Rebar for Residential Project
Authors: Yee Hooi Min , Hani Ismail Siti Isma
Published: February 2012

Wall-slab structural system is a system suitable for use in the field of high-rise building where the main load resisting system is in the form rigidly connected wall slab member. Concrete vertical walls may serve both architecturally partitions and structurally to carry gravity and lateral loading. Moment transfer of joint is an important aspect for proper structurally functioning of wall-slab system. Hence, the main aim of this study is to investigate experimentally the effect of reinforcement details in the wall on bending capacity for support stiffness in wall-slab system for residential project in Malaysia. A total of six wall specimens were tested based on the specification given by the project contractor. Three of this specimens consisted single layer of rebar while another three specimen consisted of double layer of rebar. The size of the wall-slab’s specimens is 1000mm in length (L), 1080mm in width (W), 1000mm in height (H) and 80mm in thickness (T). The average concrete strength was 23.49MPa with Grade 30N/mm2 and the average yield strength of R5 bar was 817MPa. The predicted bending capacity at failure is in the range from 5.36kNm to 7.12kNm, depending on actual concrete cover. The bending capacity at failure for single layered of rebar in wall for specimen 1, 2 and 3 were found to be 3.59kNm, 3.81kNm and 3.15kNm, respectively. The bending capacity at failure for double layered of rebar in wall for specimen 1, 2 and 3 were 5.50kNm, 6.31kNm and 7.00kNm, respectively. The average percentage difference in stiffness of double layered of rebar in wall based on load-deflection curve obtained is in the range from 116.17% to 289.88% higher than single layered of rebar in wall. Based on the experimental results, specimens consisted of double layered of rebar in wall is found to provide higher bending capacity to the joint of wall-slab structural system in the range from 56.25% to 98.86% compared with single layered of rebar in wall.
Construction Technology and Benefit Analysis of Fair-Faced Concrete in High-Rise Building
Authors: Sun Yong , Wang Yan Ming , Cheng Lei , Zhu Xiao Lian
Published: February 2012

As a new kind of concrete construction technology, fair-faced concrete is still not mature and applied widely in China by present. But it was successfully used in China Qingdao Zhuoting plaza project. Its No.1 and No.2 dwelling houses are high-rise buildings with thirty-two stories and their external walls were constructed with fair-faced concrete. As it is the highest fair-faced concrete project in China with 99.95m in height and 370 days construction period through four seasons in a year, the project meets a lot of problems and challenges. So some innovative construction technologies were studied and used which make the project smoothly and successfully completed and get many significant economic, social and environmental benefits.
Seismic Response Analysis on Continuous Rigid-Frame Bridges with High Piers Based on Fiber Model
Authors: Jia Kai Wu , Liu Ming Quan , Song Xi Min , Kang Hong Zhen
Published: February 2012

In this paper, with the help of program Thufiber, fiber model is used to simulate bridge piers, solid element is used to simulate the superstructure in program MSC.Marc. The effects of the travelling wave on the nonlinear seismic response of the long-span continuous rigid-frame bridge with high piers are analyzed under 2008 Wenchuan Earthquake Wave excitation. The results show that travelling wave has much effect on displacement and shear force of high piers of the bridge. The displacement of the pier top decreases 20% to 50% and the shear force at the pier base increases from 20% to 30%.
Finite Element Modelling for Characterizing some Dynamical Properties of a Masonry Building Prototype
Authors: Cancellara Donato , De Angelis Fabio , Pasquino Vittorio
Published: February 2012

A finite element modelling of a masonry building prototype is illustrated in this paper. A computational analysis describing the dynamic behavior of the structure is presented in order to characterize some dynamical features of the system under the effect of harmonic forces of different intensity. The structure is represented by a two-story masonry building characterized by a regular floor plan. The finite element modelling of the structure intends to reproduce an experimental test of the masonry building subject to a harmonic force input supplied by a vibrodyne. Frequency response functions corresponding to the frequency load inputs are reported for different monitored nodal points of the finite element mesh. In this way by comparison with the experimental results obtained in a parallel study it is possible to suitably assess the calibration of the parameters for characterizing the dynamical behaviour of the masonry structure.
An Investigation of Procedures of Change Orders’ Control in Roadway Construction Projects
Authors: Pourrostam Towhid , Ismail Amiruddin , Soleymanzadeh Amir , Gouyounchizad Majid
Published: February 2012

Change order is a frequent phenomenon in most construction projects. However, these changes can be controlled when their causes are known. This report is set to find out the various techniques through which this phenomenon can be controlled most especially in the roadway construction projects in south of Iran. In order to reduce this occurrence to the minimum, certain mechanisms have been identified as being very effective and these are clearly the project objectives and scope of change order of work, provision of complete documentation, finalize the design during the design phase. The outcomes of this study would provide necessary information that may be used by employers and contractors to minimize cases of change orders in construction projects. Moreover, it is anticipated that the results of this study will assist greatly in reducing the total cost of construction works and the time of completion of the project hence increase the efficiency of the work.
Pushover Analysis of Light-Weight Steel Portal Frame Structures under Strong Wind Loading
Authors: Chen Shui Fu , Gong Ying
Published: February 2012

An elastic-plastic pushover analysis has been performed to a typical two-bay light-weight steel portal frame for investigation of the nonlinear load-deformation behaviors of the structure under strong wind loading. The finite-element model is first established for the portal frame. Then the monotonically increased lateral load and uniformly distributed vertical load representing wind loading are applied to the frame while the structure deforms from full elastic range to elastic-plastic stage. The loading process continues until the top displacement reaches its target value or enough number of plastic hinges occurs so that the structure changes to an unstable mechanism. The analysis results indicate that different lateral loading modes (top point loading or uniformly distributed loading) lead to almost the same deformation and failure behavior of the frame, and the final load-carrying capacity of the frame considerably decreases with increase of the vertical loading.
Study on the Seismic Behavior of Buckling Restrained Braced Steel Frames
Authors: Liu Guo Qi , Song Jian
Published: February 2012

This paper presents a suitable solution of studying on the performance of energy consumption of BRB. The hysteretic curve of BRB is got with finite element software, and is lead into steel frame by virtual hinge. The results show that the BRB has more advantages in reducing the structural displacement and protecting the safety of the main structure compared with the general braces.
Experimental Study on Seismic Behavior of Small-Sized Fly Ash Hollow Block Wall
Authors: Xu Ming , Peng Zhu , Chen Meng Jing , Chen Zhong Fan
Published: February 2012

Based on the experiment of five full-scale small-sized fly ash hollow block walls under low-cycle reversed load, the influence of aspect ratio, common horizontal reinforcement, size of structural column section to the loading process, failure characteristics, cracking load, ultimate load, deformation, ductility, stiffness and energy dissipation of the walls was studied. Simultaneously the mechanical properties and work mechanism of the small-sized fly ash hollow block wall has been analyzed.
A New Method to Cable Performance Assessment
Authors: Sun Xiao Yu , Wang Zhen Qing , Meng Xiang Nan , Ju Zhu
Published: February 2012

This paper presents a new approach to thermal field sensitivities and ampacity computations of underground power cables using a proposed algorithm of perturbed finite-element analysis. Domain-specific visual language tools have become important in many domains of software engineering and end user development. Numerical results show that the most significant randomness comes from thermal loads and also that the amount of uncertainty decreases from input to output. We will show that the object-oriented programming greatly simplifies the choice and the implementation of other formalisms concerning polyarticulated systems, thus conferring high flexibility and adaptability to the developed software.Such experimental verification confirmed the accuracy of the new introduced finite-element sensitivity methodology.
Simplified Modeling Research of Reinforced Concrete Based on the Dynamic Stiffness Equivalence
Authors: Hu Jie , Feng Jia Quan , Zhang Xi Nong
Published: February 2012

This paper proposed a simplified modeling method of reinforced concrete based on the equivalence of dynamic stiffness, the parameters of simplified model were modified to make the error of nature frequency between reference model and simplified model as small as possible, and an appropriate optimization function was designed. The essentiality of the proposed method is parameter optimization, with the advantages such as fewer elements and calculation assumption. The numerical simulation result indicated that this optimization method is suitable for the dynamic response analysis of complicated reinforced concrete structure.
Axisymmetric Punching Capacity Analysis for Concrete Slabs
Authors: Hu Xiao Rong , Fan Xiao Mei
Published: February 2012

The axisymmetric punching analysis for concrete slabs is researched with the triple-shear unified failure criterion, which can explain the failure properties rationally for concrete under the three dimensional stress states, especially the failure properties of the intermediate principal stress effects. Moreover, a new intermediate principal stress parameter is proposed to interpret the different stress states in failure zones for different concrete. It is shown that the coefficients of b and m, which interprets the effects and the magnitudes of the intermediate principal stress have significant impacts on the axisymmetric punching capacity of concrete slabs. For a given thickness of the concrete slabs, the bearing capacity increases with the b and reaches its maximum value approximately when m=1. Using the Mohr-Coulomb failure criterion to analyze the problem of axisymmetric punching of concrete slabs often underestimate the actual ultimate punching capacity significantly.
Split Rigidity Method for Analysis of Double-Layer Space Grids Structure with Rectangular Shape
Authors: Liu Wen Yang , Zhang Wen Fu
Published: February 2012

In this paper double-layer space grids structure with rectangular shape is assumed as equivalent sandwich plate, and has been analyzed by the non-traditional theory of plate with three generalized displacements, in which shearing deformation is considered. Based upon the split rigidity method, static analysis and natural vibration analysis of double-layer space grids structure has been studied. The formulas for calculating internal forces, displacement as well as fundamental frequency are given out. The comparison with finite element method and equivalent sandwich plate method shows that split rigidity method is not only simpler than other simplified methods but also of high accuracy.
Fracture Mechanism and Ductility Construction of Joints of H-Style Beam-Square Tubular Column
Authors: Huang You Qian , Wang Wan Zhen , Wang Wei Tao , Tong Ke Ting
Published: February 2012

Numerical simulation and fracture analysis were performed on conventional joint of H-style beam-square steel tubular column based on suggested elliptical yield model. The modified coefficient of elliptical fracture model was obtained by equivalently calculating the effects of residual stress and flaws. Using the elliptical fracture model with equivalently calculating the effects of residual stress and disfigurement for evaluation, the parameters of slot holes and horizontal haunch at beam flanges on failure mode of joints of H-style steel beam-square steel tubular column were studied by finite element method. The results indicate that the plastic rotation of joints of H-style beam-square steel tubular column with slot holes and horizontal haunch at beam flanges reach 0.03rad and meet with the requirement of the interim guidelines FEMA, and the loading capacity decrease within 15% compared with that of the conventional joint.
Nonlinear Analysis of Concealed Beam in Out-of-Plane Beam-Wall Joint
Authors: Bai Jie , Bai Guo
Published: February 2012

On the basis of previous experimental research, the nonlinear finite element analysis of the out-of-plane beam-wall joint is made with nonlinear bond-slip constitutive relations between steel and concrete. The force mechanism of concealed beam in the joint is studied in detail, and parametric analysis is carried out for height of concealed beam. Results of experiment and nonlinear analysis proved that: concealed beam is the important guarantee for mechanical behavior of the out-of-plane beam-wall joint. In addition, the torsional capacity and height of concealed beam are the main factors influencing on moment transfer behavior of the joint.
Experiment Study and Process Parameters Analysis on Turbo Air Classifier for Talc Powder
Authors: Yu Yuan , Liu Jia Xiang , Gao Li Ping
Published: February 2012

Talc powder is widely used in building engineering, especially preparation for coating, waterproof material and ceramics. With increasing demands for building material quality, the requirement for the particle fineness and particle-size distribution of talc power becomes higher than ever. A new method of process parameters analysis on turbo air classifier for talc powder is put forward in this paper. The effect of the two process parameters on a classification performance index is reflected visually through the 3-D drawing based on Matlab, so the one-dimensional process parameter analysis method is expanded to the two-dimensional process parameters analysis method. In the present study, a turbo air classifier is used as the classification system and fine talc powder is used as materials. The sample data is gathered through setting different process parameters. The experiment results show that process parameters analysis can be implemented quickly and visually. In actual production applications of turbo air classifier system, the user can select the suitable process parameters flexibly considering the production requirements according to the 3-D meshes based on Matlab. This method is also applicable for classification of other powder.
Finite Element Analysis for Unstiffened Overlapped CHS K-Joints Welded in Different Ways
Authors: Wang Xiu Li , Chen Peng , Yang Wen Wei
Published: February 2012

In this paper，the ultimate bearing capacity of unstifened overlapped CHS K-joints is investigated by using the finite element method with influence of weld and non-weld on joint ultimate capacity under brace different bearing capacity. with angle of chord and brace is increasing ultimate capacity to lowed more and more small，which hidden weld is non-weld by one brace is pulled and other is pressured. ultimate capacity no influence to hidden welded and non-welded by both brace is pulled.
Experimental Study of Concrete Early Creep Determination by Using Lying-Tensile Creep Device
Authors: Liu Hong Wei , Ma Long
Published: February 2012

Lying-tensile concrete creep device was designed, and the device was used at the early age of concrete in measuring the tensile elastic modulus, creep and tensile strength. Meanwhile, the using of the device to determine the parameters has been authenticated. Tests show that the usage of the device not only can determine the early age of concrete creep, elastic modulus, but also can maintain constant loads without stabilized device.Study shows that under the same conditions, the ultimate tensile strength of the concrete which were measured creep should be lower than than that of non-creep of concrete . The earlier the loaded age, the greater decreased of ultimate tensile strength, it indicats that the creep of concrete has a certain weakening effect on concrete bearing strength.
An Identification Method for Damping Ratio of In Situ Building
Authors: Zhang Zhi Ying , Sun Qing , Yang Zheng
Published: February 2012

Damping evaluation is of great importance in predicting the dynamic response of systems. To get the accurate damping ratios of a system, many identification methods have been proposed and developed. But only few of them achieved accurate results for in-situ buildings due to the fact that the responses are significantly influenced by noise. This paper proposes a new method to accurately identify the damping ratios of in-situ buildings. The method is based on ambient excitation technique which requires no artificial excitation applied to SSI system and to measure output-only. The damping ratio identification is then performed by combining the improved random decrement method and Ibrahim time domain method. To demonstrate the validity of the proposed approach, a case study is performed and the results are compared with the conventional peak-peaking method results. The results show the proposed method can effectively identify the modal parameter of either frequencies or damping ratios of in-situ buildings subjected to ambient excitation.
On Buckling Loads of Timoshenko Columns with Elastically Supported Ends
Authors: Zhang Hua , Li Xiang Fang
Published: February 2012

The stability of Timoshenko columns with elastically supported ends under axially compressive force is analyzed. Characteristic equations are obtained according to an intermediate state between Haringx’s and Engesser’s models. For clamped-free, clamped-clamped, and pinned-pinned columns, buckling loads are given in closed form. The influences of elastic restraint stiffness on the critical loads are elucidated. Haringx’s and Engesser’s models are two extreme cases of the present. Critical buckling loads using Haringx’s model are upper bound, and those using Engesser’s model are lower bound.
Change Properties of Water Conductivity Height in Coal Roof Induced by Mining in Extra Thick Coal Seams under Influence of Complex Fissures Zone
Authors: Sun Shi Guo , Li Guo Hong , Wang Jing Xin , Zhao Hong Ying , Feng Shao Jie
Published: February 2012

It’s a technical problem of underground mining safety to determine the water conductivity height in coal roof induced by mining under the condition of fully mechanized caving. With a number of mining engineering cases, we studied complex fault zone overlying rock mass damage characteristics under the compound effect of many mining area. The results show that overlying strata deformation and failure is the results of accumulation in mining of each mining area. Therefore, whether the overlying strata water inrush in mining process will happen or not, needs to take account of water in overlying strata in old mining area. Based on the change characteristics of water conductivity height induced by mining in seven mining areas, we built regression forecasting model, and achieved the prediction of water conductivity height induced by mining in lower coal seam, so as to provide a basis for decision-making for the safety of follow-up exploration.
Study on Numerical Analysis of Tunnel Longitudinal Uneven Settlement Base on Elastoplastic Theory
Authors: Wu Shou He , Li Zhong , Chen Si Yang
Published: February 2012

The stratum uneven settlement of tunnel is main factors that cause damage of tunnel longitudinal structure. a 3d numerical model is established for the force and deformation calculation of tunnel structure based on the elastoplastic theory. In the model, soil material is elastoplastic, and its constitutive model is Mohr Coulomb, the element type of soil is a three-dimensional solid, the element type of tunnel lining structure is space shell element, and tunnel settlement joint is three-dimensional linear spring. Calculation shows that, this calculation model is able to fully consider the impact of tunnel uneven settlement in all factors, and can simulate the vertical force and deformation behavior of tunnel structure in complex ground formation conditions. Research conclusion gives the vertical force and deformation of the tunnel structure under the condition of the stratum uneven settlement. It is very important reference for the longitudinal design and calculation of the tunnel lining structure.
Simplified Calculation Method of Optimal Centre Line of the Arch
Authors: Liu Shu Zhi
Published: February 2012

Studied the arch structure under vertical loads reasonable arch axis problem, regardless of the arch on the role of distributed load or concentrated load, the structure can be simplified into line arch, ignoring axial deformation of bars, the moments at the joints must be equal to zero, the ratio of rise to span for the parameters, derived function of the coordinates of each node to determine the arch of the pressure line, and also determine the horizontal thrusts of the arch. The method is simple and practical, especially for the preliminary design stage, for the arch axis provides the basis for further optimization.
Nonlinear Stability Analysis of Cylindrical Double-Deck Reticulated Shallow Shells under Wind Load
Authors: Xu Jia Chu , Li Yong , Ou Chao Yi
Published: February 2012

Based on the nonlinear bending theory of double-deck reticulated shallow shells, the nonlinear buckling problem of cylindrical double-deck reticulated shallow shells under wind pressure is studied. An analytic solution for simply supported edges is obtained by using Galerkin’s method. The results of numerical calculations are presented in diagram and table, which show the influence of geometrical parameters on the buckling behavior.
Numerical Simulation of Effect of Fracture Distribution on Failure Mechanism of Tunnel
Authors: Hwang Ryong Hyon , Yang Tian Hong , Yu Qing Lei , Wang Pei Tao
Published: February 2012

In order to study the effect of rock fracture distributions on stability of tunnel, the effect of joints with different strike dip, the size and density was considered by using probability and statistics method. Based on the Monte Carlo random simulation, the statistical network model of 2D jointed rockmass was established to describe and characterize jointed rock mass. On the basis of this, the numerical code RFPA2D is employed to analyze effect of fracture dip angle on the tunnel stability. Numerical results show that the fracture distribution has a little effect on tunnels failure mechanism and failure type of tunnel because the failure of tunnel in the jointed rockmass is similar to the one without joints and fissures. However with the change of the fracture dip angle, the loading capacity of the tunnel in the jointed rockmass varies accordingly.
Experimental Study on Normal-Section Bearing Capacity of Steel Reinforced High-Strength Concrete L-Shape Short Pier Shear Wall
Authors: Su Yi Sheng , Quan Jin Yun , Cai Min , Zheng Shu Fang , Wu Yi Lu
Published: February 2012

Based on the experimental study of normal-section bearing capacity of four steel reinforced high-strength concrete (SRHC) L-shape short pier shear walls with two-way eccentric compressive load, this thesis discussed the failure pattern and working mechanism and get some general laws about normal-section baring capacity of this kind of specimens. The research results show that: the failure pattern of SRHC L-shape short pier shear wall with two-way eccentric compressive load is classified into two types-large eccentric compression and small eccentric compression; the sectional strain basically fit the plane-section assumption; steel and concrete can practically work cooperatively until the specimens are damaged and the steel of compressive region yielded; the normal section baring properties of the perforated frame member and the trussed frame member were fairly close to each other and the trussed frame has no advantage compared with the perforated one.
Nonlinear Finite Element Analysis for Compressive Capacity of Interior Constrained Square Concrete-Filled Steel Tube Column
Authors: Zhou Qi Shi , Xu Yin , Yu Zhi Wu
Published: February 2012

Nonlinear finite element model is established for the square interior constrained concrete filled steel tube column based on the research of the element type and material constitutive relation with finite element software ANSYS to find out the influence of the thickness of the steel tube, location of studs and geometry of the stirrups on the compression capacity of the short column, The results show that the compression capacity of the short column has something to do with the thickness of the steel tube and the studs, but the stirrups can eventually enhance a lot for the compression capacity as the validity is confirmed for the coherence of the results stepped from the finite element model and in test.
Damage Assessment of RC Frame Structures under Multi-Earthquake Sequences
Authors: Huang Wei , Qian Jiang , Zhuang Bin Bin , Fu Qiu Shi
Published: February 2012

This paper presents the results of a numerical investigation aimed at evaluation of damage accumulation in structures under different seismic sequences. For this purpose, a multi-story RC frame model representing the typical buildings was built and subjected to four sets of different repeating seismic sequences with different magnitude. The results indicate that the aftershock sequences will increase the damage accumulation in structures, and the damage index based on the Park and Ang model can qualitatively and quantitatively ascertain the damage state of the structure instead of the single index based on the lateral drift demands. Additionally, different sequences with the identical energy input will cause the same damage state in structures.
A Model for Predicting the Carbonation Depth of SCC with Massive Fly Ash in the Loading State
Authors: Luo Su Rong , Huang Li Pin
Published: February 2012

In this work, four series of SCC specimens which cement replacement ratio by fly ash was 30, 40, 50, and 60% , respectively, and one series of normal concrete comparative specimens were designed. For the same series specimens, the fly ash addition was fixed, but the loading value was 0.0, 0.2, 0.4, and 0.6 times of the 28 d concrete flexural strength, respectively. Using accelerated carbonation test, the effects of fly ash additions, tensile stress rates, and compressive stress rates on carbonation rate of SCC are studied. Based on the test results, a model considered both effects of fly ash addition and stress rate for predicting the carbonation depth of SCC under real environment conditions is set up. These results can provide a reference for carbonation resistance design of SCC.
Joint Construction of Assembled Integrally Floor
Authors: Li Qing Ning , Huang Huang , Jiang Wei Shan
Published: February 2012

This article expounds the floor ends and sides joint constructions of prestressed concrete floor and prestressed concrete hollow floor with added surface，as well as prestressed concrete hollow floor without added surface，and the comparation are available。Finally，some new construction methods are raised based on improving the seismic performance of integrally assembled prestressed concrete floor。
Determination of Fatigue Load for Light Rail Support of Caiyuanba Yangtze Bridge in Chongqing
Authors: Wu Zu Lie , Jing Sheng , Liu Jun Mei
Published: February 2012

In this paper, in combination with the specific conditions of light rail traffic volume, fatigue load spectrum parameters of light rail support are to be determined by background project light rail line 3 of Chongqing Caiyuanba Yangtze Bridge, through which the internal force history is then calculated. Three million constant amplitude fatigue loads that the test needs are finally determined through linear fatigue damage cumulative theory.
Creep Properties of ASTM A992 Steel at Elevated Temperatures
Authors: Morovat Mohammed Ali , Lee Jin Woo , Engelhardt Michael D. , Taleff Eric M. , Helwig Todd A. , Segrest Victoria A.
Published: February 2012

In moving towards an engineered performance-based approach to structural fire safety, a sound knowledge of the elevated-temperature properties of structural steel is crucial. Of all mechanical properties of structural steel at elevated temperatures, material creep is particularly important. Under fire conditions, behavior of steel members and structures can be highly time-dependent. As a result, understanding the time-dependent mechanical properties of structural steel at high temperatures becomes essential. This paper presents preliminary results of a comprehensive on-going research project aimed at characterizing the material creep behavior of ASTM A992 steel at elevated temperatures. Such creep properties are presented in the form of strain-time curves for materials from the web and the flanges of a W4×13 wide flange section and from the web of a W30×99 section. The test results are then compared against material creep models for structural steel developed by Harmathy, and by Fields and Fields to evaluate the predictions of these models. The preliminary results clearly indicate that material creep is significant within the time, temperature, and stress regimes expected in a builing fire. The results also demonstrate the need for a more reliable creep model for steel for strcutural-fire engineering analysis.
Nonlinear Analysis of Full-Scale Beam-Column Joints of RC Frames
Authors: Guo Er Wei , Li Zhen Bao , Ma Hua , Zhou Hong Yu , Du Xiu Li , Luo Guo Hui
Published: February 2012

In order to research on seismic performance of full-scale beam-column joints of RC frames under low cyclic loading, finite element software ABAQUS is used to nonlinear analysis. Analysis results show that: the process of load carrying and fracture development of beam-column joints are simulated using concrete damage plasticity model; nonlinear finite element method is easy to obtain stress-strain relationship; and can effective analyses the complex mechanical behavior of core areas of joints.
Cracking and Temperature Control in Mass Concrete Construction
Authors: Xu Zhong Qing , Ding Yong Gang , Zhai Chang Yi , Li Qiang Jun
Published: February 2012

With the development of economy, the area of construction grows fast, the use of mass concrete basic of the high-rise and large building also becomes normal. So the cracking control of mass concrete has become an important topic nowadays. In this paper, the mechanism of the cracking and the methods to control the cracking will be studied. And then the stress and temperature field of the basic platform of the national stadium in the mass concrete curing period will be studied by infinite element method. After that, results of the infinite element method will be compared with the results of monitoring. At last, we can come to a conclusion that the cracking of the mass concrete can be controlled in reasonable limits by some measures.
Experimental Study on Axial Compression Performance of Full-Scale Square Columns of Reinforced Concrete Confined by High-Strength Reinforcement Hoops
Authors: Li Zhen Bao , Wang Wen Jing , Zhang Wei Jing , Shao Yun Da , Zhang Bing , Fan Mei Guang , Lin Shuang Ping
Published: February 2012

Axial compression experiments of four full-scale reinforced concrete columns of two groups were carried out. One group of three columns used high-strength steel with the yield strength of 1000MPa as reinforcement hoops, and the second group used the ordinary-strength steel with yield strength of 400MPa. The axial compressive performances between these two groups were assessed. Compared to the specimen using the ordinary-strength steel, the axial compressive bearing capacity of using the high strength steel dose not increase significantly, while the deformation ability increases greatly. The results also indicate that the stress redistributions of the hoops and the concrete sections are obvious, and long-lasting when specimens achieve the ultimate bearing capacity after the yield of the rebar and local damage of concrete materials, at this time the strain of the specimens developes a lot, especially stress - strain curves of speciments with high-strength hoop all show a wide and flat top.
Urban Design Strategies of Public Space Based on Danger Stress Response
Authors: He Le Xia , Xu Su Ning
Published: February 2012

Facing the increasingly severe situation of city security issues, researches on urban planning and design have gradually expanded. However, problems in connection with people are not taken seriously. Regardless of disaster type, human beings, as one group of the disaster receptors, produce a similar psychological and physiological response to threats. Therefore, disaster prevention and mitigation should be people-oriented. Based on danger stress response, this paper analyses types and characteristics of thinking and behavior in disasters or emergencies and reflects the significance of people-oriented urban safety design. In addition, this paper takes public space, which plays an important role in urban security as the main subject and proposes urban design strategies on appeasing negative psychological and behavioral stress response, attempts to provide a scientific basis for effective disaster prevention strategies in order to minimize the hazards to humans caused by physical and psychological impact.
Planning and Design Strategies of Open Spaces at the Bottom of High Rise Buildings Based on Environment Comfort in Winter Cities
Authors: Leng Hong , Yuan Qing
Published: February 2012

With the accelerated process of urbanization in China, the high-rise buildings are springing, which makes a large number of open spaces located at the bottom of high-rise buildings. By conducting field research and observation to some areas with high-rise buildings in winter cities, the paper not only summarizes the problems existing in open space environment at the bottom of high-rise buildings, but also proposes the planning and design strategies based on the comfort of environment including well organizing wind environment, creating comfortable sunshine environment, reducing environmental pollution and forming different functional spaces.
Urban Spatial System Planning of Disaster Prevention and Refuge
Authors: Wu Yi Zhou
Published: February 2012

The current urban planning is focused on the economic development, and weakens the basic guarantee for security and crisis prevention function. Taking the case of Taiwan where earthquake happens frequently, the paper introduced its theory and framework of urban planning of disaster prevention and refuge. By analyzing the example of Yuanlin town, this paper selectively introduced some typical planning measures and solutions in order to provide references to urban spatial system planning of disaster prevention and refuge in China.
To See Shanxi’s Specialized Urbanization Development from the Perspective of a Rustic Village’s Transformation - Take Huangcheng Village, Shanxi Province as an Example
Authors: He Yi , Kong Wei Jie
Published: February 2012

Shanxi is a famous province that is rich in coal in China. The Special geographic condition has left a plenty of cultural heritages. In face of China's urbanization strategy, this thesis takes a rustic village’s transformation process as a microcosm to see specialized urbanization in Shanxi province.
Research for Renewal Countermeasure of the Historic Block of Qiqihar Catholic Church under Market Economy
Authors: Guo Rong , Huang Meng Shi
Published: February 2012

Since the 1990s, Economic system of China altered from the planned economy to market economy. This brought opportunity and challenges to the renewal and transformation of the historic blocks. With the economic developing, those historic blocks are constantly renewing. But the conflicts highlight increasingly between economic benefit and the protection. This paper analyzed the relationship between the economic benefit and the protection of the historic block of Qiqihar Catholic Church updating. Starting with create a commercial public space, proposed the renewal countermeasure of the historic block of Qiqihar Catholic Church from functional complex, traffic Organization, Space shape and Landscape design. Tried to solve the contradiction between the economic benefit and the old block protection, develop the economic benefit, social benefit and the environment benefit hormonally.
Yunnan Baima Snow Mountain Nature Reserve Ecological Planning Based on the Regional Ecological Risk Assessment
Authors: Li Hui , Liu Da Bang , Wang Si Qi , Yao Wen Jing , Yang Xiao , Meng Fan Tao , Zhang Men Xiao , Li Guo Yan
Published: February 2012

One of the world natural heritage Three Parallel Rivers core region Yunnan Baima snow mountain national nature reserve as the study area, on the basis of full consideration natural and social factors of reserve, we have established the ecology risk evaluation index system and model in the study area, and has put forward type alpine canyon regional ecological risk assessment of the theory and technical route. We have evaluated risk of the area, and obtained distribution of the risk degrees, and replenished alpine canyon type area demonstration for regional ecological risk assessment. Based on the ecological risk assessment, we put forward the ecological planning in the study area.
Recreating the Traditional Waterfront Living Space - A Study on the Design Mode of Livable Space under the Concept of Low-Carbon Development
Authors: Chen Yi , Shen Shi Yan
Published: February 2012

This article takes traditional waterfront living space as the object of study, analyzes configuration features of such space, learns from design experience at home and abroad, explores the design mode of such space suitable for modern society and finally illustrates the mode by relevant examples. This study has an important significance in both theoretical research and practical applications in the design of livable space under the concept of low-carbon development.
Evaluation for Climates Adaptive Capability of Traditional Tuzhang Dwelling
Authors: Zhang Tao , Liu Jia Ping , Wang Jun , Zhang Qi Wei
Published: February 2012

Present study is concentrated on evaluating the climate adaptive capability of Tuzhang dwellings. The comparisons to different thermal physical properties such as thermal resistance R0, thermal inertia index data D, reduction coefficient of thermal wave transferring V0 and thermal transferring delaying time ξ0 have been performed between Tuzhang dwelling and normal brick house. Comparing results show that Tuzhang dwelling has much better thermal properties than normal brick house. Therefore, regarding to climate adaptive capability, traditional Tuzhang dwelling is vastly superior to brick house.
Construction of Corporate Governance Mechanisms Based on Coordinated Management
Authors: Guo Feng , Liu Hui
Published: February 2012

Nowadays, the domestic corporate governance mechanisms are not matching their structure, which seriously restricts the increase of enterprise efficiency. This paper, in the view of coordinated management ,analyzed the interrelationship between coordinated management and corporate governance. By constructing the optimal utility model of the behavior choice of enterprise operator, this issue showed that corporations should build reasonable supervision &incentive mechanisms to regulate operators’ actions, in order to enhance enterprise efficiency and realize the coordinated management .According to the analysis on the equilibrium solution of the model, this paper constructed the corporate governance mechanisms based on coordinated management.
Study on the Treatment and Application of Urban Street Rainwater based on the Landscape Basin of Double Subsurface Constructed Wetland
Authors: Xue Bin Xia , Xu Han , Kang Xiao Fei
Published: February 2012

Rainwater is a kind of natural resource and how to treat and utilize effectively has been the tough problem in urban rainwater recycling. In this paper based on the characteristics of street rainwater, a kind of rainwater treatment system is put forward aiming at the rainfall features in northern China. Firstly the collected rainwater will be filtered to remove the organic pollutants with macromolecules and then is discharged into the landscape pond. To deal with the seasonal change of rainwater in winter cities, the variable treatment methods of double subsurface constructed system are applied to achieve the continuous operation.
The Regression Analysis of Corresponding Crack in Asphalt Pavement under Temperature Load
Authors: Yuan Song , Tan Zhi Ming
Published: February 2012

By use of the theory of fracture mechanics, the plain-strain model is established to simulate the four-layer asphalt pavement of corresponding crack.. And then, applying the segmented integral method and power function form, the stretching stress intensify factors in the conditions that four limited layer combined status and different crack space are calculated and analyzed under the action of pavement and basement shrinkage. Moreover, the regression formulas are given which can meet requirements of the engineering regression equation precision.
Analysis of Human Care of Green Ecology in Campus Planning Design
Authors: Bai Xue , Yao Chuan Qin
Published: February 2012

With the summary and analysis of the idea, connotation and meaning of green campus ecological planning, this paper demonstrates the specific practice and important meaning of human care in campus planning design, and makes a positive exploration of green human campus in the sustainable development of Chinese building.
Design and Thermal Performance Test of Compound Wallboard of Rural Energy-Saving Residence in Cold Regions
Authors: Hao Jin Feng , Liu Chuan Ming , Zhang Fang , Liu Gui De
Published: February 2012

Design a kind of suitable village residence constructs of the economy energy prepare to make wall plank, the wall's plank has heat preservation economy energy and accepts heavy dual function, can satisfy accepting of two-story building heavy, and the hot work according to economy energy residence request, the wall's plank can act for a village use to glue soil brick. Pass sample product engineering the fulfillment carried on an engineering application, proving should be prepared to make wall plank to have good economy energy effect.
Analysis on the Effect of Shape Coefficient to Energy Saving in Residential Buildings
Authors: Feng Xiao Ping , Lin Hui , Wang Yue , Cheng Hu
Published: February 2012

Building shape coefficient is an important factor in building energy saving design. In order to analyze the influence of shape coefficient to the energy consumption, a typical residential building is simulated by BECS software to analyze the changing regular patterns of the energy consumption for heating and air conditioning while the building shape coefficient is made different. The relationship between building height and shape coefficient, and the impact of the building plane layout on the energy consumption are also analyzed. The results show that the reduction of shape coefficient is benefit to enhance the effect of energy saving.
Seismic Analysis of Non-Proportionate Eccentric Buildings
Authors: Georgoussis George
Published: February 2012

A simple procedure is presented for estimating frequencies and the peak values of base resultant forces of eccentric non-proportionate buildings due to earthquake ground motions. Multi-story buildings composed by a number of bents with different stiffness matrices do not belong to the special class of proportionate buildings, which can be analyzed by a simple methodology developed in the past. This paper extends this methodology to all types of medium height buildings and is shown that their maximum response can be derived from the analysis of two single-story modal systems. The accuracy of the proposed method is illustrated in mixed-bent-type example structures and comparisons are made with the accurate results obtained by response spectrum analyses using the SAP2000 computer program.
Effect of Aggregate Shape on the Chloride Diffusivity of Concrete
Authors: Zhou Xin Zhu , Zheng Jian Jun , Liang Yun Ying
Published: February 2012

The effect of aggregate shape on the chloride diffusivity of concrete is studied. To represent the heterogeneity of concrete, a three-phase composite ellipse model is constructed and the relative dimensions are determined by calculating the area fraction of interfacial transition zone in a numerical manner. The height of each bar in the lattice mesh is derived analytically. The lattice method is then used to estimate the chloride diffusivity of concrete. After the validity of the numerical method is verified with experimental results, the effect of aggregate shape on the chloride diffusivity of concrete is evaluated in a quantitative manner.
Preparation and Properties of a Novel Nonflammable Thermal Insulation Material
Authors: Shi Dan , Shi Ling , Zhang Jun Ying , Cheng Jue
Published: February 2012

A novel nonflammable thermal insulation material for buildings was prepared by foaming sodium silicate solution with blowing agent. The material density is 274 kg/m3,with the compressive strength up to 2.0MPa and the coefficient of heat conductivity low to 0.08 W/ m•K.
A New Wet-Type Dust Removal and Desulfuration Equipment and its Application in the Ceramic Industries
Authors: Huang Zhi Cheng
Published: February 2012

A new wet-type dust removal and desulfuration equipment can be used in ceramic industry for spray drying tower. It adopts four ways and seven grades remove dust. A pair of tubes are erected inside and outside its structure; it has self- clean system, and it can keep the ability of dust removal for a long time. Practice has proved that this equipment has the advantages of low cost, easy maintenance, high efficiency and can be secondary desulfurization, it has great practical significance.
Shaping the Vitality of the National List Historic Culture Town Based on the Theory of Urban Catalysts
Authors: Zhao Zhi Qing , Wang Qing Lian
Published: February 2012

This paper, based on the theory and methods of urban design, analyzes the effects of stimulating and driving the space vitality from economic, social and cultural aspects. It is trying to find out main problematic issues of the protection planning of Chinese Eastern Railway Culture Town and to explore the methods of shaping vitality of historic culture town. In addition, it also produces an empirical research taking the town of Hengdaohezi as the case study.
Effect of Gypsum-Contaminated Aggregate on Long Term Properties of Mortar
Authors: Li Bei Xing , Ke Da , Song Ji Hong , Fu Ke Jian
Published: February 2012

Contamination of aggregates with gypsum occurs frequently. Fine aggregate has more detrimental effect due to its large surface area. An experimental work had carried out to investigate the behavior of mortar made from six SO3 contents in the fine aggregate, five size fractions of gypseous aggregate and three C¬3A contents in the cement. The results show that significant expansions do not occur within mortar bars if the content of SO3 lies below 1.25% by the weight of fine aggregate and the reduction in strength is higher in later ages and for higher SO3 contents. The size fraction of gypseous aggregate also affects the degree of expansion, especially in the case of fine particles. The cement with C3A content lower than 5% can tolerate a higher level of contaminant gypsum.