bluuebunny/crossref_metadata_2025 huggingface dataset:
Experiment Design of the Defrosting Control Method of the Variable Refrigerant Flow Air Source Heat Pump
Authors: Han Xing , Chen Jian Bo
Published: October 2011

This paper first analyze the common air source heat pump defrosting control methods and their problems. Then, the impact of variable refrigerant flow technique on the air source heat pump frosting and defrosting is analyzed. Through experiment design, the influencing factors on inverter air source heat pump defrosting control methods will be studied.
Experiment Study on Temperature Susceptibility of Cold Recycled Mix with Foamed Bitumen
Authors: Xu Jin Zhi , Hao Pei Wen
Published: October 2011

By using indirect tensile strength test and compression modulus test, the influences of variables, including recycled asphalt pavement (RAP) content and foamed bitumen content, on temperature susceptibility of mechanical properties of cold recycled mix with foamed bitumen (CRMFB) were studied. The results indicated that increase of RAP content had little impact on temperature susceptibility of CRMFB when small quantity of RAP (less than 70%) were contained, while enhanced temperature susceptibility of CRMFB was brought about when a large quantity of RAP (more than 70%) were contained. The mechanical properties, including strength and stiffness, manifested enhanced temperature susceptibility with the increase of foamed bitumen contents. Compared with HMA, CRMFB was obviously less susceptive to temperature.
Structural Design of Shenzhen Stock Exchange Plaza
Authors: Wang Qi Wen , Zhou Bin , Niu Dun Sheng
Published: October 2011

Shenzhen Stock Exchange (SSE) plaza, being constructed in Shenzhen of China, is a complex high-rise building with a raised podium above ground level. The podium extends outwards from the tower structure at a maximum cantilever span of 36 meters. The lifted podium is a new concept conceived by architects but a big challenge confronting structural engineers. In this paper, the structural systems, including tower lateral resisting system, podium supporting system, floor system and foundation, are introduced. In order to evaluate the structural performance under the action of three earthquake levels specified by Chinese code, three models using MIDAS, ETABS and ABAQUS have been built; the results from the three software presented. It has been shown that the performance targets of all three design earthquake levels can be attained
Analysis of the Effect of Super-Structure’s Stiffness on Foundation’s Uneven Settlement
Authors: Chen Da Chuan , Liu Ri Xin , Li Deng Ke
Published: October 2011

The bottom-frame structure is a kind of small bay masonry structure building with large bay RC frame in bottom[1], it is widely exists near streets in China because of the economy and applicability. But for the poor correspondence capacity for foundation’s deformation, it is easily be damaged for this kind of building in uneven settlement. It can provides theoretical support for design and strengthening works of such kind of structure buildings by analyzing the relation between superstructure’s stiffness and settlement of foundations, which has practical significance. For the complexity of stress of the composite structure, ANSYS is used in this analysis. A strengthening project based on this theory is introduced in the end, it validates the feasibility of the conclusion.
The Enlightenment of Space Layout of Dali Bai Local-Style Dwelling Houses Building for the New Rural Construction Layout
Authors: Tian Huan Huan , Hu Wei Ping , Yao Gui Yang
Published: October 2011

Abstract. Dali boasts brilliant local culture and ethnic folk customs.Dali culture is a fusion of cultures such as the central plain, Tibetan culture, southeast Asia culture and the local ethnic culture ; is also a long history of brilliant ancient culture in China's southwestern minority region;and is an important part of Chinese culture.This article through analysis of space layout of Dali Bai local-style dwelling houses building to idendity the rationality and possibility of combining it with local new rural construction.
AA-MMA Prepolymer Grafted LLDPE as Compatibilizer for Starch-PE Blends
Authors: Tai Li Min
Published: October 2011

Through the graft copolymerization of LLDPE and the AA-MMA prepolymer by reactive extrusion on the single-screw extruder, the LLPE-g-AA-MMA was prepared and used as compatibilizer for starch/PE blends, and then the compatibilization effect was investigated. The results exhibited that the addition of this compatibilizer substantially improved the mechanical properties, especially the tensile strength. Scanning electron micrographs of the blend specimens also supported the above observations.
Study on Shear Capacity of Cold-Formed Thin-Walled Steel Composite Walls with Openings
Authors: Li Yuan Qi , Yang Jing Kai
Published: October 2011

This paper gives a simple introduction of the development and structural behaviors of cold-formed thin-walled steel structure under shear loads. An overview of existing research on shear performance of cold-formed thin-walled steel composite walls with openings is given. This paper summarizes and arranges the data of such experiments on composite walls with openings. Finally, with the use of SPSS (Statistical Product and Service Solutions) software, this paper makes a regression analysis, and gets an equation of reduction ratio considering openings.
Strength Prediction of Fly Ash Concrete Using Cementing Efficiency by Statistical Analysis
Authors: Cho Hong Bum , Jee Nam Yong , Shin Jun Ho
Published: October 2011

This paper offers a model that can estimate the 28-day compressive strength of concrete containing fly ash (FA) using the concept of cementing efficiency. Using various statistical analyses, the prediction model was derived from a wide range of mix proportions and a number of strength test results of concretes used in eight construction sites. A strength prediction model was proposed in terms of a function of the modified cement-water ratio reflecting the equations for cementing efficiency. This prediction model that has R2 of 0.88 and root mean squared error (RMSE) of 1.6MPa is capable of properly predicting the 28-day compressive strength within strength variation of FA concrete.
Application of Green Construction Techniques in Public Buildings: A Case of the Medicine Building in Nanjing Pukou Central Hospital
Authors: Zhang Shen Ju , Li Jian , Wang Xin Gang
Published: October 2011

The green building is one important way to develop the energy conservation work. The green construction technology surmounts in the tradition building technology, paying great attention to energy conservation, low consumption and high efficient and environmental protection. The green construction technology is the sustainable construction method. This paper takes the medicine building in Nanjing Pukou Central hospital as an example to analyze the characteristics of the green construction techniques and study the application of the techniques in public buildings.
Concrete Mix Design Incorporating Additional Consideration of Environmental Performance
Authors: Li Zhu Guo , Ohkubo Takaaki
Published: October 2011

In this paper, we gave a clear concept of environmental performance (EP), and proposed an estimating method of environmental performance indicator (EPI) for concrete, based on an integrated life cycle impact assessment. The environmental burden (EB) factors of concrete were also discussed. In order to well evaluate the environmental benefits of waste utilization, land use change and nature environmental resource loss caused in the production stage of concrete were also taken as the EB factors and their estimating methods were given, besides air emissions, waterborne releases, and exhaustible resource consumption. Furthermore, An EB intensity database was constructed for concrete’s raw materials and processes such as transportation. An environment-conscious mix design method was suggested for maximizing EP of concrete, while still meeting the usual property requirements such as consistency, strength and durability. Finally, as an application example, mix proportions of a retaining wall concrete were designed.
Regression Model for Resilient Modulus of Subgrade Soils in Shanghai
Authors: Liu Hong Xi , Zhou Liang
Published: October 2011

Subgrade resilient modulus (MR) is very important for effective design of pavements. Several methods to estimate the resilient modulus were suggested in the past years. The main objective of this paper was to validate the correlation of MR with other physical properties of the subgrade soils. Cohesive soils representing major soil types in Shanghai were selected. The resilient modulus tests were conducted with UTM. Additional analysis was then performed to develop correlations between the model parameters and other soil properties. To verify the prediction models independently, laboratory MR tests were conducted on new subgrade soils. It was observed that the predicted MR values compared well with the laboratory measured values for the soil samples.
Ostwald Growth of Carbides in Cyclic Annealing Process of GCr15 Bearing Steel
Authors: Yang Hong Bo , Wang Yao Mian , Luo Lei , Zhang Ping Ping
Published: October 2011

The spheroidization of the carbide of hot-deformed GCr15 bearing steel was investigated in cyclic annealing process. The results show that most of carbide particles become gradually smaller and more dispersed with the increase of process cycle, however, part of them start to grow for the four cycles, the growth agrees well with Ostwald Ripening Law, and it is not suitable for the further process.
Testing and Evaluation on Fractal Characteristic of Cementing Materials Powder
Authors: Chen Ning , Tang Ming , Li Jing Qi , Liu Hong Liang
Published: October 2011

The cement powder materials are evaluated by fractal theory. Fractal characteristic parameters are analysed and evaluated by the method of laser particle size analyzer, microscope, transmission electron microscope. In this paper, cement powder materials has good self-similarity. Fractal dimension of grading is tested and evaluated by laser particle size analyzer, fractal dimension of cluster is tested by microscope, fractal characteristic of particle distribution is tested by transmission electron microscope. Compared with traditional weight of screen residue and specific surface area, those methods are more careful. Fineness fractal parameters and activity of ultra fine fly ash and pulverized slag have good linear dependence relation that is evaluated by fractal dimensions. Fractal characteristics provide an important basis to further explore the inherent relation of cement powder materials and concrete material density effect.
Finite Deformation Stiffness of Sliding Elastomeric Bearings
Authors: Xiao Jian Chun , Liu Peng , Ma Ke Jian
Published: October 2011

Anchor bolts are set in some elastomeric bearings of large-span column-supported spatial steel roofs. Besides helping the bearing in-site assembly, the bolts play the roles of sliding position limitation and vertical anchorage. To analyze the effect of bearings on nonlinear structural behavior, the bearing stiffness change is studied just before and after the elastomer pad is in contact with the bolts. For the bearing that the pad is glued with the top/bottom steel plates, three kinds of relation of pad and bolts are discussed and an approximate horizontal stiffness formula is obtained with parametric analysis method. Based on the analysis results a stiffness expression for sliding elastomeric bearings is deduced. To solve the computational problem caused by the bearing stiffness changes, an improved imbalance force vector formula is proposed. Case study shows that the bolts have influence upon the computed results more significantly.
Calculation and Analysis of Loss Factor of Building Materials
Authors: Huang Xian Feng , Liu Jun , Yang Yan
Published: October 2011

In order to describe the damping characteristics of building materials and members, the formula for calculating loss factor which concerns with the internal loss factor and edge losses was derived from the concise physical relationship and, calculations of loss factor of some common building materials and members are presented. Therefore, the loss factor curves of among the walls which made of different materials are gained. It is shown that at low frequency total loss factor (damping) of a building material gradually decreases with the frequency and is also dependent on the thickness of the wall and its longitudinal wave speed, and at high frequency it tends to a constant.
Numerical Simulation for the Deformation of Composite Wall Insulation System
Authors: Cheng Tao
Published: October 2011

The nonlinear constitutive relations of clay are investigated with different initial stress conditions. Two series of triaxial compression tests are performed, respectively after consolidation and isotropic consolidation. On the basis of the framework of ~ model, a uniform nonlinear constitutive model is proposed by fitting of the test data. With the average slope of the unloading-reloading curve selected as the unloading modulus, the unloading function is constructed as the loading-unloading criterion. Moreover, a comparison of the experimental stress-strain curves with the predicted results by the constitutive model is made. It is shown that the model prediction is reasonable, which can reflect the stress-strain behavior of the soil under the consolidation and isotropic consolidation conditions.
Model Test of Using Vacuum Preloading to Improve Dredge
Authors: Yan Shu Wang , Zhou Qun Hua , Sun Li Qiang
Published: October 2011

Dredge materials with the water content more than 80% have been used for land reclamation in Tianjin, China. The dredge is transferred by pipeline to the reclamation place and then strengthened with the vacuum preloading technique. It has been found that with the thickness of the filled dredge layer becomes larger and larger, the quality of soil improvement is not as good as expected. Field investigation shows that after vacuum preloading the vane test strength can reach 50kPa at the ground surface, but decreases along with depth dramatically. The model test is carried out to detect the factors that may influence the efficiency of using vacuum preloading to improve dredge soil foundation. The water content, vacuum pressure and undrained strength are measured during the test.
Influence and Application of Topological Geometry in Architectural Design
Authors: Li Zai Hui , Chang Qing Hua , Shen Yuan
Published: October 2011

Topology geometry was established in the nineteenth century. It has long been widely used in architectural design. This article makes a brief introduction of topology geometry, discusses the main research objectives and the spatial characteristics in topology, and takes some good cases in architectural design.
Reliability Analysis of the Diesel Engine Crankshaft Based on APDL Language in ANSYS
Authors: Zheng Jian Xiao , Li Bin , Yuan Si Cong
Published: October 2011

The overall three-dimensional parametric model of the crankshaft has been completed based on the ANSYS Parametric Design Language (APDL) from the software of ANSYS and by combing the structure analysis capability with the statistical analysis capability of its PDS module, the reliability analysis of Monte Carlo finite element method (FEM) will be achieved according to the finite element analysis technology and the reliability basic principles. The 4110 diesel engine crankshaft was taken as an example, the parametric design will be introduced into the finite element structure analysis to implement the rapid adjustment of the structure parameter, produce the anatomic model automatically and complete the process of the structural analysis and reliability analysis. The process that the reliability analysis of the crankshaft has been realized will be described in detail. According to the results of probability analysis, the sensitivity relation between the design variable and the object variable will be obtained and at the same time the maximum stress probability distribution function of these dangerous parts and the main affective factor for object variable will be given, which will offer the useful data for the structure reliability optimization design.
Study on Performance of Graduation Rubber Modified Asphalt
Authors: Li Yan Chun , Lv Rui , Zhang Pan , Xu Yu Zhuo , Hou Guo Jing
Published: October 2011

Consider the rubber modified asphalt preparation powder in the process of particle size, the influence factors of 40 yard, and are chosen 60 orders and class size distribution of particle size of mixed powder preparation powder, and puts forward the rubber modified asphalt mixture of different size when range, three kinds of modified asphalt compared the basic indexes and storage stability and permeable performance. Research shows that, the stability of class size distribution of the rubber modified asphalt is better than that of single particle size of the rubber modified asphalt.
Numerical Analysis of the Influence of Vertical Load on the Horizontal Bearing Capacity of Single Pile
Authors: Xiao Zhao Yun , Zhang Guo Xun , Xu Wei , Xue Zhong Ming
Published: October 2011

It is a complicated progress of interaction between pile and soil when pile is under both vertical load and horizontal load. This paper analyzes the variation of stress, strain, deformation and deflection of the pile body by finite element numerical simulation of single bored concrete pile under vertical load together with horizontal load. Based on the existing research results, conclusions could be that the vertical load can increase horizontal bearing capacity of the pile in sandy soils, but horizontal bearing capacity of the pile in clayey soils is more complicated. Hope that the simulation can provide some references for the design of pile foundation.
Influence of Uneven Soft Subsoil on a Brick Building
Authors: Wang Yi Fang
Published: October 2011

According to an evaluation on a six story, brick residential building with severe cracks and inclination, the influence of uneven soft subsoil on building was analyzed. Such damaged wall could be avoid, if the treatment to the basement and subsoil is correct in design and the brickwork is regulated strictly in construction. In order to minimizing the lost and keep the building safety, influence of uneven soft subsoil on buildings should be taken into account much more seriously, not only in design, but also in the construction process.
Study on the Change of Traditional Space in Post-Earthquake
Authors: Liu Hong Tao , Fu Bei
Published: October 2011

Zhaohua is a historic town of Sichuan province in China. On May 12th, 2008, a devastating earthquake measuring 8 on Richter scale struck Wenchuan, Sichuan province. In the process of recovery, 9 damaged historic buildings were demolished, 26 historic buildings were regenerated with new materials and 22 new buildings constructed in historic district. The purpose of this report is to study the space change of historic district during the process of recovery, and then attempt to get some lessons from the change of traditional space. We conclude that the emergency management is necessary for the whole environment of the historic district, in order to preserve the traditional space in post-earthquake. In China, although some principles on the conservation of historic districts were in place prior to the earthquake, during the process of recovery the local government did not forcibly ask the people to restore every historic building with original materials, additionally there were no legal consequences. This led to some historic buildings being restored with new materials or demolished, even historic spaces were changed. In Zhaohua, although a conservation plan was in place, mainly this plan focused on the preservation of traditional space and did not include emergency management on how to control the historic space and what should be done during a disaster and post disaster.
Arched Soil-Cement Walls for Soft Ground Reinforcement of Dike Slope
Authors: Li Shou De , Xu Hui Er , Chen Jian , Li Qin Qin , Tian Zheng Hong , Chen Yong
Published: October 2011

New structure of long straight walls with arched retaining wall was raised to improve the anti-sliding capacity of embankment soft ground. The arched walls embedded in the soft subsoil will transfer lateral forces in reasonable ways. Detailed research shows that the structure of arched walls can greatly increase slope stability and reliability.
Overtopping Risk Analysis Using MC-LHS Method
Authors: Wang Wei , Li Chuan Qi , Wang Shuai
Published: October 2011

Based on the theory of risk analysis, this study develops a LHS –MC method to evaluate dam overtopping probability that accounts for the uncertainties arising from wind speed and peak flood. LHS method is used to generate samples of peak flow rate and wind speed especially for rare events. One example of dam overtopping risk analysis is presented to demonstrate the validity and capability of the proposed method. By means of numerical example, it is shown that LHS method is efficient which tends to convergence within a few simulation times. Reservoir routing, which incorporates operation rules, wind setup, and run-up, is used to evaluate dam overtopping probability.
Evaluation of Earthquake Resistance of Historic Buildings
Authors: Liu Hong Tao , Su Jun
Published: October 2011

Zhaohua is a historic town of Sichuan province in china. On May 12th, 2008, a devastating earthquake measuring 8 on Richter scale struck Wenchuan in Sichuan province. 232 historic buildings in Zhaohua town, the number of totally damaged buildings was 46, the number of partially damaged buildings was 74, and the number of slightly damaged buildings was 112.The purpose of this research is to study the extent of damage to these historic buildings in this earthquake, and then attempt to evaluate the weak points in these historic buildings. Also this research will be beneficial to the reinforcement and prevention of historic buildings. As the result, the damaged situation of historic buildings is related to the building main materials and construction. Relatively buildings made of wood and brick with stood seismic forces more than buildings made of wood and mud, which collapse easily; the connection of the materials construction is the main weak point in the traditional historic building in Sichuan. Therefore, it is necessary to evaluate the weak points in historic buildings, particularly some historic buildings made of mud, which should been reinforced prior to an earthquake.
The Research on Damage and Failture Mechanism of Drivepipe under Seismic Load
Authors: Zhi Xiang Cao , Xue Jia Zhu , Cao Xiu Li
Published: October 2011

Geological factors and engineering factors is a major factor to damage, the drivepipe deformation under pressure seismic load which used to establish mathematical model of the mechanical model can calculated the stress and strain analysis of the casing. The drivepipe damage to this article on the mechanism research on the mechanical model of drivepipe analysis under Seismic load, based on the drivepipe through the focus on the impact and stress damage to the mechanical method of drivepipe deformation studies, and the models of a drivepipe failure mechanism of the mechanical and mathematical are established, which will scientifically, accurately predict the damaged drivepipe.
Finite Element Analysis on Critical Constraint Ratio of All-Steel Buckling Restrained Brace
Authors: Ma Ning , Wu Bin , Ou Jin Ping
Published: October 2011

The bearing capacity of the all-steel BRB consists of a rectangular core plate and a square outer tube is analyzed by finite element method using ABAQUS. The influences of configuration parameters, including the initial eccentricity of the core, the ratio of the width to the thickness of the core, and the ratio of the gap to the width of the core, on the critical constraint ratio are investigated. The fitted equation obtained based on the analysis can be used to guide the design of the BRB.
Attribute Theory-Based Evaluation of Highway Construction Projects for Sustainable Development
Authors: Li Ming Shun , Yang Ke
Published: October 2011

In the background of scientific concept of development and sustainable development, while measuring the sustainability of highway construction projects, we should not only evaluate them in terms of the project objectives, but also make a comprehensive evaluation of its sustainability standing height of sustainable development. This article builds a comprehensive evaluation index system for sustainable development of highway construction projects based on the attribute comprehensive evaluation theory and also studies the dimensionless index of the method and method for determining the index weight, and finally verifies with examples.
The Stability of Elliptic Paraboloid Grid Shell Lighting Roofs with Semi-Rigid Joints
Authors: Feng Ruo Qiang , Yao Bin , Ye Ji Hong
Published: October 2011

Grid shell is a new type of single layer latticed shell. Joint connections of this structrue always adopt semi-rigid joints: in-plane pin joints, out-plane rigid joints. A parametric modeling method using self-designed program is proposed in this paper. Bearing capacity of the elliptic paraboloid grid shell with semi-rigid joints is analyzed. Then, the influence of section of steel bars, rise-span ratio and initial imperfection on the bearing capacity is investigated.
Performance Estimate for Slender Solid Shear Wall under Rare Earthquakes
Authors: Chen Qin
Published: October 2011

An method of calculation the displacement of wall pier in plastic zone under lateral force and axial force is proposed in this paper, which can reflect the failure behavior of wall pier at ultimate state observed from 9 RC slender solid shear wall specimens under reserve cyclic loading, and the contribution of both modes of flexural and shear deformation are considered. The comparison between analytical results and experimental results indicates the effectiveness of the method. By applying the method, performance estimate for shear wall under rare earthquakes can be conducted by engineering designer, dispense with complicated nonlinear analysis.
The Free Vibration of the Magneto-Electro-Elastic Materials Laminated Circular Plate
Authors: Guan Qun
Published: October 2011

In this paper, on the basis of the dynamic equation of material which contains transversely isotropic piezoelectric、piezomagnetic and elastic media, the state variables equation of piezoelectric、piezomagnetic and elastic circular plate in axial symmetric deformation is deduced. Under the given boundary conditions, according to the theorem of Caylay-Hamilton and applying the transfer matrix method, the solutions of state variables equation which are about free vibration of piezoelectric、piezomagnetic and elastic circular plate of single layer and multilayered are obtained. The calculation example indicates that from the varying law of the first natural frequency of the plate depending on the thickness-to-radius radio of the plate under varied conditions, the vibration properties of piezoelectric、piezomagnetic and laminated plate is related to the laminatation order of the material is gotten to know.
The Protection of Chinese Historical Cities in Ethical Perspective: the Construction of the Dignity of Cities
Authors: Qi Jia Hua , Liang Shuang
Published: October 2011

In ethical perspective a city is not only for residence, but also is the carrier of its culture, which is especially true of a famous historical city. In the process of urbanization, most larger and major Chinese cities have not appeared in the world heritage list by UNESCO. In order to change the disconcerting situation, this article focuses on the dignity of the historical city and proposes three measures, after analyzing the basic causes. In conclusion, constructing the dignity of Chinese historical cities is the key to resolve the problems in protection.
The Study on Mechanical Performance of New Composite Steel-Truss Travelling Bridge Structure
Authors: Qiu Hong Sheng , Shi Shu , Huang Xiao Min
Published: October 2011

As for structural beam of travelling bridge under reciprocate loads, at the bearing there will be a large change in stress of structure, while at the ends and midspan, the change of stress of structure will be simple. In this paper, based on the bearing features of travelling bridge structure, as well as features of steel-truss beam and steel box beam, a new composite structure, which is named as steel truss-steel truss box beam, is put forward. This new structure adopts steel box beam with truss inside at the bearings, and adopts steel truss beam at the midspan. Based on a certain engineering project, combined with ANSYS, according to a serious of sizes and structure styles, work of modeling, analysing and optimizing has been done in this paper. As calculating results showed, steel truss-steel truss box beam not only has higher bearing capacity, structural bearing capacity and a better wholeness, but also has a lower steel usage, which can provide references for similar composite structures' research in future.
Particle Breakage of Gypsum Granular Materials in Triaxial Compression Tests
Authors: Zhang Jian Wei , Wang Chen , Zheng Qi Wen
Published: October 2011

In order to study the particle breakage of granular materials during compression, a series of triaxial compression tests were conducted for gypsum granular materials. Meanwhile, the primary study on evolution laws of particle breakage was carried out. It was found that the deviator stress increases with the increase in confining pressures for gypsum granular materials at the same axial strain. The degree of particle breakage of gypsum granular materials increases with the increase in confining pressures. The relative breakage index can be adopted to denote the particle breakage degree and increases with the increase in confining pressures. When the initial grain size distribution of gypsum granular materials is fractal, the grain size distribution complies with fractal during compression under different confining pressures. The fractal dimension increases with the increase in confining pressures and can be adopted as a parameter for measuring the degree of particle breakage.
The Effect of Land Finance on Real Estate Prices
Authors: Zhou Yong , Zhang Shuang
Published: October 2011

Due to the fact that real estate prices is not only concerned with common people live and work in peace and contentment, but closely associated with the trend of national macroeconomic situation, the excessive rise in real estate prices has drew extensive attention in all layers of society. Many experts and scholars pointed out that high real estate prices in some cities and regions have already became the latent danger to the healthy and sustainable operation of macro-economy. Our country has begun to initiate control measures over the real estate industry forbidding the developers’ land reserves, accelerating the construction of policy-based house, and a series of measures to curb the excessive rise in price; however the effect of policy implementing is far from satisfaction. Under the background that the whole society all focus on the higher and higher prices, talking about the reasons driving the real estate prices to rise were particularly necessary. Land finance is not the authentic reason promoting prices and its effect maintains uncertain. The predecessor’s work still lacks of empirical research; what’s more, the effect of land finance on the real estate prices should be considerate from the point of its expenditure channel: the degree of its promoting real estate prices is to a great extent associated with expenditure channel in our country. Even if the benefit of land transfer is high, due to the balance of payment deficit is small or more expenditure on policy-based housing and the old city renovation. Land finance will finally weaken its promoting effect.
Experimental Research and Numerical Investigation of High-Strength Concrete Structure Strengthened with CFRP
Authors: Hai Hong , Gu Fan , Song Yan Sheng
Published: October 2011

The shear resistance at the interface between FRP sheet and concrete is a key problem for the application of fiber-reinforced plastic (FRP) plates, which has emerged as a popular method for the strengthening of reinforced concrete structures. The objective of this study is to discuss the interfacial shear ultimate bearing capacity of a high-strength concrete structure strengthened by carbon fiber-reinforced polymer composites under static loads. Considering the different strength of concretes, double-shear tests were conducted. Based on the test results, considering of the adhesive layer, explicit finite element is used for simulating the shear failure of CFRP-strengthened concrete, obtain the whole process of structure deformation development, describe the conformation and development of crack and the failure mode. The FE result coincides with the experimental result.
Comprehensive Evaluation Method Study of University Town Ecological Physical Environment (UTEPE)
Authors: Wang Bo
Published: October 2011

The premise that analyzing and studying the factors that effect university town ecological physical environment (UTEPE), UTEPE impact factors are the thermal environment, sound environment, light environment, eco-energy saving design. This paper establishes the evaluation method for UTEPE which is based on fuzzy math. We evaluate the quality of UTEPE comprehensively in this way. Renewable energy, nontraditional water source, green construction materials, water-saving appliances, energy-saving lamps, bicycle & public traffic system are very important for creating good quality physical environment in university town. In this paper, according to the impact factors of the UTEPE and using the fuzzy mathematical theory on evaluating the UTEPE comprehensively can reflect the real situation more objectively and accurately. The construction of model is simple and practical. Comprehensive evaluation utilizes the combination of the general public survey and expert evaluation, which benefits to reflect the democratic spirit. It also provides the reference to improve the UTEPE.
Practical Section Design Method of Widened Beam Flange Connections
Authors: Mao Hui , Li Cheng Hua , Wang Yan
Published: October 2011

By the method of the experiment and the finite element, the production, development regulation and location of the plastic hinge of widened beam flange connections were studied. The test results showed good agreement with FEM results and proved the finite analysis reliable. The test specimens were designed as the base samples. By choosing some different main references relating to section shape change of widened beam flange connections, a series of finite element specimens which include eighteen direct arc widened beam flange connection and eighteen welded side-plate widened beam flange connections were derived from the base samples. The influence of widened beam flange depth, length and distance on plastic hinge distribution is discussed respectively, at the same time, the plastic hinge location range was given and practical section design method of widened beam flange connection is provided by revising the parameter of plastic hinge center location ls.
Innovation of Urban Planning System and Urban Stormwater Flood Prevention
Authors: Yang Jian Hui , Liu Bo , Liu Zong Gang
Published: October 2011

With the increasing urbanization and the expansion of the city these years, the urban stormwater flood emerge frequently in all major cities in China and cause a huge casualties and property losses. Discuss the ideas and measures of prevention and control of urban stormwater flood by analysis the reason of the formation. Set up the concepts of stormwater resources not only to give priority to the emissions ideas. Bring the ideas of discussing the problem of stormwater resources from the aspect of innovation of rural and urban planning and design system. According to the comprehensive utilization of urban stormwater and emissions which each link specific characteristics, the author tried to establish an innovative of urban planning and design system to cope with the current situation which urban rainwater flooding frequently.
Analysis of the Application of New Energy when Constructing a Low-Carbon Eco-City
Authors: Miao Jun Qiang , Rui Dang
Published: October 2011

This thesis major in constructing low-carbon eco-city, analyzed kinds of application of new energies such as geothermal energy, solar energy in the construction of low-carbon eco-city, summarized a basic thought of constructing a low-carbon eco-city, And further elaborated from the eco-efficiency.
State-Space Solution of Estuary Bed Responses Subjected to Extreme Hydrodynamic Conditions. I: Tidal Bore
Authors: Pan Dong Zi , Wu Hui , Li Ying
Published: October 2011

The evaluation of the extreme hydrodynamic forces-induced dynamic response in bed is particularly important for coastal geotechnical engineers involved in the design of the foundations of marine structures at estuarine area. As the two main sorts of extreme hydrodynamic forces in Qiantang estuary, tidal bore and storm surge are considered in this work. This paper presents an analytical solution of the tidal bore induced estuary bed response. State-space method together with Laplace-Fourier transform techniques are used to solve the governing equations. The tidal bore-induced response of estuary bed can be calculated by using the matrix theory, boundary conditions and inverting integral transform. Compared with the special solution in preceding literatures, it’s shown that the proposed method has the advantage of high calculation efficiency and accuracy.
The Damage Evolution of Concrete Structure under Earthquake
Authors: Liu Hai Qing , Zhou Na
Published: October 2011

Theoretical study on earthquake damage under seismic load about of concreate structure，in order to better study the damage evolution mechanism of reinforced concrete frame structure in earthquake. The two-parameter seismic damage factor model,which is based on deformation and dissipation,was improved using the theoretical analysis method in this study .Using the three-level earthquake-resistant design damaging index based on the importance of structure as the collapse criteria for evaluation. Using the nonlinear dynamic finite element method and do a collapse numerical simulation analysis of a three layers concrete frame. Calculate the dynamic response and damaging factor of each time step, and study the damage evolution.The results show that the improved damage index calculating model can calculate both on the maximum damage index and structure damage index quantificationally and continuously and describe the process of collapse damage of the integral structure.
Study on Stochastic Damage Constitutive Relation for HSHPC Material Subjected to Uniaxial Tension Stress
Authors: Zheng Shan Suo , Tao Qing Lin , Liu Bin , Xie Ming , Hu Yi
Published: October 2011

Based on the kind of damage constitutive models, such as spring friction block model and spring model, which are proposed for ordinary concrete by domestic and foreign scholars, and taking the differences which are caused by different failure mechanisms in mechanical properties of HSHPC and ordinary concrete into consideration, this paper presents the spring-friction block model which is suitable for revealing the stochastic damage constitutive relation of HSHPC material subjected to uniaxial tension stress. By introducing the failure strain stochastic field of concrete material subjected to uniaxial compressive stress, and according to the principle of energy conservation during the process of damage failure, the stochastic damage constitutive equation of HSHPC material subjected to uniaxial tension stress is derived. The theoretical results agree well with the experimental conclusions, and it shown that the proposed stochastic damage constitutive relation can objectively reflect the failure mechanism of HSHPC material. The research achievements will provide a basic research method for establishing the dynamic damage constitutive relation of HSHPC material.
Damage Sensitivity Analysis for Main Design Parameters of Reinforced Concrete Shear Wall
Authors: Zheng Shan Suo , Tao Qing Lin , Hu Yi , Li Zhi Qiang
Published: October 2011

As an indispensable force component to the hybrid structure, the seismic wave energy inputted into integral structure is dissipated by damping force working and plastic hysteresis of reinforced concrete shear wall which is taken as the first seismic fortification line of structure. Considering of the condition that the RC shear wall is mainly used to dissipate the seismic wave energy, this paper takes the ultimate energy dissipation capacity of reinforced concrete shear wall subjected to cyclic loading as the damage characterization. According to the related theoretical analysis and experimental research, the method for calculating ultimate energy dissipation capacity of RC shear wall is proposed and the damage sensitivity of various design parameters which contain the sectional thickness, the strength of concrete and reinforcement ratio are analyzed, then the influence laws of main design parameters impacted on damage evolution of RC shear wall are revealed in this paper. The research shows that sectional thickness is the most sensitive factor in the damage of reinforced concrete shear wall and the concrete strength degree takes the second place, and then the reinforcement ratio is the most insensitive design parameter. The research achievements will provide theoretical support for establishing the storey damage model of SRC frame-RC core wall hybrid structure under seismic excitation.
Research on SUE DTA Model with Constant Demand Based on Probit Model
Authors: Shi Lei , Gao Li
Published: October 2011

Logit model is among the most important model in SUE DTA study. A lot of work have been done based on Logit model. As the other very important SUE DTA model, Probit model has not been the focus of many researcher. This paper presents a SUE model based on Probit model, which aims at building up the Probit model with constant demand. The existence and uniqueness of the model is presented, Finally, a algorithm is given.
Utilization Plan of Cooling and Heating Resources in Urban Sewage
Authors: Lin Zhen Guo , Guo Yan Ling , Zhang Su Yun
Published: October 2011

The cooling and heating resources contained in urban sewage have significant influence on the “energy conservation and emission reduction”. From the point of extensive utilization, the paper put forward the concept of sewage thermal-energy utilization plan, and discussed the types, goals, principles, content and steps of the plan. Selecting principles and flow-volume calculation method of flow nodes were also illustrated. The study results provide reference for industrialization of urban sewage thermal-energy resources application in construction.
The Experiment of Complex Biological Reactor to Treat the Sewage
Authors: He Ya Li , Yin Zhen Yu
Published: October 2011

Abstract: the complex biological reactor is the new biological processing equipment which combine the active sludge and the bilolgical membrane method. The use of this technique to deal with the sewage , as the result show, the dislodge of the COD ammonia and nitrogen is very stable, and it fit to the nation’s standard of sewage discharge.
Study on Traditional Miao Dwellings Based on Passive Ecological Strategy
Authors: Huang Hai Jing , Wen Yan
Published: October 2011

The mountain environment is the combination system of the natural geography, biology, humanities, economy and technology. Changing any one of these factors has impact on the overall environment. Therefore, mountain building should require more on the ecological awareness. Traditional houses are affected by the local economy, resources, climate, technology and other factors. And the naturally formed passive ecological concept fit well with the low cost, low technology, low energy consumption, low pollution and ecological design principles that the international community have advocated. This paper puts forward the mountain building passive ecological strategy and design method through collecting, sorting and analyzing the eco-building experience of traditional houses in the Miao nationality villages in Guizhou province. It expects to offer some enlightenment of creating geographical environment friendly, low-tech, modern ecological buildings.
Finite Element Method Analysis of the Mast of Rotary Drilling Rig
Authors: Guo Hong , Zhang Hai Long
Published: October 2011

The mast is an important support and loading component of the executive mechanism of rotary drilling rig, and plays a very essential role during the normal operating process for the whole machine. According to the work characteristics of the rotary drilling rig, the stress and deformation of the mast structure were calculated under the extreme conditions of two typical operations, which are drill-extracting and drilling conditions. The results show that the stress concentrated areas are located near the two connecting hinged joints between the mast and support cylinder and tripod under working conditions, and the results obtained from this paper can provide a theoretical reference for the design of the rotary drilling rig mast.
Demonstrative Study of the Ecological Post-Quake Reconstruction of Dwellings in Poor Rural Regions of China
Authors: Mu Jun , Zhou Tie Gang
Published: October 2011

After the earthquake in Sichuan of China in 2008, price increase of conventional materials, poor conditions in transportation and resources and low levels of economy and technology are the main challenges faced by villagers’ home rebuilding. Under this background, a comprehensive demonstration village rebuild project was launched. Based on locally available natural resources and recyclable materials from collapsed houses, the local traditional earth-based technology got greatly improved in anti-seismic performance via experimental studies. By prototype-based training, the villagers quickly mastered these upgraded techniques and rebuilt homes by themselves with minimized input of manpower and material cost. Their new earth houses show a far better performance in cost-efficiency, sustainability and comfort than local conventional rebuilt dwellings. It demonstrated and conveyed an affordable, ecological, healthy and humane way of post-quake village rebuild that local villagers could take, own and pass on.
Preparation and Properties of Organic/Inorganic Nano-Composite Phase Change Materials for Heat Energy Storage in Building Energy Conservation
Authors: Chang Jin , Duan Wu Biao , Liu Bo , Fu Sheng Jun
Published: October 2011

Latent heat energy storage is becoming more and more attractive for energy conservation of buildings. Phase change materials (PCMs) can be applied in building envelopes to conserve heat energy in building products. The technology of PCMs is efficient and economical due to the rising cost of fossil fuels and environmental concerns. In this paper, binary organic/inorganic nano-composite PCM by intercalation compound is prepared, preparation conditions are studied systematically; and structural analysis and characterization of performance are conducted. The results obtained show that a good potential for heating and cooling is in building through nano-composite PCM and overcomes weaknesses and deficiencies of pure PCMs. A simple modification of binary organic/inorganic nano-composite PCM is discussed firstly. Secondly, the various influencing factors of thermal storage capacity are discussed. The optimum experimental conditions for preparation of organic/inorganic nano-composite PCM are, 55%~60% for the content of organic substances, 5h for the preparation time, 70~80°C for the preparation tem. and 60~120 mesh for the best granularity of composite PCM.