bluuebunny/crossref_metadata_2025 huggingface dataset:
Experimental and Simulation of Kinematics of Multi-Droplet of Emulsion under Electric Field
Authors: Wang Chang Yong , Qian Huan Qun
Published: September 2011

Experiments have been performed to observe the kinematics of multi-droplet moving in a stationary emulsion exposed to a horizontal electric field of different magnitude. The droplet motion is recorded by a high-speed CCD camera. A Lagrangian framework is outlined to simulate the kinematics of multi-droplet by means of cluster integration method. The droplet size distributions computed are qualitatively consistent with the experimental picture. It is clarified from computation that the effect of the electric field intensity and the viscosity of the oil on the droplet motion. Experiments have been performed to observe the kinematics of multi-droplet moving in a stationary emulsion exposed to a horizontal electric field of different magnitude. The droplet motion is recorded by a high-speed CCD camera. A Lagrangian framework is outlined to simulate the kinematics of multi-droplet by means of cluster integration method. The droplet size distributions computed are qualitatively consistent with the experimental picture. It is clarified from computation that the effect of the electric field intensity and the viscosity of the oil on the droplet motion.
Numerical Simulation of Vortex-Induced Vibration for Two Circular Cylinder in Tandem Arrangement
Authors: Zhao Jing , Guo Hai Yan , Li Xiao Min
Published: September 2011

The vortex-induced vibration of a single and a pair of equal-sized circular cylinder separated by 5.5D in tandem arrangement is investigated. The computations are carried out for various values of reduced velocity of the oscillator (Ur=1.85~9.7). The results of numerical simulation for a single cylinder by the present method are observed close to the data of experiment. And then, the dynamic response and force coeeficient of two cylinders can be achived by the same method. The results show that the upstream cylinder responds qualitatively similarly to a single cylinder. While the downstream cylinder shows a different behavior. All kinds of cylinders undergo a figure of 8 motion.
Welding Defect Analysis in Thin-Walled Steel Tube under Bending Moment
Authors: Geng Jin Feng , Cai Hong Sheng , Liang Xing Pei , Wang Hui , Wang Yu Jie , Wang Zhao Hua
Published: September 2011

The linear elastic problem for two welded thin-walled steel tubes containing circular arc weld defect subjected to bending load is analyzed in the present paper. The welding defect is firstly simplified as a circular arc crack and then the finite element based technique is used to calculate the corresponding energy release rate (J-integral), which is related to stress intensity factor directly. Finally, the arc length of welding defect is changed to investigate the variation of stress intensity factors.
Direct Coupling of NBEM-FEM for Problems of the Interaction of Ground and Foundation Beam
Authors: Zhao Hui Ming , Cheng Hui Dong , Peng Wei Hong , Dong Zheng Zhu
Published: September 2011

The precision of the solution of the interaction of ground and foundation beam with the coupling method of traditional boundary element method (BEM) and FEM is usually not very high. The direct coupling model of NBEM and FEM for solving the interaction of foundation ground and foundation beam was set up firstly. Then the loads under foundation were worked out with the direct coupling method. The comparison of results between the direct coupling method and other methods proved that precision of the solution of the direct coupling method is higher.
An Engineering Method to Calculating JWL Constants of Explosives
Authors: Ning Peng Fei , Tang De Gao , Qu Xia
Published: September 2011

The JWL equation of state is used worldwide to describe the pressure-volume-energy behavior of a detonating explosive. Obtaining the JWL constants needs experiments and iterative calculation, and so is expensive in time and economy. The JWL constants found in the literature is only suit for sample of a certain density, while it is simple to have slight density differences in application. In this paper an engineering method to calculating JWL constants while the density of explosive changed is proposed. An example is given out and it is shown good agreement between the experiment results and numerical simulation.
Fuzzy AHP GA-Based Optimization Design of SRC Beam
Authors: Zheng Shan Suo , Li Zhi Qiang , Hu Yi , Tao Qing Lin , He Wei
Published: September 2011

Genetic algorithms (GA) are very effective at finding optimal solutions to a variety of problems. This innovative technique performs especially well when solving complicated real-world problems. Therefore, this paper aims to use the fuzzy analytical hierarchy process (AHP) GA approach to optimize SRC beam. In the process of optimization, the matlab toolbox with GA is used. To increase the performance of the genetic-based approach for optimization problems, the design constraints related to member stress, bending moment etc are described by using fuzzy set theory. Finally, a example for beam optimization is presented. The example shows that the approach is flexible enough to deal with optimization of SRC beam.
Analysis of Surface Deformation by Tunneling Excavation under Small Strain
Authors: Zhang Pei Sen , Yan Wei
Published: September 2011

In this paper, small strain model, being able to reflect the small strain characteristics of soil, was adopted to calculate and analyze surface deformation caused by shield tunnel construction. Under the single tunneling, the maximum surface settlement is generally just above the tunnel axis, and surface settlement is symmetric distribution on both sides of the tunnel axis, and decreases with the increase of the horizontal distance; the longitudinal surface settlement is "tilted S-shaped" curve, and tends to basically stabilize at a certain position behind the excavation face; The comprehensive comparison shows better consistency between the data from small strain model and those from actual measure, and then verifies the feasibility and effectiveness of the small strain model applied for surface deformation analysis caused by urban metro shield construction.
Experimental Study on the Deformation Behavior of Symmetric Stainless Steel I-Beams
Authors: Wang Yuan Qing , Chang Ting , Shi Yong Jiu , Gao Bo
Published: September 2011

In order to investigate the inelastic deformation behavior of stainless steel beams, 4 stainless steel welded beams under pure bending and concentrated load were performed in this paper. The grade of stainless steel was approximately equivalent to UNS S31600. The relationship between load and deflection was discussed and the comparison between experimental results and results obtained by different methods, including finite element analysis method, simplified method proposed by Pro. Wang, Pro. E Real and EN 1993-1-4 Eurocode 3. The results showed that the deformation behavior of stainless steel performed non-linear load- deflection relationship because of the influence of nonlinear material properties. The deflections obtained by those methods were lower than the experimental results.
Discussion on Crack of Aerated Concrete Block Wall
Authors: Liu Xiu Li , Guo Chao , Wang Xin Bo
Published: September 2011

Aerated concrete block has been used in infill wall of projects widely, but the cracking of aerated concrete block wall is a new common quality diseases appearing. This paper discusses the cause and treatments of common crack of aerated concrete block wall, which can provide a reference for the same kinds of engineering.
New Pedestal for Pre-Tensioned Pre-Stressed Beam Construction
Authors: Zhu Deng Yuan , Yao Zhan Yong , Zhang Yong Wei
Published: September 2011

Taking the advantages of groove pedestal and pier pedestal, a new type of pre-tensioned pedestal is constructed. The new pedestal makes full use of the deck (also the bottom formwork of the beam) to bear the tensile force so as to reduce the quantity of the pedestal construction. The new pedestal can adapt to variable geotechnical conditions by properly enlarge the arm of the turnover moment and the self-weight. The new pedestal is optimized through the bearing capacity analysis of the anti-overturning, the anti-slipping, the table anti-compressing, the force transfer plate, and the cross tie beams. The stress distribution of local bearing bracket is calculated by the finite element method so as to be reinforced accordingly. Based on practical application in some project, the new pedestal has the features of technical feasibility, security & reliability, affordability, and convenience in operation.
The Field Measured Study of Freezing Pressure in Deep Fractured Rock
Authors: Cui Hao , Li Dong Wei , Wang Ren He
Published: September 2011

In order to obtain the internal frost heaving force development characteristics and change rule of frozen wall in the process of the formation and melting in cretaceous stratum, and then take analysis of mechanics features and safety evaluation of frozen wall, in a mine of Inner Mongolia, the field measurement research of internal and external frost heaving force and pore water pressure in the freeze-thaw process of frozen wall has been carried out. The measured results show that it formed uneven frost heaving stress in internal and external of frozen wall in freeze-thaw process, in the test the maximum of freezing pressure reach to 6.0MPa, it is 2.4 times of initial pressure in the layer; When the shaft excavated to test layer the freezing pressure reduced linearly, then the freezing pressure rebounded slightly when the wall was pouring, and finally the frost heaving force reduced to 0 when frozen wall melt, back to the pressure effected by soil and water.
Comparative Study of Seismic Response of Solid Pile with Hollow Pile
Authors: Zhang Yong Mou , Yan Qiang Gang
Published: September 2011

The seismic responses of solid pile and hollow pile were analyzed and compared in this paper. According to the deflection equation of pile during earthquake, rotation, bending moment, shear force and soil resistance of pile were obtained. The differences of deflection, rotation, bending moment, shear force and soil resistance between hollow pile and solid pile, whose effective areas of cross-sections were same, were found. From calculation results, hollow pile had certain advantages in seismic performance. This study provided a theoretical basis for the applications of hollow piles in practical engineering.
Numerical Analysis of the Construction Influence of Deep Foundation Pit on Adjacent Open Trench Tunnel
Authors: Wu Cong Shi , Shen Wei Da , Liu Gong
Published: September 2011

The open trench D ramp of Yingpanlu Xiangjiang tunnel in Changsha and the adjacent building foundation pit construction were excavated almost at the same time. The minimum distance between the two pits was only 8 meters, and keeping both projects safe working became difficult in engineering. Therefore a special project example of numerical analysis model was established, which can simulate the whole construction course. The construction stress was analyze by combining with the soil and retaining structures displacement, and the results were compared with the actual measured data to provide a reference to the design and construction optimization.
Experimental Research on Engineering Property of Heavy Metal-Contaminated Kaolinite
Authors: Liu Zhi Bin , Ma Xin , Dai Wen Long
Published: September 2011

Due to release and accumulation of industrial contaminants in natural soil in some regions, and the long-term interaction between leachate and clay which is adopted as isolation material of contaminants, the engineering property variation of clay soils after having been polluted by heavy metal ions gradually has drawn more and more attention of environmental geotechnical engineers. With relatively high chemical stability and low expansion coefficient kaolinite is widely distributed and usually used in engineering practice. In this research, Pb, Zn, and Cu-contaminated kaolinite specimens of controlled initial dry density and water content were manually prepared through static compaction. Then expansion capacity, unconfined compression, electrical resistivity and one-dimensional consolidation tests were conducted. It is found that the expansion capacity of contaminated kaolinite is influenced by the type and concentration of heavy metal ion. The unconfined compressive strength of heavy metal-contaminated kaolinite is decreased in a short period, but it may increase in a long term. Unconfined compressive strength of the same type of heavy metal-contaminated kaolinite will change with the contamination concentration. The electrical resistivity of kaolinite would be decreased when contaminated by heavy metal ions. The higher the contamination concentration is, the lower the electrical resistivity will be. All the compression indexes of heavy metal-contaminated kaolinite become lower than that of the clean kaolinite, and it also depends on both the type of heavy metal and contamination concentration. For the three types of heavy metal ions, Pb has the greatest influence on the engineering property of kaolinite, while the effects of Zn and Cu are quite similar.
Construction Technology and Quality Control Measures of Bored Pile
Authors: Hu Ming Hua , Gu Lian Sheng , Tang Di Lian
Published: September 2011

Filling pile is a common form of pile foundation work, it passes the superstructure loads to the deep stabilitily soil or rock , reducing the non-uniform settlement of ground and foundation. Because of bored piles is done underground, underwater, quality control is difficult. The construction technology and quality control measures of bored pile is been introduced.
Monitoring and Treatment during the Water Leakage Process of a Deep Subway Station Pit
Authors: Wu Cong Shi , Liu Gong , Shen Wei Da
Published: September 2011

A remedy scheme of water leakage in the deep foundation pit of a subway station is introduced. The deformation and axial forces of the supporting structure as well as the underground water level were monitored during the leaking prevention process. At the same time, a plane model was developed to simulate the construction process of foundation pit by FEM. Then, the fundamental reason for the leaking of the foundation pit was analyzed by numerical results and in situ measured data. Furthermore, importance of the strength of the supporting structure to the excavation of the foundation pit was also detailed demonstrated. Finally, the remedy measures were put forward to prevent the water leakage, which were proved to be effective and feasible in practice.
Finite Element Analysis to Vibratory Drum - Soil Model of Vibratory Roller
Authors: Cao Yuan Wen , Huang Xue Jiao , Ma Li Ying , Qiu Sheng , Gui Shao Xiong
Published: September 2011

In this paper a dynamical equation about vibratory drum - soil system was set based on the non-linear character of vibration compaction of vibratory roller. The finite element model of vibratory drum - soil system was established by the finite element software ABAQUS, with which the vibration compaction process of vibratory drum is simulated. According to the analysis of the vibration propagation on the soil surface, the longitudinal vibration propagation of soil, the stress and strain of the soil under the vibratory drum, results have proved that it is valid to simulate the interaction between vibratory drum and soil by the nonlinear finite element method, which offered a new way to research the interaction between vibratory drum and soil.
Study on the Best Reinforcement Arrangement of Thick-Walled Cylinder
Authors: Xu Yun Qian , Lu Ai Zhong , Zhang Ning , Cui Pan
Published: September 2011

In order to improve the ultimate bearing capacity, In this paper, the theory of functionally graded material is introduced. This paper simulate thick-walled cylinder with functionally graded characteristics through the analysis of using different reinforced ways along the radial direction. The author analyzes the stress state of the thick-walled cylinder with plain concrete and three different reinforced ways under the radical uniform load. Comparisons and evaluations are provided based on ANSYS results. The paper provide a reasonable reinforced way that is a larger reinforcement ratio near the outer and a smaller reinforcement ratio near the inner and is different with the traditional way. But the worst reinforcement arrangement is that a larger reinforcement ratio near the inner and a smaller reinforcement ratio near the outer. The conclusion shows that the principle that larger reinforcement ratio should be adopted where the tangential stress is larger is not suitable to the thick-walled cylinder.
Calculation Method for Bridge Temporary Structure Based on Graphic Flow Technology
Authors: Huang Ling , Shang Yan Liang , Zhang Hao
Published: September 2011

Abstract. For the bridge temporary structures, the present mainstream calculation method is based on dialog box data entry or command flow technology, in view of their insurmountable defects, a new calculation method based on graphic flow technology is presented and implemented in this paper. The comprehensive solving process of bridge temporary structure is planed and decomposed into a series of easily implemented sub-steps, their calculation models can be described by a group of independent and cooperative function graphic object types, in which global or local structure features, construction specifications, dynamics characteristics, engineering experience, intention expression, expert solving plan and other comprehensive application knowledge can be expressed easily. By creating, operating and deducting these function graphic objects, the solving sub-steps can be easily implemented. As a result , the comprehensive solving process for bridge temporary structure based on engineering features can be realized , and the simplification and high efficiency of solving process are achieved. The new method is also can be applied to other complex engineering structure fields, development practice shows its broad application prospect and development space.
A New Correlation Matching Algorithm Based on Differential Evolution for Aircraft Geomagnetic Aid Navigation
Authors: Xu Zun Yi , Liu Yi , Yan Lei
Published: September 2011

Considering the requirements of the high accuracy, high reliability and real-time capability for the aircraft geomagnetic correlation matching algorithm, the similarity core function, geomagnetic properties and search methods will be processed synthetically in this paper. The correlation variance is introduced as the similarity core function, the feature normalization of the geomagnetic field is introduced as the matching parameters and the differential evolution algorithm is introduced for reducing the running time. The experiments have been done in the laboratory based on the actual measured geomagnetic field data, its results show that: the matching probability and accuracy of the new algorithm are better than the traditional one on the whole and the average running time is shortened from 7～11s to 1～2s.
Numerical Simulation of Square Steel Tube Beam Filled with Steel-Reinforced High-Strength Concrete Dynamic Response under Impact Load
Authors: Li Shun Bo , Yang Jun , Xia Chen Xi , Chen Da Yong
Published: September 2011

Using ANSYS / LS-DYNA to study the dynamic response of square steel tube beam filled with steel-reinforced high-strength concrete under impact loading at different speeds. The numerical simulation results show that: At different conditions of speed, the concrete failure modes are different. The combined action of Steel tube and steel flange makes the stress wave propagation extremely complex in the beam, when the speed increased to a certain value, it made damage to the internal steel flange and flange lateral concrete under impact load, while the concrete between the top of steel flange and steel tube was protected by the combined action.
Structural Finite Element Analysis of the Fixed Stiffness Testing Instrument
Authors: Zhang Xiao Hui , Cui Jun Jia , Lei Cheng Xi , Xing Zhong Wen
Published: September 2011

Stiffness is one of the most important performance indicators of cars’ parts. Currently, most of the major automobile panels are made of big sheet metal, whose stiffness are relatively small, which lead to a lot of difficulties in measurement during practice. The high stiffness of fixed stiffness testing instrument with gantry structure makes the automobile panel measured precisely. The finite element model was established by ANSYS in order to study the effect of load at typical work locations on strength and stiffness, and the strength of testing instrument under maximum load was also illustrated. The results showed that the displacement of the load point and the work load performed the linear growth. When the testing instrument was imposed the maximum working load, the displacement of load point was less than the measuring precision. The strength and stiffness of the testing instrument met the requirements of operation.
Merge Concreting and Crack Control Analysis of Mass-Concrete Base Slab of Nuclear Power Plant
Authors: Zhang Zhong , Zhang Xin Bin , Wang Xiao Dun , Zhang Tao , Zhang Xiao Xu
Published: September 2011

It’s extremely strict on crack of nuclear power plant containment for the durability and barrier to nuclear leakage. High concrete strength and large heat of hydration make it difficult to control construction cracks. At the foreign and domestic nuclear power plants delamination or subregion had been adopted normally for mass concrete construction, but still more cracks appeared, and had paid great costs to deal with them. Based on theoretical analysis, in the article the study on merge concreting and crack control technical of base slab of the current popular CPR1000 nuclear power plant containment is carried out. Through the analysis of thermal stress laws on the placement of the different thickness, different sliding ability, different curing methods and construction capabilities and influences of other installation and construction process under the merge concreting, the paper puts forward and validates the feasibility of the merge concreting, and propose many crack-prevention measures from the design, construction, monitoring of temperature stress and shrinkage and others. Finally, the merge concreting has been successfully applied, breaking the routine and having been achieved remarkable economic and social benefits.
Research on Spatial Modeling of the Combined Beam-Arch Bridge
Authors: Shi Ying , Shi Jie , Fang Shan Ting , Chen Wei
Published: September 2011

Combined with one specific engineering example, in which the novelty and complexity of the bridge has to be taken into account, a complex spatial simulation model including beam, plate, and solid elements is established by the application of MIDAS/Civil2006, then its internal force is calculated and analyzed. But through this method, the model is complex and the calculation efficiency is not high. So how to use the grillage theory to construct model for the bridge to improve the design efficiency is necessary. Specifically, the model is established only by beam elements, in which compression-flexure member, shear-bending member is simplified as grillage or column case. The result of the comparative analysis on the two models shows that both the support reaction and the internal force or stress are in agreement under the dead weight and moving load, as well as the fundamental frequency and vibration. So the result of the simplified model according grillage for unitary analysis has sufficient precision. And the simplified method can provide some reference for spatial analysis of other similar bridges.
Research on Water Stability of Superpave Asphalt Mixture
Authors: Guo Xue Dong , Cao Jian , Fang Xiang Yang
Published: September 2011

At present, the highway construction of China is in the stage of rapid development. A variety of asphalt mixtures have been applied to a certain extent in the highway construction. However, the water stability of asphalt pavement is also a serious problem to the highway. This research studies the water stability of a new kind of asphalt mixture—Superpave by changing the water content in different condition. The following conclusion can be found in this paper. In the normal saturated condition, the maximum water content of Superpave asphalt mixture is 0.35%.And in the vacuum saturated condition, the maximum water content of Superpave asphalt mixture is 1.78%.The water of Superpave asphalt mixture takes nine days to drain completely in the normal saturated condition. But in the vacuum saturated condition, the time is more than two months. In different water content conditions, the splitting tensile strength of Superpave asphalt mixture is 0%> 100%> 25%> 75%> 50%.
Study on the Structure Optimization of the Real Estate Industry Based on Low-Carbon Economic Model
Authors: Jia Hong Jun , Tang Na
Published: September 2011

Facing the questions of the global climate change and energy shortages and other issues, the low-carbon economic development model which based on the low power consumption, low pollution, and low-carbon emission is paid attention by more and more enterprises. This paper based on the low-carbon economic development model to analyze the present structure’s status of the real estate industry and look forward to real estate developments. By analysis the factors of constraints in low-carbon real estate development from the policies and regulations, market orientation and other aspects, and puts forward several suggestions on structure optimization of the real estate industry.
Analysis of Uniaxial Dynamic Performance of Concrete-Filled Square Steel Tube Composite Column
Authors: Cui Xi Guang , Xu Hai Dong
Published: September 2011

Considering the strain rate then puts forward the modified uniaxial dynamic constitutive model related to strain rate in concrete-filled square steel tube and the modified calculation results match well with the experimental results. Based on the above conclusion, uniaxial compression performance finite element analysis with different strain rate among 10-5/s–10-3/s is completed, the results showed that strain rate can obviously change the dynamic performance of the concrete-filled square steel tube. Through the analysis of the influencing factors of the core concrete compressive strength, it is showed that with the increasing of the strain rate and the improving of concrete strength, the ultimate bearing capacity of concrete-filled square steel tube is higher and the ductility is reduced. With the increasing of stirrup ratio, ultimate bearing capacity is greater and the ductility is enhanced. With the sectional dimensions increasing, the ultimate bearing capacity is greater and the ductility is enhanced.
Studies on Green Houses’ Cost Based on Value Engineering
Authors: Yan Jing , Yin Li Xin , Li Guo Wen
Published: September 2011

The green house can save resources and harmonize with nature. The major functions of the green house should be environment-friendly, saving energy and comfort. These functions rely on some key saving energy technology using in the house. Green houses’ cost will be higher than ordinary house because of using saving energy technology. The green houses’ value increase and the cost control may realize through the value engineering analysis.
On the Initial Establishment of Quality Assurance System for Indemnificatory Housing
Authors: Xu Wei , Yan Yan
Published: September 2011

The comfortable housing project for low-income urban residents possess many special characteristics such as large numbers, dispersed distribution, the large-scale of construction, urgent time schedule and strict requirement of high quality. To ensure reasonable period and construction cost, it is also necessary to reform and innovate the way of construction management thinking and working methods. Pre-control measures of construction quality are put with emphasis on transforming passivity supervision into initiative forewarning. Management efficiency of the comfortable housing project can be enhanced. The comfortable housing project for low-income urban residents is built into environmental project taken to develop energy-saving and ground-saving residential in our country. It is a realistic and sharp contradiction that construction enterprises are pursuing profit when indemnificatory housing constructing is weak of profit, and that it is an easily occurred problem that the quality of indemnificatory housing is not security. In this paper, based on the six sigma quality management the Quality Assurance System of indemnificatory housing is put forward, which can be regarded as guidance for construction enterprises.
The Game Analysis of Rent-Seeking Behavior in the Public Project
Authors: Jiang Kai , Peng Ying , Chen Yu Shui
Published: September 2011

Rent-seeking behavior in the public project is a problem which the construction administrative departments at all levels always attach great importance to. This paper analyzed the causes and harms of rent-seeking behavior in the public project. At the same time, according to the hypothesis that supervision department can drive its right impartially, this paper established a tripartite incomplete information static game model in the public project, and then analyzed the own rent-seeking behavior of supervision department, and got the specific measures that could reduce rent-seeking behavior.
Post Occupancy Evaluation Study in Hospital Buildings – a Pilot Study
Authors: Zuo Jian , Yuan Xue Liang , Pullen Stephen
Published: September 2011

Building stock plays a critical role in the sustainability agenda worldwide. It consumes a large proportion of energy and is one of the biggest carbon emitters. Hospital buildings are no exception. Therefore, the performance of hospital buildings is critical to achieve the overall carbon emission goal. Post occupancy evaluation has been a popular tool and technique to evaluate the building performance which provides feedback to the building design and construction. This paper investigates the post occupancy evaluation of hospital buildings. A typical hospital campus in China is selected for this research purpose. The results showed that, even though not being implemented widely in China, the POE is an effective and useful tool for building performance evaluation. In addition, the relative importance of POE study criteria is highlighted.
Identification and Evaluation of Causes and Effects of Change Orders in Building Construction Projects
Authors: Pourrostam Towhid , Ismail Amiruddin , Mansournejad Mahmood
Published: September 2011

Change orders are one of the main problems in construction projects. The objectives of this study are identification and evaluation of causes and effects of change orders as well as procedures of change orders control on building construction projects in Islamic Azad University (IAU) Shoushtar Branch in Iran. It is found that contractor's financial difficulties, previous construction delays by other contractors working on different contracts were important factors responsible for change orders in construction projects. However, there are five important factors that have been identified as having the greatest effects on change order. Finally, important methods in procedures of change orders control are recommended. Although, the research is restricted to IAU-Shoushtar Branch, the findings of construction management problems are common to other universities in their building construction projects.
The Influential Factors and Association Rules for Bridge Deck Deterioration - Case Study of National Bridge Inventory Data
Authors: Huang Rong Yau , Chen Ping Fu
Published: September 2011

Bridge is the hub of a road, playing an important role in transportation. With the age of bridges increasing in recent years, the condition of bridges is deteriorating. Bridge deterioration usually results from multiple factors. Studies in exploring the factors leading to bridge deterioration and its state estimation are booming. However, studies in the relationship between bridge deterioration and external environment by using database are still limited. Since 1992, National Bridge Inventory (NBI) has collected basic and historical information of bridges in every state, a very rich database which should include some valuable knowledge. Hence, through clustering and classifying in data mining, this study explores association rules for bridge deterioration, which is displayed in decision tree with clear routes for reference. Using association rules developed by thus study, bridge maintenance personnel can understand the future state of the bridge under their jurisdiction, respond to risks and costs of bridge deterioration, extend the service life of bridges, and protect the safety of road users.
Empirical Study of Risk Management of International Hydropower General Contracting Projects
Authors: Yin Zhi Gang , Li Wei
Published: September 2011

This study focuses on the risk management of international hydropower contracting projects. The approach of questionnaire has been used to identify risk factors, and statistical analysis software has been applied to carry out statistical analysis on the survey data to calculate and sort the comprehensive indexes of the levels of key risk factors, thus providing operable and guiding technological approach for the risk management of international hydropower contracting projects.
Study on Civil Architecture Energy Conservation Efficiency Fuzzy Synthetic Evaluation
Authors: Wang Yong Ping , Yang Pei , Dai Chun Quan
Published: September 2011

Civil architecture energy conservation efficiency evaluation is a kind of multi-factors, multi-hierarchies and multi-criteria synthetic evaluation. Perfect civil architecture energy conservation efficiency evaluation indicators system and reasonably effective synthetic evaluation methodology are keys to do energy conservation efficiency synthetic evaluation. This paper is based on framing civil architecture energy conservation efficiency evaluation system, and uses fuzzy synthetic evaluation methodology to frame civil architecture energy conservation efficiency fuzzy synthetic evaluation model, in order to make the result of evaluation more objective and reasonable.
Research and Implementation on a Web-Based Project Cost Integrated Management System in China
Authors: Liu Yong , Zhang Li , Wu Shu Lian
Published: September 2011

The author tries to develop and implement a web-based Project Cost Integrated Management System (WPCIMS) in China. The targets, the Cost Breakdown Structure (CBS) and its code system, the functional planning, the framework and the technical index of the WPCIMS were presented firstly. Then, experimental implement of this developed system were put forward in 3 A/E/C project. Finally, an empirical interview survey targeting the project managers of the studied 3 cases was carried to estimate its implement performance. Results show that the acceptance and implement of the WPCIMS can significantly improve the performance of the project cost control, and successful implementation of the WPCIMS, in terms of leading to better outcomes for the A/E/C project, Coordination improvement among participators and Reduction of contract disputes, etc, is not simple a matter of introducing the system into an project organization. Instead, it must be associated with overall project management approaches such as a suitable organization mode, an appropriate system, the standard workflows, adequate personal trainings and even a coordinated project management philosophy.
Displacement Back Analysis for Rock Parameters of Deep Foundation Pit
Authors: Jiang Zhao Hua , Zhang Yong Xing
Published: September 2011

Numerical analysis is effective means to evaluate deep excavation influence in the sensitive environmental condition, and it is key issues to choose the elastic modulus of rock parameters reasonably. Based on the finite element theory, the relation between rock mass elastic modulus reciprocaland and the objective function value is a quadratic function in the elastic zone of multilayer layers, and then the optimal value of elastic modulus is obtained by polynomial interpolation method. Combined with the practice engineering, the elastic modulus of rock mass excavation is back calculated in the sensitive environmental condition and the effects of excavation are evaluated on the surrounding tunnel. The results show that the method is more convenient, and provide a reference for foundation pit construction.
Applied Research on the Enterprise-Level Project Management System and Information Construction of Project General Contractor Enterprise
Authors: Zhang Jian Wei , Zhu Min Jie , Zhang Li Wei
Published: September 2011

This article mainly studies the establishment steps of the enterprise-level project management system, aiming at solving the existing problems about project management in the general contractor enterprises. Based on the specific establishment steps of project management system , this article analyzed the present situation in enterprise of project management, and put forward ideas that establish the enterprise-level project management system to solve problems, therefore，put forward proposal to realize the above ideas by using information integrated solution, completing the enterprise strategic target.
Carrying Capacity Calculation of Externally Prestressed Profiled Steel Sheet Composite Slab
Authors: Liu Li , Yi Ji Bin , Wang Fang
Published: September 2011

According to the structural features and actual load carrying status of externally prestressed profiled steel sheet composite slab, in consideration of the deformation of the whole prestressed structure, the prestressed incremental calculation formula is established with force method and the prestressed incremental calculation formulas for arranging reinforcements in straight line or fold line with deviators; according to the positions of neutral axis, the stress-strain of externally pre-stressed profiled steel sheet and concrete composite slab section is analyzed so as to derive the calculation formulas for the elasticity bending bearing capacity and ultimate bending bearing capacity of the externally prestressed profiled steel sheet composite slab.
Experimental Study on Impact Resistant Performance of Steel Beams
Authors: Yang Run Lin , Li Yuan
Published: September 2011

Impact damage of building structures occurs frequently nowadays, and failure of key components of the structures may lead to the collapse of the whole buildings which could cause serious consequences. Thus, it is necessary to study on the impact resistant performance of the members. The different protective measures against impact loads were examined through the experimental testing in this paper. A tube steel beam with the rectangle cross-section was selected as the tested object. During the experimental testing, the different weight of the drop hammers and the different shapes of the contact surfaces were designed for sake of comparison. The strain history at the middle span of the steel beam under the impact load was measured by a Fiber Bragg Grating sensor. By comparing the strain values, the experimental results show that the composite layer which consists of the rigid and the flexible plate is superior to the single layer which only consists of the rigid plate, and have a better effect for suppression of the dynamic response against the impact loads.
Experimental Study on Post-Anchoring Drawing Out Property of Inorganic Materials
Authors: Cui Shi Qi , Jiang Li Ping , Cheng Bo , Li Tan , Du Tao
Published: September 2011

Through the test and theoretical analysis of post-anchoring drawing method for inorganic materials, the paper discusses the influence factors of implanted reinforcement drawing technology for inorganic materials of the concrete structures and analyzes the influence of concrete strength, anchoring depth of implanted reinforcement, shape of reinforcement and diameters on the inorganic material reinforcement implanting technology, providing theoretical basis for the preparation of Technical specification for post-anchoring used in concrete with inorganic anchoring material.
Analysis Research of Reinforced Concrete Z-Shaped Column Normal Section Bearing Capacity
Authors: Li Bai Shou , Yang Bin Bo
Published: September 2011

In view of the fact that the Z-shaped reinforced concrete column normal section bearing capacity formula has not been clear about the difference stipulation question with other specially column section bearing capacity computation, carries on axial compression-test of the Z- shaped reinforced concrete column with different volume reinforcement characteristic. In this article, established the Z shape column's load - elastic curve, promoted the Z-shaped column normal section bearing capacity formula including section correlation coefficient, and carried on the simulation using the ANSYS finite element software. The result indicated that the ANSYS simulation value was closely with the experimental value and the formula predicted value, and the formula predicted value security, has the high reliability.
Experimental Study on Size Effect of Flexural Capacity of RC Free Beams
Authors: Zhou Hong Yu , Li Zhen Bao , Guo Er Wei , Zhang Jing
Published: September 2011

Reinforced concrete calculation theories at the present stage are mainly based on experimental results of small size specimens, studies on the size effect of flexural capacity of large-scale reinforced concrete beam are not sufficient. Main research contents in this paper are the size influence on bending performance of under-reinforced beam, which can help to revise the related design theory. The paper collects test information of five different section size samples in different loading stage, including bearing capacity, deflection, section strain and so on. The total number of specimens is 13.Based on test failure process, development of cracks and deflections, analysis on section stress and strain, the safety of related bearing capacity formula is verified in research scale.It is also found that the safety reserve of calculation theory shows a trend of decrease with the specimen dimension increasing. As for large-size bending specimens, the code value of ultimate strain under non-uniform compression is bigger than test value.
Elememt Stiffness Matrix of Members of Reticulated Shell with End Springs
Authors: Wang Xing
Published: September 2011

In this paper, a tangent stiffness matrix of members with end springs of reticulated shell is derived on the basis of Timoshenko’s beam-column theory. In this matrix, joint’s axial stiffness and bending stiffness are considering together, non-linear beam-column element with end springs and rigid ends is taken as the analysis model of members of reticulated shell. In this matrix, not only coupling effects of bending in two axes but also joint’s stiffness and joint’s size are considered, not only the effect of axial force on bending but also the effect of axial force on torsion are considered. Higher order terms in the displacement function are considered. So this matrix is perfect and more precise than Oran’s tangent stiffness matrix. An example of a single layer reticulated shell is provided, which verified the correctness and good accuracy of the present model, and this model can be suited to the non-liner stablity analysis of reticulated shell.
Dynamic Response of Deep Underground Structure under Explosion Seismic Wave
Authors: Lu Hao , Cao Qi , Du Rui , Wang De Rong
Published: September 2011

The box structure is a typical underground protective structure, whose mechanical response to explosion seismic is of great interest in protection engineering. In this work, the rectangular force and combining dynamic and static methods have been employed to identify the mechanical behavior of deep underground structure under explosion seismic. The effects of ratio of side length, the incident angle, surrounding properties etc. were considered and the mechanical model which can describe the interaction between structure and soil was also developed. Finally, the dynamic response of box-type structure was analyzed.
Experimental Research on Pavement Performance of Cement Stabilized Base Recycled Mixture
Authors: Li Xu Wei , Dong Ming Ming
Published: September 2011

According to the renovation project of an arterial road, this paper systematically studied the pavement performance of cement stabilized recycled mixture in the base. Three types of mixture with three levels of recycled aggregate component were used to study the fatigue performance, which was assessed by the value of splitting tensile strength. This paper focused on the fatigue performance variation of the mixture under different levels of recycled aggregate component and tried to maximize the use of recycled aggregate in the mixture. Experimental methods and related research findings presented good reference for design and application of recycled aggregate mixture in the base as well as construct quality control.
Decoupling Analysis of Coupling Deformation of Rectangular Composite Sandwich Thin-Walled Bar
Authors: Wu Zu Lie , Ding De Wei , Jing Sheng
Published: September 2011

Based on the general description of the coupling deformation of composite sandwich thin-walled bar and the structural characteristics of rectangular sandwich bar, this paper studies the decoupling methods and approaches for composite sandwich thin-walled bar control equations and puts forward the decoupled control equations and boundary conditions.
Nonlinear Free Vibration of a Double-Deck Reticulated Shallow Spherical Shell
Authors: Li Yong , Xu Jia Chu
Published: September 2011

This paper deals with non-linear free vibration of double-deck reticulated shallow spherical shell by applying the non-linear theory of double-deck reticulated shallow spherical shell established by the author. Model function is supposed to be theory solution of small deflection. The proper equation of double-deck reticulated shallow spherical about time functions with two types of boundary conditions is derived by using Galerkin’s method. At the same time, the analytical expression of ratio of non-linear vibration and linear vibration is deduced and the non-linear effect about amplitude is discussed. Numerical examples are given as well.
Nonlinear Analysis for Masonry under Monotonic and Low Cyclic Loading
Authors: Huang Yan , Kan Ming Hui , Wang Zi Fa
Published: September 2011

Abstract: Confined masonry with tie columns and ring-beams was adopted during the reconstruction in the rural and suburban areas in Sichuan Province after the 2008 Wenchuan Earthquake. Based on the results of the sample tests of building material such as clay brick, cement mortar, steel and concrete in reconstruction and the analysis on the characteristics and features using Solid65 elements in ANSYS, the shear property of joints in masonry structures under different vertical load (σ∕fm) is numerically simulated. Comparing the experimental results with the numerical ones, the proposed values for the shear transfer coefficients for open and closed crack of Solid65 elements for simulating masonry structures are given. The seismic performance of confined masonry walls (strengthened by tie column and ring-beam, etc.) and unconfined masonry walls with different stress condition (σ∕fm) under low cyclic load are discussed. Results show that, under monotonic loading, confined masonry walls have better performance for displacement and load corresponding to the occurrence of the first crack as well as for the ultimate load and ductility, although the energy dissipating ability of unconfined walls under low cyclic loading increases with vertical load (σ∕fm) at low stress level. The results demonstrate that confined walls are greatly enhanced by strengthening measures such as tie column and ring-beams.