bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Generalized Compatibility Equations of Quasi-Conforming Element Methods
Authors: Ding Ke Wei
Published: September 2011

Brief development process of the finite element method, foundation of quasi-conforming element has been analyzed from weak formulation generalized compatibility equations and its weak continuity condition in this paper. The quasi-conforming element methods are the exact solution of generalized compatibility equations and satisfy the weak continuity requirement naturally. The quasi-conforming element methods do not satisfy stress equilibrium conditions and concision calculating process of matrix’s athwart. The discrete precision can be predicted in prior. It also extends space of original finite element method and is landmark in computational mechanics.
Analysis of Folded Plates Using a General Finite Strip
Authors: Jiang Rui Juan , Wu Qi Ming , Yi Xiao Wei
Published: September 2011

In this paper, a general finite strip is developed for the static and vibration analyses of folded plate structures. The geometric constraints of the folded plates, such as the conditions at the end and intermediate supports, are modelled by very stiff translational and rotational springs as appropriate. The complete Fourier series including the constant term are chosen as the longitudinal approximating functions for each of the displacements. As these displacement functions are more general in nature and independent of one another, they are capable of giving more accurate solutions. The potential problem of ill-conditioned matrices is investigated and the appropriate choice of the very stiff springs is also suggested. The formulation is done in such a way to obtain a unified approach, taking full advantage of the power of modern computers. A few numerical examples are presented for comparison with numerical results from published solutions or solutions obtained from the finite element method. The results show that this kind of strips is versatile, efficient and accurate for the static and vibration analyses of folded plates.
Lagrangian Analysis Method with Least Square Cubic B-Spline
Authors: Tao Wei Jun , Huan Shi , Tan Xiang Qian , Jiang Guo Ping
Published: September 2011

The Lagrangian analysis method is re-analyzed. It is shown that when a series of stress profiles (or strain profiles, or particle velocity profiles) are measured to determine the strain-stress relation. In this paper, the stress histories at different Lagrange positions are measured by one dimensional SHPB experiments. The variation histories of various physical quantities are fitted to least square cubic B-spline function with a sufficient accuracy definite condition. The path lines of these quantities are constructed in terms of a least square quadratic polynomial. A program for inert flow of Lagrangian analysis (IFLA) is worked out. Taking the data of experiments as the input for the IFLA, the flow field information is solved. The error analysis shows that such a method has a definite reliability and stability.
Associated Analysis of Super Deep Building Foundation Pit’s Diapharagm Inclination and Soil Inclination
Authors: Ding Ke Sheng , Qiang Shao
Published: September 2011

Based on a certain super deep building foundation pit of Tianjin railway station, according to analysis of measured data and numerical analysis, it get the changing regular of horizontal displacement of retaining and protecting for foundation excavation——diaphragm wall, and surrounding soil around foundation pit. The conclusion would be helpful for the future similar projects.
Optimal Design of a Scroll Case with Natural Frequency Constraints
Authors: Bai Xin Li , Liu Gui Rong , Zhang Song An
Published: September 2011

In this paper, sensitivity formula with analytical method is derived for calculating structural natural frequency, and the partial derivative of plate element stiffness matrix and mass matrix with respect to design variables are gained respectively. Computer programs for computing frequency sensitivity with analytical method are developed. And combining it with large finite element structural analysis software ADINA, the optimal design software based on genetic algorithms, a structural dynamic optimization program system is constituted for computing structural natural frequency sensitivity with analytical method. Finally, the program system is applied to the optimal design of a turbine scroll case of a hydropower station (taking into account the natural frequency constraints). Calculation results show that analytical method presented in the paper is of higher computational precision, good stability, convenient to use, and can be popularized. Calculation results obtained the approval of client and used in real engineering.
The Effect from Hole Area on Pressure Waves Produced by a High-Speed Train through Tunnel with Perforated Wall
Authors: Mei Yuan Gui , Jia Yong Xing
Published: September 2011

The perforated wall has great effect on pressure waves produced by high-speed train through a tunnel. In this paper the effect is investigated numerically by the method of characteristics based on one-dimensional unsteady compressible non-isentropic flow theory. The numerical method is validated by experimental results of Netherlands NLR. The effect from hole area in perforated wall is investigated principally and the results shows that the pressure wave is alleviated remarkably in tunnel with perforated wall.
Effects of Hollowness on Strength of Double Skinned Concrete Filled Steel Tubular Columns of Different Geometries under Axial Loading
Authors: Muhammad Naseem Baig , Fan Jian Sheng , Nie Jian Guo
Published: September 2011

Concrete filled tubular columns (CFT) have been used in buildings and bridges since long in history, and research reported in china is since 1970s. It has become popular as structural members due to their excellent structural performance characteristics, which include high strength, stiffness and high ductility. In modern building construction, steel rectangular hollow sections (RHS), square hollow sections (SHS) and circular hollow sections (CHS) are often filled with concrete to form a composite column. Such composite columns are well recognized in view of their high load carrying capacity, fast construction, small cross section, and high fire resistance. Compared to concrete-filled steel tubular (CFT) columns, the DSCFT can reduce its own weight while have a high flexural stiffness. Compared to traditional RC bridge columns and CFT columns it has high bending stiffness, avoids instability under external pressure, is light weight, possesses good damping characteristics due to increase in section modulus. In present study it is found that there is a definite increase in strength. Circular columns had all the properties better than other geometric shapes; strength increase was almost 20 % as compared to square columns. It is expected that if same ratios are maintained at projected scale, there would be a definite increase in strength and behavior of the columns. New concept of hollowness introduced is valid for all geometric shapes in DSCFTs and gives fairly good idea about its limits and effects on strength of columns. The equations given in different design codes give conservative values and hence need to be revised for DSCFTs both for seismic and normal designs.
Study of the Comparison and Selection Method of the Mining Project Investment Based on Entropy-Weight Method
Authors: Wang Yang , Wu Shou Rong , Wang Zu He
Published: September 2011

In the 21st century, because the shortage of mineral resources has seriously affected the development of China's industrial economy, investment and construction of mineral resource project is a very urgent task we must face. To achieve scientific investment decisions, we should be conducting multi-item comparison on the basis of the comprehensive evaluation of mining project and choose the best investment project so as to achieve rational development and utilization purpose and obtain the best economic benefits. In this paper, entropy-weight method is used based on the analysis compared with other evaluation and decision method, which should be a valuable reference.
Bond Financing for Remediation and Redevelopment in Industrial Contaminated Site
Authors: Zhang Yi Chi , Liu Li , Dong Xiao Lin , Li Fa Sheng
Published: September 2011

According to the research on land securitization of China and other countries, land securitization of contaminated site in U.S., and a financial bond called Brownfields Value Contract in U.S, the relationships between stakeholders of contaminated site and participants of bonds were analyzed. And the contaminated site bond’s investors and their market demands were discussed as well. Furthermore, the initial concept on issuing the contaminated site quasi-municipal bonds was proposed in order to provide the theoretical framework and a basis for financing on sites remediation and redevelopment.
Attenuation Law of Blasting Seismic Wave Amplitude with Time and Calculation of Equivalent Elastic Modulus
Authors: Hu Shi Li , Yang Jian Yong , Wang Guan Shi
Published: September 2011

Abstract. The characteristic frequency was generated when blasting seismic wave propagate in rock mass. The characteristic frequency played an important role in the amplitude attenuation of seismic wave with time and propagation distance. Rock mass was simplified as visco-elastic media. The time attenuation model of seismic wave amplitude was studied by wave equation and the complex number theory. Theoretical analysis demonstrates that attenuation coefficient of seismic wave amplitude with time is mainly affected by rock viscosity coefficient and elastic modulus. The attenuation coefficient decreases with increase of elastic modulus. The attenuation coefficient increases with increase of viscosity coefficient. The test method of equivalent elastic modulus of rock mass was analyzed according to model of time attenuation of seismic wave amplitude in situ. The wave velocity test verified effectiveness of the method. A new method of determining rock mass mechanical parameter was put forward.
A Study on Large Power Jet Ventilation Technology in Long Tunnel Construction
Authors: Zhang Heng , Chen Shou Gen , Chen Liang
Published: September 2011

One of difficulties in super long tunnels’ construction is the construction ventilation to meet the requirement of normal construction environment and assure the workers’ health. Using traditional tunnelling ventilation is very difficult to meet the need of super long tunnel construction. As the energy assumption is high and it is very expensive. This paper investigated the simulation of tunnel construction ventilation with large power jet fans during the construction of Jinping Auxiliary Tunnels by using the computational fluid code FLUENT, the layout of jet fans in the tunnels is optimized. It is found that the best layout of the jet fan is aroud the transverse channel under the direction of airflow and jet fan should not be too far away from the transverse channel. The CO mainly distributes in the upper part of the tunnel when the jet fan is installed at a higher position, this layout of the jet fan is beneficial to construction of tunnels.
The Monitoring Data Analysis of Cover System in Subway Station
Authors: Huang Ming Li , Pei Shu Feng , Wang Wen Zheng , Liu Hua Kuan
Published: September 2011

Fengtail North Road Station uses a open and cover combination of laying fabricated strap method for the first time, so we monitor the Cover system very closely. We draw schedule curves and analysis the monitoring data for the main component’s monitoring projects of the Cover system. Results show that the deformation values of the components of the Cover system are small, but the values of piles top displacement and settlement are large, at the same time, the lattices of Cover boards have good wear-resistance ability. The conclusion has very great help for optimizing the system design and the promotion of laying fabricated strap method.
Collapse Accidents Analysis and Finite Element Simulation of Fastener-Style Steel Tubular High-Formwork-Support
Authors: Bian Guang Sheng , Jia Qiang , Chen An Ying , Gu Fang
Published: September 2011

There were four collapse accidents of fastener-style steel tubular formwork support being investigated in the article. The collapse mechanism was researched. According to the collapse accidents, the finite element model was established. The whole stability analysis was done. The analytical results were the same with the conditions of accidents. The collapse mechanism was verified. According to the collapse mechanism, the security technical measures of high formwork support were put forward.
Vertical Ground Motion Characteristics of Wenchuan Earthquake
Authors: Han Jian Ping , Yan Qing , Zhou Wei
Published: September 2011

The Wenchuan earthquake of May 12, 2008(Mw=8.0) was the most significant earthquake that had affected Chinese Mainland since the Tangshan earthquake of 1976. The dense network of seismographs deployed in this region recorded ground motion acceleration data with good quality. In this paper, vertical ground motion characteristics of Wenchuan Earthquake are investigated from the database including 282 records at 94 stations. Special attention is focused on the behavior of the recorded vertical ground motion and its relation to the horizontal ground motion counterparts. The results indicate that the average value of the ratios of vertical to horizontal peak ground acceleration (av/ah) is 0.58, but the ratios of over 30% stations exceed the rule-of-thumb value of 2/3. This av/ah is much discrete in the near-fault region and tends to decrease with the increase of epicentral distance. Furthermore, site condition also influences this ratio. The curve of vertical to horizontal acceleration response spectral ratio (Sav/Sah) with period ranging from 0 to 6s appears to be saddle-shaped overall and Sav/Sah value varies within different period range. It is also can be seen that the vertical acceleration response spectrum (Sav) looks thin compared with the horizontal acceleration response spectrum (Sah). Except several stations, the ratio of vertical to horizontal ground motion predominant period (Tpv/ Tph) is less than 1.0, and it increases with the increase of epicentral distance and becomes smooth gradually.
1D Time-Domain Nonlinear Analysis of Site Response under Strong Motion
Authors: Lu Tao , Lu Yu Lin , Huo Jing Yan
Published: September 2011

The Equivalent Linear Method is a common way used in earthquake engineering to analyze nonlinear site seismic response, but the response under strong motion is underestimated by the way. For analyzing nonlinear response more veritably, in the study, a time-domain nonlinear analysis method was proposed and used in a case for 1D seismic response analysis of soil layers under strong motion. The results obviously showed that, comparing with true nonlinear method, the Equivalent Linear Method underestimated in the case in natural period range of common civil engineering structures. The true nonlinear method adopted in the study is more fitful for nonlinear response of soil layers under strong motion.
The Mechanics Experimental Study of the Artificially Frozen Soil in Cretaceous Strata
Authors: Cui Hao , Li Dong Wei , Wang Ren He
Published: September 2011

Through the large number uniaxial strength tests and the creep test tests of the artificially frozen soil of Cretaceous strata, we obtained that the frozen wall in Cretaceous strata met the Moore - Coulomb strength criterion, and the artificially frozen soil strength increased from 6.5MPa in -5 °C to 12.0MPa in -15 °Cwith the freezing temperature decreased, Poisson's ratio from 0.35 down to -5 °C -15 °C at 0.18. Using viscoelastic-plastic theory we got the deep frozen wall strength and thickness of the Bojiang - Haizi mine in Cretaceous strata, practice showed that: the design approach in this paper was reasonable.
The Stability of a Rock Dam Site under Seismic Conditions
Authors: Hu Jin , Yang Xue Zhi , Zhang Yong , Zhong Jun Ye
Published: September 2011

This paper takes the Daliushu Dam Site in Yellow River as an example, which is located near the active fault zone with high seismic intensity. It studies the seepage of dam abutment rock mass in meizoseismal area and the stability under earthquake condition. The assessments on the key engineering problems of this project are based upon a large number of investigations, in-situ and laboratory tests, etc., which are carried out in the field by the author. We know that the "5∙12" Wenchuan Earthquake in 2008 triggered strong ruptures and damages of massif, and destructed the concrete facing of the Zipinpu rock-fill dam in Minjiang River, which is very close to the earthquake source and sufferd a 0.56g' seismic acceleration. For this reason, this paper analyzes the possible damage on the Daliushu Dam site rock mass under the grouting in the future earthquake, returning to the present poor quality condition of rock mass, while this dam shares the seismic intensity, seismic acceleration, dam type and dam height similar to the Zipinpu Project. This paper puts forward a new research thought, which is the longtime -lasting strong earthquake,first causes the rupture of rock mass and the decrease of rock mass mechani cal parameters, and the lasting earthquake will then worsen the rock mass structure mechanics parameters, and even cause the large-scale massif damage. From this viewpoint, this paper, analyzes the stability of the dam foundation and abutment rock mass especially the stability of the thin massif of the right dam abutment by the numerical analysis. The analysis show that under the normal and the earthquake conditions (excluding the rock mass damage and mechanical parameters decrese resulted from the lasting earthquake), The Daliushu Dam Site and the right dam abutment are still stable when the safety factor is assumed to be 0.802 under the lasting earthquake. In addition, the calculation results show that the stability is not enough.
Quantitative Analysis on Ventilation Network Reliability Assessments
Authors: Wang Hong De , Mi Hua Li
Published: September 2011

In order to prevent the hazards of rock burst and the spontaneous fire in deep-level mine and ensure that the ventilation run safely and reliably, the variation trends and the distribution rules of the air flow in deep-level mine are analyzed. Based on the network flow theory and statistics principle, the density equations of the air quantities in the airways are established. With the maximum likelihood estimation (MLE), the rationality of the parameters in the air quantities distribution equations is verified. By means of the disjoint minimal path set algorithm, the reliability assessment models of mine ventilation network are founded. All the calculation processes are realized in the environment of MATLAB. The results indicate that the indexes of the quantitative analysis reflect the practical situation of the ventilation network in Daliuta coal mine.
Analysis of Curved Girder Bridge Seismic Collision with Implicit Contact Algorithm
Authors: Xu Qiang , Qi Xing Jun
Published: September 2011

Aiming at the collision phenomenon of the curved continuous girder bridge under the earthquake, the three-dimensional finite element model is established considering the collision element between the abutment and the end beam. Using the nonlinear time-integration method, the simulation analysis on the collision with implicit contact algorithm is used, and the collision law at expansion joints of curved gride bridge is studied. The results indicate that the shear forces and bending moments of piers with different heights are different. The collision force at the central part of the cross-section is small, and it gradually increases toward both sides of the cross-section with parabola. The outer collision force is bigger than the inner collision force, and the response of Elcentro ground motion is more obvious than that of Tianjin. The results may serve as a reference for seismic design of curved continuous bridges.
Foundation Numerical Analysis on Soft Soil Reinforced with Stone Columns
Authors: Wang Shu Li , Mu Man Gen , Dai Jing Yu , Hu Xiao Huan
Published: September 2011

A parametric study of an foundation on soft soils reinforced with stone columns is performed using Phase2D. The real foundation is modeled and its bearing capacity is decided by the columns and their surrounding soft soil. The following parameters are analysed: the replacement area ratio, the deformability, mean stress, absolute horizontal (vertical) displacement, volumetric strain, maximum shear strain of the foundation. Based on the results of this study, a new design method is proposed: for decreasing the settlement and satisfying bearing capacity, increasing the replacement area ratio is good idea.
Anti-Wind Safety of Guangzhou New TV Tower During Construction
Authors: He Jun , Wu Xiao Ping , Yan Zai Chun
Published: September 2011

The Guangzhou New TV Tower with a total height of 610 m is the tallest tower in the word. It comprises a 454 m high main tower and a 156 m high antenna mast. The main tower is a tube-in-tube structure consisting of a steel lattice outer structure and a reinforced concrete inner structure. The antenna mast is a steel structure founded on the tope of the main tower. To ensure the safety during construction of this challenging structure, the failure probability estimates under wind load during construction has been performed. The estimates consists of three steps. First, the cumulative distribution functions (CDFs) of static wing loads per year at Guangzhou site are given out. Secondly, the CDFs of horizontal displacement responses during construction of the Guangzhou New TV Tower to static wind loads are derived based on static analyses of a reduced finite element (FE) model of the structure. Finally, anti-wind safeties during construction of the structure are estimated based on the structural reliability method. The study not only provides useful data concerning the structural safety of the Guangzhou New TV Tower during construction but also is of considerable referential importance in estimating the safety of an in-construction supertall structure.
Research on Design of the Green Construction Scheme for the Engineering Project Management
Authors: Zhang Jian Wei , Zhu Min Jie , Zhang Li Wei
Published: September 2011

Green construction is the main reflection of the sustainable development strategy in the application of engineering construction, and the important composition of Sustainable building industry. This article takes the green construction scheme design as object of study, summarizes the present situation and the shortage of green construction scheme design in China, and makes a certain degree of analysis. Through the research on the green construction management implementation, the design principle and the overall framework of the green construction scheme is determined by raising the green construction consciousness, solving economic security, establishing and perfecting the legal system of rules and regulations, evaluation system, and regulate the green design framework of content, promote the concrete implementation of green construction.
A Model for the Soil-Water Characteristic Curve and its Application in Dam Engineering
Authors: Shi Zhen Hua , Gao Zhao Wan
Published: September 2011

A mathematical model for the soil-water characteristic curve is proposed in the light of bounding surface plasticity. The main drying and wetting curves are taken as the asymptotes of the scanning curves, and only one additional parameter is introduced to simulate such scanning curves. To pave to the way for the application of the proposed model, the governing equation of unsaturated seepage problems and the finite element formulations are derived. A FEM program incorporating the SWCC model is then developed and used to study the hydraulic behaviour of an earth dam undergoes a repeated change of reservoir level. Numerical results confirm the possibility and necessity of using such a hysteresis model in unsaturated seepage problems.
Technical Research on Fully-Mechanized Fast Drivage for Deep Large Sections of Coal-Rock Roadway in High Stress
Authors: Zhang Dong Sheng , Zhang Wei , Wang Xu Feng
Published: September 2011

Based on the achieved engineering practice results of deep roadway drivage in Xinwen Mining Area, aimed at drivage problem of deep cross-level coal-rock, EBZ-135 fully-excavating machine had been used to replace traditional roadway blasting drivage, corresponding key technology of fast supporting for deep large sections of coal-rock roadway in high stress had been proposed, and latter mating transport system transformation of fully-mechanized fast drivage technology had been cooperated, which formed a suit of fully-mechanized fast drivage technology for deep large sections of coal-rock roadway in high stress. The application results show that the fully-mechanized fast drivage technology can markedly enhance the whole shaping quality of roadway, improve drivage efficiency and cycling footage immensely, reduce roadway drivage cost, and the good result of average month footage at 300 m and maximum month footage at 360 m have been achieved finally.
An Optimal Identifier-Selection Method Based on Recognition Probability of Expressway Network
Authors: Zhang Hao , Xu Dong Bin , Ge Tao , Xing Yan Ying
Published: September 2011

An identifier-selection method based on the recognition probability of the expressway network was proposed. Firstly, the probability model of the route network is built through the known information, such as the network topology of the expressway, the traffic flow density and the identifier accuracy. Secondly, the recognition probability of expressway network is calculated based on the recognition probability of the competitive paths. Finally, an identifier-selection method is provided. The results verify the rationality and practicality of the method.
SEA Subsystem Property Identification by Periodic FEM Approach
Authors: Gao Jie , Chen Ke An
Published: September 2011

A study on SEA properties of periodically stiffened structure was accomplished based on the periodic theory. With application of certain software, a simulation was performed on a common periodically stiffened fuselage structure. The results indicate such modeling approach reflects relatively accurate property of subsystem in mid and high frequency range, while a remarkable improvement could also be expected in low frequency range, especially for complex structures. Such approach was approved as one reliable engineering method for solving dynamic response of periodic structures.
Flow Field Numerical Optimization of a Large Self-Dumping Truck Hydraulic Tank
Authors: Liu Shui Chang , Li Li Fu , Gu Zheng Qi , Zhang Yong
Published: September 2011

Various return oil channels of a large self-dumping truck hydraulic tank don’t work synchronously brings the exit temperature fluctuations, traditional heat balance calculation can’t get some point temperature in tank, so it can’t be used to analyze temperature fluctuations. Selecting RNG k-εturbulent model and using CFD method，this paper analyzes flow field in the hydraulic tank of a certain large self-dumping truck at first, then according the principle of enhancing heat exchange, proposes two structure improved schemes, and contrasts the simulation result of two schemes, The results show that the two improved schemes reduce the tank exit temperature fluctuations and the high local temperature at different degrees, and the temperature fluctuations reduce range of the best scheme is 86.51% when the initial hydraulic oil temperature is 40°C.
Structural Dynamic Analysis Based on Inversion Reduced-Basis Method
Authors: Li Yong Hong
Published: September 2011

Efficiency and accuracy of forward problem are important in structural analysis. A real-time algorithm, called inversion reduced-basis method (IRBM), is applied to analyze a dynamic problem. A spring-mass system is taken as an example, results computed from finite element method and IRBM are obtained. Comparing results from the two methods, IRBM can get high-precision results quickly.
Research on the Method of Comprehensive Zoning Indices Analysis in Natural Zoning for Highways
Authors: Li Chao , Wang Yu Lan , Yang Hong Zhi
Published: September 2011

Natural Zoning for Highways is the important basis of highway network planning and establishment of related specifications and standards. Determination method for influence coefficients of comprehensive zoning indices analysis model is the key to increase quantization degree of comprehensive zoning indices analysis. Based on the theories of fuzzy clustering and rough set, this paper put forward the method to reasonably determine the influence coefficients of single elements and calibrate the analysis model of comprehensive zoning indices through analyzing the calculation elements data by random sampling method. Highway surface configuration index(HSCI) was analyzed with this method. The map of HSCI reflects the influence degree of surface configuration on highway engineering in different regions in China correctly. Analysis result shows that the method improves the quantization degree of comprehensive zoning indices analysis.
Numerical Simulation Analysis of the Ultimate Bearing Capacity of the Circular Steel Tube K-Joints Reinforced with the Concrete
Authors: Zhou Hong Bin , Zhang Qiao Zhen , Liu Yun , Dong Jun Ying
Published: September 2011

In order to solve the insufficient bearing capacity of the large-diameter circular steel tube K-Joints, the chord in the joint zone is filled with the concrete. The reinforcement of bearing capacity that the concrete makes to K-Joints is researched with the finite element numerical simulation method, in consideration of the material nonlinearity and the geometric nonlinearity. The numerical computation of bearing behavior is employed to eighteen groups of the large-diameter circular steel tube K-Joints and reinforced ones with the concrete (RK-Joints). The failure styles and the influencing factors of bearing capacity are analyzed with RK-Joints. The result shows that the bearing capacity of K-Joints is enhanced significantly by the concrete filled in the chord in the joint zone. The load-deformation curves reveal the changing regularity that the bearing capacity of joint follows the relevant parameters. It can provide reference for the engineering application of RK-Joints.
Numerical Analysis of Fluid-Structure Interaction of Frame Structure Considering the Impact of Turbulent Wind Load
Authors: Sun Wen Bin
Published: September 2011

According to the basic principle of CFD simulation and methods, a framework structure was studied for its vortex-induced vibration and control principle of around the flow field, it revealed the characteristics of vortex-induced vibration and rules, systematically studied frame structure fluid-solid coupling effect and the flow field active control methods and mechanism. Results provide the theory basis for the frame structure around the flow field and the wind induced vibration effect.
3D Complicated Model Establishment and Analysis of Interactions between the Mined-Out Regions and Surface Structures
Authors: Wang Shu Ren , Yu Jing Min , Zhang Hai Qing
Published: September 2011

For difficulties and deficiencies for complex geologic body and structural engineering with FLAC3D, the three-dimensional complicated model was built by using MIDAS/GTS-FLAC3D coupling technique, which was based on the Kangjiagou-bridge-Miaoliang-tunnel project crossing the mined-out regions in Liulin section of Qingdao-Yinchuan highway. The interactions between the mined-out regions and surface structures such as the tunnel lining and bridge were analyzed as the following sequence of operations: the mining process step-by-step was performed corresponding to the years, and then the grouting treatment was carried out after mining coal in Kangjiagou, next, Miaoliang tunnel was excavated and Kangjiagou bridge was constructed. The surface deformations under different working conditions were revealed, and the ground subsidence basin characteristics were analyzed. Also, the deformations and forces of key bearing parts of the tunnel lining and bridge structure were predicted in order to guide the engineering design and construction. The above-mentioned results have important theoretical meaning for guiding the similar engineering practice.
A Conceptual Framework for a BIM-Based Collaboration Platform Supported by Mobile Computing
Authors: Chen Yuan
Published: September 2011

The construction industry has been known as a complicated environment with respect to the multiple phases and multidisciplinary participants. The emergence of new concepts and information technologies including BIM, IFC, Web, wireless networks and Mobile Computing, give the construction industry a powerful potential to build a platform allowing project participants to work collaboratively. This paper reports a conceptual framework for a BIM-based collaboration platform that contains the model of BIM-supported integration for construction processes and the technological architecture for the system. This paper concludes with suggestions for further developing and testing of the conceptual framework.
The Finite Element Analysis on the Mainframe of High-Pressure Grouting Machine
Authors: Yu Dong Ling
Published: September 2011

The mainframe of high-pressure grouting machine used for daily ceramics is the main load bearing member, and it has high strength and stiffness requirements. The finite element static analysis on mainframe is discussed in this paper for researching its stress and transfiguration. The result can provide reference for design, and the discussion has some generality and practical value engineering.
Occupational Safety in the Construction Site: Survey and Principle in Cheng Du
Authors: Zhang Hong
Published: September 2011

This paper describes a survey of site safety organization in construction sites. It explains the principle of a successful safety organization and system for Construction Company based in Cheng Du, Si Chuan. Most employees of the company and some of the subcontractors took part in the survey more than 10 construction projects. Total, 365 valid records were obtained from the construction sites. The results of the survey provide reference to project managers and construction safety officers. Last, analysis and summary are given in this paper.
Quality Control in Expressway Construction by Hard Asphalt
Authors: Meng Yong Jun
Published: September 2011

The increasing scarcity of modified asphalt is affected by storage stability at the present , then the preparation of high strength bituminous mixture gradually become a trend which adopted by hard asphalt of low-grade . This paper determines appropriate mix through the laboratory tests for hard asphalt which was verified in the trial section proves that the desire for load performance in highway engineering can be satisfied with this asphalt type.
Identification of Success Factors in Minimizing Delays on Construction Projects in IAU - Shoushtar Branch - Iran
Authors: Pourrostam Towhid , Ismail Amiruddin , Mansournejad Mahmood
Published: September 2011

Delays in construction projects are usually inevitable, and most projects are not completed on time. The scope of this study was to find out the factors that are responsible for minimizing delays on construction projects in Islamic Azad University (IAU) Shoushtar Branch in Iran. The overall ranking of most vital factors causing delay and how they cause it, as well as effective methods of minimizing delay on construction projects was obtained by the mean rank score. It was found that the use of experienced contractors and subcontractors, financial difficulties by contractor and change orders by employer during constructionwere some of the factors responsible for delay. However, time and cost overrun were seen to be the major factors causing delay. The result showed that the use of experienced contractors and subcontractors, accurate initial cost estimates and clear objective and scope were effective methods of minimizing delay on construction projects. The results obtained here, though peculiar to a certain area can be adopted for other case studies in which similar problems are encountered.
Investigation on Duct Grouting Quality of PC Continuous Box Girders
Authors: Wu Wen Qing , Chen Shuai , Ma Xue Yuan
Published: September 2011

Based on three bridge dismantlement, duct grouting density of prestressing tendons was investigated in-situ . The indices were analyzed statistically to find out the construction quality of PC box-girders in China. The investigation result indicated that the duct of prestressing tendons were only partially grouted, with over 50% ungrouted for longitudinal tendons and over 70% ungrouted for transverse tendons. Obviously, this increased the prestress loss in the tendons. The quantitative indices proposed in the paper is helpful in understanding the underlying reason for cracking and over flexing in the PC box girder ,and it also provided the important basis for structural analysis of PC box-girders.
Study on the Smoke Evacuation and Safety-Evaluation of Oversized Shield Machine in Tunnel Drilling
Authors: Wang Wei Min
Published: September 2011

Based on the data of the extra large diameter and extra distance of drilling of the Shanghai Yangtze Tunnel Highway, the paper introduces various fire scenarios under shield construction, and examines the distribution of various tunnel fires according to the actual circumstance of tunnel construction, patterns of smoke change of various fire circumstances; The thesis also provides significant measures and time for evacuation, and the features of fire expansion and smoke circulation in different fire situations, It compares fire expansion and smoke extension in different fire situations, analyzes patterns of fire expansion and smoke extension in different measures of fire prevention and their impact on the consequences of fire. Meanwhile, the thesis evaluates the effect of fire prevention, and explores some basic principles and safety measures for evacuating performance and fire rescue, crew safety and efficiency according to the temperature in the tunnel, pressure and smoke extension with fire
The Application of Physical Planning Theory in Objective Management
Authors: Tang Yan Qun , Zeng Wei
Published: September 2011

Basing on the analysis of problems existing in the comprehensive decision-making and balanced optimizing of project programs, the writer has introduced the method of physical planning to solve the problems of comprehensive decision-making and optimizing in the quality of the project management – time limit for a project - cost, and established the quality - time limit for a project- cost comprehensive evaluation and decision model as well as the quality - time limit for a project - cost optimization model. The proposed method has been proved effective through the cases of highway engineering project management.
Mechanical Analysis on Reinforced Concrete Beams under Salt Fog Corrosion Test
Authors: Yan Xi Kang , Li Zhan Wei , Chen Pei , Liu Jun E
Published: September 2011

In the background of buildings in coastal area being corroded by salt fog, this paper studies 12 beams of different intensity and protective layers to simulate the real effect of the corrosion for 20 years. Elaborates the phenomenon of enhancement of the concrete compressive strength and the bearing capacity and cracking load of test beams, and makes an indepth analysis on the mechanism of this phenomenon, at the same time the concept of the additional expansion prestress is introduced; a mathematical model of the additional expansion prestress is establish and the computational model of the cracking load is derived.
Reform Measures of Human Resources Management in Construction Enterprise - Based on Employees’ Satisfaction
Authors: Tang Yan Qun
Published: September 2011

At present the construction enterprises in our country expand rapidly toward building collectivized operation and a series of development bottleneck problems appear, in which building human resources management is of great importance and plays a key role. The level of human resource management in China's construction field is in general backward. How to advance the level of human resource management through improving employee satisfaction is the key factor to human resource management in the construction industry. And employees’ satisfaction can be achieved in three ways: Firstly, perfect employee welfare system to increase the investment to employees; secondly, improve performance evaluation system to guide the staff professional development; thirdly, set up employee training and developing system to promote the establishment of learning organization.
Integrative Fuzzy Set Pair Model for Safety Pre-Evaluation in Construction Stage
Authors: Li Li Xin , Li Hong Zhen , Duan Yu Bing , Wang Xu
Published: September 2011

The integrative fuzzy set pair model, established by set pair analysis (SPA) and fuzzy hierarchy analysis, was introduced to pre-evaluation of security states in the construction stage. Two relevant sets, evaluation index and dangerous standard, were analyzed and calculated in terms of the identity, discrepancy and contradistinction[1]. The indices and weights were determined by Delphi and fuzzy hierarchy analysis respectively in order to establish the integrative fuzzy set pair model of construction stage. Finally, the model was applied to the case study of Shenyang sewage treatment plant and the results demonstrated that the method proposed in this present paper is satisfactory.
A Study on Patent Strategy of Enterprises in Wuhan Based on Smiling Curve Theory
Authors: Lu Xia
Published: September 2011

Based on the analysis of patent protection and strategy of enterprises in Wuhan, this paper, adopting approaches like literature reviewing, diagrammatic presentation and logical reasoning as well as the Smiling Curve theory, reveals that patent strategy is a part of holistic enterprise strategy. This paper also indicates that patent, as the specific resource of enterprises, its strategical planning and implementing plays practical significance in leading enterprises moving to the high value-added sections. Thus, the patent strategies are put forward accordingly including self-owned core patent strategy, paid-transfer patent strategy, patent-purchasing strategy, cross licensing patent strategy,etc. This paper suggests that, driven by patent strategy, more values could be made through transforming to the two ends of the smiling curve, promoting the bottom and right part of the curve and the whole moving upwards so as to create high additional value.
A New Method for Desalination of Seawater With Steam-Ejector Refrigeration Plant
Authors: Chen Jin Zeng , Li Yan Fei , Li G. H
Published: September 2011

Desalination of seawater has played an important role in many arid regions in the world. There are many methods for desalination of seawater, such as MED, MSF, RO, ED, TVC, and MVC, etc. Different methods have different advantages and disadvantages. In the present work, a new method for desalination of seawater with steam-ejector refrigeration plant was introduced. The main purpose of the new method is a hybrid plant of TVC and steam-ejector refrigeration. In the hybrid circle, no other energy was need. When the steam-ejector refrigeration plant is working, the seawater as cooling water is introduced into evaporator of TVC and evaporates. The vapor getting in TVC is extracted by a second steam-ejector, together with the active steam, is used as source of heat for desalination. The main advantage of this hybrid plant is that part of the heat energy of cooling water in refrigeration is reused. Comparing with other distillation method desalination of seawater, the energy consumption is much less. Especially on marine usage, the advantage is clear.
Experimental Research on Seismic Behavior of Dual Function Slotted Infill Wall
Authors: Li Yan Yan , Li Pei Lei , Rong Xian
Published: September 2011

According to the dual impact of infill wall on the frame structures, the normal infill wall has been improved. In order to investigate the seismic behavior of infill frame structures with different vertical slit width under reversed cyclic loading, experimental research on three groups of infill frame structures has been performed. And the failure characteristic, bearing capacity, ductility and hysteretic property are analyzed. From the results of test, it can be seen that infill frame structures with slits have a good seismic performance and the vertical slit width is an important factor, which affects the seismic behavior of the frames. With the increase of the slit width, the yield load and bearing capability decline significantly and the ductility becomes low sharply. Moreover, three groups of infill frame structures also have a better deformation behavior, which can meet the requirement of antiseismic design.
Analysis on Key Points of the Post-Disaster Reconstruction Engineering Cost Management
Authors: Li Jing Ya
Published: September 2011

Based on the study of some post-disaster reconstruction project examples and related policy documents,this article analyses the existing problems of the post-disaster reconstruction project engineering cost combining with the actual engineering projects of the post-Wenchuan earthquake reconstruction. Then it discusses the factors that affect the post-disaster reconstruction project engineering cost and puts forward some suggestions for it in the end. The study of this paper expects to provide some theoretical and practical references for the subsequent engineering practices, and hopes not only promoting the limited government post-disaster reconstruction special funds to realize their maximum utility, but also enhancing the whole level of our countries'reconstruction management and engineering cost control.
Analytical Solutions at Three Freedom Direction for Curved Beams with Clamped-Pinned Ends under Thermal Load
Authors: Li Xiao Fei , Zhao Ying Hua , Yu De Hai
Published: September 2011

The purpose of the paper is to present analytical solution of curved beam with clamped-pinned ends under thermo load based on the principle of thermal expansion and theory of virtual work. A class of equations for in-plane displacements at three freedom direction and internal forces in the cross-section of statically indeterminate curved beams under thermo load are derived explicitly. In the case of infinite limit of radius, these equations coincide with that of the straight beams. Compared with the results of FEM, the analytical solutions by the proposed formulae are accurate. The analytical solutions obtained in this paper would provide a scientific base for further study and design of the curved bridges.
Intermediate Diaphragms Arrangement in Horizontal Curved Composite Box-Girder Bridge with Corrugated Webs
Authors: He Jun , Han Bin , Liu Yu Qing , Chen Ai Rong
Published: September 2011

Horizontally curved box girder bridges inherently exhibit complex torsional and distortional behavior as well as bending due to the initial curvature. As to the horizontal curved composite box-girder bridges with corrugated webs, diaphragms were arranged reasonably to reduce torsional and distortion effect for safety and stability due to the coupling of bending and torsion effect for initial curvature and reduced bending stiffness in horizontal direction for corrugated steel webs. Finite element models for a 3-spans continuous horizontal curved composite box girder bridges with corrugated webs were established. Comparing the ratio of warping normal stress to bending normal stress, the influence of the number and spacing for diaphragms on distortion control for curved bridges is investigated. Extensive parametric studies (including central angle, the aspect ratio of the box section, the spacing of the intermediate diaphragms)are performed and the design suggestions for the maximum spacing of the intermediate diaphragms are presented.