bluuebunny/crossref_metadata_2025 huggingface dataset:
Discussion the Effect on Improving Granite Bituminous Mixture Performance by Adding Coupling Agent
Authors: Zhang Ai Qin , Wang Yan Min , Zhuang Chuan Yi
Published: October 2012

In this paper, improved adhesion of between asphalt and granite and the performance of high temperature and water stability of granite asphalt mixture by the coupling agent were discussed. The results show that the titanate coupling agent and silane coupling agent doped in asphalt can significantly improve the rutting resistance and water stability of the granite asphalt mixture.
Research on the Paving Performance of Montmorillonite/SBS Modified Asphalt Mixtures
Authors: He Zhong Guo , Tang Xin De , Yin Wen Jun , Sun Yi Fan , Liu Zhong Bo
Published: October 2012

Montmorillonite/SBS composite modifed asphalts were prepared by mixing montmorillonite with SBS-modified asphalt, further the corresponding asphalt mixtures were obtained. The paving technical indexes of the mixture such as physical properties, moisture suscepyibility, and high temperature stability were tested, and compared with that of the corresponding SBS-modifed asphalt mixture and base asphalt mixture. The results demonstrate that the montmorillonite/SBS composite modifed asphalt mixture exhibites enhanced stability, improved flow value and moisture susceptibility, and increased high temperature stability.
Catalytic Membrane and their Photocatalytic Properties
Authors: Hu Chen Yang , Zhang Xiao Bo , Li Xiao Yun , Chen Hui
Published: October 2012

A solution method was developed to synthesized heteronanostructure of Ag nanoparticles on titanate nanowires, and then flexible photocatalytic Films were made by these nanowires. The nanowire is about 50 nm in diameter, several hundreds micrometers in length. The size of the Ag nanoparticle grafted on the nanowire is about 50 to 100 nm. The nanowire Film showed excellent photocatalytic activity to decompose the methamidophos and satisfactory antibacterial effect to kill Escherichia coli.
Performance and Benefits Evaluation of Two Water-Source Heat Pump Systems for District Heating
Authors: Chen Xiao , Han Jie , Zeng Jing
Published: October 2012

The heating source of a district heating (DH) system in Beijing was reformed from coal boilers to a groundwater heat pump (GWHP) system and a sewage source heat pump (SSHP) system. This study aims to evaluate the actual performance and benefits of two water-source heat pump systems. We found total energy savings and primary energy saving rate due to the retrofit to be 950 tons of standard coal equivalent (TCE) every year and 34.6%, respectively. Field test results indicated the necessity of system performance improvement. Appropriate approaches to improve the system performance were discussed.
Research on Waste Heat Recovery in Drain Water of Barbershop
Authors: Sun Fang Tian , Wang Na , Fan Yun Ze , Li De Ying
Published: October 2012

Drain water at 35°C was directly discharged into sewer in most of barbershop with Electric water heater. Heat utilization efficiency is lower, and energy grade match between input and output is not appropriate in most of barbershops. Two waste heat recovery systems were presented according to the heat utilization characteristics of barbershops and principle of cascade utilization of energy. One was the waste heat recovery system by water-to-water heat exchanger (WHR-HE), and the other is the waste heat recovery system by water-to-water heat exchanger and high-temperature heat pump (WHR-CHEHP). The two heat recovery systems were analyzed by the first and second Laws of thermodynamic. The analyzed results show that the energy consumption can be reduced about 75% for HR-HE, and about 98% for WHR-CHEHP. Both WHR-HE and WHR-CHEHP are with better energy-saving effect and economic benefits.
Simulation Analysis of Heat Transfer on Low Temperature Hot-Water Radiant Floor Heating and Electrical Radiant Floor Heating
Authors: Qi Han Bing , He Fu Yun , Wang Qiu Shi , Li Dong , Lin Lin
Published: October 2012

Radiant floor heating as a new type of energy-saving heating method has more and more used in modern building heating project. According to the different heat source, radiant floor heating is divided into low temperature hot-water floor radiant heating and electrical floor radiant heating. This paper analyzes the heat transfer process of structure layer of the low temperature hot-water and electrical floor radiant heating system, establishes two dimensional steady heat transfer mathematic model, numerical calculation using Fluent software. Respectively simulated when floor materials is different, the heat transfer process of low temperature hot-water floor radiant heating and electrical floor radiant heating system, The analysis results show that: for low temperature hot-water floor radiant heating, when floor material is soft wood, the ground temperature distribution is more uniform; for electrical floor radiant heating, when floor materials is marble, the ground temperature distribution is more uniform; electrical floor radiant heating is more energy saving, and temperature distribution in the ground of floor using the constant heat flux electric heating mode is more uniform than which using the low temperature hot water heating mode.
Solving Transient Heat Transfer Problems by the Convolution Type Semi-Analytical DQ Method
Authors: Peng Jian She , Luo Guang Bing , Yang Liu
Published: October 2012

The convolution-type Gurtin variational principle is known as the only variational principle that is, from mathematics point of view, totally equivalent to the initial value problem system. In this paper, the governing equation of bars is first transformed to a new equation containing initial conditions by using convolution method. Then, a convolution-type semi-analytical DQ approach, which involves differential quadrature (DQ) approximation in space domain and an analytical series expansion in time domain, is proposed to obtain the transient response solution. The transient heat transfer examples show the proposed method is a very useful and efficient tool in transient heat transfer problems.
Numerical Simulation of Gas-Particle Turbulent Flow Using kg-εg -kp-εp-kpg-θ Turbulence Model
Authors: Zeng Zhuo Xiong , Xue Feng , Xu Yi Hua
Published: October 2012

kg-εg-kp-εp-kpg-θ turbulence model is proposed which considers particle-particle collision and gas-particle turbulence. This model includes turbulent kinetic energy equation, turbulent kinetic energy dissipation rate equation, particle pseudo-temperature transportation equation and the two-phase velocity correlation transport equation. To close the turbulence model, algebraic expressions of two-phase Reynolds stresses and two-phase velocity correlation variable are established which considered both gas-particle interaction and anisotropy. This model is used to simulate gas-particle in swirling sudden-expansion chamber. Comparing with kg-εg-kp-εp-θ model which is simply closed using a semi-empirical dimensional analysis, the present model has better predicted capability. It is shown that the present model gives simulation results in much better agreement with the experimental results than the kg-εg-kp-εp-θ model.
Improvement of Transductive Support Vector Machine and its Application to Enhance Antifreeze Heat Transfer Capability in Ground Source Heat Pump System
Authors: Yan Man Fu , Wang Jiu Hai
Published: October 2012

To solve the problem of enhancing the heat transfer capability of antifreeze mixture in a ground source heat pump system, the existing Transductive Support Vector Machine (TSVM) model was updated into an improved TSVM model. Also, a new method of mixed antifreeze heat transfer capability classification was given in the paper by analyzing antifreeze [1] heat transfer capability of the ground source heat pump system and applying the improved TSVM model.
Analytical Solution of Unsteady State Conduction Problem with Heat Source
Authors: Su Shun Yu , Huang Qin
Published: October 2012

Separation-of-variables method is one of the analytical solution methods to solve unsteady state heat conduction problems. But unsteady state conduction with heat source is an inhomogeneous problem. It can not be solved by separation-of-variables method directly. The combination of variables division method and separation-of-variables method was applied in this paper to deal with heat conduction with heat source in an infinite plate wall. The problem was divided to a steady state and inhomogeneous heat conduction problem, and an unsteady state and homogeneous heat conduction problem by variables division method. The steady state and inhomogeneous problem can be integrated directly. The unsteady state and homogeneous problem can be transformed to the problem that can be solved by separation-of-variables method directly through variable substitution. The unsteady state temperature field in the infinite plate wall was then obtained.
Study on Induction-Ventilation-Based Insulation Properties
Authors: Fu Jun Ping , Liang Zhi Hui , Tian Yu Fang , Li Jia Ci , Feng Yan Qiu
Published: October 2012

When exterior wall adopts solar chimney thermal channel, natural ventilation comes into being in the thermal channel, which plays the role of reducing the heat indoor. In this article, we use FLUENT to explore the heat transfer and flow quality of the solar chimney thermal channel in Changsha area in the summer. The research mainly studies how different thermal channel widths, inlet and outlet vent heighst and solar radiation intensities can impact on ventilation effect and further concludes the rules of thermal channel flow field and ventilation rate changing of the solar chimney.
Cause of the Floor's Crack in the Large Locks Built on Soft Foundations
Authors: Cao Zhou Hong , Lian Ji Jian , Xiao Zheng
Published: October 2012

The cause of longitudinal cracks on the top of the large locks built on soft foundations can’t be explained by general design methods. Based on the analysis of influence of foundation elastic rebound and concrete hardening on the response of elastic foundation beam, the paper thinks it is an important cause that designers ignore the above factors of the construction process, and considering the worst case, and suggests designers should ignore the affection of the lock floor’s deadweight when computing the negative moment.
Testing and Analysis of the Dynamic Parameters of 3D Reciprocating Compressor Foundation
Authors: Wan Xin Lin , Zhang Su
Published: October 2012

It is necessary to test dynamics parameters of foundations at construction ground of large-size dynamic machine base. This paper elaborate the test technology and data processing methods on the basis of the block forced vibration test with engineering example, and test results are analyzed and discussed.
A New ERR and Strategy for Bi-Directional Evolutionary Structural Optimization
Authors: Zhang Da Ke , Zhang Wen Pan , He Han , Wang Chong
Published: October 2012

The efficiency of the element removal or addition is of significance for evolutionary structural optimization (ESO) process. The key is to find an appropriate rejection criterion (RC) which allows to assess the contribution of each element to the specified behavior（stress, stiffness, displacement, etc.）of the structure, and to subsequently remove elements with least contribution. This paper proposed a varying elements removal ratio (VERR) method which uses a larger ERR (Element Rejection Ratio) value at early iterations where exist a lot of redundant material, and decreases the value of ERR in the optimal process to lessen the number of elements removed at later iterations. Meanwhile, this paper proposed a strategy for element addition based on stress level and the contribution of elements to the structure in order to decide which elements should be added to the model and the sequence of the element addition. With the proposed VERR and the strategy, the optimization procedure of the structure evolves more quickly and smoothly.
Test Study on Strength Characteristics of Unsaturated Silt
Authors: Qian Yu Lin , Wang Fei Yan , Li Xiao Wei
Published: October 2012

A series of consolidation and drainage unsaturated triaxial tests on remolded samples were carried out at controlled matrix suction and confining pressure through automatic GDS triaxial apparatus. According to the shear strength of unsaturated silt, the results show the matrix suction has a little influence on effective angle of internal friction, while has great influence on failure modes and cohesion. With the increasing of matrix suction, stress-strain curves translate from hardening type to softening type, the effective angle of internal friction changes a little and is approximately equal to the effective angle of internal friction of saturated soil, cohesion is significantly improved. Matrix suction friction angle is not a constant, when the matrix suction is less than 100kPa, it decreases with matrix suction increasing, the rate of decrease reduces gradually; when matrix suction is greater than 100kPa, it tends to be a fixed value. The results are consistent to modified strength theory proposed by Fredlund.
Experimental Research on Interface Mechanic Behavior of the Composite Steel-Concrete Beams
Authors: Fu Guo
Published: October 2012

Experiments were conducted on 7 simply-supported composite steel-concrete beams (SCB) with compact steel sections to investigate their interface mechanic behavior. The influences of different loading mode, degree of shear connection and stud arrangement are discussed. The test process, specimen failure matter and uplift distribution along the span of the beam are analyzed. Based on the experimental research, the formulae are derived for the interface slip and uplift rigidity of the stud in composite steel-concrete beams. The present values bench-mark finite element analysis of load bearing capacity and deflection of composite steel-concrete beams.
The Effect of Boundary Conditions on Simulation of Horizontally Homogeneous Atmospheric Boundary Layer
Authors: Yang Xiang Long , Huang Zhong Wei , Yang Lei
Published: October 2012

The Influence of six kinds of combinations of different boundary conditions on the maintenance of homogeneity of atmospheric boundary layer in computational wind engineering was investigated. The inlet condition was applied by either prescribing velocity and turbulent quantities or using a periodic boundary. The top boundary condition includes symmetry, prescribing velocity and turbulent quantities, constant static pressure and applying driving shear stress. Numerical results show that the stream-wise velocity and the turbulent dissipation rate are almost immune to boundary conditions, but the turbulent kinetic energy is affected by boundary conditions dramatically. Best maintenance can be obtained by using periodic boundary condition at inlet and outlet and applying driving shear stress on the top of the domain.
Fracture Splitting Mechanism of Jointed Rock Mass under Compressive-Shear Stress and Grouted Pressure
Authors: Jiang Xue Liang , Yang Hui
Published: October 2012

The cracking and propagation regulations of compressive-shear rock cracks and the evolution regulations of the stress intensity factor at the branch crack tip under the grouting pressure were discussed in this article. The fracture failure mechanism of rock bridge in the compressive-shear stress state under the effect of grouting pressure was also studied and a fracture failure criterion was put forward. The fracture failure criterion was applied to a example and some useful conclusions were drawn. The grouted pressure and the lateral stress are the key factors which remarkably effect the stress intensity factor KI at the branch crack tip when the certain axial stress and friction coefficient is known. The larger grouting pressure and the smaller value of the lateral stress result in the larger the initial stress intensity factor KI at the branch crack cusp.Under the certain stress and friction coefficient, the higher grouted pressure and lateral tension stress together is easier to lead to crack transfixation. A new way was offered which studied the fracture transfixation of fractured rock mass in the interaction of grouting pressure field and stress field.
Time-Domain Dynamic Analysis for Dynamic Positioning System of Deepwater Semi-Submersible
Authors: Sun Li Ping , Cai Shu Long , Chen Jing
Published: October 2012

Semi-submersible plays an important role in ocean oil and gas exploitation. This paper carried out some researches for the dynamic positioning system (DPS) of a deep water semi- submersible. Mathematic modal was made, and a special program was created with M-language for the time-domain dynamic analysis of the dynamic positioning system of the deep water semi-submersible, on basis of the mathematic modal. PID control strategy, kalman filtering theory and optimal thrust allocation method were used in the analysis. Simulation result indicated the DPS of this platform is safe and efficient.
A Perturbation Procedure for Limit Cycle and Heteroclinic Connection Analysis of Certain Self-Excited Oscillator
Authors: Chen Yang Yang , Zhao Wei , Yan Le Wei
Published: October 2012

A perturbation procedure, in which the elliptic perturbation method and the hyperbolic perturbation method are applied, is presented for predicting heteroclinic connection of limit cycle or self-excited ocsillator. The limit cycle can be analytically　constructed first by the elliptic perturbation method after Hopf bifurcation, in which the amplitude of limit cycle can be　controlled by the modulus of elliptic functions. The heteroclinic trajectories, which are formed by the heteroclinic connection of limit cycle, can also be constructed by similar perturbation　procedure but adopting the hyperbolic functions instead of　elliptic functions. And the criterion of heteroclinic connection is given in the perturbation procedure. A typical self-excited oscillator is studied in detail to assess the present method.
Nonlinear Analysis for Bending Cross Section of Tensile-Compression Prestressed Concrete Beam
Authors: An Jing Bo
Published: October 2012

In this paper, based on the deformation of bonded tensile-compression prestressed concrete beam, the nonlinear analyses are presented about whole loading process of tensile-compression prestressed concrete beam by internal force equilibrium and deformation compatibility of cross section. Then the M-f computation programs are developed, and the computational results are consistent with that of test. Finally, the ANSYS programs are used to analyze and test the computational results from M-f computation programs. Research findings in this paper provide a basis for further study of tensile-compression prestressed concrete.
The Application of Vibration Testing in Jinaozhou Pagoda Protection
Authors: Deng Hui , Peng Jin Biao
Published: October 2012

The dynamic behavior is an important index to evaluate the seismic property and structure damage of historic pagoda. On the base of the research of protection technology on Jinaozhou pagoda, the key points and schemes for applied ambient random excitation technology to determine the dynamic behavior of ancient masonry pagodas is introduced. Test results obtained are ideal, and obtain some datas that are beneficial to Jinaozhou pagoda preservation through comparison of test results during four years. It is believed that the present research can provide a valuable reference for the eternal protection, reasonable development and utility & Long-term health monitoring of similar ancient pagodas.
The Experimental Study on Mechanical Behavior of Concrete Composite Beam with Detaching-Free Template
Authors: Wang Qing Hua , Dong Jia Zhu , Tian Jin Feng
Published: October 2012

This paper puts forward that we can make glass fiber enhanced detaching-free template by using GRC composite materials, steel wire and other materials.In the construction,concrete beam and template form "Template /concrete" composite structure, which can make GRC template as a permanent structure bearing the stress together with concrete beam. Through the contrast test analysis and research of different treatments composite beams ,we can know the mechanical behavior and cooperative working performance of different composite beams.
Experimental Study on Mechanics Properties of CFRP-PCPs Composite Rebars under Uniaxial Load
Authors: Liang Jiong Feng , Yi Ping Hua , Li Jian Ping
Published: October 2012

The mechanics properties of CFRP-PCPs composite rebars under uniaxial load was studied by experiment. The results showed that the application of a reasonable amount of prestress to the prisms can limit service load deflections and crack width to acceptable levels, using CFRP-PCP composite rebars as reinforcement utilizes high strength of FRP effectively, reducing the reinforcement ratio and consequently the cost while simultaneously satisfying structural requirements.
Experimental Study of Deformation Characteristic and Application on External Prestressed Wooden Beam
Authors: Zhang Ji Mei , Pan Jing Long , Dong Hong Bo
Published: October 2012

People have widely uesd long- history wooden buildings in the ancient and mordern architecture.But the modulus of elasticity of the wood is smaller as well as the fact that the stiffness of wood is lower. In order to solve the problem of deficiency of the stiffness of large-span wooden beam from the practical engineering, this paper presents the method of external prestressed wooden beam, and the calculation method of deflection of wooden beam through model test of 1:2 scale. In addition to it, the paper also analyzes the factors which affect stiffness of wooden beam. The result shows that stiffness of this kind of wooden beam is greatly improved compared with the common wooden beam in the same cross section. Steel has a predominant tensile characteristics, it is an effective method to reduce undue deflection of large-span wooden beam by external prestress method. This construction techniques has greatly applicational value in the reinforcement and strengthening ancient buildings and modern design and construction of large-span timber structure buildings and bridges.
Fourier Analysis of the Effect of Non-Constant Terms on the Convergence Properties of SIMPLE Algorithm Formulated on a Staggered Grid
Authors: Wang Fei , Zheng Li , Li Yi Tian
Published: October 2012

The Fourier analysis is employed to study the effect of non-constant terms on the convergence properties of SIMPLE (Semi-Implicit Method for Pressure Linked Equations) algorithm formulated on a staggered grid in two-dimension. The results indicate the non-constant items can broaden the convergence range of pressure relaxation factor for a given velocity under-relaxation factor. What’s more, the non-constant items do well to the damping of the lowest error and can accelerate the convergence rate.
Measurement Method in Model Test of Ice Breaking by Air Cushion Vehicle
Authors: Zhang Zhi Hong , Wang Chong , Gu Jian Nong , Miao Tao , Wang Lu Feng , Sun Bang Bi
Published: October 2012

A high accuracy non-contact laser displacement measuring system is developed to obtain the surface deformation of the ice-like material. A speed measurement and positioning system is established for the moving air cushion load. The mechanical properties of the ice-like material and the pressure distribution of air cushion load are measured. Under different air cushion load and different speed, a series of experiments of the deformation of ice-like material are carried out in towing channel which the depth of water is variable. The maximum deformation of ice-like material can be caused when air cushion load moves at critical speed, and the ice-water resonance mechanism of ice-breaking by air cushion is revealed, which provides the basis of ice-breaking for practical air cushion vehicle.
Vertical Load Mechanism Analysis and Experimental Research on Super-Long PHC Pipe Pile in Soft Clay
Authors: Zhou Li Jun , Lu Ziai , Wang Wen Juan
Published: October 2012

Pile foundation design has gradually used the super-long pile structure form with the port and offshore engineering construction developing towards to the direction of large-scale, deepwater, and coast geological becomes more complex, bearing stratum becomes more deeper. PHC pile is the first choice of pile foundation design form, just because it has many advantages. The former researches of pile vertical load mainly on limit bearing capacity, the calculation is reasonable for short pile and middle long pile, however, it is not reasonable for super-long pile, pile body side and tip resistance can not reach the limit when structure is to limit. This paper puts forward the calculation model of super-long PHC pile vertical load in soft clay based on vertical load mechanism analysis and experimental research on the foundation pile, and the calculated and test value coincide preferably.
FEM Research on Deepwater Risers Installation
Authors: Liu Hong Xin , Ding Xiao Jie
Published: October 2012

Deepwater risers play an important role in the exploration and production of oil and gas. Research of deepwater risers’ installation is so important in the field. This paper proposed a riser FEM models by commercial software ABAQUS, and then, the calculation result is analyzed and main conclusion are obtained.
Research on Characteristic Properties of Gray Level Co-Occurrence Matrix
Authors: Chen Ying , Yang Feng Yu
Published: October 2012

Gray level co-occurrence matrix (GLCM) is a second-order statistical measurement. In order to understand the characterization degree of GLCM’s different feature properties, we use images of Brodatz texture images as experimental samples, analyze the change process of feature properties in horizontal, vertical and principal and secondary diagonal directions under the situation of some elements’ dynamic changes such as distance of pixels pair, size of moving window and gray level quantization,. By analyzing the experimental results, this paper can provided certain referential significance in how to select feature properties reasonable in the application of image retrieval and classification and identification which are based on using GLCM as feature.
Prediction of Dynamic Deformation Monitoring Based on IGA Artificial Neural Network Model
Authors: Zhu Yu , Zhao Qing
Published: October 2012

Dynamic deformation data analysis and prediction is a complex systematic project. Aimed at the shortcoming of the traditional prediction model, a method to design the BP neural network based on Immune Genetic Algorithm(IGA) was proposed. The mechanisms of diversity maintaining and antibody density regulation exhibited in a biological immune system were introduced into IGA based on genetic algorithm. The proposed algorithm overcame the problems of GA on search efficiency, individual diversity and prematur, and enhanced the convergent performance effectively. The results show that the BP neural network designed by IGA have better performance in convergent speed and global convergence, and the forecasting accuracy is improved, which illustrates IGA-BP neural network has certain of value on dynamic deformation monitoring forecasting.
Development of Conversion Program from ETABS to ABAQUS
Authors: Li Jia Cheng , Ji Jing , Yuan Yi Xin
Published: October 2012

ETABS has a powerful 3D modeling platform and ABAQUS provides an efficient explicit solver. By combining the advantages of ETABS and ABAQUS, this study found the difference in their model data files and used the MATLAB software to compile the conversion program, which can directly convert the ETABS models to ABAQUS. Finally, by comparing the calculated results of different analysis software, it is found that the calculated results were basically the same and the conversion process was correct.
Effects of Load Type on the Mechanical Properties of the JLU Series Lunar Soil Simulant
Authors: Li Jian Qiao , Shi Rui Yang , Zou Meng , He Ling , Yang Yan Jing , Li Hao
Published: October 2012

The pressure-sinkage characteristics and the shear-strength characteristics of lunar regolith are the important influence factors to the trafficability of lunar rover. The performance curves and parameters of JLU luanr soil simulant were obtained by pressure-sinkage tests and shear-strength tests in the ground gravity-environmental load (1g) and the lunar gravity-environmental load (1/6g). The results show that, for the pressure-sinkage characteristics, the compression-strength of the JLU-1 is strongest, followed by the JLU-3, and the JLU-2 is the weakest. In different load levels, the deformability index n increases as the bulk density increases. The kc increase as the state becoming more and more compact,The k of JLU-1 is the largest of all, followed by JLU-3 next, JLU-2 has the smallest.The load levels have no significant effect to the tendency of n, kc and k. For the shear-strength characteristics, the shear resistance of JLU-2 is the weakest. JLU-1 has the greatest cohesion c of the three lunar soil simulant, followed by JLU-3, the c of JLU-2 is the smallest.The c of the same lunar soil simulant in natural state is greater than it in soft state. Compared with JLU-1 and JLU-3, JLU-2 has the smallest internal friction angle .The influence of the load levels to the the cohesion c internal friction angel is not obvious. The  mesured in the lunar load is wider than it in the ground load. This study will supply fundamental reference and foundation on the research and optimization of the lunar rover traveling mechanism in the authentic lunar environment.
A Heterogeneous Strategy Genetic Algorithm and its Application in Dynamic Optimization of Structure
Authors: Yan Le Wei , Chen Yang Yang
Published: October 2012

Heterogeneous strategy is used to improve genetic algorithm. It can increase the population diversity and avoid premature while the convergence efficiency is ensured. Furthermore, an expression to estimate the extent of inbreeding and two methods for selecting heterogeneity were given, and, an improved generalized genetic algorithm was presented in this paper. This algorithm is used for multi-parameter dynamic optimization of the structure which is under random loads and has stress constrains. Numerical examples demonstrated that heterogeneous strategy can improve the probability of convergence to global optimal solution and the improved generalized genetic.
The Turbulent Flow Model Selection for Numerical Wind Tunnel Simulation of the Low Layer Double Slope Roof
Authors: Wu Jian Feng , Wang Cai Hua , Zhao Yan Chao
Published: October 2012

Using the FLUENT software, this paper taking the current code for the design of building structures as the comparison standard, have numerical wind tunnel simulation of the wind the surface wind pressure on low layer double slope roof. It focuses on the analysis of the effects of turbulence model selection on the numerical simulation results, such as Spalart-Allmaras、Standard k −ε、RNG k −ε、Realizable k −ε、Standard k −ω、SST k −ω and RSM, to provide a basis for the reasonable selection of turbulence models.
A Further Study on Soil Slope Stability Analysis by Finite Element Slip Surface Stress Method
Authors: Li Hong Jun , Zhang Yan Yi , Yan Zu Wen
Published: October 2012

In this paper, it proves that the necessary and sufficient condition for the potential sliding body reaching the ultimate limit equilibrium state is that the summation of shear stresses along the sliding surface equals to that of resistant shear strength. Based on the rigorous theory analyses and derivations, it is clearly shown that the definition of factor of safety (FOS) in the slip surface stress method (SSSM) is irrelevant with the shape of slip surface. Thus, the authors demonstrate that the FOS of noncircular slip surface can also be defined as the ratio of the sum of resistant sliding force along slip surface to that of sliding force. Furthermore, the physical meaning of the FOS in the SSSM, which can be taken as the average evaluation of the strength reduction coefficient that makes the sliding body reach the ultimate limit equilibrium state along the slip surface in nature, is formulated on the basis of strength reserving theory rather than the overloading theory like that in the Limit Equilibrium Method (LEM) and the Shear Strength Reduction Method (SSRM). Finally, the factors of safety (FOS) and the locations of critical failure surfaces obtained by the SSSM, LEM and SSRM are compared for various geotechnical practices. It is found that the SSSM can achieve precise and reasonable stability assessments for the soil slopes on the basis of actual stress field. Consequently, compared with the LEM and SSRM, the SSSM is demonstrated to be effective and efficient alternative approach for routine analysis and design in geotechnical engineering practice with a high level of confidence.
Classical Models and its Applications in D-S Evidence Theory
Authors: Du Yuan Wei , Han Chen
Published: October 2012

D-S evidence theory is a theory of dealing with uncertain information which was empowered by Dempster and expanded by Shafer. However, as a theory founded in 1970s, D-S theory is invalid when there has conflicts between evidences. This papal reviewed classical models and applications of D-S evidence theory. These models revised the shortcomings of D-S theory and put forward some new methods. The applications of D-S theory involved decision-making, information fusion and many other fields.
The Application of BP Neural Network on Research of DO Influence on Fluidized Bed Step-Feed Process
Authors: Wang Bing , Zhang Ji Ku , Li Ya Feng , Li Jun
Published: October 2012

Based on large amounts of datas, BP neural network model was applied to studying the DO influence on fluidized bed step- feed process. The output values and the actual values reached a high fitting degree. The fitting degree of NH4+-N was 0.979 and TN of 0.965. So BP neural network model could be used as a new type analysis method in water treatment. It could predict operating results under other conditions without experimental measure.
Stability Evaluation to Mined-Out Region
Authors: Peng Li Ying , Zeng Yu Ying , Su Gui Cheng
Published: October 2012

Combined with the collected mining conditions and geological characteristics of coal mine mined-out areas, this paper analysed the present collapse situation of the coal mine mined-out area, the mechanism and influence of the surrounding environment. It puts forward the comprehensive analysis model considering multiple factors. And corresponding conclusions could provide theoretical guidance for urban planning, construction and sustainable development research.
Study on the Frost Heave Characteristics of Artificial Frozen Soil Under Different Freezing Mode
Authors: Chen Jun Hao
Published: October 2012

At the self-developed DZL-001 computer control of frozen soil frozen-heave test machine, use artificial freezing method carry out vertical and lateral freezing two modes frost heave test of remoulded clay, each mode test includes under no replenishment and replenishment conditions. Monitor the temperature, moisture and frost heave of frozen soil at different location. Compare the similarities and differences of frost heave characteristics of two modes, master the frost heave characteristics of artificial frozen soil. The results provide a certain guidance and reference meaning to layer sidewall structural design.
Determining Range of Saturated Ground around Leakage Pipeline Using Unsteady Seepage Numerical Analysis
Authors: Li Xing Gao , Duan Chao Jie
Published: October 2012

It is of great significance to estimate the range of saturated ground around leakage pipelines when tunneling near the pipelines. The range of saturated ground can be determined from the distributions of the water content and pore-water pressure in ground around the leakage pipelines. The leakage pipeline being modeled as an injection well, a series of unsteady seepage numerical analysis is performed to understand the effects of the internal water pressure of pipelines on the range of saturated ground surrounding the pipelines, and computation results show the exponential relationship between them. In the unsteady seepage analysis, the hydraulic conductivity function and the volumetric water content function must be determined beforehand to get reasonable results of the range of saturated ground.
Analysis of Collapsible Loess Microstructure at Fractal Theory Based
Authors: Shi Ming Yuan , Chen Zong Fang , Zhang Hong Yan
Published: October 2012

On the basis of publicized data, the fractal character of pore structure in loess is studied. We have determined fractal characteristic pore radius and discussed the relationship between fractal character values and collapsibility. Results show that there is a good linear relationship between and collapsibility, and fractal dimension can reflect geological age of loess section.
Research on Earthwork Calculating Methods Based on 3D Laser Scanning Technology
Authors: Zhou Bao Xing , Yue Jian Ping , Li Jin
Published: October 2012

Terrestrial laser scanner (TLS) can provide the measurement of a large number of physical points distributed on the observed surface. A fast earthwork calculating method is proposed based on the redundant number of acquired points, which leads to a very accurate and high resolution reconstruction of the observed surfaces. This paper describes the three main steps of the method, namely the acquisition of the earthwork data based on TLS, the pre-processing of point cloud data, the earthwork calculation and accuracy evaluation based on point cloud data. Furthermore, it illustrates the performance of the proposed method with a validation experiment.
The Influence Analysis of Groundwater Environment on the Strength of Cement-Stabilized Soil
Authors: Lv San He , Dong Meng Rong , Yang Jun Jie , Miao Jia Li
Published: October 2012

To measure the applicability of the cement mixing method in the reinforcement of soft clay in Jiaozhou Bay, laboratory test of cement-stabilized soil with different mixture ratio are conducted. We take fly ash as additive and have studied the influences of the cement types, cement content, additive content, soaking time and other factors on the cement-stabilized soil strength under the groundwater soaking condition. This paper demonstrated a link between the above factors and cement-stabilized strength.
Direct Shear Responses of Insulated Concrete Sandwich Panels with GFRP Shear Connectors
Authors: Yun Hyun Do , Jang Seok Joon , You Young Chan
Published: October 2012

This paper investigates shear flow strength of insulated concrete sandwich panels with glass fiber reinforced polymer (GFRP) shear connectors based on push-out test. The precast insulated concrete panels consist of 60mm concrete wall, 100mm insulation, and 130mm concrete wall. Two concrete walls were connected with GFRP corrugated shear connector. Four specimens with variables such as the insulation type and the width of GFRP corrugated shear connector were made. Failure modes, shear flow-deflection relationships and post-peak strength were investigated. Test results indicate that the specimens with EPS insulation show higher shear flow strength than those with XPSS insulation due to the relatively high surface roughness of EPS insulation, and the shear flow strength increased with increasing shear connector width.
Virtual Power for Solving the Displacement of the Curved Bar
Authors: Tang Yan Fang , Zhang Yong Sheng
Published: October 2012

In this paper, the principle of virtual work to solve the structural displacement, summed up the different types of arc curved bar under different load displacement, which lay the foundation for displacement of the curved bar after the project encountered solving .
Space Simulation for Pier-On Mass of Pre-Stressing Box Girder at Earlier Hydration Age
Authors: Zhang Gang , Wang Cui Juan , He Shuan Hai
Published: October 2012

Being aimed to the earlier temperature crack phenomenon of pier-on mass for concrete box girder during construction caused by hydration. Based on the real engineering, time-dependent effect of concrete density, specific heat and heat conductivity were comprehensively considered, hydration heat attack model was proposed, element birth and dead technique and sub-model technique was adopted to analyze hydration heat temperature field of pier-on mass for pre-stressing concrete box girder. The results indicated that hydration heat attack model is practical, hydration heat temperature at the copulation location of web plate and upper plate and floor plate as well as cross plate is 75°C, gradually decreased from the inner layer to the outer layer; birth and death technology and sub-model technique of element is effective to simulate the layer-cast for pier-on mass of concrete box girder.
A New Foundation Countermeasure in West Antarctica Peninsula Area
Authors: Xiang Wei Ming , Jiang Peng , Zheng Xian Chang
Published: October 2012

Because of the extremely adverse climate environment and construction conditions, the previous buildings in each South Pole Station in west Antarctica area turned up a series of foundational morbidities. I had been to Antarctica as a member of the 21st Chinese National Antarctic Research Expedition Team in 2004, in charge of a program about building suitability. This paper recommended the geological conditions, the subterraneous temperature field and the emerged foundational morbidity in West Antarctica Peninsula Area, eventually expounded a new foundation measure.
Test Study on Bearing Behaviors of Piles Considering the Influence of Caves
Authors: Huang Sheng Gen , Cao Hui
Published: October 2012

Based on the static load tests and stress tests results of two cases in Karsts area, the bearing behavior of piles were analyzed and compared in this paper, caves in the base of piles not only affect the base resistances, but also affect the frictions of piles. The finite element method was applied to analyze the influence of rocks in the base of piles on bearing capacities of piles, according to the calculated results; the modulus of rocks affects the bearing capacities greatly, bearing capacities increase with the modulus of rocks increasing.
Determination of the Average Wind Pressure of Circular Flat and Saddle Roof Building Based on the Numerical Wind Tunnel Method
Authors: Wang Cai Hua , Li Hui Jian , Wu Jian Feng
Published: October 2012

For numerical wind tunnel method has the advantages of low cost, fast speed, the more comprehensive results, the paper using CFD knowledge and the FLUENT software, using RSM turbulence model, SIMPLE algorithm, simulation class D landform, to have numerical simulation of average wind pressure coefficient for of the circular planar and saddle roof building ,which the current code for the design of building structures did not give, to provide reference for determining the average wind pressure coefficient of the circular planar and saddle roof building .
Temperature Field Analysis of Space Grid Structures
Authors: Wang Guang Yong , Wang Na
Published: October 2012

A heat transfer finite element model for the temperature analysis of space grid structures considering the conduction and protection thickness of the steel members in fire is proposed, and the temperature field of a typical grid structure is analyzed by using the proposed model. The results show that the proposed model is reasonable.
The Typical Methods of Using Section Steel Reinforced Concrete Beams and Slab
Authors: Li Xiu Hua , Wang Cheng Wu , Yue Chen Xi , Cai Jiang Dong
Published: October 2012

The technology of Concrete beams and slab reinforcement is one of the key technologies of reinforcing and reusing existing buildings. There are many ways of reinforcement on the components and there are also some relevant state regulations. Take the carbon fiber sheet reinforcement technology as an example. It is mainly used to improve the bearing capacity of concrete, but plays limited role in improving the stiffness of concrete. When the changes in the load of industrial buildings are relatively large, it is difficult for this approach to achieve the purpose of reinforcement. While using section steel reinforced concrete slab can not only improve the bearing capacity of beams and plates, but also significantly increase the stiffness of beams and slab. The paper by introducing different methods of section steel reinforced concrete beam, beam end bearing and slab, the essay shows the improvement that a variety of reinforcement methods have made on bearing capacity and stiffness, and points out the precautions during the construction, which provides a reference for engineering applications.
The Ultimate Strength of the Concrete-Filled Tubular (CFT) Section Columns
Authors: Kwon Young Bong , Jeong In Kyu , Kwon In Kyu
Published: October 2012

This paper describes design strength of concrete-filled tubular (CFT) section columns accounting for local buckling of steel skin. The local buckling has a negative effect on the ultimate compression strength based on the yield stress of steel skin and nominal compressive strength of in-filled concrete. A squash load formula for CFT stub columns is proposed to account for the post-local-buckling strength of steel skin. A compressive strength formula for filled-in concrete accounting for the confining effect of steel skin and strength ratio between filled-in concrete and steel skin is also proposed. The squash loads predicted by the proposed strength formula for the direct strength method were compared with the AISC (2010) and Eurocode4 (2004). The comparison showed that the squash load formula proposed can predict conservatively the squash load of circular and rectangular CFT columns with local buckling
Study of Ultrasonic Wave Propagation Characteristics in Multilayer Bonded Structures
Authors: Ai Chun An , Liu Yu , Xu Zhi Gao , Li Jian
Published: October 2012

The reflection and transmission coefficient equations in multilayer bonded structures have been achieved by improved global matrix algorithm. The change of bonded strength have been simulated by the change of shear velocity in bonded layer.The curve between reflection coefficient and angle of incidence in immersion and plane ultrasonic longitudinal wave have been calculated in different bonding strength and the same frequency. The emulational graph had been compared and analyzed. The quantitative test of bonding strength and orientation of poor bonded district have been implemented. The conclusion can provide theoretic guidance for experimental research of bonded strength.
Impact of Environment Temperature Reduction on Force Performance of Steel Silos
Authors: Sun Yue Dong , Wang Yan Pu
Published: October 2012

Based on the engineering case of a steel silo used for storage cement, the circumferential stress and axial stress of steel silo wall was carried out by ANSYS, when environment temperature falls. Result shows that the impact of environment temperature reduction on the silo wall circumferential stress is significant while the impact on axial stress is small. Circumferential stress increase about 21MPa and axial stress increase 4.1MPa when the environment temperature falls 10°C.The impact of temperature reduction should be taking into account in the design of steel silos in cold area.
Numerical Simulation of the Influence of Weld Model on the Response of Stiffened Plates under Blast Loading
Authors: Zhu Xin Ming , Zhan Hao , Jiang Zhi Gang
Published: October 2012

Stiffened plates are used in a wide variety of engineering structures. Based on the published experiments, two kinds of weld models were established in simulation and the influence of weld model on the response of stiffened plates under blast loading was analyzed. The results show that the deflections and failure modes of stiffened plates from simulation are in good agreement with those from experiments, and that the weld model has little influence on the deformation and the critical charge of the plates. A simple model can be used for analyzing the large stiffened structures under blast loading.