bluuebunny/crossref_metadata_2025 huggingface dataset:
Conceptual Design and Hydrodynamic Analysis of a High-Speed Deformable Trimaran
Authors: Yan Hong Sheng , Xu Xiao Ying , Feng Yan Xin
Published: October 2012

This paper proposed a new high-speed deformable trimaran based on DTMB5415, and discussed its advantages and applications. We computed the hydrodynamic performance with CFD method and analyzed the wave-making interference and resistance performance for eight different arrangements of this trimaran. The results show an optimal layout for this high-speed deformable trimaran, which can decrease the resistance of per unit displacement mass about 32%.
The Application of Table Operations Method in Earthwork Blending
Authors: Wan Hong Hao , Xu Ting Hua
Published: October 2012

According to linear programming model of operations research, the paper optimized blending scheme of earthwork by using table operation method. List the earthwork cut and fill balance sheet, through the calculation of excavation and backfill area quantity. Determine the initial transportation scheme with minimum element method, and optimize the scheme with closed circuit method, then get the minimum amount of earthwork blending scheme. It could bring better economic benefits in construction projects by using the table operation method.
The Increasing of Interface Slip and its Effect on Composite Beams when there Are Cracks in Brittle Material Element
Authors: Gu Qing Hua , Ni Xin Hua , Ma Ying Chen , Cheng Zhao Gang
Published: October 2012

The composite beam is composed of the brittle material element and ductile material element (for example: concrete and steel), and with shear connectors it decreases the slip between the brittle material element and ductile material element, and ensures the coordination and integrity of the cross section. When there are cracks in brittle material element in use, it will increase interface slip. In this paper, we assume that the brittle material has cracks, and calculate the slip of shear connectors. Letting the end slip equal to the ultimate slip of shear connector, the shear force and ultimate moment of composite beam is gotten.
Test on Eccentricaly Loaded Four-Tube Concrete-Filled Steel Tubular (CFST) Laced Columns of No Yield Point
Authors: He Ran , Shu Xing Ping , Chen Bo Wang
Published: October 2012

In order to study the characteristics about deformation and stress of four-tube concrete-filled steel tubular(CFST) laced columns of no yield point, a test with the parameter of eccentricity on two our-tube concrete-filled steel tubular(CFST) laced columns of no yield point has been finished by means of 500t press. The results of the test shows that the larger the eccentricity, the more obvious the global deformation of laced columns tends to become, and the four-tube CFST laced columns of no yield point under eccentric compression were subjected to overall bending failure and ductile failure with obvious premonition; In the meanwhile, confinement effect of main tubes away from the loading point of laced columns under eccentric compression was inapparent , while confinement effect of the two main tubes close to the loading point begain to play and increase before it was to fail, which made the characteristics about deformation and stress of the the two main tubes close to the loading point similar to the single CFST column under axial compression.
Identification of the Nonlinear Vibration Characteristics Based on the Wiener Kernels
Authors: Ren Yi Chun , Yu Yin Hua
Published: October 2012

Wiener series are the important functional series describing nonlinear system. If an input signal is the Gaussian white noise, the wiener kernels are estimated through calculating the cross-correlation functions of the input and output of a nonlinear system. In this paper, a single-DOF quadratic nonlinear system is identified by the Wiener series. The results show that the intensity of the nonlinear response can be expressed by the second-order kernel.
Effect of Impurity Content on Elastic Modulus and Poisson Ratio of Salt Rock
Authors: Zong Xian Lei , Yang Chun He , Zuo Jiang Jiang , Xu Jing Bin , Ji Guo Dong
Published: October 2012

The basic features of salt rock in China are as follows: thickness single layer, more layered distribution and impurities and others. The unstable mechanical parameters are caused by the different types and content of minerals in natural salt rock. Elastic modulus and Poisson ratio of natural samples from certain northern area in China which are compressed under different confining pressure is then analysed with the impurity content to get the relationship between them. Comparing the experimental values with the predicted calculated by Mori-Tanaka method, a linear estimation formula is proposed for the prediction of mechanical parameters suitable for practical engineering applications in this area.
The Trajectory Planning of Robotic Operation Simulation Based on Virtual Reality
Authors: Dong Hui Ying , Sun Qi Hua , Lu Xue , Liu Zhang Ming
Published: October 2012

At present, robot simulation based on virtual reality is a hot spot in the study of the robotic. We can build more intuitive and efficient and realistic simulation environment of processing of the robot through combining computer technology and virtual reality technology to carry out a more effective human-machine interactive operation. Robotic trajectory planning is not only the basis of trajectory tracking control, but also the implementation of tasks in robotics. It is discussed trajectory planning and path generation based on robot kinematics and dynamics in the joint space and Cartesian space. In this paper, we study the robot trajectory planning and use three B-spines fitting the robot path in Cartesian space.
A Tapering Method in the Construction of Covariance Regularization
Authors: Wang Shi Qing , Song Fei Xia
Published: October 2012

Estimation of Population covariance matrix from samples is important in a wide range of areas of statistical analysis. In the estimation, the sample covariance matrix, which is the most natural and standard estimator, often performs badly. With the collection of large high-dimensional data in scientific investigation, the related covariance matrix becomes complicated to deal with. Therefore, for the convenience in computing and analyzing, we need to simplify the covariance matrix. This method is referred as regularization. In this paper, we will consider a proof for a construction of covariance regularization by tapering.
Parameters Identification of Dual-Rate Hammerstein Systems Based on Finite Input Response Models
Authors: Qin Ke , Chen Jing
Published: October 2012

This paper studies the parameter estimation for dual-rate Hammerstein systems. The finite input response model is used to approximate the dual-rate Hammerstein systems, and a recursive least squares algorithm is derived to estimate the parameters of the finite input response model. Based on the estimated parameters, the origin parameters of the dual-rate Hammerstein systems can be obtained. An example is provided to show the effectiveness of the proposed method.
Business Procurement Software Application for Project of Universal Studio of Singapore
Authors: Li Li Hua
Published: October 2012

Project procurement management is the substantial basis of engineering project and also critical about executing project process. Three points should be concerned which are basic program for procurement work: full workflow, cost consciousness and superior suppliers to achieve procurement management by business software.
Digital Image Measurement Technology for High-Rise Structure Torsion Deformation Measuring
Authors: Huan Shi , Xu Chong , Fan Xu Qi , Cheng Zheng
Published: October 2012

In the field of structural health monitoring, digital image measurement as a new monitoring technology is gradually being widely used. Real-time measurement for the torsion, however, has been the difficulty in the high-rise structure monitoring. This paper first analyzes the factors that caused the structure’s torsion and introduced the principle, but also the working mode of this new image measurement system, then a measuring scheme for high-rise structure’s torsion has been proposed, which indicates that this measurement technique is an effective new method.
Research on Numerical Integration Algorithm for MDOF Pseudo-Dynamic Test
Authors: Guo Xin , Zhu Li Hua , Wang Tian Li
Published: October 2012

This paper focuses on two integration algorithms used for pseudo-dynamic test, explicit Newmark algorithm and implicit alpha-C algorithm. The comparison study between the test and simulation results shows that: the non-uniform distribution of mass, restoring force characteristics and higher frequency vibration modality are simulated more accurately using the alpha-C algorithm than using explicit Newmark algorithm. The alpha-C algorithm also leads to high iterative accuracy and unconditional stability. Replacing the explicit Newmark algorithm in original experimental system by implicit alpha-C algorithm, the MDOF pseudo dynamic test system can be realized successfully.
Structure Optimal Design for Portable Exoskeleton Using Improved Particle Swarm Optimization
Authors: Liu Fang , Cheng Wen Ming , Zhou Yi
Published: October 2012

Portable exoskeleton is directed at providing necessary support and help for loaded legged locomotion. The kernel of whole mechanical construction of the exoskeleton is lower extremities. The lower extremities consist of exoskeleton thigh, exoskeleton shank, hydraulic cylinder and corresponding joints. In order to find the optimal combination of design parameters of lower extremities, an improved particle swarm optimization algorithm based on simulated annealing is proposed. To improve global and local search ability of the proposed approach, the inertia weight is varied over time, and jumping probability of simulated annealing is adopted in updating the position vector of particles. Experimental results show that the improved algorithm can obtain the optimal design solutions stably and effectively with less iteration compared to the standard particle swarm optimization and simulated annealing; using ANSYS software build finite element model with the optimization result, then analyzes the strength of the model, these stress results verify the of accuracy of the improved particle swarm optimization.
Weibull Model Based on the Maximum Entropy Principle and its Applications on Elements Grade Distribution
Authors: Wan Li , Chen Peng , Hu Xu Yi
Published: October 2012

The distribution of metallogenic elements grade is an effective index for the quantitatively economical evaluation of mineral resources. We have defined the information entropy as a measure of randomness of metallogenic elements grade distribution, assumed its primary distribution is in an extremely random situation, and deduced the density function of the primary distribution based on maximum entropy principle. Considering the fact that elements concentration goes from a non-orderly state to an orderly one in the ore-forming process, we added restraint parameters to the primary distribution model, got a two-parameter Weibull distribution model with embedded fractal features, and then fitted metallogenic element's grade distribution of Ag-Cu-Pb-Zn from a mine in China. The results show that the Weibull model is more effective than a lognormal model to describe elements distribution, and should be applied more broadly than common lognormal models in geology discipline.
Integrated 3D Spatial Data Model of Object-Oriented Digital Landslide
Authors: Ma Da Xi , Liu Xiao Hong , Ma Li Wei
Published: October 2012

By analyzing the attributes of three-dimensional space data model, the integrated 3D spatial data adopts object-oriented method for digital landslide modeling. It achieves spatial data modeling for landslide geological entity. An experimental case is given to indicate the feasibility of this approach for spatial data modeling.
Load Distribution Calculation of Pile Group Using Artificial Bee Colony Algorithm
Authors: Su Guo Shao , Qian Kun , Zhang Yan
Published: October 2012

Artificial bee colony algorithm (ABC) is a newly swarm intelligence optimization algorithm. It has become a powerful tool for solving highly nonlinear multi-peak optimization problems. The results of performances testing using three benchmark functions show that the numbers of evaluation for fitness function of ABC are obviously less than that using particle swarm optimization algorithm. Thus, ABC has better suitability for solving multi-modal optimization problems. Finally, ABC algorithm is applied to the load distribution calculation of pile group. The result shows that the ABC is feasible and has the advantages of high efficiency and easy implementation
The Selection of Pressure Velocity Coupling Algorithm in the Numerical Wind Tunnel of Arch Roof
Authors: Wu Jian Feng , Wang Cai Hua , Yi Lu Ping
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 arch roof. It focuses on the analysis of the effects of three kinds of pressure velocity coupling algorithm on the numerical simulation results, respectively SIMPLE, SIMPLEC, PISO, to provide a basis for the reasonable selection of algorithm.
Analysis on Equivalence between Transfer Function and Equivalent Circuit Simulation in General Hamiltonian Modeling
Authors: Qian Jing , Zeng Yun , Zhang Li Xiang , Xu Tian Mao
Published: October 2012

Take generator system included AVR (automatic voltage regulator) and PSS (power system stabilizer) as an example, Using the time simulation method, Study the equivalence between the transfer function model and the equivalent circuit simulation, and establish the corresponding relations between the circuit structures, internal parameters and transfer function parameters, based on the energy of equivalent circuit, the Hamiltonian function of transfer function is derived indirectly, and the Hamiltonian model is established. The study in this paper provides a new way to establish generalized Hamiltonian model for linear system based on transfer function.
A New Method to Mine Classification Rules
Authors: Dun Yi Jie , Shao Ya Bin , Tian Shuang Liang
Published: October 2012

This paper makes use of knowledge granular to present a new method to mine rules based on granule. First, use the measure to measure the importance of attribute, and get the granularity of the universe, and then repeat this procedure to every granule of the granularity, until the decision attribute has only one value for all granules, then we will describe every granule to get the rule. The analysis of the algorithm and the experiment show that the method presented is effective and reliable.Classification rules is the main target of association rule,decision tree and rough sets.a new algorithm to mine classification rules based on the importance of attribute value supported.this algorithm views the importance as the number of tuple pair that can be discernible by it,and the rules obtained from the constructed decision tree is equivalent to those obtained from ID3,which can be proved by the idea of rule fusion.however, this method is of low computation,and is more suitable to large database . rough sets is a techniques applied to data mining problems. This paper presents a new method to extract efficiently classification rules from decision table. The new model uses rough set theory to help in decreasing the computational effort needed for building decision tree by using what is called reduct algorithm and a rules set (knowledge) is generated from the decision table. reliable classifier architecture is obtained and its effectiveness is verified by the experiments comparing with traditional rough set approaches. Data mining research has made much effort to apply various mining algorithms efficiently on large databases.
Decentralized NExT/ERA and RDT/ERA System Identification in Wireless Smart Sensor Networks
Authors: Cui Ding Yu , Xin Ke Gui , Spencer Billie F. , Liu Yu Fei
Published: October 2012

Wireless smart sensor networks (WSSN) have many advances compared with traditional structural health monitoring (SHM) such as wireless process, real-time calculation and low cost. However power consumption is considered as one of the most limitations in this field. The unique features offered by decentralized data aggregation (DDA) technique with the potential to overcome power consumption enable implementation of the dense array of WSSN on large structures. This paper presents a system identification of a simply supported plate based on the random decrement technique (RDT) and natural excitation technique (NExT) in combination with eigensystem realization algorithm (ERA) using Illinois Structural Health Monitoring Project (ISHMP) Services Toolsuite. Finally the system parameters including natural frequency and mode shapes are in accordance with numerical simulation showing efficacy and feasibility of decentralized NExT/ERA and RDT/ERA system identification.
Research on Three-Dimensional Roughness Characteristics of Tensile Granite Joint
Authors: Sun Fu Ting , Jiang Qing Ren , She Cheng Xue
Published: October 2012

The three-dimensional roughness characteristics of the tensile granite joint surfaces are studied. Firstly, the tensile granite joints are prepared by splitting cubic granite blocks, and the triangular networks of the joint surfaces are established based on the topographic data collected by laser scanner. Then, the roughness characteristics of the two-dimensional profiles in different positions and different directions are studied. It proves that the roughness of the tensile granite joint surface is position and direction depended, and the roughness parameters based on the profiles are inadequate to characterize the roughness of the three-dimensional joint surfaces. Some new roughness parameters to characterize the three-dimensional joint surfaces are finally calculated on the basis of the triangular networks, these parameters can reflect the spatial and anisotropic characteristics of the joint surfaces. The results in this paper will lay the foundation for further study of the roughness characteristics and mechanical properties of the tensile rock joints.
Cause and Stability Analysis of Daomakan Lanslide in Xiangjiaba Reservoir
Authors: Qin Yi , Wei Jin Bing , Zheng Hong Chun , Cui Yu Long
Published: October 2012

Daomakan slope, a typical ancient slope by Jingsha River, locates in Xiangjiaba Reservoir. With the rising of water level of Xiangjiaba Reservoir, Daomakan slope might pose threaten to the reservoir. Based on the detailed field investigation, the author firstly proves that Daomakan slope is an ancient landslide by the following evidences: a 1.5 meters cracked layer was found at the front of the landslide and a very deep shearing scratch appeared on the bedrock surface. Meanwhile ,the evidences above can be used to speculate that the strong earthquake is the main cause in triggering the landslide. According to the triggering and sliding process, stability analysis is conducted from an engineering geological perspective. The method adopted in this paper is suitable for field investigation, and provides a certain reference value on the ancient seismic landslides stability analysis in Xiangjiaba Reservoir area.
Summary and Application of Slope Stability Analysis Based on GIS
Authors: Liang Gui Lan , Xu Zhong Hou , Dong Xiao Hong
Published: October 2012

Slope stability analysis is of great significance in geotechnical engineering, for which there are various research approaches as limit equilibrium analysis, numerical analysis, neural network based analysis, etc. Being one of the modern approaches, slope stability analysis based on GIS rises and develops swiftly. Authors give a brief introduction of the theory, research procedures, new developments and try to make it clear the new trend in slope stability analysis. Finally, the slope stability system which was developed based on GIS is introduced. The system which can analyze slope stability based on data mining including fuzzy clustering analysis, regression analysis, extension evaluation etc has provided with more powerful slope stability functions and is easy to be integrated
Shake Table Modeling of Laterally Loaded Piles in Liquefiable Soils with a Frozen Crust
Authors: Yang Zhao Hui , Zhang Xiao Yu , Yang Run Lin
Published: October 2012

One of the most important lessons learned from Alaska’s two major earthquakes in history is that the lateral spreading of frozen crust overlying on liquefiable soils generates significant lateral forces and have induced wide bridge foundation damages. When the ground crust is frozen, its physical properties including stiffness, shear strength and permeability will change substantially. A shake table test was conducted to study the soil-pile interaction in liquefiable soils with a frozen crust. Cemented sands were used to simulate the frozen crust and have successfully captured the mechanical parameters of frozen soil. With the 2011 Japan Earthquake as the main input motion, the mechanism of frozen soil-pile interaction in liquefiable soils is clarified. A brief discussion of the recorded data is analyzed. It turned out the existence of frozen soil is essential to consider in future seismic design of bridge foundations in cold regions.
Settlement Analysis of Foundation Base on Finite Element Method
Authors: Song Xiao , Zhang Hui , Xu Guang Sheng
Published: October 2012

Composite foundation influence parameters were discussed based on Drucker-prager elastic-plastic constitutive model in this paper. Contact element was adopted to simulate the interaction between pile and surrounding soil. Finite element software-ANSYS was applied to study and analyze the distribution and deformation of foundation.
Analysis of Behavior of Composite Foundation with Sparse Pile to Control Settlement
Authors: Zhang Jun Hui , Yin Zhi Yong , Zheng Jian Long
Published: October 2012

The composite foundation with sparse piles to control settlement has been used to rapid construction and strict deformation of the structure widely currently, which can enhance the efficient of load transfer and decrease the differential settlement used with the geosynthetic. Considering the confine of analytical solution and the traditional method with a changeless modulus of geosynthetic and pile, the effects of the height of fill, the elastic modulus of geosynthetic and pile material on the differential settlement, embankment soil arching effect and tensioned membrane effect etc. are investigated using the computer code ABAQUS in this paper. The results indicate that the modulus of geosynthetic and pile has a notable influence on the differential settlement and the arching effect, which should be considered in the design. At the same time, the maximum tension in geosynthetic occurs near the edge of the pile cap.
The Test Analysis on Frost Heave Characteristics of Carbonated Saline Soil
Authors: Wang Wen Hua , Zhao Wen Ding , Wang Zhang
Published: October 2012

In order to study the frost heave characteristics of the carbonated saline soil, we have selected the carbonated saline soil sample of Da-An area in western Jilin province as the research object and analyzed the influence to the frost heave rate caused by the temperature, water content, compaction degree of soil sample, salt content, etc by indoor physical, chemical test and frost heave test. The results show that: the frost heave rate increases with the moisture content; On the bases of the certain salinity and moisture content, the frost heave rate has a increasing trend along with the increased compaction degree, but also there is the best frost heave compaction degree; Temperature changes have a great impact on the soil frost heave rate, gradually reducing the temperature, the frost heave deformation of the saline soil sample increases gradually, when the temperature down to -10 °C, the deformation are stabile; The frost heave rate increases almost with the salt content, which is for that if the salt content is larger, then the soil sample freezing point is lower, so the frozen works will last for a longer time, also the eventually larger frost heave rate.
Stability Analysis of Soil Slope and the Design of Anti-Slide Piles during Unsteady Seepage
Authors: Li Yong Quan , Jing Hang , Wang Qing Huan , Chen Jun Fu
Published: October 2012

Principle of calculation of water and earth pressures together by Limit Equilibrium Method (LEM) is introduced, and coupled deformation and seepage analysis is conducted by Finite Element Method (FEM ).The response of one soil slope is simulated during rapid drawdown of water level by LEM and FEM. The results calculated show that seepage upraises the critical slip surfaces, and critical slip surfaces and safety factors by two ways are pretty close. To assure the safety of the slope, the design of anti-slide piles is carried out. Those ways used may provide reference to engineering practice.
Monitoring and Analysis of Fine-Grained Frozen Soil Temperature and Permafrost Table for Transmission Line Foundation
Authors: Ding Shi Jun , Cheng Yong Feng , Lu Xian Long , Yang Yu Ping
Published: October 2012

To analyze refreezing state and permafrost table of the frozen ground for the Qinghai-Tibet DC Transmission Line Engineering, temperature monitoring tests of fine-grained frozen soil were carried out and the thawing depth of backfilled soil was measured in Wudaoliang region of the Tibetan Plateau. The ground temperature fluctuates over time, and the fluctuation characteristics are determined by soil properties, climate, depth and other factors. The seasonally thawed layer is in the shallow of undisturbed frozen ground and backfilled soil. The maximum thawing depth of backfilled soil was about 2.3m more than permafrost table of the undisturbed frozen ground. Soil near the foundation slab was keeping frozen state. The results show that the construction of frozen ground in cold season is helpful to refreeze and keep frozen state of the ground, and can provide a basis for stability analysis of the engineering foundation.
Experimental Research on the Liquefaction Potential of Tailings Silt in Zhuziqing Tailings Dam
Authors: Hu Jing You , Xie Jian Bin , Li Wei , Li Cheng Hui
Published: October 2012

The particle composition, physical and mechanical properties of tailings silt in Zhuziqing tailings dam were tested by means of field survey and lab test. And the liquefaction potential of tailings silt in Zhuziqing tailings dam were investigated based on field-performance data using standard penetration test (SPT) and wave velocity test (WVT) methods. Results show that the liquefaction potential of tailings silt in Zhuziqing tailings dam can be evaluated by means of SPT and WVT. Results also show that there is almost non liquefaction at the places in Zhuziqing tailings dam where are under the seventh sub-dam, and there is serious liquefaction in the new sub-dam and deposited beach, which locate at the places above the eleventh sub-dam.
Numerical Simulation Analysis on Effects of Freezing and Thawing on Workover Rig Anchor Pile Bearing Performance
Authors: Zhu Juan , Zou Long Qing , Fu Hai Long
Published: October 2012

Through simulating interaction between pile and foundation soil after establishing surface-surface contact element with finite element method and ANSYS software, the load resistance performance and ultimate strength of the ground anchor pile working for a workover derrick are achieved. In winter, frozen soil depth can be up to 2 meters in north china. When temperature rises in spring, the Polar grassland changes by three stages, namely, frozen, freeze thawing and melted. But for the large temperature difference between morning and evening, the state of the soil layer is extremely unstable which greatly affect the carrying capacity of anchor piles. This paper focuses on the melting influence of soil layer and the load resistance performance is studied. With a set of calculation parameter, the simulation result shows that the carrying capacity of anchor piles decreases 28% in melted state than freeze thawing.
Study on Soil Pressure of High Fill Retaining Wall in Construction Stage
Authors: Li Peng , Song Xiao
Published: October 2012

The traditional formula using for the calculation of Expressway on high embankment of the retaining wall and the earth pressure can not be very good practical. In order to accurately determine the soil pressure calculation of the complex retaining wall in construction stage for guaranteeing the engineering safety, the experiment study on soil pressure is done, and the study on soil pressure monitoring data is also done. Then the valuable conclusions are obtained to facilitate better practical guidance for construction.
Comparison and Analysis of Identification of Soil Stratigraphy in Shanghai between CPTU Test and Laboratory Test
Authors: Wang Jun Peng , Wu Yong Nan , Liu Yao
Published: October 2012

This article presents a comparison and analysis between piezocone penetration test (CPTU) and laboratory test in identifying soil stratigraphy of Shanghai. In China, stratigraphy for soft deposit is mainly obtained from plasticity index and grain size distribution of borehole samples in the laboratory (refer to code method). Identification of soil stratigraphy with CPTU was developed and improved in recent decades. The analysis is carried out with the field data at test site of Yan’an Road Tunnel in Shanghai. The stratigraphy charts proposed by Robertson in 1990 (refer to Robertson charts (1990)) are used to identify soil strata. The results are comparison with that from the code method. The results show that Robertson charts (1990) can be suitable to identify the stratigraphy of soft deposit of Shanghai. Moreover, the discussion on discrepancies between them is also conducted.
Pseudo-Static Approach to Single Rammer Energy Calculation in Dynamic Compaction of Saturated Soft Soil Foundations
Authors: Liang Ji Feng , Wang Feng , Bao Guo
Published: October 2012

The article puts forward a single-rammer energy calculation formula based on pseudo-static method which is to be applied in the dynamic compaction trials of saturated soft soil foundations. A comparison between the formula and the dynamic compaction effective reinforcement range formula is made. Then, data from actual engineering project are applied to the formula, and the calculated results are consistent with the testing results. That is to say, the formula can facilitate the forecast of single-rammer energy in dynamic foundation compaction.
Experimental Study of Time-Frequency Effect of Rocks
Authors: Wan Xin Lin , Zhang Su
Published: October 2012

Sine wave loading experiments are carried out on MTS for pump-oil saturated Nanjing sandstones and water saturated Dali marbles. The Young’s modulus and velocities of longitudinal wave and transverse wave increase with the frequency, and there are notable dispersions. The existence of micro defects in saturated rocks result in hysteresis at the sinusoidal loading experiments. The variation curves of instantaneous Young’s modulus with stress for loading and unloading intersect, and an “X” shape figure is obtained. As the frequency of the sinusoidal wave increases, the position of the intersection point moves to higher modulus area. Thus the modulus dispersion increases. Some physical mechanisms of nonlinear frequency response of rock are revealed. The results obtained are very important for nonlinear wave study, and the theoretical study and application of earthquake and engineering.
The Analysis of Impact Coefficient on Reinforced-Concrete Bridge
Authors: Qi Chun Xiang , Xia Fei , Zhang Run Feng
Published: October 2012

In order to discuss the displacement impact coefficient of the simply supported beam bridge, reinforced-concrete simply supported beam models with different span and different section stiffness are set up using the finite element method in the paper. The maximum dynamic displacement of beam models under the running vehicle is calculated. Combined with the maximum static displacement, the corresponding impact coefficients of models are calculated. At the same time, the modal analysis of beams is conducted to calculate the impact coefficient based on the base frequency. From comparing with the displacement impact coefficient, the bridge spans and section stiffness influence on impact coefficient is analyzed. Results show that the influence of section stiffness on impact coefficient can be ignored, but the influence of the change of span cannot be ignored. It will provide a reference for designing and detection technology of reinforced-concrete simply supported beam.
Research on Skeleton Curve of CFST Frame Structure
Authors: Sun Xiu Li
Published: October 2012

Concrete filled steel tubular (CFST) structure is a new type of structure. According to unified theory, hysteretic model of steel beam, reinforced concrete beam and CFST column have been chosen respectively, then nonlinear structural analysis program called IDARC is employed to determine skeleton curve of the CFST frame structure. Results obtained from program are consistent well with those obtained from experiments. Furthermore, some parameters that affect the restoring force model of CFST structure have been studied, including axial compression ratio, steel ratio, material strength and so on. The results not only provide necessary theory basis for popularizing the CFST structure but play a valuable role to seismic design of CFST structure. The contribution described herein outlines a possibility for simulating the seismic behavior of CFST using the nonlinear program called IDARC. The present work offers a simplified approach for establishing the skeleton curves of CFST frames.
Discuss on Precast Concrete Tube Column
Authors: Ding Hong Yan , He Chao , Zhang Pu Yang
Published: October 2012

This paper presents a new type of precast concrete tube column which was first put forward by Tianjin University of China. Precast concrete tube column is composited by outer precast concrete tube which is large-scale precast in component factory and inner cast-in-situ concrete. Analysis itself characteristics, comparing with steel tube column and traditional precast component, precast concrete tube column has a good research value. Then new patterns of precast concrete tube column beam-column joint are discussed. Finally the axial compression performance and bias-axial compression performance of precast concrete tube column are simulated by finite element software ABAQUS. The result shows that precast concrete tube column has high bearing capacity. The team of Tianjin University is constantly perfect the research of precast concrete tube column. Soon there would be updated content to be reported.
Slope Strengthening by Using a Grid Beam System
Authors: Yang Fan , Chen Bo , Song Chun Fang , Li Peng Yun
Published: October 2012

The evaluation of slope strengthening by using a grid beam system is carried out in this study by using a real slope existed in China is taken as the example to investigate the effects of the strengthening approach. The geological conditions of the example slope are introduced at first. The three dimensional element model of the slope is constructed with the aiding of the commercial package FLAC3D. The excavation process is simulated to obtain the stress distribution and displacement status. The slope performances without and with strengthening are numerical investigated and compared. The different bending moments of vertical beam of the frame and foundation pressure of slope reinforced with binding bolts, pre-pressed anchors and stress dispersion cables are computed. The made observations indicate that the stability of the slope has been obviously improved by applying the strengthening. The approach utilized in this study can also be adopted in the slope strengthening on the other sites.
Design Analysis of Unbonded Prestressed Concrete Two-Way Slab
Authors: Liu Jia Sheng
Published: October 2012

Through some engineering example, the finite element software SAP2000N is used to make a finite element analysis on the prestressed concrete slab, which is made of concrete with grade of C40, low relaxation PC strand wile with tensile strength standard value of 1860N/mm2and nonprestressed reinforcements with grade of HRB335. By doing this, the author systematically introduced the material selection, prestressing technique and linear, load values and internal force calculation, distribution of prestressed tendons and nonprestressed reinforcement, the design process of crack and deformation of cast-in-site prestressed concrete two-way slab.
Base-Isolated Multi-Storey Reinforced Concrete Frame Structure Modal Analysis
Authors: Wang Cai Hua , Li Hui Jian , Wu Jian Feng
Published: October 2012

The multi-storey reinforced concrete frame structure used lead rubber pad as the base isolation device. The paper had modal analysis of base-isolated multi-storey reinforced concrete frame structure using the ANSYS software. Comparing the frequency and vibration mode before and after isolation under El-Centro wave, It concluded the leader rubber pad have seismic isolation effect for multi-storey reinforced concrete frame structure .
Experimental Analysis on Shear Behavior of Sand-Concrete Interface
Authors: Zhao Chun Feng , Yu Bao Lai , Zhao Cheng
Published: October 2012

In order to study the shear behavior of sand-concrete structure interface, shear stress and relative displacement curves were obtained through a series of direct shear tests, in the procedure of which the roughness of interfaces was quantified into 3 grades and the stress history can be achieved by loading the sand to an initial normal stress and then unloading to a normal stress to shear. Through analyzing the curves, several conclusions can be obtained as follows: Shear stress increases with the initial normal stress and roughness at the same tangential displacement. The initial shear modulus can be improved in case of the increase of initial normal stress and roughness. The friction coefficient can be obtained by fitting the curve of the maximum shear stress and normal stress corresponded to Mohr-Coulomb Criterion linearly. The friction coefficient of sand-concrete interface increases with roughness as well as its increase range.
The Key Points in the Design of Supporting Structures for Dual-Track Tracking CSP System
Authors: Zhang Yong , Xu Fang Bin , Song Bo
Published: October 2012

The dual-track tracking CSP system is an amelioration of the traditional photo-thermal power system. One advantage of this system is that the heliostat, with its movable support and slip frame, can be powered to instantly keep track with the sun, thus promoting the efficacy of the generator. The supporting structure of the heliostats has an enormous bulk, and being removable, it encompasses many links to pass the complicated force. Furthermore, the cooperation of various parts of the system, such as the structure, control system, opticator, and mechanical parts, must be taken into consideration in the design process. Therefore technical feasibility becomes the premise for the realization of the system, and its production cost determines the scale of its practical application. Based on the working principle of the dual-track tracking CSP system, this paper makes an analysis of the features of the supporting system of the heliostat, clarifies some key points in the design and optimization of the supporting structure, and puts forward some advice on the solution of the problems.
Discussion on Stability Analysis Method for Tailings Dam
Authors: Lv Shu Ran
Published: October 2012

The tailings dam stability is an important part in the evaluation of the tailings dam, at present setting-value evaluation is the main method through all, calculation models has failed to consider variability and inhomogeneity of many factors that can influence the stable state of tailings dam, which make the calculation results that can not comprehensively reflect the actual status and stability of tailings dam. The analytical method of reliability based on probability theory, mathematical statistics and operational research, not longer use a specific safety coefficient to measure the stability of the slope, instead define the instability of the slope as a probability result. With the increasingly wide range of applications and the rapid development of analytical method of reliability in engineering practice, and this method will eventually become a tailings dam stability evaluation method.
Behaviour of Laced Curved Concrete-Filled Steel Tubular Members Subjected to Axial Compression
Authors: Zheng Lian Qiong , Zheng Yi Feng , Guo Shu Li
Published: October 2012

Laced curved concrete-filled steel tubular (CCFST) member is an attractive proposition to be widely used in large-span space structures for economic and aesthetic purposes. A finite element model (FEM) was developed to perform an analysis on the full-range load versus deformation curves of laced CCFST members under axial compression to make it possible for proposing the further practical design.
Simulation Method of Soil Resistance on the Pushover Model of Group Pile Foundations
Authors: Zhang Yong Liang , Li Tian Bao
Published: October 2012

Soil is a strong non-linear media and show obvious nonlinear under the small displacement of the foundation. Under the strong earthquake, the seismic performance of group pile foundation is closely related to the nonlinear force-displacement relationship of soil around the pile foundation and the elasto-plasticity o fpile. This paper introduces the nonlinear static pushover analysis of group pile foundation , summarizes the commonly used simulation method of soil around the pile foundation and compares the advantages and disadvantages of various simulation method.
Analysis on Hot summer and Cold Winter Areas of the Thermal Bridge Hybrid Structure
Authors: Zhang Xin Hua , Liu Jian Xin , Zhang Hong Zhuan
Published: October 2012

Due to the multilayer mixed structure is a planted in hot summer and cold winter zone of the widespread use of the traditional construction form, its exterior wall palisade structure heat of existing in the large thermal bridge is main wall of heat consumption important parts. According to the features of the climate, analysis exterior insulation system thermal bridge characteristics, from the wall materials heat transfer coefficient calculation and analysis of the prevention and control of the thermal bridge proposed measures.
Research on Method of Non-Linear Static Pushover Analysis and Influential Mechanism of Displacement Ductility of Single Pile
Authors: Chen Xing Chong , Yue Xue Lin , Zhang Yong Liang
Published: October 2012

In this article, the distribution of plastic hinge model is adopted to simulate the elastic and plastic of pile body, p-y curve is used to simulate resistance of pile foundation soil. We do static non-linear pushover analysis of the single pile of pile foundations, and research the influence of the axial compressive ratio η of pile shaft, longitudinal reinforcement rate ρ of section, stirrup ratio µof section and shear strength C of foundation soil to the system-interaction of pile and soil. The result shows that axial compressive ratio of pile shaft has a significant influence on horizontal limit bearing capacity and the displacement ductility of the system. With the increase of the axial compressive ratio, system of the displacement ductility reduces gradually, but the limit bearing capacity increases gradually. Under a horizontal load, the order and the mechanism of plastic hinge are obviously different because of different axial compressive ratio of pile shaft，This analysis method may further provide a reference for nonlinear seismic analysis of pile bents.
Discussion on the Future Building of Urban Rail Traffic Network of Hohhot
Authors: Wu Jun , Li Cheng Bing , Ge Jing Fang
Published: October 2012

Based on the detailed analysis of the characteristics of urban rail traffic planning，and with analyzing city current situation of Hohhot，the necessity and sufficiency of the future network of urban rail transit in Hohhot are firstly analyzed .Then，according to the economic and social development goals of Hohhot，city scale and the present traffic situation as well as the city traffic construction planning and urban population forward distribution, the future sort of the project construction here is discussed. Finally,from the perspective of view of the economical society, some suggestions are put forward on integrated planning of urban rail transit network—— railway in order to enrich the theories and the methodology of the urban mass transit network planning.
Design of Cortex-M3-Based Semiautomatic Block Fiber System
Authors: Zeng Xiao Qing , Zhu Jing , Qiu Lei , Shen Tuo , Shi Dong Bing
Published: October 2012

In rebuilding and extension of railway, many inter-station block cables are replaced with fibers, but the previous 64 semiautomatic blocks cannot be connected. In this research ARM's 32-bit MCU with Cortex-M3 core is used to build a failsafe software-hardware integrated platform, replacing block cables with fiber channel to achieve transmission of block instruction and enhancing reliability by reducing communication links in the system. The system provides complete functions and powerful self-adaption in its compact size to meet the actual needs for engineering.
Analysis on Integrity of Urban Eco-Network in the Dongting Lake Region Based on ANP
Authors: Xiong Jian Xin , Chen Duan Lu , Peng Bao Fa
Published: October 2012

The urban eco-network is the network structure in the urban eco-system that the flowing of substance, population and information have been formed in the spatial distribution. Using Analytic Network Process, MapInfo and GIS, taking Chang de city of Dong-ting Lake Region as an example, the paper analyses the integrity of urban eco-network. The results show that: (1) The characters of connection in the eco-system of forest, farmland and town are very poor between spots, the indexes of alpha, beta and gamma are very low, and the index of alpha appears negative; By comparison, the character of connection of the wetland is a little better, but its index is also low; With regards to the region, its character of connection is much better. (2) The characters of entrance in the eco-function districts is much better, transformational network is relative convenient, especially in the eco-agriculture district. (3) As to the characters of smooth in the eco-system of forest, wetland and farmland, 5 eco-function districts are the best, and 3 eco-function districts are the worst in the 17 eco-function districts.
Strategies for Ecological Development of Cities and Towns in Xi’an Metropolitan Area - Based on the Construction of Eco-Corridors of Weihe River System
Authors: Zhang Ding Qing , Li Jun Jie , Cao Xiang Ming
Published: October 2012

Weihe river system, which is the structural frame of physical geography in Xi’an metropolitan area, has close relation to the development and construction of cities and towns. The contemporary city construction aggravated the degeneration of the river system’s natural environment, which has greatly constrained the sustainable development of local area. The thesis presents the conception of constructing Weihe river system eco-corridors, and discusses the corridors’ construction methods in macro-scale, middle-scale and micro-scale respectively. Furthermore, it puts forward the basic strategies for promoting ecological development of cities and towns as follow: optimizing regional landscape pattern to form the overall pattern of coordination between urban and rural; guiding the development of cities combined with ecological planning of river system, and improving the layout of cities relying on the river eco-corridors, so as to promote the ecological harmony between cities and rivers.