bluuebunny/crossref_metadata_2025 huggingface dataset:
Manufacture and Performance Test of New Type MR Damper
Authors: Sun Song Jian
Published: December 2012

A new type of small proportion double rod structure magnetorheological(MR) damper was manufactured in this article, and the damper performance test was taken on electro-hydraulic servo system. The results indicate that the damper is not only able to provide a large damping force, but also its adjustable coefficient is high. And the hysteresis curve is still good in a high-frequency vibration, so it has a good stability.
An Improved Magnitude Estimation Method Using Combination of Predominant Period and Peak Amplitude for Earthquake Early Warning
Authors: Song Jin Dong , Li Shan You
Published: December 2012

The critical technology of Earthquake Early Warning (EEW) is determining the size of an earthquake and the predicted ground motion at given site, from the first few seconds of the P wave arrivals. Currently, there were two different approaches to the EEW magnitude estimation, the predominant period method and the peak amplitude method. However, both methods mentioned above had some disadvantages, such as significant uncertainty and saturation at great magnitude. To improve the results of magnitude estimation, a combined method using predominant period τc and peak amplitude of acceleration Pmax was introduced. Compared with the predominant period method and the peak amplitude method, the estimation standard deviation level of the combined method is 0.42 using NSMP strong motion data. The magnitude estimation results of the first three seconds P wave indicate that, the estimation precision of combined method is higher than those of the two methods, the predominant period method and the peak amplitude method, and the saturation at great magnitude is improved.
Study on Fire Resistant Performance of Recycled Concrete Tubular Structures
Authors: Dong Hong Ying , Cao Wan Lin , Zhang Jian Wei
Published: December 2012

In order to achieve the fire resistance performance of recycled concrete, four concrete tubular structure specimens were designed and tested under the high temperature. One of the specimens was made from normal concrete C20, one was made from recycled coarse aggregate concrete C20, and two were made from recycled coarse and fine aggregate concrete C20 and C40 respectively. The temperature field, the vertical displacement, the wall deflection and the fire endurance were comparatively analyzed. Results show that the rate of temperature increasing inside the concrete becomes smaller with the increase of recycled aggregate replacement rate. The temperature of specimens with recycled concrete is lower than that with normal concrete at the same position, the same force condition and the same fire condition. The load carrying capacity of specimens with recycled concrete is lower than that of the normal concrete specimen due to the bigger porosity of recycled concrete. The fire endurance decreases with the increase of recycled aggregate replacement rate in the specimens. With the increase of the strength of recycled concrete, fire resistance and fire endurance of the tubular structure decrease and the structure tends to fail in expansion under high temperature.
Control Effect on Diesel Pool Fire by Longitudinal Smoke Discharge and High Pressure Water Mist
Authors: Zhang Pei Hong , Feng Rui , Xu Wen Bin , Tian Xiang Liang , Shang Rong Xue
Published: December 2012

The subway tunnel benchmodel(1/3)of small scaled size is established to study fire spread control effect under the combined effect of the longitudinal smoke discharge and water mist. The different working pressure of water mist is opened at the same time with the smoke discharge. The suppression effect of the diesel pool fire is observed and it can be concluded as follows: When the longitudinal smoke is started, it can effectively control the spread of smoke, but the lasted combustion time of fire increased, the sole longitudinal smoke discharge is not the optimum measurement on the control of diesel pool fire. For the diesel pool fire with the surface size of 250mm×200mm, the experiments show that the combination of water mist and longitudinal smoke discharge, which were started simultaneously, are able to control the fire effectively. And the 15MPa water mist is the best on the fire control affection with the combination of smoke discharge.
Application of Recursion Algorithm Method in Design of a Chinese Transmission Tower’s Chord Member
Authors: Cui Lei , Jin Xiao Hua , Wu Di
Published: December 2012

Optimization method was designed via selecting a series of self calling functions on the basis of application of recursive algorithm method. An optimization method for unifying section of transmission tower’s chord member was testified from the example. The procedure to the feasible combination patterns for unifying section was put forward by recursion. Based on the hypothesis of static determination, the sections of the members in each pattern were shown, and the optimal design can be obtained by comparing existing patterns. Three different constraint inputs of transmission tower were checked by the recursion algorithm method in this paper. The comparison result shows that the design of unifying section save 123 Kg of steel after optimization under the condition of 5 division pattern of chord member. The number of possible combination of unifying section pattern was increased sharply, while the optimal weight of tower is decreased with the division of chord member.
Close Framework CAD System Development on Airport Project
Authors: Teng Qi Jie
Published: December 2012

Close framework structure becomes recently a competitive solution for taxiway bridges. Due to no pile foundation construction, it has short duration and significant economic benefits. The development of close framework CAD system adopts Visual Basic and bases on secondary development interface in AutoCAD VBA to draw construction plans, such as structure diagram, bridge layout, prestressed tendons and ordinary reinforced chart. Another feature is the automatic generation of materials amount Excel tables and model for finite element analysis. The main program code of graphic object realization and deign parameters import are described. For the unique professional characteristic in airport project, the software system has a considerable engineering prospect.
Simulation Research on Cross-Sectional Stability of Expanded Diameter Conductors Based on ANSYS
Authors: Si Jia Jun , Wan Jian Cheng , Liu Bin , Ding Yao
Published: December 2012

The expanded diameter conductors are widely used for high voltage electricity power transmission due to its superior ability to prevent electronic corona phenomenon. However an undesired stability problem of wire distribution configuration within the cross-section of the conductor often occurs during the power line stringing processes, especially for the not-well-designed conductor structures. This phenomenon is typically characterized by the appearance of outer wire/wires jumping out of the layer; therefore it is also referred as wire jump-out problem. Finite element model which can predict the wire jump-out phenomenon has been successfully developed in this research project. Series of stimulations have been carried out to investigate the key factors to cause the wire jump-out problem. The reduction of radial distances between the adjacent aluminum wire layers due to the obvious indentation deformation at the trellis contact points were identified to be one of the most significant factors to lead to the wire jump-out problem. Numerical results show that keeping sufficient initial gap between the adjacent outer layer wires in the initial design can be a simple effective way to relieve/avoid the wire jump-out problem.
Boundary Extension Technique for HHT Based on Response Surface Method
Authors: Bai Ling , Liu Jin Zhao , Xu Ai Min , Fang Xing
Published: December 2012

HHT is widely used to analyze nonlinear and non-stationary signals. But how to extend boundaries of signals in decomposition processes is a key problem of HHT. A new technique based on response surface method (RSM), which establishes the recursive relations between sample points of signals, is presented to deal with this difficult problem. Besides, the boundary extension problem arising from HHT can be described by mathematical least squares problem but traditional gradient algorithms may diverge when the Hessian matrix of the object function of the least squares problem is non-positive. It has been proved that the generalized inverse of the linear equations (derived from the linear least squares problem) by singular value decomposition is the solution of original linear least squares problems. Thereby the divergence problem is also solved. Analysis results with respect to simulation signals and measured signals show that the method with new boundary extension technique performs successfully for HHT.
The Analysis and Research of IPTV Set-Top Box System
Authors: Bai Fang Yan , Sun Qi
Published: December 2012

IPTV has great value for media provider and consumer interaction, and it also can be configured in a number of functions to complete the user selection. This paper is mainly to introduce the key technology and protocol standards of IPTV related theory and IPTV set-top box. On the basis of this study high-definition IPTV system based on ST-7109 is designed. On the ST-7109 platform, the embedded terminal broadcast of the streaming media is realized by using embedded Linux software. The text also researches ST7109 module internal resources, as well as designs good source decoder hardware circuit on the base of peripheral interface circuit of the function; it also finishes the design and analysis surround set-top box software, function module, real-time operating system Linux.
Research on the Technology about Dealing with the Landslide of Expansive Soil Cut Slope
Authors: Tan Bo
Published: December 2012

Flexible supporting is a kind of treatment more reasonable than rigid supporting for dealing with the landslide of expansive soil cut slope. Base on flexible supporting treatment mechanism, a corresponding finite element calculation method is established. Take into consideration reasonably the expansion force, use nodal force to simulate interaction between the geotechnical grille and expansive soil. Calculation results agree with the actual situation, and have provided a theory basis for flexible supporting reasonable size of design.
Design and Implementation of the Embedded-Based Advertising Player
Authors: Du Qin Sheng , Qin Hong Wu , Li Guo Lin , Li Xiong Fei
Published: December 2012

In this paper the network advertising player is introduced. It can update the contents conveniently. The Kind-Arm 6410 development board is used as the display of the player. In one PC, the HTTPD server is set and the control interface is set in another. Firstly, the user logs into the background web interface, chooses the files and sends to the server through the socket network. Then the file is sent to the development board by the server. On the board it is decoded by the mplayer and displayed on the screen.
An Artificial Immune Based Incremental Data Clustering Algorithm
Authors: Xiao Xin
Published: December 2012

An improved resource limited artificial immune algorithm is proposed, which is applied to the incremental data clustering. The algorithm adopts an improved function of stimulation level, allowing the system to distributing resources more reasonably. And the algorithm introduces the immune response model, simulating the initial response and the secondary response. Through simulation experiments on the UCI data sets, and comparison with the artificial immune based influential incremental clustering algorithms, it shows that the algorithm is effective, can extract data characteristics, and increases the clustering accuracy and data compression rate.
An Efficient and Practical Centralized Routing Algorithm for IEEE 802.16 Mesh Network
Authors: Liu Jia , Li Xu
Published: December 2012

The IEEE 802.16 mesh network, which is self-organized and self-configured with multi-hop, is deployed to providing an effective solution for broadband wireless access system. The standard defines the basic scheduling scheme, but doesn’t specify the resource allocation and routing scheme in the protocol. Therefore, designing a reasonable scheduling and routing algorithm to enhance the capability is very important for the system. In this paper, we propose an efficient and practical routing algorithm which takes the channel condition and modulation mode into consideration in an IEEE 802.16 mesh network. Furthermore, our algorithm enables direct communications between subscriber stations without referring to the base station. Simulation results show that our algorithm effectively improved the scheduling length, delay and system throughput.
Pantograph-Catenary Model Simulation Based on DSPACE
Authors: Lin Shuai , Ju Zhi Qiang
Published: December 2012

With the city subway and high speed rail opened, development of rail transit pays more and more people's attention. And the pantograph is the primary means of train running at high speed to get power. Using Simulink and dSPACE in combination, real-time captures the pantograph and catenary's motion. According to the state of the pantograph’s motion, analyses physical model, so as to achieve the purpose of independent manufacturing pantograph pantograph.
Road Damage Feature Extraction in Image Based on Fractal Dimension
Authors: Shen Zhao Qing , Chen Xin Dong , Tang Xuan , Zhang Hong Lei
Published: December 2012

This paper studies the basic principle of the fractal theory, and analyses fractal characteristics of the road crack external form. The fractal dimension characteristic construction algorithm is designed by self-similarity of fractal dimensional and its mathematical expression form. Then road crack texture fractal extraction and analysis is highlighted based on one dimensional fractal. At last, it is compared with regional division combined methods segmentation by testing. The results show that the fractal dimension is a kind of effective quantitative method to depict road crack characteristics, and the algorithm can extract various road crack feature effectively and improve the fracture identification precision and intelligence.
Specifications of Projects of Virtual Prototypes
Authors: Šedivý Josef , Dvořák Karel , Drtina Rene
Published: December 2012

Efficient use of tools for design, simulation and data management is linked to the quality of preparation of project. Post presents the issue of preparation of the project of a virtual prototype and subsequent key stages throughout the project. The starting point are the latest trends in contemporary industrial practice and research investigations of efficiency of deployment of tools for design, simulation and data management in industrial practice
Selection and Evaluation of Maritime Universities’ Discipline Construction Model
Authors: Sun Hong Li , Ding Yun Long
Published: December 2012

Discipline construction is the foundation of school operation and the key link of a university’s development. Generally speaking, discipline construction of maritime universities can be concluded to four models: vocational education model, mutual development of practice and scientific research model, derivative discipline development model and large-scale integrated development model. Through the comprehensive assessment of the four models by the use of lattice order decision-making method with interval numbers, the advantages and disadvantages of each model are clearly shown. Taking the economic and social factors into consideration, we can see that mutual development of practice and scientific research model is the most suitable model for maritime universities’ discipline construction in China, which provides important reference value and contributes to the development of our discipline construction.
Research on Non-Standard Assignment Problem Based on the Vogel Method
Authors: Zhang Li Feng , Zhao Xue Da
Published: December 2012

In daily life, it often comes to such a problem that a department need to complete assignments , and there are people who are committed to achieving the tasks. In view of each person has different abilities and tasks, so the efficiency is different either .In order to gain the maximum efficiency or the minimum tine-consuming of accomplishing tasks ,there arise a question that is how to effectively assign these resources. The paper uses the Vogel method of transportation problem to solve the non-standard assignment problem. In practice, it’s more convenient and effectively to solve the assignment problem with the Vogel method than the Hungarian method.
Researching the GERTS Schedule Simulation Model Based on Resource Constraints
Authors: Lei Jun Hua
Published: December 2012

To solve the problem of resources constraints to the process in the schedule plan, this paper presents a GERTS schedule simulation model with resource constraints. Through the change of the GERTS model nodes, which introduces and re-defines a resource function, it solves the GERTS’s defects in describing an action that depends too much on the resource. The model is applicable to the simulation and analysis of the schedule plan. Finally, the paper gives the example of the specific simulation algorithm.
Exploration and Practice on Graduation Design (Thesis) of Mine Geotechnical Engineering
Authors: Ren Lian Wei , Guo Jia Qi
Published: December 2012

For four years of university study, graduation thesis (design) is a very important teaching in university, but there are different levels of undergraduate thesis (design) quality at present, which will affect the quality of personnel training in university. Firstly this paper points out the problems in graduation thesis (design) of the mining geotechnical engineering, then the methods and measures of improving the thesis (design) quality is proposed, finally exploring and practicing on teaching optimization of the thesis (design) is discussed.
Using Taguchi Quality Analysis Method to Evaluate the Food and Beverage Service Improvement Trend
Authors: Liao Cheng Wen , Yen Tieh Min
Published: December 2012

Traditional analysis methods cannot analyze the data of customer satisfaction and dissatisfaction and be applied to decision-making, thus are unable to identify the quality improvement priority sequence. This study treated the food and beverage (F&B) service providers in Taoyuan International Airport as the research subject, and applied the Taguchi quality analysis method to evaluate the F&B service and identify the improvement direction for the F&B service quality.
Energy-Saving Oriented Matrix Management Mode and its Key Techniques for Engineering
Authors: Chang Chun Guang , Jia Zhao Nan , Liu Ya Chen , Kong Fan Wen
Published: December 2012

For enhancing energy-saving for construction engineering project, energy-saving oriented matrix management mode (ESOMMM) is proposed. The frame of the ESOMMM in engineering project is established from two dimensions (basic stage and key content). Under the precondition that the key contents are implemented, the key energy-saving techniques are respectively studied from planning, building, rebuilding and usage stage. And the coordination optimization model for key techniques under ESOMMM is established to solve conflict among varied key techniques. The energy-saving achievement after application is analyzed by applying ESOMMM, its key techniques, and the coordination optimization model in Shenyang city. The result shows that above mode, key techniques and model in engineering project will be benefit for enhancing the energy-saving greatly.
Discuss about Stockholding Reformation of Project Management Enterprises
Authors: Tian Bao Wen
Published: December 2012

The construction project management enterprises always encounter a number of problems in the process of rapid development and expansion, and many of the problems are caused by the internal mechanism of enterprises. In order to solve these problems, this paper compared two forms of the different operation effect between limited liability companies and joint stock limited companies. Through continuing exploration of theory and practice, the author believes that, by stockholding reformation on the basis of the corporate system, many of the above problems can be solved with harmony internal relations and activated enterprise impetus, and after that, those enterprises can provide better project management services for the construction market in China.
Study on Project Risk Management System Based on Group Decision Support System
Authors: Li Hong Min , Deng Yan Bing
Published: December 2012

Project risks are generally perceived as events that influence adversely the achievement of project objectives, nowadays, risk management has become one of the key project management processes, and there are many complex evaluation and decision-making problems in risk management process. In order to improve the efficiency of decision maker group for risk management study, this paper applies Group Decision Support System (GDSS, a kind of group decision technique) into risk management of projects at the planning stage, and introduces a prototype GDSS entitled Interactive Risk Management System (IRMS) to help manager to make good decisions. Besides, this paper illustrates the main functions and working principles of each part of the proposed system, the working process of this system and the implementation method of each part are also discussed.
Three-Dimensional Analysis of the Partner of Laterally Loaded Variable Rigidity Pile (Pile Partner)
Authors: Xue Jiang Wei , Yang Yong , Zhao Yi , Ge Xin Sheng
Published: December 2012

Concerning the stress and displacement of the partner under lateral load, reference on full-scale model tests on behavior of cast-in-place concrete pipe piles, two cases are analyzed by means of 3D finite element method, calculations show that in condition I, pile and cap rigid joint (pile foundation) plus partner, partner block the punching stress from pile top to cap continue to spread; and in condition II, the distance between pile top and pile cap is 200 mm, partner is in normal bending shear state; As the flexural rigidity of partner is much larger than the pile, if under earthquake or other rare action, partner may sacrifice firstly to keep pile perform well.
Analysis of Influence Factors of Slope Stability
Authors: Wen Shu Lian , La Hai Bin , Wang Chang Zhong
Published: December 2012

Slope stability is affected by many factors, their effects on the slope stability may be big or small. Along with continuous improvement of the various calculation methods, it is more important to identify the main influencing ratio factors in the process of analyzing the slope stability than to select the method of calculation .Therefore the paper analyzed the main internal factors, calculated to get five curves that showed the relationship between these influence factors and the safety factor, The results show that unit weight of soil, cohesion and internal friction angle are the main factors affecting slope stability. Then, it can take corresponding measures in the process of targeting and optimal designing slopes in order to achieve security, economic and efficient goals.
Influencing Factors Analysis of Stability of Hole Wall of Bored Pile in Seasonal Frozen Ground in the West of China
Authors: Duan Zhi Dong , Duan Ya Ping , Yan Pei Wu
Published: December 2012

Collapsing and shrinkage of hole wall are two troubles to drilling of bored pile. In order to avoid such troubles, ultimate hole depth of bored pile was deduced with dry excavation technology. To hydraulic excavation technology, by the method of finite element numerical simulation and finite element strength reduction, excavation process of hole of bored pile are simulated in ADINA and ANSYS software, The influences of hole radius, hole depth, power of rotary drilling rig and pressure of auger boring tool on stability of hole wall are analyzed. The analysis indicate that the major problem of stability of hole wall of bored pile in seasonal frozen ground in the west of China is hole shrinkage. the deeper and bigger the hole are or the greater the pressure of auger boring tool is, the more serious the phenomenon of hole shrinkage is. Under other same conditions, to reduce pressure of auger boring tool less than to 35KPa, hole shrinkage can be reduced effectively.
Feasibility Analysis of Safety Mining Underlying Limestone Water in Yuandian Coal Mine
Authors: Fang You Ling , Chen Yu Long
Published: December 2012

The No.10 coal seam in the first mining area of Yuandian Coal Mine lies in Taiyuan Group limestone aquifer with rich water, the underlying limestone water is an important danger for mine water-filling. To ensure the safety of mining, it is necessary to study and analyze the mining conditions. On this basis, with the design of targeted prevention and treatment of water, we achieve the purpose of safe mining.
Analysis of the Effect of Ground Water Level Change on Site Predominant Period
Authors: Zhao Guang Wei , Wang He
Published: December 2012

The rigidity and density changes of foundation soil were studied in this paper ,as well as the change rules of earthquake wave spread effect and site dynamic characters,through comprehensive wave velocity test and the computer simulation,in which the ground water level change was taken into consideration . According to the engineering examples, the effect of the fluctuation of underground water level on the site predominant period is analyzed.
Calculation and Application of Mining Stress on the Coal Floor
Authors: Gao Zhao Ning
Published: December 2012

According to the distribution law of the abutment pressure before and behind the working face, the calculation model of the coal floor stress was established and the distribution law of the floor stress along with the advance of face was analyzed. The results show that, in working face ahead, the vertical stress and horizontal stress have generally increased, and the vertical stress is more than horizontal stress, and floor rock strata is in compression bending state with mining influence. Then in the rear of working face, the vertical stress and horizontal stress have generally reduced to less than the original rock stress, and horizontal stress is more than vertical stress. Thus rock bottom is in reverse curving condition, and upward migration of the strata causes the floor drum. Such results can provide theoretical basis for water inrush with pressure mining and treatment of the floor drum of the working face.
Performance Assessment on the Plastic Mortar Culvert Reinforced by Glass Fiber
Authors: Yang Fan , Sun Yu Zhou , Chen Bo
Published: December 2012

The structural performance of the PMCRGF subjected to the static loading is actively investigated in this study. The structural properties and of the PMCRGF is briefly introduced at first and the construction process of the PMCRGF is discussed. The field measurement on the structural performance of the PMCRGF is carried out. The arrangement and process of the field measurement is illustrated in detail. The structural deformation and stress distribution are also computed based on finite element approach. The structural fine finite element model is constructed with the aiding of the commercial package ANSYS. The stresses at different section are computed and compared with those obtained from the field testing. The made conclusions from field testing and theoretical analysis can provide beneficial instruction for the real application the plastic mortar culvert reinforced by glass fiber (PMCRGF)
Application of Long-Short-Pile Composite Foundation of High-Rise Building in Soft Soil
Authors: Song Rong Fang , Lang Ling Yun , Wang Jing
Published: December 2012

A case of the long-short-pile composite foundation in liquefied soft soil under a 30-storey high-rise building is presented, in which the long and short piles are made of cement-flyash-gravel (CFG) and lime. A new design calculation method of bearing capacity and settlement of composite foundation is introduced, and the calculated value is compared with the actual measurement. The results show that the liquefaction of soft ground is eliminated and the demand of load and settlement for upper building is met. At the same time, it is proved that the design method is feasible.
Comparison and Research on the Cantilevered Steel Structure Roof of Weinan Hongji Building, Shanxi Province
Authors: Luan Huan Qiang , Ma Ke Jian , Chen Zhi Hua
Published: December 2012

The substructure of Weinan Hongji building in Shanxi Province is frame shear wall structure, supporting a cantilevered steel roof in the shape of an “official hat”. Two different design proposals were compared between pipe truss structure and steel frame. Space truss system was adopted in the middle large span part. Spatial analysis of the overall model was carried out using Midas730 software and 51types of load combinations were considered. The period, mode, strength and stiffness are compared and the result shows that the option 1 outperforms option 2.
Comparison and Study on Calculation Methods of Cold-Formed Thin-Walled Lipped Channel Members’ Capacity about Distortional Buckling
Authors: Tang Ting Ting , Yao Jian
Published: December 2012

Distortional buckling which is one of the most important buckling modes for cold-formed lipped channel sections as well as local buckling and global buckling may change mechanical properties and decrease the ultimate load of members. This paper reviews research achievements in distortional buckling, compares the existed design methods according to five national (regional) codes and the latest research achievements. Based on the comparison between five calculating data and test results, it is shown that the design method of North American specification has widespread application and relatively high accuracy, which could supply references for structural design.
Large Pendulum Bolt Failure Analysis and Countermeasures
Authors: Lin Wei Ming , Zhang Yong , Xiang Hui Yu , Huang Jia Jun
Published: December 2012

This paper analyzed the causes of the bolt failure problem of pendulum for different working conditions using the finite element method. The simulation shows that the bolt fracture is due to relaxation caused by bolt slewing bearing and a flange partial slip on .The cause of the failure was the structure design lacking of effective anti-loosing measures. Finally, this paper put forward an effective design scheme to prevent bolts from damage during working process and proposed the specific measures and bolt failure countermeasures.
Analysis on Affecting Factors of Controlling Surface Subsidence of Filling Mining
Authors: Liu Yin , Gao Lin Hai , Fan Hai Yan , Yu Fei , Dong Meng Meng
Published: December 2012

It is mining subsidence that causes the damage of ecological environment and the surface buildings. The basic method to relieve the damage is to controll surface subsidence effetely. For this problem, the thesis studied the characteristics of overlying rock failure through theoretical analysis, on the basis of the mechanism of surface subsidence. Then we obtained three main factors to subsidence which are sunken, compression, and lithological characters. According to the main factors influencing mining subsidence under cut and fill mining, then we reduce the impact from these factors successfully by taking appropriate measures to control it.
Analysis of Limit Load of Damaged Ring-Stiffened Cylindrical Shell
Authors: Lü Yan Song , Xiao Ken
Published: December 2012

In order to find out the limit depth that locally damaged submarine can dive, the model of ring-stiffened cylindrical shell with local indentation was proposed. The limit load of model were calculated and compared with ideal ring-stiffened cylindrical shell. In order to assess the residual limit load of the ring-stiffened cylindrical shell, a residual limit load coefficient is proposed and a series of curves of the coefficient are drawn.
FEM Analysis of Concrete Filled Square Steel Tubular Columns with Energy Dissipation Plate
Authors: Hui Cun , Cao Wan Lin
Published: December 2012

In order to improve the seismic energy dissipation performance of concrete filled square steel tubular (CFST) columns, the structural measure about puting the additional energy dissipation plat at the bottom of the CFST columns where bears more stress, was proposed. Finite element anylsis of 10 CFST columns with different structural measure were performed under the same axial compression, selecting the thickness and height of the energy dissipation plate as parameters. On the basis of finite element anylasis, this paper, which obtained load-displacement curves of each finite element model, analyzed and compared the bearing capacity of each model. The results show that: comparing to the ordinary CFST columns, the columns with energy dissipation plat show better about bearing capacity and seismic performance, the height of the energy dissipation has a significant effect on bearing capacity but the thickness has less impact.
Restoring Force Model of Joints of RC Frame Retrofitted by FRP
Authors: Li Peng , Peng Ya Ping , Yao Er Lei
Published: December 2012

In order to evaluate the seismic performance of reinforced concrete (RC) frames retrofitted by FRP, the experiment of RC frames retrofitted at joints by FRP was carried out. The enhancement in seismic performance of the retrofitted frames is evaluated in hysteretic performance, bearing capacity, stiffness degradation and energy dissipation. And the strengthening effect of the frame retrofitted by CFRP and C/GFRP was compared in the experiment. The restoring force model of RC frame joints retrofitted with FRP was proposed and ranges of the characteristic parameters were determined. The equation of restoring force model for joints strengthened by C/GFRP was suggested. The result show that seismic performance of RC frame retrofitted by FRP based on joints can be improved remarkably. The restoring force model which proposed can be used in seismic elasto-plastic analysis of RC frame structure retrofitted by FRP and practical engineering seismic retrofitting design by FRP.
Experimental Investigation on Behavior of Slender Steel Reinforced Concrete Columns Subjected to Eccentric Load
Authors: Han Zhuo , Jiang Shao Fei , Sun Zhi Ping , Zhou Le
Published: December 2012

The objectives of this research were to investigate the structural behavior of slender steel reinforced concrete (Referred to as SRC)composite columns subjected to eccentric axial loading. The test consisted of 10 slender columns, with rectangular section160×180mm, and steel shape I10 encased in concrete. The stirrup spacing was 150 mm; its diameter was 6 mm. The diameter of longitudinal reinforcing bars was 10 mm. Details of the experimental investigations including description of the test columns, failure modes and mechanisms, strain characteristics, and load-deformation responses are discussed. Effects of concrete strength, slenderness of columns, and eccentricity of axial loads on the load-carrying capacity of slender column are then presented. Based on these results, a range of slenderness ratio and eccentric ratio of slender SRC column is proposed.
Experimental Research on the Temperature Field of High and Hollow-Thin Pier
Authors: Sun Jian Cheng , Zhang Zhong Le , Xiao Qing Yi
Published: December 2012

To study the temperature field changing regulation of hydration heat and control concrete cracks caused by great temperature difference in the construction of hollow-thin pier, testing the temperature field of the high and hollow-thin pier of Cha Jiugou Bridge and it got changing regulation of the temperature. The finite element analysis on the pier was also carried out and the temperature stress contours and curves of the hydration heat of the concrete are obtained. It can be seen that the outer surface and the center of the pier are compressive within 10 hours in the pouring early. With the temperature difference, the center generates the compressive stress, the surface generates tensile stress.
Study on Seismic Performance of Connection of Hybrid Coupled Wall System
Authors: Song An Liang , Su Ming Zhou , Li Xu Dong , Shi Yun , Wang Zhen Shan
Published: December 2012

Based on the state-of-the-art of the research on connection of steel coupling beam to shear wall, The steel coupling beam has satisfactory seismic performance which is better than reinforced concrete coupling beams and composite coupling beams. In this paper, the existing research results were summarized and some views were put forward. It was useful to develop a seismic design method for hybrid coupled walls in China.
Mechanical Behavior of Steel-Encased Concrete Filled Prefabricated FRP Tubes Short Column under Axial Compression Based on ABAQUS
Authors: Zhang Hai Xia , Cao Peng Peng , Yao Jing , Fang Chen
Published: December 2012

The paper presents numerical analysis on steel-encased concrete filled prefabricated FRP (fiber reinforced polymer) tubes short column through the finite element analysis software ABAQUS and verifies simulation results compared with experimental results in order to investigate the mechanical behavior of the composite column under axial compression. Based on the correct simulation results, the full-range study combined with the concrete, steel and FRP tubes of stress distribution, the mechanical performance of the column are studied in this paper. The research shows that the stress-displacement of composite column calculated in the paper can be divided into three stages, namely, elastic stage, elastic-plastic stage and failure stage.
Joint’s Connected Forms of Prefabricated Concrete Frame Structure
Authors: Han Jian Qiang , Zhang Jian Ya
Published: December 2012

With the advance of China's urbanization, the quantity and quality requirements for residential buildings are getting higher and higher, the housing industry is an important way to promote China's urbanization. The prefabricated concrete structures of the technical development and promotion is an important means to achieve housing industry .And to research a reasonable form of beam-column connection is the top priority of the prefabricated concrete structures research and promotion. This paper summarizes the recent year’s domestic prefabricated concrete frame structure beam-column connection form and seismic performance.
The Influence Study of League Shear Wall Seismic Capacity by the Coupling Wall-Beam Rigidity and Reinforcement Ratio
Authors: Yang Zong Ren , Liu Fei Jiao
Published: December 2012

According to the important role of the league shear wall seismic capacity in the practical engineering, a brief and effective finite element static push-over analysis model was established through using the MIDAS GEN7.95. With the changes in the coupling beam rigidity and reinforcement ratio, the structural base shear, structural failure displacement change during the simulation. On the basis, the curve of the coupling wall-beam rigidity, reinforcement ratio vs. base shear and failure displacement were built respectively. The results show that the coupling wall beam stiffness, reinforcement ratio and league shear wall seismic capacity have a significant effect relationship, which provides an important reference for shear wall seismic design of structures.
Bistable Phenomenon of the Aerodynamic Forces on a Square Prism with the Aspect Ratio of 5
Authors: Wang Han Feng
Published: December 2012

The flow around a finite-length square prism with aspect ratio of 5 is numerical investigated using LES at Red = 3900. The prism is mounted on a flat wall, with one end free. Based on the simulation results, it is found that the near wake is highly three dimensional under the effects of free-end downwash flow. The shear layers from prism side walls and free end form an arch-type structure. There are two typical flow modes presence in the near wake: first, the spanwise vortices are staggered arranged similar to that in 2D cylinder wake; second, the spanwise vortices are quasi-symmetrically arranged. These two modes occur alternately and intermittently. When the first mode occurs, the pressure on the prism side surface fluctuates periodically, corresponding to large values of drag and fluctuating lift coefficients; when the second modes occurs, there is no obvious pressure fluctuation on prism side surfaces, and the correspond drag and fluctuation life coefficients are significantly smaller than those for the first mode.
The Application of Stability on Prestressed Concrete Cable-Beam Structure System
Authors: Xie Xin Ying , Yin Xin Sheng
Published: December 2012

The paper introduces the importance of stability and current reseach status on prestressed concrete cable-beam structure system.It demonstrates the basic relative theory on stability in concretely research and applies this theory into the prestressed concrete cable-beam structure system,the formula of stability on this system is come true to make the analyze prestressed concrete cable-beam structure system precisely.
Flexural Behavior of Fiber Reinforced Concrete Beams Confined with FRP
Authors: Rajkumar Kasinathan , Vasumathi A.M.
Published: December 2012

In this paper, an attempt to overcome the problem of brittleness of concrete, by adding polypropylene fibers to the concrete is made. The performance of the polypropylene fiber reinforced concrete will be investigated experimentall under two point middle third of monotonic load for various types of polypropylene fibers and FRP Wrapping.
An Experimental Study on the Seismic Behavior of Recycled Concrete Short Columns with Different Stirrup Ratio
Authors: Cao Wan Lin , Dong Hong Ying , Zhang Jian Wei
Published: December 2012

A comparative study is conducted on the seismic behaviors of five 1/2 scale recycled concrete short columns with 1.75 shear span ratios. The stirrup ratio in the specimens was changed from 0.4%, 0.9%, to 1.29% while the ratio of their longitudinal reinforcement was the same. Crossed reinforcing bars were set in two of the specimens. Cyclic loading test was carried out for the specimens under axial compression ratio 0.4. The stiffness and its degradation, load-carrying capacity, ductility, hysteretic behavior, energy dissipation and failure phenomena of each short column were analyzed. Results show that, with the increase of the stirrup ratio in the specimens, the shear failure of the specimens is getting lighter and lighter. And the load-carrying capacity, ductility, energy dissipation capacity are improved greatly, but the rate of the increase is tending to slow. Moreover, crossed reinforcing bars in the short columns are able to improve the seismic behavior. Recycled concrete can be used for structural columns with low axial compression ratio in earthquake area.
A General Form of Constitutive Relations in Non-Smooth Elastoplasticity
Authors: de Angelis Fabio
Published: December 2012

A general formulation of constitutive relations in non-smooth elastoplasticity is presented. The treatment applies to general non-smooth plasticity problems and to problems characterized by non-smooth yield criteria or dealing with non-differentiable functions. The mathematical tools and instruments of convex analysis and subdifferential calculus are suitably applied since they provide the proper mathematical instruments for dealing with non-smooth problems and non-differentiable functions. General formulations of constitutive relations and evolutive laws in non-smooth elastoplasticity are illustrated within the presented theoretical framework. Connections between the proposed mathematical treatment and the classical relations in elastoplasticity are illustrated and discussed in detail. The presented generalized treatment is equipped with considerable advantages since it shows to be ideally suited for the development of variational formulations of structural problems in non-smooth elastoplasticity.
Research on Leachate Treatment Process Selection of Guangxi Municipal Solid Waste Plant
Authors: Cheng Hao , La Ming , Xiong Jian Hua
Published: December 2012

Based on the research of municipal solid waste leachate treatment technology in China, aiming at several typical leachate treatment technologies in the Guangxi area, this paper has made analyses and studies. It has made comprehensive investigation of materials, and has obtained the final leachate treatment technology scheme applicable in the Guangxi area.
The Effect of Ferric Ion and Copper Ion on Extracellular Polymeric Substances
Authors: Ge Li Yun , Deng Huan Huan , Gao De Xiang , Wang Hong Wu
Published: December 2012

Extracellular polymeric substances (EPS), which are vital cellular polymeric substances, play an important role in biological wastewater treatment. In this paper, four SBRs (blank, added 20mg/L Fe3+, added 40mg/L Cu2+, added both 20mg/L Fe3+ and 40mg/L Cu2+, respectively) were used to investigate the effect of Fe3+ and Cu2+ on EPS produced by microorganism from activated sludge. Carbohydrate and protein were main components of EPS. The total content of EPS, the content of protein and carbohydrate, and the content of DNA in EPS were detected. The results show metal ion had an effect on the formation of EPS and the total content of the EPS. The effect of ferric ion on protein was more obvious than copper ion. Furthermore, the addition of metal ion had little effect on DNA in EPS.
The Effect of Doping Ce and Fe on the Mn/TiO2 Catalyst for Low Temperature NO Selective Catalytic Reduction with NH3
Authors: Feng Shi Ye , Gao Pan , Dong Chang Qing , Lu Qiang
Published: December 2012

A series of manganese-cerium oxide support titanium oxide with different Fe/Ti, Ce/Ti ratio were investigated for selectivity catalytic reduction of NO low at temperature with NH3 as a reducing agent. The catalysts base Mn/TiO2were prepared by sol-gel. The effect of amount of Ce and Fe oxide on the NO conversion of Mn/TiO22was studied. X-ray diffraction (XRD), temperature program desorption (TPD) were carried out. It was known that cerium oxides and iron oxide promoted preformance of Mn/TiO2 for low temperature. because Lewis is mainly take important role in the reaction for low temperature.
Research of Biochemical Processing on Wastewater of Halogen Products
Authors: Wang Qing Yu , Guo Xiao Yun , Xie Shu Kun
Published: December 2012

The wastewater of halogen products were treated with UASB-SBR method, and the influence of the UASB reactor operation days on the CODCr removal were experiment, decolorization removal and turbidity removal, aeration time, as well as water load. The results showed that: the halogen products wastewater was treated by UASB process; the CODCr removal of wastewater can reach 86.2 %. Then the wastewater were treated with SBR process, and the CODCr of wastewater fell below 100 mg/L, which can meet the second grade discharge standard of “Integrated Wastewater Discharge Standard”（GB8978-1996）.
Physicochemical Modeling of Hypergene Mineralization Processes in the Solnechnaya Reclamation Plant Tailing Dump (Khabarovsky Region) in the Temperature Range from -5 to +45 °C
Authors: Kostina Alyona Mikhailovna , Zvereva Valentina Pavlovna , Frolov Konstantin , Pyatakov Anton , Lysenko Anastasia Igorevna
Published: December 2012

The article presents the results of physicochemical modeling of hypergene processes in the tailing dump of the Solnechnaya Reclamation Plant (SRP). The effect of temperature factor on the hypergene minerals crystallization and pore solutions formation was researched.