bluuebunny/crossref_metadata_2025 huggingface dataset:
Monitoring and FDM Simulation Analysis of an Expressway with Unsymmetrical Loadings
Authors: Zhao Chuang , Wu Ke , Li Shu Cai
Published: June 2012

FDM simulation and the monitoring data for the right exit of GuanYinPing tunnel on the Gu-Zhu expressway are presented. The FDM model is established to simulate the deformation behaviors and deformation tendency of the tunnel. According to the unsymmetrical loading geological conditions, the excavation and lining program can be corrected timely. Comparative analysis of the simulation results and monitoring data can optimize the supporting system, which also can take technical support for the rational construction. It is proposed that the combination of monitoring and FDM analysis be important for successful construction of the tunnel.
Study on Model for Settlement Prediction of High-Filled Embankment in Mountainous Area
Authors: Li Peng , Wan Hai Tao
Published: June 2012

Mountain high-filled embankment settlement prediction methods need to do some research. With the analysis of the experimental observation’s results, obtained some factors that influence the settlement. Then through the comparison of these three kinds of calculation models with the measured data, obtained the results which are suitable for the construction of the medium range estimate are as follows: Hyperbolic curve method and Exponential curve method. As gray prediction theory method is suitable for the long-term prediction after construction. The comparisons the accuracy of these different methods can provide reference for the prediction of embankment for similar constructions.
Study on the Effects of Tamping Frequency to the Compaction Degree of Trackbeds
Authors: Wang Xue Jun , Geng Xing Li
Published: June 2012

Tamping homework is the important means of railway ballasted track maintenance meanwhile it is a complicated and changeable process. The compaction degree is an important parameter for discrimination which is a basis to estimate the effect of tamping homework. The author adopted Bond Ball and Bounding Sphere methods based on the spherical particles in EDEM software. Modeling and simulation research for real railway ballasted particles are conducted in this article. The author puts forward that the change of ballasted track shear strength is the main basis of discrimination criterion for the compactness of the track. Based on discrete element theory, the main work is to establish a rigid-flexible coupling dynamic model of tamping tines and sleeper and ballasted track, and according to this model, the dynamic response of the granular particles under tamping load is calculated. Based on this model, tamping frequency change from 15 to 60 HZ scope with the steps of 5 HZ, the track of the compaction degree of different change can be researched. The research shows the discrete element method is an effective method for solving the numerical simulation of railway ballast of trackbed tamping. The compactness of trackbed is best when tamping frequency changes near 35 HZ.
Operation Conditions Analysis on Solar Energy Compression-Injection Secondary Refrigeration System
Authors: Zhang Fei Fei , Tian Qi , Yin Li Yuan
Published: June 2012

The COP of compression-injection secondary refrigeration system is increased by 20%-50% than traditional compression-injection system. This paper analyzes the operation conditions on generation temperature, intermediate cooling temperature, condensation temperature and evaporation temperature in the compression-injection secondary refrigerating system powered by solar energy. Comprehensively considering technical and economic factors, the results show that generation temperature should be increased and condensation temperature should be decreased. In addition, the area of solar heat collector and the COP of the system should be considered when we chose the intermediate cooling temperature.
Load Transfer Mechanism of Embankment Supported by Sparse Piles
Authors: Zhang Hao , Shi Ming Lei , Zhang Rui Kun , Zhao Yu
Published: June 2012

The load transfer property of embankment fills, cushion, pile (or with cap) and foundation soils are complicated in a piled embankment. In this paper, the vertical load effects of pile and foundation soils at the bottom of embankment were analyzed with consideration of the interaction of each component. The arching effect of embankment fills and the pile-soil interaction were respectively formulated, and then, with continuous displacements and stresses at the bottom of embankment, a calculation method of pile-soil stress ratio was presented. In addition, the influence of the setting of cushion and geosynthetic was analyzed. The present method could definite the load sharing between pile and soil, and may be applied in the engineering design of embankment supported by spares piles.
The Influence Analysis of the Soil Base and the Base Stiffness of Highway Asphalt Pavement on Pavement Thickness
Authors: Song Jian , Cui Wen Yan , Fan Yun Yun
Published: June 2012

Using pavement thickness layered system computational theories and methods that current design criteria proposed, according to the result of the calculating example, this paper analyzed the influence of different soil base and the base stiffness of highway asphalt pavement for base thickness, and pointed out that thickness of pavement base decreased with increase of the soil base and the base stiffness. Therefore, optimum selecting fillers in constructing road bed beside the upper part of the roadbed, strengthening the subgrade and compacting by layer, to improve the mechanical properties of subgrade. Meanwhile, it has important significance in obtaining the obvious economic effect on decreasing thickness of pavement structure by properly using base material of high stiffness. Besides, this result indicate that the base course underside stresses increased with the base stiffness, therefore, the base course underside stresses should be checked, to ensure the corresponding the tensile strength of base material.
Analysis of Fretting Wear of Type II Fastener Elastic Bar
Authors: Wu Zeng , Ning Xiao Jun , Zhao Ping Rui
Published: June 2012

The main function of fastener was achieved by elastic bar. The traditional method for the study of fatigue stress, strain analysis, which was not reflected the true situation, because the elastic bar in the work with other members of the contact surface between the mutual movement of tiny was created, i.e. fretting. The shear stress（ ）, relative displacement（ ） and two of the product（ ） of elastic bar was calculated out by applying Coulomb friction model of nonlinear contact theory of simulation of elastic bar and the surrounding contact element. Theoretical analysis was shown that, if the fretting wear in fatigue fracture was played a major role, it should be located in a section of the and of the value of the biggest point of attachment. Fastener fatigue tests was shown that, a fracture was found at the tail of elastic bar and baffle contact, which was between the value and value of the maximum point and closer to the value for maximum point. Crack was created because of fretting wear of tail of elastic bar and baffle, then the pollution source was formatted, and crack was propagated under the repeated effect, and the fracture of elastic bar was created eventually. The theoretical analysis of elastic bar of fretting wear was shown correctly by the fatigue test, and the improved design of elastic bar for a improving fatigue life was provided scientifly.
The Influence of Street Geometry on Building’s Energy Consumption in Different Climate Zones
Authors: Wang Nan , Elnimeiri Mahjoub
Published: June 2012

This research explores the influence of different street geometry towards reducing the energy consumption in buildings by utilizing building energy simulation software. In different climate condition, the different street geometry has different influence on building’s energy consumption. This influence is quantified in this research. It is found that in three climate zones – Beijing, Shanghai and Guangzhou, the energy consumption of buildings is changed according to different H/W ratio of buildings. This finding determines that the optimum street geometry will be different in these climate zones. The designers should consider such difference before doing architecture or urban planning work. This research will also provide some suggestions and recommendations to the energy-efficient community design based on the findings.
Study on Horizontal Displacement of Alluvial Flat Soft Ground under Embankment
Authors: Wang Xiao Mou , Yuan Huai Yu , Wang Lin
Published: June 2012

There are three soft ground types in the joint highway of Jiaozuo-Gongyi Yellow River bridge in Henan province: shallow, sandwich and deep layers. By analyzing the observation date, the horizontal displacement characteristics of alluvial flat soft ground under embankment are studied. The settlement is the dominant deformation in construction time, but the mainly factor that controls construction speed is horizontal displacement of the weakest layer. The failure mode of sandwich and shallow type grounds is different to the circular one in deep type ground, so the translation mode is put forward. Due to the uniform in thickness and spaces of alluvial flat soft ground, the horizontal displacements are quite different at both sides of subgrade.
Research on Water Damage of Asphalt Pavement and Control Measures
Authors: Liu Yan , Liu Bo
Published: June 2012

Asphalt pavement of water damage is a major form of our country highway asphalt pavement damage, the paper analyzes pavement structure internal water source, water damage of asphalt pavement of the influence factors, through the determination of the three indexes and asphalt of asphalt mixture splitting tensile strength, water erosion proof of asphalt mixture and its influence, and put forward the corresponding prevention and control measures to improve the pavement performance and extend the service life of road surface has important practical value.
Research on Harmonic Control of Electric Railway
Authors: Xu Xiang Zheng , Dong Ya Jun
Published: June 2012

It is necessary to suppress harmonics because of electric railway traction power supply system has serious harmonic problems. This paper has established averaging model, and the robustness of active power filter is analyzed based on the H-infinity control theory. Simulation results show that electrified railway harmonic control effect is good based on H-infinity control. And it has the fairly good stability and robustness.
Experimental Study on Thermal Conductivity of Road Concrete
Authors: Zhang Yan Cong , Gao Ling Ling , Shen Jun Min
Published: June 2012

In order to analyses affection to thermal conductivity from various factors, such as: coarse aggregate, mortar ratio, sand ratio, water cement ratio, fly ash and air content, thermal conductivity of a series of concrete specimens were determined based on thermal conductivity meter. The results showed that: coarse aggregate, mortar ratio and gas content is the main factor affecting concrete thermal conductivity. Meanwhile, water-cement ratio, sand ratio and fly ash had few effects on the thermal conductivity. In addition, a certain formula to predict thermal conductivity of concrete was proposed.
Displacement Field Study on the Full Width of Rigid Airport Pavement to Aircraft Loadings
Authors: Zhang Xian Min , Dong Qian
Published: June 2012

Considering the joint loading-transfer effect, a 3-D finite element model which consists of thirty full-scale slabs is established. Making the aircraft loads act on different positions and calculating their vertical displacements. The results indicate that the loading area is compressive and the regions far away from loading area are tensile and that the vertical displacement curves change dramatically when aircraft wheels act on different locations.
Analysis on the Traffic-Response of Asphalt Concrete Overlay on PCC-Slab
Authors: Xu Wei , Wang Xuan Cang , Li Shan Qiang
Published: June 2012

Focusing on the severity of asphalt concrete pavement crack, the optimization analyzing finite element model(FEM) of typical asphalt overlay pavement was developed to address reflective cracking, in which the analysis of traffic-loading response were concentrated on the stress-intensive areas close to the joints or cracks. The FE sensitive analysis, evaluating the influence of pavement construction parameters, including modulus and thickness of pavement courses, is useful to establish comprehensive model of overlay pavement construction.
Evaluation Index LPD of Highway Lighting’s Energy-Saving
Authors: Li Wei , Zhu Chuan Zheng , Yang Yong
Published: June 2012

LPD’s (lighting power density) definition, calculation method, standard value, influence factors and ways to reduce it are talked in this article. The aim is to take measures to reduce LPD properly. LPD should be less than standard value while guaranteeing traffic safety, average and uniformity road surface luminance. Then a road lighting system of energy-saving should be built as soon as possible.
Influence of Design Parameters of Highway on the Deformation
Authors: Zhang Yan Mei , Zhang Xu Dong
Published: June 2012

Based on the geometry irregularity of pavement, an expression of the traffic load was put forward. The influence law of design parameters of each part of highway and pavement geometry irregularity on vertical deformation of highway was discussed by the three-dimension finite element numerical analysis. The research shows that the vertical deformation range of highway under the action of traffic load is generally semi-circular; the influence of surface stiffness on vertical deformation is different in different horizontal positions of surface; the influence of subgrade stiffness and foundation stiffness on vertical deformation is remarkable, but that of course stiffness is small; the rational matching of all parts of highway can effectively reduce the vertical deformation; with the increase of geometric irregularity index, the vertical deformation increases significantly.
Study on Influence of Unloading of Vacuum on Stability of Embankment Improved by Vacuum Combined with Preloading
Authors: Liu Ji Fu , An Guan Feng , Zheng Gang
Published: June 2012

In order to study influence of unloading of vacuum on stability of embankment whose soft ground is improved by vacuum combined with preloading, the change of effective stress of soft clay in the improved area is analyzed when vacuum is unloaded and the undrained shear strength of soft clay in the improved area after unloading of vacuum is deduced. Changes of undrained shear strength of soil and stability of embankment owing to unloading of surcharge are also analyzed for comparison. It is shown by theoretical analysis, laboratory tests and a project that the undrained shear strength of soft clay improved by vacuum combined preloading is decreased after unloading of vacuum and the stability of embankment after unloading of vacuum should be taken into account for design. Safety factor of stability of embankment increases after unloading of surcharge since decrease ratio of load of embankment is more than decrease ratio of undrained shear strength of clay.
Research on Impedance Function of Highway Under Snow
Authors: Zang Xiao Dong , Zhang Xing , Qi Zhao Hui
Published: June 2012

According to the theoretic analysis, a new free velocity model was derived and presented under snow. This model took into account the friction and centrifugal force and the force of inertia on a traveling vehicle, and building an equality based on the moment balance, then analyzing the extent of parameters in this equality, after that calculating the extent of the free flow velocity, then the free flow time model was built. According to the field data, testing the speed model, the testing results show the speed model is feasible. Then calibrating the VISSIM simulation model, and calculating the value of BPR parameters based on the simulation results, at last, an improved BPR impedance model of highway under snow is built.
Application of the Internet of Things Technology in Explosive Dangerous Goods Transport
Authors: Liu Chang , Li Ya Dan , Ji Shou Wen
Published: June 2012

This paper introduces the basic properties of the explosive dangerous goods and the matters needing attention during the transport process. It also designs the monitoring system for transport process based on the technology of the Internet of things, including the route choice subsystem, the set out audit subsystem and the en-route item state supervision subsystem. Finally it analyzes the function and the operation process of the transportation monitoring system and the application of RFID in the system.
The Urban Villages Building Envelope Energy-Saving Research in Northwestern Henan
Authors: Zhang Xian Mei , Yan Shuai Ping
Published: June 2012

This paper will analysis the energy-saving situation for the urban village building envelope structure such as the wall, windows, roofs and others according the economic conditions and climate characteristics of northwestern Henan province, put forward the suitable designing ideas and measures about the energy-saving for the exterior-protected structure, provide a basic research for the urban village energy-saving designing.
Study on Hybrid Genetic Algorithm for Capacitated Vehicle Routing Problem
Authors: Ren Chun Yu
Published: June 2012

Capacitated vehicle routing problem is logistics optimization indispensable part. The hybrid genetic algorithm is used to optimize the solution. Firstly, use sequence of real numbers coding so as to simplify the problem; Construct the initial solution to improve the feasibility; adopt some arithmetic crossover operator to enhance whole search ability of the chromosome. Secondly, use Boltzmann simulated annealing mechanism to improve the convergence speed and search efficiency. Finally, comparing to other algorithms, the results demonstrate the effectiveness and good quality.
Urban Rail Transit Operation during World Expo 2010 Shanghai
Authors: Zhu Wei
Published: June 2012

This paper presents the operation practices of Urban Rail Transit during the Word Expo 2010 period in Shanghai. The overall traffic strategy of the Expo and the role of urban rail transit system are first introduced. The focal points of this paper are operation schemes during the Expo, such as train arrangement, passenger flow organization, emergency response, and the coordination with other transport modes. The paper concludes that the Expo travel demand can be met well without sacrificing local urban daily traffic. To have a good linkage with other transport modes as well as the Expo, urban rail transit should play its role in the framework of overall traffic strategy. And in today’s international events, guidance measures including various media are more and more important in the transportation demand management. Practices in Shanghai also show that management of transit stations and information sharing among different public transport systems should be improved.
The Study on Transportation Planning for Historic Cities Based on Low Carbon Concept
Authors: Cao Hong Yan , Song Zhi Hua
Published: June 2012

With the rapid development of urbanization and motorization, contradiction between transportation development and historical features protection becomes prominent. Transportation planning is crucial for the future development of a city; therefore, active strategies must be adopted on account of the characteristics of historic cities. This paper argues that for historic cities, the principle of transportation planning should be low carbon, low pollution and low energy. Taking Penglai city as an example, the author analyzes its traffic features first, and then with the guidance of low carbon principle, the author probes into issues such as public transportation, road network, parking facilities and transportation supervision of the transportation planning.
Study on Coordinated Planning of Integration of Urban Rail Transit and Conventional Public Transportation
Authors: Kong Qing Feng , Sun Xiao Nian
Published: June 2012

As for the current background that China sets off a new round of urban rail transit development, the paper in-depth analyzes the differences in running characteristics and technical features between urban rail transmission and conventional public transportation, and explores functional coordinated complementary relationship and necessity of integrated planning of urban rail transmission and conventional public transportation. Then, the principles, main contents and safeguard mechanism of coordinated planning of integration of urban rail transit and conventional public transportation can be concluded and summarized in order to provide theoretical support for realizing the efficiency and convenience of urban public transportation system.
Mechanism Analysis of the Impact on Chinese Urban Rail Transit Construction on the Surrounding Real Estate Prices
Authors: Lv Jian Liang , Jiang Ying
Published: June 2012

This paper first studies the real estate prices and and its effecting factors, and point out the construction of urban rail transit effects large on its surrounding real estate prices. Then, the paper clarifies the theoretical basis of its effects, and finally analyzes mechanism that construction of rail transit can make its surrounding real estate value-added. The urban rail transit construction can improve surrounding property accessibility, the residents travel convenient, increasing the intense of land development, changing nature of land use, adjusting industrial layout, accelerating expanded urbanized areas, raising employment opportunities, promoting socio-economic prosperity and development. It provides reference for the reasonable allocation of late-stage value-added benefits, and people can get a comprehensive and systematic understanding of the impact of urban rail transit construction and its surrounding real estate prices.
Modeling Traffic Conflicts between Pedestrians and Vehicles at Signalized Intersection Based on the Cellular Automata
Authors: Li Xiao Meng , Yan Xue Dong , Wang Jiang Feng
Published: June 2012

The traffic conflict between pedestrian and vehicle is a main factor that influences the intersection safety and capacity. In this paper, a conflict model that simulates the pedestrians and vehicles’ crossing behaviors when passing the pedestrian crossing area at signalized intersection is presented based on cellular automata method. Evolution rules for pedestrians, vehicles and conflicts between them are assigned. Four types of traffic conflict events and conflict areas are categorized and defined. On the basis of the simulation results, the pedestrian delay owning to traffic conflicts, the number of pedestrians’ conflicts, the conflict event and their relationships with the vehicle density as well as the pedestrian density are analyzed and discussed. This model reproduces realistic pedestrian-related traffic phenomenon effectively and can be used in more complex traffic environments at signalized intersections.
Research on Speed Limit of Two-Lane Highway of Mountain Area
Authors: Kan Yu Heng , Qiu Xin , Shen Xiang , Yang Qing , Zhang Le Yi
Published: June 2012

The paper investigates the effects of the road geometry parameters and the driver psychosocial reaction behaviors on driving safety of vehicles on the two-lane highway of mountain area. Firstly, the equivalent accident rate, P, is put forward as driving safety indicator, and the parameter sensitive analysis are performed between P and road geometry parameters including curve radius, slope and length, then the estimation model and evaluation criterion of P is established. Secondly, the psychosocial reaction behavior index, N, is provided as ride comfort indicator, and the evaluation model of N is established by relating N with road geometry parameters and driving speed. Finally, the two kinds of limiting condition including highest safety of the general bending, slope sections and lowest safety of the sharp curve, steep sections are present and the corresponding the driving speed is calculated. The analysis show that when V=35km/h in the most secure particular curved, the optimum driving safety and comfort can be achieved. As well, the maximum speed will be 10km/h in the lowest ones.
Taboo Search Algorithm for Optimizing Shunting Scheme of Through Wagon Flow Delivering and Fetching Operation
Authors: Xie Jin Bao , Han Ying , Han Long , Yang Rui Na
Published: June 2012

In order to improve the efficiency of selecting the optimal scheme from the delivering and fetching shunting schemes of through wagon flow to and from the enterprise dedicated lines which are located in radial shape, the taboo search algorithm is applied in the process finding the optimal solution. The objective function is directly used as the fitness function, and the solution generated by exchanging the wagon group delivering order of one dedicated line with another is taken as the new solution; the taboo list is two-dimensional array, and a fixed value is given as the taboo length; if the evaluation value of the current optimal solution is superior to the historical one, the taboo rules will be defied and the current optimal solution be directly accepted; once the iteration number reaches the predetermined number, the calculating process will be terminated. The simulation results verify the effectiveness of the Taboo search algorithm to the problem, and show that the bigger the number of the dedicated lines, the more the number of equivalent schemes and the higher the searching efficiency is. And the smaller the number of the equivalent schemes, the bigger the search scope is. If the number of the dedicated lines is not more than 8, the processing time by computer is not longer than 15 milliseconds.
Study on the Model of Intercity Passengers' Trip Mode Choice Based on Cluster Analysis Method
Authors: Peng Hui , Xu Man Man
Published: June 2012

In order to make the forecasting results of intercity rail transit's passenger volume conform to the actual situation, as well as that the model of intercity passengers' trip mode choice can better reflect the actual situation, this paper will take the following two aspects into account: one is that different socio-economic characterized intercity passengers will choose different ways to travel; the other is that intercity passengers' whole travel is classified into urban trip and transport corridor trip. Therefore, when determine characteristic variables of the utility function, in addition to the travel time and cost, comfort and safety will also be included, and be quantified following the scoring method. After all the above analysis, the logit model based on cluster analysis method will be established, and the reliability and effect of the model will be verified through an example.
A Modal for Operation Coordination among Regional Rail Transit, Urban Metro and Bus
Authors: Liu Peng
Published: June 2012

In order to achieve joint operation among regional rail transit, urban rail transit and major bus lines, a joint operation coordination model was set up to optimize the joint operation, based on the analysis to the operation rules and cost of three mode of transit and passenger's travel cost. Thereafter, the standard genetic algorithm was used to test the application of this model with an example. And test results show that: the total cost and operating cost of joint operation system and passengers' waiting cost and transfer cost in the peak hour or in the flat peak hour are lower in the coordination state than in the non-coordination state; and passengers' travel cost are reduced more significantly than operation cost of joint coordination system. This can significantly increase passengers' satisfaction and it is very favorable to the operators' long-term operation and intelligent control.
Study on Seismic Strengthening Demand of Damage Concrete Bridge Piers
Authors: Deng Jiang Dong , Zong Zhou Hong , Xia Zhang Hua
Published: June 2012

Initial damage often exists in the concrete piers of bridges in service. In this paper numerical analysis was used to study the seismic strengthening behavior of concrete bridge piers with different bending damage degrees, including seismic forces, pier top displacements, steel bar strain and energy dissipation, in order to obtain the strengthening demand to repair the damage piers. The results showing that: initial bending damage reduced the seismic force, increased the pier top displacements and the steel bar strain. After strengthening the pier top displacements and steel bar strain at the pier bottom decreased, energy dissipation increased, and the anti-seismic properties of damage piers effectively recovered, but the increase of the seismic force might make new plastic-hinges out the strengthened area. At last according to the mechanics properties the strengthening demand under different bending damage degrees was given.
Research on Temperature Field and Temperature Stress of Large Span Concrete Cable-Stayed Bridge Girder
Authors: Yan Peng
Published: June 2012

Bridge structure is influenced by external temperature inevitably, and hyper static structure, especially cable-stayed bridge, has complicated stress response on the effect of temperature action, which greatly increases the difficulty of structure stress analysis. For the sake of research on the influence degree of temperature action to large span concrete cable-stayed bridge girder, take Luzhou Taian Yangtze River Bridge as an example, the temperature field and temperature stress of girder are analyzed using measured data from health monitoring system. The results of finite element simulation experiment demonstrate that, the influence of longitudinal temperature distribution must be considered in large span bridge design, and the measured data of bridge health monitoring system installed are accurate.
The Determination of the Problem of the Cable-Stayed Bridge Reasonable Superpositioning Optimization under the Constant Load State, Basing on the Unknown Load Coefficient Method of Midas/Civil
Authors: Yu Bao Chu , Gao Shao Xia , Gao Chao , Yang Jiang , Xie Bin
Published: June 2012

In the premise of structural parameters of not changing, cable-stayed bridge state by taking the reasonable force will become the optimization of cable-stayed bridge under constant load by taking the reasonable under the bridge state superpositioning optimization problem. Basing on the engineering background of Dachongyong bridge with finite element analysis software of Midas/Civil, taking the unknown load coefficient method of Midas/Civil as study platform, arounding the theme of the reasonable state of cable-stayed bridge, This paper make full use of the characteristic of cable forces can be adjust, introduced the method of superpositioning optimization algorithm in detail under the reasonable cable-stayed bridge state.
Analysis of Upside Additional Internal Force Imposed by Asymmetric Settlement of Broadened Bridge Foundation
Authors: Jiang Meng , Zhao Bao Jun , Yang Xiao Dong
Published: June 2012

Bridge upper hinge or just a widened, because of uneven settlement in upper structure based generate additional internal forces. To analysis Foundation does not uniform settlement on upper structure by force of effect, using niumake numerical analysis method on structure for analysis, established has new, and old bridge transverse mosaic Hou of simplified calculation formula, and on effect additional internal force of main factors for has analysis research, and results indicates that, using niumake numerical method on structure for simulation calculation comparison reasonable, and can using calculation structure anti-is foundation settlement difference allowed value, under on relying on engineering for calculation analysis, calculation out foundation of allows settlement value, Ensure the overall performance of widened bridge.
Investigation of Temperature Effects of Box-Girder Bridge in Typical Winter Weather of QINGHAI-TIBET Plateau
Authors: Liu Hao Su , Dong Jun , Liang Tian , Qi Zhi Gang , Xiang Xue Jian
Published: June 2012

Based on the engineering background as which a box-girder bridge under construction in typical winter weather of Qinghai-Tibet plateau is chosen, a diffusion equation of temperature of the structure has been established, whose choices of initial and boundary conditions are discussed according to the field monitoring data and local weather information including solar radiation and air convection. Secondly, some tests of numerical simulation have been done by FEM software, and related parameters of the model are obtained. Finally, based on the determinate parameters, the temperature fields of another box-girder bridge are simulated, which agree with the measured data in the field. All these show that the investigation is not only providing basic parameters for temperature loading in the control of construction process of the bridge, but also providing significant reference for the design and construction of the same kind of bridges in typical winter weather of Qinghai-Tibet plateau.
Method of High-Precision Calculation on the Linear Parameters for the Stay-Cable of the Cable-Stayed Bridge
Authors: Li Xi , Cai Ting Ting
Published: June 2012

From the cable-stayed the basic linetype equations,the cable-stayed parameter of engineering application value are derived. The simplifed calculation method of cable-stayed based on origin of moving coordinate method are presented, and then the simple and practical calculation of cable-stayed form are developed using a single variable solve and macro commands of excel. Finally, by comparison shows that the method is correct.
Calculation for Settlement of High Cap Extra-Long Large Diameter Pile Groups
Authors: Deng You Sheng , Zheng Jian Qiang , Wan Chang Zhong , He Shao Hua
Published: June 2012

The settlement of high cap extra-long large diameter pile groups is made up of pile elastic compression and settlement of soil layers under pile end in theory. Methods to calculate pile compression of high cap extra-long large diameter pile groups was deduced or listed. Six methods to calculate settlement of soil layers under pile end were expounded through extra-long large diameter pile groups under south tower of main bridge of Sutong Yangtse River Highway Bridges. The results show that piles’ elastic compression should be calculated into the settlement of extra-long large diameter pile groups, including that caused by pile’s own weight, and it is little difference between test value and total settlement which is composed of piles’ elastic compression calculated through the formula deduced in the paper and theoretic settlement of soil layers under pile end based on Mindlin’s additional stress solution, only making 0.06% lower.
The Analysis and Forecasting Model of the Energy Supply and Demand in Jiangxi Province
Authors: Wu Yuan Zhuo , Xu Qun , Fu Chun , Liu Lei
Published: June 2012

Abstract: Model which depends on historical data of Jiangxi Province ，grey system and Brown nonlinearity exponential smoothing has been constructed, then the paper uses of MATLAB software integration to calculate parameters, precision testing and result graphical output process to program the forecasting model .By establishing the future energy combination forecasting model of Jiangxi province with the standard deviation method, it can predict the energy gap of Jiangxi Province in following 12 year. The result shows that the whole energy gap will reach 561.206 million tons tce in 2009-2020.
Health State Evaluation of Continuous Girder Bridge Based on Fuzzy Analytic Hierarchy Process
Authors: Li Hai Tao
Published: June 2012

Based on fuzzy analytic hierarchy process, The model of bridge health evaluation is established using the quantification relations between the bridge technical state evaluation grade and degree of membership function of bridge health evaluation, making use of the computed result of various index of degree of membership value and weight, obtains all levels of fuzzy evaluation collection. According to the maximum membership principles to evaluate the technical state grade of bridge structure the corresponding level, and with its result to instruct the decision-making of bridge maintenance and strengthening.
Mechanical Analysis of Link Slab in Continous Paving Layer of Simple Supported Girder Bridge
Authors: Li Fan , Liu Xi Yuan , Wang Rong Xia , Wang Xiao Wei
Published: June 2012

The link slab of simple supported girder bridge deck was discussed in this paper. Based on “Gernal Code of design of Highway Bridges and Culverts(JTGD60-2004)” of China and linear elastic theory the continouse paving layer was analysized under the live load, temperature variation. The deformation and tensile stress formulations of link slab were given. The conclusion can provide theoretical basis for the design of building new bridge and strengthening and repairing old bridge.
Research on Energy-Saving Rebuilding Technologies for Existing Residential Buildings in South of Jiangsu Province
Authors: Bai Jian Bo , Zhang Yu , Hao Yu Zhe
Published: June 2012

Aiming at the problem of too much energy consumption of existing residential buildings in south of Jiangsu Province. In this paper，rebuilding technologies of energy efficiency for the buildings is proposed in detail, which including possible energy-saving measures for exterior walls, roofs, exterior windows, shadings and corridor in the existing buildings. An energy-saving reconstruction project example located in Hohai Xincun in Changzhou Xinbei District was presented and analyzed.
Analytical Solution to Vertical Dynamic Response of Simply Supported Beam Bridge Traversed by Successive Moving Loads
Authors: Zhang Zhi Jun , Wu Jin Feng , Song Li Zhong , Ma Song Hua , Li Xiao Zhen
Published: June 2012

In this paper, vibration theory is used to deduce vertical vibration’s analytical expressions of Euler- Bernoulli beam traveled by moving loads. In the analytical expression, the influences of the train’s travelling speed ,the mode of vibration ,the mass and rigidity of beam itself and the damping ratio of the system are considered comprehensively. Then the calculating program is made with MATLAB to analyze the dynamic response of a bridge as an illustrative example, so as to check the correctness of the analytical solution. Then a 32 meters simply supported beam traversed by moving loads of 8 ICE3 motor cars is analyzed. The calculation results show that the analysis method in this paper can really give accurate results to the beam subjected to arbitrarily spacing loads . The analytical expressions can be applied to preliminary design of railway bridges and assessment of the expected maximum vibration levels under high-speed trains.
The Finite Element Analysis of Prestressed Concrete Channel Bridge with Three Girders
Authors: Li Jing Bo , Lu Yuan Chun , Nie Zhi Hong , Xue Wei Chen
Published: June 2012

Prestressed concrete(PC) channel bridge, consisting of a PC deck slab, two PC girders and two end crossbeams, is a new type of bridge structures. The PC channel bridges have been widely used in the structures such as highway, railway as well as urban rail transport. This paper presents a finite element method (FEM) analysis of mechanical behaviours of channel bridges with three girders in the construction, service and ultimate limit stage. The primary results include:(1) the channel bridges act elastically in the construction stage. (2) under the service loads, the deflections in the mid-span and the stresses on the whole concrete cross section could meet the requirements of the current codes. (3) the FEA results of flexural capacity of the channel bridges agree well with the results calculated according to the current codes, and the average loads of flexural capacity are about 3.26 times the design loads.
Experimental Study on Mechanical Performance of Unbonded and Bonded Prestressed Concrete Beams
Authors: Su Jian , Yi Nan Gai , Sun Zong Guang , Bai Yang , Zhang Ai Guo
Published: June 2012

The experiment which based on the stress performance of unbonded and bonded prestressed concrete beam, has made a systematically research on the stress and strain variation law of pretressing tendon in the aforementioned reinforcement prestressed concrete structure. When the bonded prestressed concrete beam bearing load, there is a larger variation in stress and strain of prestressing reinforcement along the length. The maxima of stress and strain of prestressing reinforcement in bonded prestressed concrete beam appears in midspan, it is achieved the yield stress and yield strain, the minima appears in bearing, the stress and strain of prestressing reinforcement in bonded prestressed concrete beam is proportional to the distortion. The stress and strain of prestressed reinforcement in unbonded prestressed concrete beam is almost the same along the length.
About the Structural Robustness of Through Arch Bridges
Authors: Jiang Rui Juan , Wu Qi Ming , Chen Yi Yan , Yi Xiao Wei , Tu Jun
Published: June 2012

In EN1991-1-7 Eurocode 1: Part 1-7 Accidental Actions structural robustness is defined as ‘the ability of a structure to withstand events like fire, explosions, impact or consequences of human error without being damaged to an extent disproportionate to the original cause’. Accordingly, the principle of structural robustness is that local damage is acceptable, provided that it will not endanger the structure and that the overall load-carrying capacity is maintained during an appropriate length of time to allow the necessary emergency measures to be taken. For different structures the practical ways to achieve robustness are different. Lots of through arch bridges with hangers have been built throughout the world. However, the structural collapse may happen due to the hanger's damage or failure if the bridge is not designed appropriately. In this paper, the structural robustness of the through arch bridges with vertical hangers are discussed and verified by an example. Based on this study, a few practical suggestions are put forward to achieve the structural robustness for the future through arch bridges' design.
Renewable Energy Techniques – A Sustainable Model for Architects Regarding Physical Environment and Economic Empowerment of the Sub Urban and Rural Areas in Bangladesh
Authors: Rummana Ruba , Alam Ar.Silvia , Wahid Ar. Nusrat , Saifuzzaman Md.
Published: June 2012

This paper mainly concentrates on the energy crisis for a long time in Bangladesh. The government is trying its best to overcome this problem. Due to high investment requirement for conventional power plants, responses from the private sector for power generation are very poor. One alternative solution may be the expanded use of renewable energy. At present solar cells are in use for power generation. But due to high initial investment required for solar panel installation, this form of renewable energy has not been practiced much. The aim behind the study is to integrate the architectural planning regarding physical environment and power crisis problem which may lead to an ultimate improvement of socio economic scenario of the country. In doing so the paper proposes a hypothetical model using biogas as a source of renewable energy by using the rural waste-leading to cash from trash.
Influence of Side Stringer to Deck Deformation of Four-Lines High-Speed Railway Cable-Stayed Bridge with Double Cable Planes
Authors: Liang Jiong , Ye Mei Xin
Published: June 2012

Taking Beijiang Bridge as an example, using 3D finite element method, influence of side stringer to deck deformation of four-lines high-speed railway cable-stayed bridge with double cable planes is studied. The results show that the stiffness of the side stringer hardly influence the long wave of bridge deformation and the ratio of deflection to span, but significantly affects the short wave and transversal wave of the bridge deformation. The location of the side stringer influences the long wave slightly, but influences the short wave and transversal wave significantly. If the distance between the side stringer and the center of the main trusses changed, the long wave changes slightly, while the maximum short wave and transversal wave change a lot. The larger the distance, the less the transversal span of the deck and panel beams are, and the less the short wave and transversal wave are. The influence of the axial stiffness of horizontal K-shaped brace to the bridge deformation is small.
Numerical Analysis of Control Indexes in Design of Low-Pylon Cable-Stayed Bridge
Authors: Dou Sheng Tan , Chen Hai Hui , Cui Shen Gai , Zhu Jian Bo
Published: June 2012

Taking a low-pylon cable-stayed bridge as engineering background, control indexes in design of bridge were studied[1]. Designers often complete prestressing tendon adjustments based on the existing experience，which can only finish design conservatively rather than get correct results. In order to obtain relative accurate results, this article conduct relative reserch. Overall force calculation and later checking research is analysed by the finite element analysis software MIDAS Civil. Calculation and checking of the cable-stayed locks, prestressing tendon and other control indicators are in accordance with the relevant norms, and reasonable results can be obtained, which can provide a basis for similar bridges.
Research on Indoor Environment Pollutants and Controlling
Authors: Liu Jun , Zhuo Yu Guo , Ma Jin Xiang
Published: June 2012

The sources and harm of indoor environmental pollutants was described and a new green theory is put forward that indoor environment pollutants is controlled by overall process based on the residential interior decoration and air pollution status in China, as indoor environment quality becomes more and more important. According to the concept of healthy house to control indoor environment pollutants through five steps that are green interior design, selecting environmental materials, green decoration, green ornament and green fresh air, and healthy and environmental green home could be realized.
Indoor Scene Management Based on Portal Attributes Information
Authors: Zhang Hou Wei , Liu Hua
Published: June 2012

In this paper, we discuss the indoor scene management based on the portal attribute information. Focusing on the features of indoor scene, it describes a comprehensive definition of portal data structure, based on which we can analyze the scene connectivity easily. This portal structure provides a new method for visibility determination and also accelerates the speed of rendering in this system, which makes it easy to show the real mirror effect.
Reseach on Multimodal Logistics Emergency Decision System Based on GIS
Authors: Fu Xiao Feng , Zhang Juan , Sun Pei Hua
Published: June 2012

In order to reduce the loss of multimodal transport logistics , ensure the efficient, safe, realize the emergency state unified command, information sharing, coordination, rapid rescue, the study established the multimodal transport logistics emergency decision-making function modules, researched and developed application system of emergency decision based on GIS+GPS, and VC# technologies.The system is easy to use, compatibility, strong practicability, it can provide technical support and application value for multimodal logistics emergency rescue.
A Study on the Major Problems of Urban Traffic Impact Analysis
Authors: Xiao Xin Qiao
Published: June 2012

Traffic Impact Analysis (TIA) is an effective approach to solve the urban traffic problems, by analyzing and assessing the impact of the new development to the peripheral traffic generation and the inherent relationship between land use and its current traffic condition. Based on the experience from foreign literature review, this paper first discusses the necessity of introduction TIA to China, and then compares the relationships between (1) TIA and city transportation planning (CTP) and (2) the basic methodology and standards of TIA. From a systematic perspective, this paper introduces the main content of TIA, and finally objective conclusions are drawn. This study indicates that TIA is the essential solution to prevent conflict between new development and new development interregional traffic generation. The findings of this paper would promote both the research of introduction TIA to China and furthermore the implementation of TIA.