bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on the Scale and Platform of Sustainability Assessment for Area Scale Residential Development in China
Authors: Zhang Xiao Peng , Zhao Bo Yang , Qin Wei
Published: August 2013

It is the aim of this paper to discuss and search for the suitable scale and platform of sustainability assessment of area scale residential development in China, to contribute to the research of sustainability assessment and thus to promote the sustainable development in Chinese urbanization. The status quo of sustainability assessment in China and the scale definition of globe assessment tools for area scale are reviewed firstly to define the problem. And then, an analysis of Chinese urban system, land ownership and market and residential development are made to establish the combined hierarchical structure. Finally based on the previous research, residential district and regulatory plan are chosen by this research as the implement scale and platform of sustainability assessment for area scale residential development, together with the benefits analysis. The suggested assessment scale and platform could connect the existing sustainability assessment on city & building scale and promote sustainable development realize from targets to measures.
Coupled Vibration Analysis of Vehicle-Bridge System for Jinsha River Bridge
Authors: Han Xing , Zhu Bing , Wang Jun Ping , Liu Gui Man
Published: August 2013

Numerical simulation model to analyze the coupling vibration between vehicle and bridge established in this paper, upon the engineering background of Jinsha River Bridge. The finite element commercial software, ANSYS, is employed to set up the dynamic analysis model and to compute its natural vibration characteristics. Then CRH3 special refined model is built with SIMPACK, a multi-body dynamics commercial software. Considering the factors like track-rail irregularity, the dynamic performance of bridge and driving comfort level are obtained. The analysis results of coupled vibration demonstrate that bridge bears sufficient stiffness due to its satisfying vibration performance; the safety in operation of vehicle meets the requirement with the comfort index of "good". All the results not only provide reference for design, but also work as the theoretical basis for future design of similar bridges. The paper is deemed a s evidence of the priority of bridge-vehicle model by finite element method and multi-body dynamics method. The process of modeling turns to be stylized, which avoids the unnecessary programming for individual project.
Study on Orthotropic Deck Plate Fatigue Test Model Scheme of Box Girder of Railway Cable-Stayed Bridge
Authors: Han Bing , Pu Qian Hui , Shi Zhou , Gao Li Qiang , Zhou Yang
Published: August 2013

Yongjiang railway extra long-span cable-stayed bridge uses the orthotropic deck of steel box girder, and it is the first time that box girder used in the railway cable-stayed bridge, so it is necessary to do a research on the mechanics behavior of this structure with fatigue model test. The accuracy of the fatigue model test data results in the rationality of the test scheme, and the research contents of the test scheme are as follows: the finite element model of steel box girder has been built to analysis the characteristics of the stress distribution, and the fatigue-sensitive regions have been determined; three model schemes have been designed and compared under the principles of stress equivalence and economical efficiency , and the third model has been used as the final fatigue test model . The research result can provide reference for the design of fatigue test model scheme of the same kind of bridge.
Vehicle-Bridge Coupling Vibration Reduction Analysis for Long Span Highway and Railway Bi-Purpose Cable-Stayed Bridge
Authors: Chen Dai Hai , Li Zheng , Chen Huai , Guo Wen Hua
Published: August 2013

The vehicle and TMD were modeled as a combination of several rigid bodies, which were connected together by a series of springs and dampers, the bridge was modeled by beam elements, and thus the spatial vibration equation of the system of TMD, vehicle and bridge was established, which was solved by direct integral method. A highway and railway bi-purpose cable-stayed bridge was taken as an example, the spatial vibration responses were calculated when the train and car run through the bridge, and the influence of TMD on the vibration response was discussed. The results show that the bridge has the sufficient lateral and vertical stiffness, the train and car affect each other when they cross the bridge at the same time, and TMD can play a good role in controlling the vibration response of long span cable-stayed bridge-train-car coupling system.
Asymmetric of Continuous Rigid Frame Bridge Precamber and Construction
Authors: Tong Wan Quan
Published: August 2013

Prestressed concrete continuous rigid frame bridge has the advantages of no expansion joints, smooth driving the advantages,however, due to cross under serious scratch,seriously affect the service life of the bridge.Take a Large span asymmetric continuous rigid frame bridge of Guizhou as engineering background,use finite element Program Midas/Civil modeling,carried out Analysis of the construction process,And select a reasonable way to Set the bridge pre-camber,and provide reasonable data for the construction of control,to ensure the bridge structure linear reasonable.
Accounting of Carbon Emissions in Key Fields of Dongying City, Shandong Province
Authors: Li Zi Jun , Gong Can Juan
Published: August 2013

Industry, construction and transportation are the key fields of carbon emission. Based on the reality of Dongying City, and combined with relevant statistical data, carbon emissions in industry, construction and transportation of Dongying City are accounted objectively. The results show that carbon emission in key fields of Dongying City has a fast increasing tendency from 2005 to 2009. Among which, carbon emissions of industry account for the largest proportion with the five-year average of 82.04%, followed by the construction and transportation, with the five-year average of 12.77% and 5.19% respectively. Therefore, adjusting and optimizing industrial energy consumption in the key fields is crucial to carbon emission reduction of Dongying City. This has an important significance for Dongying City to achieve energy conservation, emission reduction and build a low-carbon ecological city.
Research on Hydrology Design and Checking of Bridges in Small and Medium Watersheds
Authors: Li Zheng , Chen Dai Hai , Chen Huai
Published: August 2013

In order to reduce the flood disaster of bridges in small and medium watersheds, a hydrology design and checking method, which was based on flow influence line, was put forward. The basic steps of this method are as follows: calibrate model by water marks and the corresponding rainfall series; calculate flow process line by loading rainfall series of design or checking frequency on calibrated model, and get design peak flow, design flood-peak stage, checking peak flow, checking flood-peak stage, etc; so hydrology design of new bridges and checking of existing bridges can be done. The results show that this method requires less parameter, and is convenient in practical application and reliable in calculation accuracy. Therefore, it is of great significance for new and existing bridges avoiding flood damages.
Study on Mechanical Behavior of Webs of Abrea Bridge
Authors: Pan Bao Lin , Liao Jun
Published: August 2013

PC box girder bridges with open-work webs, mechanical behaviour of which is half way between those of traditional plain web and lattice box girder, is a kind of new bridge form. As webs are not continuous, vertical force cannot travel by shearing effect in a classic way all along the deck, so the hollow web box girder designed bridge behaves very differently compared to usual plain web box girder bridges. In this paper, mechanical behavior of webs of Abrea Bridge in France was analyzed by using Ansys tool. PC box girder bridges with open-work webs have many good features such as artistic and economic, etc. It can be studied and applied further in the world.
Nonlinear Stability Analysis of Thin-Walled Pier
Authors: Dong Xiao Mei
Published: August 2013

Shell element was used to simulate thin-walled piers. Mander constitutive model was adopted for analysis about the material nonlinearity. By finite displacement theory the geometric nonlinearity effect was reckoned in stability analysis based on Updated Lagrangian formulation. Nonlinear stability analysis during different construction stages indicates that the stability of pier in cantilever stage is weakest. Considered the dual non-linearity, the stability coefficient descends distinctly.
The Application of Discrete Element Method in the Analysis of Stone Arch Bridge
Authors: Yu Yuan Xu , Zhang Yue
Published: August 2013

Demonstrate the feasibility of the discrete element method application in the stone arch bridge analysis. Put forward simulation and analysis methods of stone arch bridge with fracture and damage. Using UDEC two-dimensional discrete element analysis software to establish arch bridge model, establish a load test state and simulate the overload test, make a force and damage identification via analyzing the main bearing structure arch ring. Discrete element model calculation result has good consistency with the actually measured value. Using the discrete element method can be effectively considered discrete problems of masonry materials, and accurate simulate the discrete characteristics of arch bridge structure materials.
Evaluating the Spatial Pattern of Organic Agricultural Enterprises in China
Authors: Gu Bo Xuan , Wang Yu Hua , Li Yan Peng
Published: August 2013

In recent years, considerable worldwide development in organic agriculture has attracted widespread attention from scholars both within and outside China, driven by its effects on environmental protection, food safety and health, international green barriers, At present, most of the existing research focuses on the production technology, development mode and benefit evaluation of organic agriculture, with relatively less concern about the activities of organic agricultural enterprises. Based on the indicators of number of enterprises, number of certificates, and certificate types, this paper analyzes the features characterizing the spatial distribution of organic agricultural enterprises in China. The results show that there are significant spatial variations in degree of diversity, degree of concentration, and evolving trajectories. It suggests that provinces and autonomous regions should give full play to the regional comparative advantages in order to facilitate the development of different types of organic agriculture.
Parameter Analysis on High-Pier's Effective Length Factor of Fabricated Beam Bridge
Authors: Liu Peng , Li Yong Jun , Zheng Fei , Rui Jie
Published: August 2013

This paper illustrates the calculation method of effective length factor of the high-pier of fabricated beam bridge on the basis of Eulers formula by obtaining the critical force of first-order buckling according to the stability analysis. Engineering example is applied to calculate the effective length factor in the construction stage of fabricated beam bridge. Further, parameter analysis is used to study the variation of effective length factor and the influence of dead weight, non-ideal boundary conditions, the height and the radius of high-pier on it is evaluated. Results show that: there are many influencing factors acting on the effective length factor which cannot simply be represented by a fixed value and the calculation of the effective length factor should depend on the specific conditions of high-piers.
Research on Bridge Rapid Detection Assessment
Authors: Zhu Long Liang , Song Jin Bo
Published: August 2013

After the earthquake, rapid detection, assessment and emergency rob pass, the traffic is the important content and key link of rescue and relief work on the bridge earthquake damage suffered. The United States, Japan and China's Taiwan region is also a strong earthquake areas, due to the road traffic damage in earthquake, to these countries and regions for the seismic design of structures and strengthening technology, post-earthquake rapid assessment and development of traffic recovery technology. In our country, although the strong earthquakes occurred frequently, but as a result of the earthquake occurred in the remote, the population density of small area, so the lack of information about seismic influence on traffic roads, limits the development of related technology. Until the 1976 Tangshan earthquake, the earthquake caused complete paralysis of highway traffic, earthquake damage investigation on highway development of our country, for the subsequent revision of seismic design of highway engineering specification to play a role in promoting. The May 12, 2008 Wenchuan earthquake and April 14, 2010 Qinghai Yushu earthquake makes the traffic infrastructure severely damaged, resulting in post-earthquake relief work is blocked, delayed the rescue time, also exposed China's rapid detection of defects assessment and emergency maintenance repair technology technical reserves hidden dangers in post-earthquake highway bridge.
Characteristics of Force Transmission of the Junction for Steel-Prestressed Concrete Composite Continuous Beam Bridges
Authors: Yin Dong Jia , He Xiong Jun , Huang Qiao Lian
Published: August 2013

A steel-prestressed concrete composite continuous beam bridge is one of new type navigational bridge structures with economic and clear mechanic behaviors. The junction of steel and concrete beam is the critical part, which makes the two different materials to be continuous structural system and transfer different kinds of loads reasonably. This article takes the Chang Bridge which locates on G318 state road in Changxing County, Zhejiang Province as the background to analyze the characteristics of transferring bending moment in the junction by the finite element method. The results show that the junction of steel and concrete designed can transfer loads smoothly. Therefore, the junction can be further researched for extensive application.
Experimental Study of the Concrete Structure Performance Degradation of Songhua River Bridge
Authors: Song Zhan Ping , Yao Tian Bao
Published: August 2013

Songhua River Bridge is an important large concrete bridge engineering in China. Because it is located in complex environment, the reinforcing steel rust, freeze-thaw, artificial damage and washout will result in performance degradation of the concrete structure. The paper firstly invested the climatic environment and local corrosion environment. Then, according to the environment characters, studied the structure endurance degradation regulation combining the laboratory simulation tests and natural exposive tests. Made a group of concrete test specimens according to the true construction field material mixture ratio. The field experiments include air exposure, half soaking and full soaking tests. And the laboratory tests include freeze-thaw test, salt aspic test, chloride ion penetrant test, carbonization test, etc. Through test research, the paper gripped the degradation regulation of bridge concrete property. Then constructed the bridge concrete endurance degradation model, established the theoretical foundation for predict the large bridge service life.
Analysis of Continuous Girder Bridge Based on Different Codes
Authors: Liu Meng Ying , Liu Bang Zhe
Published: August 2013

As the object to continuous girder bridges of movable formwork construction,for the same real bridge according to the new code and old code respectively establish finite element mode and for the corresponding calculation and checked, through the comparative analysis about construct materials, calculation conditions and the calculation results, etc,to discuss the difference of the design results between the new standard and the old standard, in order to accumulated useful experience about designing new bridge and reinforcing and reforming old bridge.
Analysis the same Continuous Girder Bridge Based on Different Construction Methods
Authors: Liu Meng Ying , Xu Yue
Published: August 2013

As the object to a prestressed concrete continuous girder bridge, which is an actual bridge, finite element modes were established respectively for the same actual bridge in different construction methods. The calculation results were analyzed comparatively and then the difference of the design results between the two construction methods was discussed in the gravity of structures, combination for action effects and the reinforcement bars, in order to accumulate useful experience in designing bridges.
A Simplified Linear Approach for Elastic Collision Analysis between the Fixed Middle Pier and the 2-Span Continuous Girder
Authors: Peng Tian Bo , Han Lei , Shi Xian Fei
Published: August 2013

Based on a collision analysis between the fixed middle girder and the 2-span continuous girder in longitudinal direction, motion equations of the girder and the pier are established by mode decomposition method. Displacements’ relationship at the collision interface is used to establish the equation about the collision force, and Duhamel integrals in the equation are eliminated so as to get a 6 order homogeneous ordinary differential equation about the collision force. Then an approach to solve the equation is put forward. The analysis results show that the time history curve of collision force is a half sine waveform, and the initial velocity of girder towards pier top is proportional to the peak collision force but has nothing to do with the duration of collision.
Analysis on Vehicle-Bridge Coupling Vibration of FRP Deck and Steel Girders Bridge
Authors: Guo Shi Hui , Zhang Yin , Yin Xin Feng
Published: August 2013

The FRP slab bridge in this paper is modeled using the finite-element method to predict its modal characteristics. The interaction between the vehicle and the bridge is simulated by using a 3D vehicle-bridge coupled model considering the roughness of the bridge road surface. The dynamic response of the bridge is obtained in the time domain by using an iterative procedure employed at each time step. The influences of vehicle velocity, vehicle rigidity, and bridge surface roughness are investigated.
Research of Inservice Arch Bridge Superstructure Damage Status and Evaluation Index System
Authors: Zhang Ke Chao , Chen Jian Zhang , Jiang Han Wan , Liu Hai Qiang
Published: August 2013

Scientific and integrated index system is a basic approach to accurately assess actual structure state of inservice arch bridge. It could provide clear evaluation guidance to assessment work of existing bridges. What is more, it is aimed to avoid or reduce erroneous and omission judgement phenomenon of bridge damage assessment by the grassroots-level maintenance workers. Based on summation of variety common damage in common arch bridges, this paper adopts AHP (analytic hierults are aimed to provide effective method and basis to long-term, persistent damage evaluaarchy process) method to establish arch bridge superstructure damage evaluation model with structure member (or component), the restion of inservice arch bridge.
Study on the Full Scale Model Test for Pylon Segment of Cable-Stayed Bridge
Authors: Zhang Ling Mei
Published: August 2013

Anchorage zone of tower is a key part of cable-stayed bridge. Some factors such as powerful local concentrated forces, anchor forces from prestressed steels and weaken factors from hole make this area in complicated states. Analysis of strength performance at the anchorage zone of cable-stayed bridge tower has been attracted attention in bridge engineering. Full-scale model test and force analysis was carried out when a typical cable-stayed bridge was selected as the research object. Three stress states of anchorage zone are consider, that is under prestressing, under cable forces in completion state and under maximum cable force. Analysis of stress distribution and force transmission route in these states will provide a scientific basis for design and research work for the future.
The Design of a Vibration Reduction Test Platform of the Rigid Hinge Expansion Joint of Jiashao Bridge
Authors: Peng Tian Bo , Sun Bing , Han Lei
Published: August 2013

The temperature deformation of Jiashao Bridge is a serious problem. In order to solve this problem effectively, a kind of rigid hinge structure is adopted in the middle of the bridge. Unit sparse plate bridge expansion joint for multi-direction-displacement is installed on the rigid hinge of this bridge. Vibration reduction tests are needed to verify the performance of the expansion joint and the service condition of the bridge structure. In this paper, a finite element analysis of the rigid hinge expansion joint is performed and a vibration reduction test platform is designed.
Behavior Response Analysis of Long Span Rigid-Frame Bridge Considering Construction Error
Authors: Ma Shu Fen , Zhang Xie Dong
Published: August 2013

From the aspect of accumulated construction error of the bridge, the inaccuracy analysis method was put forward. Considering the two kinds of construction error case in construction stage, the inaccuracy response numerical model was built. The error effect to the bridge was researched quantitatively and qualitatively. The results demonstrate that more attention should be paid to the effects of two kinds of construction error on the stress and deformation of bridge. The study of sensitivity analysis of structural damage cases should also be engaged in the design and construction stage for the optimal reliability.
Analysis on Natural Vibration and Dynamic Response of Footbridge
Authors: Zhou Shi , Su Wei Feng , Guo Jun Li , Pu Qian Hui
Published: August 2013

According to vibration problem of the footbridge, the dynamic characteristics and dynamic responses of the footbridge were analyzed under pedestrian load. Based on one 22m×10 straight line footbridge, this paper established the spatial finite element model to analyze its natural vibration characteristics and discuss the effects on the natural vibration characteristics induced by both connection factors of beam ends and pedestrians weight. And then the dynamic responses of the footbridge caused by pedestrian dynamic load were calculated to analyze the structure stress. In addition, to analyze the calculation result of displacement responses so as to evaluate the comfort of pedestrians. The results show that the natural frequency is lower, and it will probably induce the resonance and larger dynamic response value under pedestrian load although the footbridge structure is safe. Moreover, reducing vibration methods and treatment measures to the footbridge were introduced, and the effective measure was suggested to reduce vibration amplitude at last.
Electrical Resistance Method for Fatigue Crack Detection of Steel Deck
Authors: Yuan Zhou Zhi Yuan , Ji Bo Hai , Fu Zhong Qiu , Liu Rong , Cheng Miao
Published: August 2013

The present study employs an electrical resistance method for fatigue crack detection in steel deck. The detection influential factors are analyzed via the finite element analysis under different electrode space and deck width. As a result, the electrode space influenced on detecting precision, and the smaller the better. The resistance measurement method is presented, and the formula of fracture damage ratio and the equivalent crack depth are established. It is proved by fatigue crack detection experiment of U-rib specimen, which shows that using electrical resistance method to detect fatigue crack is feasible.
Influence Analysis of Parameters Variation on Dynamic Characteristic for Concrete Filled Steel Tubulur Arch Bridge
Authors: Sun Hao , Li Xiao Gang , Liu Shi Lin
Published: August 2013

The main bridge of Zhengzhou Yellow River 2nd bridge is a concrete filled steel tubulur (CFST) arch bridge. Choosing the main bridge as the research object, the finite element procedure ANSYS was used to establish the 3D finite element dynamic model. In order to analyze the influence of structural Parameters variation on dynamic characteristic,17 different conditions were considered in the calculation and analysis process. The results show that the CFST arch bridge is a flexible structure. The vertical rigidity of the bridge is stronger than the lateral rigidity CFST arch rib. The changes of the transverse brace style have little effect on the vertical rigidity, but have great impacts on the lateral rigidity of the CFST arch rib. It is sensitive on the first step vibration if the bracing tube damage. But the bracing tube damage has little effect on the vertical rigidity. The damages of suspenders and bridge deck slabs influence weakly on the vibration modes.
Dynamic Modal Assessment of Old Reticular Steel Railway Bridges Undergoing Fatigue Deterioration
Authors: Islami Kleidi , Tecchio Giovanni , Modena Claudio
Published: August 2013

To reduce traffic disruption due to a live-cycle and seismic damage it is necessary to study the causes in infrastructures and bridges. When we talk about steel structures and in particular steel bridges, we know that they are very flexible and consequently easy to identify by ambient vibration methods. In a collaborative project between the University of Padua and the Italian Railway Authority, two old reticular steel bridges (1920) were subject to in-situ structural identification, demolition and consequent laboratory fatigue tests. On account to their similarity it was possible to acquire dynamic data for several days by using the same acquisition logger and 12 acceleration sensors After the data of the two analyzed reticular bridges have been filtered, accurate vibrating modes were identified by using both time and frequency domain techniques and the results were outstanding. In order to use best-fitted material characteristics in the elements of the structures, destructive and non-destructive tests were executed. The results permitted to realize very accurate finite element models and calibrate them for successive fatigue scenarios by comparing laboratory and numeric tests.
Study on Mechanical Properties and Field Monitoring of Ballastless CWR on the Bridge in High-Speed Railway
Authors: Chen Bo Jing , Cai Xiao Pei , Shi Xiao Bo
Published: August 2013

In the design of long-span bridge , it is necessary to lay the expansion regulator in order to reduce the beam-track interaction. Take the Zhengzhou-Xi’an high-speed railway as an example, the paper created a CWR mechanical model on the bridge using the finite element software ANSYS, proposed the deformation law of the structure and its stress characteristics. Based on the fiber grating testing technology, many monitoring points were laid on the Weihe bridge, to make a long-term monitoring. Processed the monitoring data about rail temperature and temperature force of the regulator, the CWR service conditions were assessed. The study shows that the scheme laying a set of regulator on the longest span Weihe bridge has greatly decreased the beam-rail interaction. All of its design parameters are reasonable. The operation safety indexes can completely meet the need of limits.
Evaluation of the Sustainable Development of the Energy and Chemical Industry Base in Northern Shaanxi
Authors: Hua Shan
Published: August 2013

The sustainable development of the northern Shaanxi area has been severely restricted by the increasingly serious issue of the environmental pollution and ecological destruction in the energy and chemical industry base there. This paper, based on the thorough analysis to the investigation data about the environmental status and the existing problems of energy and chemical industry base in northern Shaanxi, construct evaluation index system of the base sustainable development. The paper evaluated comprehensively the level of sustainable development in energy and chemical industry base in Northern Shaanxi based on statistical data in past years. It reveals the contradiction and the plight of economic, resource and environment in the process of current base, and shows the urgent problems which must be solved in the future.
Study on Moisture Modification for Resilient Modulus of Subgrade
Authors: Li Cong , Lan Wei
Published: August 2013

Subgrade resilient modulus of 3 typical soils, namely sand, silt and clay, have been measured under different conditions of 2 target dry density and 3 target water content by triaxial repeated-loading test. Analysis has been focused on the effect law of subgrade moisture and compaction for resilient modulus based on test results. Subgrade moisture has some impact on resilient modulus of test soils, especially on that of fine-grained soils. The influence degree of subgrde compaction depends on soil group. Coefficient of moisture modification has been introduced to characterize relationship between subgrade moisture and resilient modulus. Two-parameter Logistic model with inflexion control has been proposed according to the following basic rule. Coefficient of moisture modification usually increases or decreases along with the decrement or increment of subgrade moisture. And then variety rate of coefficient becomes small in state of high or low water content.
Comprehensive Assessment on the Life-Cycle Environment Impact of Railway Construction Projects
Authors: Wu Wen Jie , Wang Zhong Hao
Published: August 2013

There is a huge impact of railway projects on the regional environment. A life cycle assessment (LCA) framework using quantitative methodwas developed to evaluate the environment impact of railway projects quantitatively. The railway life cycle was divided into 5 phases: survey and design, raw materials processing, construction, operation, and demolition. The life cycle environmental impact for railway project was categorized into 5 grades: great negative influence, little negative influence, no influence, little positive influence, and great positive influence. Based on the improved AHP method, a quantitative method was introduced to evaluate comprehensive environmental impact of railway projects. A railway project was analyzed as a case study. The results show that the major environment impact is occurred during the phases of operation and demolition. It is demonstrated that the method is applicable to assess the life-cycle environmental impact of railway projects.
Safety Assessment on Retaining and Protecting of Deep Foundation Excavation Adjacent to the Existing Railway
Authors: Si Wen Jing , Wang Yu Jie , Gao Ying Fu , Zhou Hui
Published: August 2013

Mizhuo highway overpass crosses Jingha railway. Deep foundation excavation can cause the neighboring structure safety factor drops. To ensure the stability of the Jingha railway embankment, retaining and protecting of deep foundation excavation was set up around the foundation pit. The incremental calculation method was used to analyze the stress deformation of retaining pile and surface settlement near the deep foundation pit. The overall stability checking and anti-overturning stability checking of deep foundation excavation meet the specification requirements. The maximum horizontal displacement of retaining pile is 6.0 mm and 6.6 mm respectively. Surface settlement can not impact the existing railway embankment. In construction practice the retaining pile can be able to effectively ensure the safety of the neighboring structure and to reduce the probability of accidents.
Experimental Study on Coarse Aggregate of Stage Filling for Asphalt Pavement
Authors: Ma Li Jie , Wang Yu Liang , Zhang Jin Yu
Published: August 2013

Coarse aggregate is the role of the formation for embedded crowded skeleton structure, and provided the appropriate size for filling the voids for fine aggregate. It is the key of excellent road performance of the asphalt mixture. The reasonable composition of coarse aggregate have researched with stage filling, to ensure the structure of multistage embedded skeleton crowded, and meet the actual road changing performance requirements.
Orthogonal Analysis on Responses Indexes of Asphalt Pavement
Authors: Ye Ya Li , Zhuang Chuan Yi , Yang Jie , Zhou Yan
Published: August 2013

The asphalt layer thickness, base thickness, the modulus of the asphalt layer, base modulus and subgrade modulus are selected as the responses indexes of asphalt. The level of each factor corresponding parameters and test results table are established by orthogonal analysis for four-level table of five factors. This paper took the Shell Designing Software BISAR 3.0 as calculation tool to get the three-dimensional response results of the different kinds of asphalt pavement. Based on results, the course bottom tensile strain of the asphalt layer, subgrade compressive strain and maximum shear stress of asphalt pavement are analyzed by intuitive analysis, variance analysis, and sensitivity analysis. It is found that the sensitivity analysis is a more accurate analysis of the factors of the factor in the level of assessment indicators. Response to the degree of influence of various factors on the pavement mechanics, pavement structure design and material design should be selected according to road type of damage specifications. In accordance with the sensitivity analysis of the impact of factors based on balanced other design specifications.
Analysis of Dynamic Wind of Sound Barrier under High Speed Train
Authors: Shi Zhou , Guo Jun Li , Su Wei Feng , Zhang Shuang Yang
Published: August 2013

The special dynamic pulsating air pressure acting on the surface of sound barrier can be aroused by passing high speed train, making sound barrier structure and components prone to destruction and other issues. Based 3-D unsteady k-ε two-equation turbulent model, dynamic processes of high-speed trains passing the sound barrier region at different speeds and many factors are simulated and analyzed by using moving mesh finite volume method. The results of dynamic numerical calculated pulsating air pressure results and the effecting rule of various parameters were obtained, and compared with the measured data. It is showed that the air pressure value increases with the increasing train speed and the dynamic numerical calculated pulsating air pressure curves shape and effecting rule of parameters are all well matched with the measured data, but the air pressure value is slightly larger. At last, based on the results of numerical calculation, the addition of static air pressure value caused by high speed train is put forward.
An Analytic Solution to the Settlement under the Trapezoidal Distribution of the Strip Load of the Soft Soil Foundation
Authors: Zou Sheng Yong , Hua Yu Jiang , Dai Fei
Published: August 2013

In order to manage and control the settlement along the highway, and meet the needs of the project, it is necessary to study the settlement calculation and prediction methods. Based on the layer-wise summation method, the derivation of the analytic solution of the final settlement can be done through the use of the calculation mode of additional stress and the Integral transform. With an illustrative example, this paper compares the differences of the value of the settlement derived respectively by the specification method and the analytic method. The graphs give an intuitive indication of the performance of the methods, and enable determination of the cubic capacity of settlement of the whole project, laying the foundation for the calculation of the ripped-rock quantity.
Research on Transverse Distribution Characteristic of Traffic Stream for Super-Secondary Road with Four-Lane in Xinjiang Province
Authors: Chen Jian Yun , Tian Xiao Ping
Published: August 2013

In order to study the transverse distribution characteristics of the vehicles on super-secondary road with four-lane separated by double amber lines in Xinjiang province, the measured data about transverse position and speed of the vehicle were obtained in the provincial highway S205 of Bole region. The relationship between transverse position and speed of the vehicle with or without interference of opposite vehicles was studied by methods of mathematical statistics, The results indicated that interference of opposite vehicles would increase inside clear distance and reduce outside clear distance. In the case of a narrow road shoulder, the outside clear distance was more than 1metre in addition to individual vehicles.
The Different Road Surface Structure Combination Stress Contrast Analyse under the Axis Load
Authors: Gao Jian Hong
Published: August 2013

Based on the multi-layer elastic system theory , a large general used finite element software is used to analysis in the paper. To the asphaltum concrete surface layer pavement structure, the basic layer shares more load for surface layer along with the basic layer rigidity increasing. To the cement concrete surface layer pavement structure, the basic layer shares less load for surface layer along with the surface layer rigidity increasing. Whichsoever, the soil ground equivalent stress below subgrade 2m deep is almost not affected from the pavement structure layer rigidity change, but it will increase with the load increasing.
The Comparison between Dynamic Stress Intensity Factor and Static Stress Intensity Factor of Semi-Rigid Asphalt Pavement
Authors: Shan Jing Song , Du Bei Bei
Published: August 2013

Crack is the common and important distress mode of Semi-Rigid Asphalt Pavement . To simulate the dynamic property of vehicle, three dimensional dynamic FEM is made use of and moving load is imposed on the surface of pavement model in this paper. Dynamic stress intensity factor of reflective crack in pavement structure layers is got by calculating the road model with crack , then comparing stress intensity factor of mode I and mode II under moving load with them under static load. It is discovered that the maximum of dynamic stress intensity factor is bigger evidently than static stress intensity factor when reflective crack extends in base layer and sub-base layer, but the results are very close when reflective crack expands into surface layer.
Parameters Selection of Asphalt Pavement Compaction Based on Virtual Experiment
Authors: Zhao Xi
Published: August 2013

Compaction parameters directly affected the performance of bituminous pavement, but the complex mechanism and factors brought difficulty to their reasonable selection. A DEM (Discrete Element Method) model was set up to simulate the pavement compaction with different compaction times, compaction velocities and roller tonnages. Then reasonable operation parameters for given pavement were concluded with VCA (the Void of Coarse Aggregates) as an index to evaluate compaction effect, and the results took on a good consistency with construction experience and the specification in PR China.
Design of High-Speed Railway Train Dispatching Simulation Training System
Authors: Zhang Lin Qing , Han Bao Ming , Lu Fang
Published: August 2013

With China's high-speed railway are built in large quantities to a huge network, the new features of the high-speed railway present a severe challenge for train dispatching command. Therefore, development and design of high-speed railway train dispatching simulation training system is indispensable. This paper analyzes the requirement of the system, puts forward the overall structure of system, describes the data flow and designs the function modules. All work lays the foundation for the systems development and use. It has important significance in the cultivation of the high-speed railway transport professional talents and improves the railway transport information.
The Analysis of Recovery Asphalt Performance in Recycled Asphalt Mixture
Authors: Wu Hong Juan , Zhang Xin Yu
Published: August 2013

A laboratory study was carried to investigate the recycled asphalt performance of recycled asphalt mixture. The recycled asphalt mixture is from the Guaxing road in Gansu Province. By extraction tests and combustion method test on recycled asphalt mixture, the content of recovery asphalt, penetration, softening point and ductility were measured. The chemical composition testing and rheological testing were conducted on the recovery asphalt and new asphalt. Results indicate that the recovery asphalt contain the high proportion of asphaltenes and the low proportion of aromatics and resins. With temperature increasing, the decrease in the complex shear modulus (G*) of the recovery asphalt is much larger than that of the new asphalt,the increase in the phase angle of the recovery asphalt is much larger than that of the new asphalt, too. All these lead to the recovery asphalt harden, poor liquidity and plasticity.
Low-Temperature Cracking Analysis of Asphalt Pavement
Authors: Li Zhao Sheng , Tan Yi Qiu
Published: August 2013

Establish the mechanical model of asphalt pavement low-temperature cracking, analysis the factors leading to cracking. The factors such as shrinkage coefficient of asphalt pavementtemperature stresspavement structure combination forms and temperature contribution affect the asphalt pavement on cracking behavior. Study the effect of aggregate gradation type on asphalt mixture temperature shrinkage coefficient, analyze shows that in case of the same skeleton type, the smaller the average particle size of aggregate is, the larger low-temperature shrinkage deformation of mixture is; increasing the amount of coarse aggregate can form the dense structure of skeletonreduce the shrinkage coefficient at low temperature and improve the low-temperature crack resistance ability of asphalt mixture.
A New Method for Detecting Rail Short Wave Irregularity
Authors: Mao Xiao Jun , Li Hai Feng , Xu Yu De
Published: August 2013

In order to realize continuous detection of rail short wavelength irregularity and improve its detection precision, a new four-point method based on chord reference method is derived and presented. Then a simulation waveform consisting of 10 random sine waves has been used for scientific determination of the three separation distances. The new method’s automatic recovery program is developed by MATLAB. The restored waveforms are compared with the results from RMF-2.3E devices and thus the detection precision is achieved. Results show higher detection precision and reliability by over 87% relative percentage comparing to the traditional three-point method, which shows the great applicability and superiority of the new method.
Effects of New Generation Large Aircrafts on Flexible Runway Pavement
Authors: Zhang Lei , Yang Sun Xin , Wang Hua Rong , Wan Yu Jia
Published: August 2013

In this paper, influences of New Generation Large Aircrafts (NGLA) on the runway rutting were analyzed and the importance of combining laboratory performance tests and suitable analytically-based methodology was emphasized. Based on the multilayered elastic theory, the vertical compression stress distributions under different airplanes including NGLA were studied. Then the dynamic creep test was conducted to obtain the visco-plastic characteristics of pavement including three mixture types. Furthermore, the rutting depth under different airplane was predicted by employing the Shells method and the dynamic creep test results. The results showed rutting depth would be more significant by loading cycles of NGLA, compared with that by ordinary airplane. Suggestions composed of both the structural and material considerations were proposed for runway pavement design.
The Research on Unloading Time of Stack Preloading Based on the Measured Data
Authors: Yang Ji Xin , Liu Qian Rui , Zeng Zhao Da
Published: August 2013

Combined with practical engineering, the second-class level measured data is got via stack preloading experiment on the soft and weak railway subgrade. By using the hyperbolic method and three points method to fit subsidence curve, the post-construction settlement S (t =∞) and the settlement at any time S(t) is evaluated, then a reasonable unloading time is inferred by the comparison between S (t =∞) and S(t=180). Studies have shown that hyperbolic method and three points method can predict the post-construction settlement accurately, the time unloading six months after the stack is completed is quite reasonable.
Monolithic Roadbed's Mechanical Behavior Affected by Structural Thickness under Tram
Authors: Huang Chong Wei , Su Er Hao , Shao Xian Zhi , Zhang Yi , Wang Lie Ping
Published: August 2013

Based on ABAQUS software, a 3-D finite element model which content the nonlinear contact problems and contact-earth subgrade-monilithic was given to analysis the mechanical behavior of the monolithic roadbed. Mechanics behavior and deflection of the monolithic roadbed, deflection and compressive stress of earth subgrade evaluated in detail with respect to varied structure layer combination and materials parameters. The results indicate that the increase roadbed thickness can significantly reduce the monolithic roadbeds tensile stress, which can reach 1.042MPa. With the increase of the friction coefficient, level of tensile stress σdy, monolithic deflection Dd , the compressive stress σsz and deflection on earth subgrade were slightly reduced.
Evaluation of Land Saving Effect for Highway Construction Based on Composite Index Model
Authors: Li Xia , Ren Xi Long
Published: August 2013

In order to realize a comprehensive effect assessment of highway construction of different levels, the thesis builds up a system of evaluating indicators in a meso-level, which consists of three criteria—land saving amount, function and service level and comprehensive return of land usage. Moreover, it nails down the standard value of the land saving index, and determines practical value of each index by taking the actual situation of HengShui-DaMing section in DaQing-GuangZhou expressway into consideration, then carries out non-dimensional treatment to the index and builds a comprehensive index model by employing the multi-factor evaluation method based on entropy method empowerment. Multi-factor composite index model is a feasible approach to assess the land saving effect of a certain highway construction project, thus realizing the definition and comparative evaluation of land saving level.
Strategy and Tactics in Common Renovation of Ordinary Existing Housing
Authors: Yan Lei , Xu Qian Li , Zhou Wei Ran
Published: August 2013

This paper extends its field of research to renovation of ordinary existing housing, the greatest characteristic of which is little personality and few styles. Distinguishing from landmark building, renovation of ordinary existing building fabric calls for highly specific approaches in planning, construction, and implementation. We, the architects develop renovation ideas and principles applied to ordinary existing housing offering our view of advocating stage renovation and knowing the real demand of the end user. Based on this view, we have chosen one typical action to discuss the efficient strategy and tactics, that cover the key areas of revitalizing community space with a focus on territoriality and sharing, improving housing function and aesthetic transformation which mainly address the integrity of facade remodeling and function upgrade, two-scale design and detail show, and adopting appropriate technology with particular emphasis on economic cost and user comfort conditions. The exploration on strategy and tactics in common renovation of ordinary existing housing aims to present references and experiences to urban residential sustainable development from both the theoretical and practical fields.
The Analyze Study of Compacting Temperature and Road Performance of Warm Mix Asphalt Mixture (LEADCAP)
Authors: Zhao Hai Sheng , Chen Wei , Wang Xiao Yan
Published: August 2013

This paper used one kind of organic additive LEADCAP to reduce the compacting temperature of SBS WMA mixture, and compared the WMA mixture compacted by superpave gyratory compactor (SGC) with HMA mixture to determine the compacting temperature of WMA mixture. Rutting test, low temperature bending test, freeze-thaw indirect tension test, Hamburg Wheel-Track test and dynamic modulus were carried out to evaluate the road performance of WMA mixed with LEASCAP. The test result showed that the WMA mixed with LEADCAP had well performed high temperature stability, low temperature stability, water stability, rutting cracking resistance, and high dynamic modulus, the compacting temperature were 127 °C, and affectively reduced the compacting temperature of SBS WMA mixture.