检索结果-南通市图书馆

Frontiers of Structural and Civil Engineering 2018年第2期12卷 215-221页

作者： Pengfei LIU Dawei WANG Frederic OTTO markus oeser Institute of Highway Engineering RWTH Aachen University Aachen D52074 Germany

To facilitate long term infrastructure asset management systems, it is necessary to determine the bearing capacity of pavements. Currently it is common to conduct such measurements in a stationary manner, however the evaluation with stationary loading does not correspond to reality a tendency towards continuous and high speed measurements in recent years can be observed. The computational program SAFEM was developed with the objective of evaluating the dynamic response of asphalt under moving loads and is based on a semi-analytic element method. In this research project SAFEM is compared to commercial finite element software ABAQUS and field measurements to verify the computational accuracy. The computational accuracy of SAFEM was found to be high enough to be viable whilst boasting a computational time far shorter than ABAQUS. Thus, SAFEM appears to be a feasible approach to determine the dynamic response of pavements under dynamic loads and is a useful tool for infrastructure administrations to analyze the pavement bearing capacity.

关键词： semi-analytical finite element method bearing capacity asphalt pavements moving loads dynamic response

Approaches for a 3D assessment of pavement evenness data based on 3D vehicle models

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Traffic and Transportation Engineering(English Edition) 2015年第2期2卷 68-80页

作者： Andreas Ueckermann markus oeser Institute of Highway Engineering RWTH Aachen University

Pavements are 3D in their shape. They can be captured in three dimensions by modern road mapping equipment which allows for the assessment of pavement evenness in a more holistic way as opposed to current practice which divides into longitudinal and transversal evenness. It makes sense to use 3D vehicle models to simulate the effects of 3D surface data on certain functional criteria like pavement loading, cargo loading and driving comfort. In order to evaluate the three criteria mentioned two vehicle models have been created： a passenger car used to assess driving comfort and a truck-semitrailer submodel used to assess pavement and cargo loading. The vehicle models and their application to 3D surface data are presented. The results are well in line with existing single-track （planar） models. Their advantage over existing 1D/2D models is demonstrated by the example of driving comfort evaluation. Existing ＂geometric＂ limit values for the assessment of longi- tudinal evenness in terms of the power spectral density could be used to establish corre- sponding limit values for the dynamic response, i.e. driving comfort, pavement loading and cargo loading. The limit values are well in line with existing limit values based on planar vehicle models. They can be used as guidelines for the proposal of future limit values. The investigations show that the use of 3D vehicle models is an appropriate and meaningful way of assessing 3D evenness data gathered by modern road mapping systems.

关键词： Pavement evenness Assessment 3D vehicle model Loading Acceleration

Application of semi-analytical finite element method coupled with infinite element for analysis of asphalt pavement structural response

在线全文

学校读者我要写书评

暂无评论

Journal of Traffic and Transportation Engineering(English Edition) 2015年第1期2卷 48-58页

作者： Pengfei Liu Dawei Wang markus oeser Faculty of Civil Engineering RWTH Aachen University

A specific computational program SAFEM was developed based on semi-analytical finite element （FE） method for analysis of asphalt pavement structural responses under static loads. The reliability and efficiency of this FE program was proved by comparison with the general commercial FE software ABAQUS. In order to further reduce the computational time without decrease of the accuracy, the infinite element was added to this program. The results of the finite-infinite element coupling analysis were compared with those of finite element analysis derived from the verified FE program, The study shows that finite-infinite element coupling analysis has higher reliability and efficiency.

关键词： Asphalt pavement Structural response Semi-analytical finite element method ABAQUS Infinite elementFinite-infinite element coupling analysis

Application of semi-analytical finite element method to analyze asphalt pavement response under heavy traffic loads

在线全文

学校读者我要写书评

暂无评论

Journal of Traffic and Transportation Engineering(English Edition) 2017年第2期4卷 206-214页

作者： Pengfei Liu Dawei Wang markus oeser Faculty of Civil Engineering RWTH Aachen University Faculty of Civil Engineering University of Siegen

Accurate assessment of the impact of heavy traffic loads on asphalt pavements requires a computational model which is able to calculate the response of the pavement fast and precisely. Currently the most finite element analysis programs based on traditional methods have various limitations. A specific program SAFEM was developed based on a semi-analytical finite element method to overcome the problems. It is a three-dimensional FE program that requires only a two-dimensional mesh by incorporating the semi- analytical method using Fourier series in the third dimension. The computational accuracy and efficiency of the program was verified by analytical verification previously. The experimental verification is carried out in this paper and the results show that the SAFEM is able to predict the mechanical responses of the asphalt pavement. Using the program SAFEM, the impact of heavy traffic loads was analyzed in terms of stress and strain dis- tribution, surface deflection and fatigue life. The results indicate that if the asphalt pave- ment is subjected to the heavy traffic load more, the thicknesses and stiffness of the pavement structural layers should be increased adequately in order to support the surface deflection, The compressive stress in asphalt binder course is relatively large and increases more significantly compared with that in the other asphalt layers when the axle load becomes larger. With comparison of the predicted fatigue life, the increase of the axle load will lead to the destruction of the asphalt pavement extremely easily.

关键词： Asphalt pavement response Heavy traffic loads SAFEM Deflection Stress Fatigue

Calculation of skid resistance from texture measurements

在线全文

学校读者我要写书评

暂无评论

Journal of Traffic and Transportation Engineering(English Edition) 2015年第1期2卷 3-16页

作者： Andreas Ueckermann Dawei Wang markus oeser Bernhard Steinauer Institute of Highway Engineering RWTH Aachen University

There is a wide range of routine skid resistance measurement devices on the market. All of them are measuring the friction force between a rubber wheel and the wetted road surface. Common to all of them is that they are relatively complex and costly because generally a truck carrying a large water tank is needed to wet the surface with a defined water layer. Because of the limited amount of water they can carry they are limited in range. Besides that the measurement is depending on factors like water film thickness, temperature, measurement speed, rubber aging, rubber wear and even road evenness and curviness. All of these factors will affect the skid resistance and are difficult to control. We present a concept of contactless skid resistance measurement which is based on optical texture measurement and consists of two components： measurement of the pavement texture by means of an optical measufin~ system and calculation of the skid resistance based on the measured texture by means of a rubber friction model. The basic assumptions underlying the theoretical approach and the model itself based on the theory of Persson are presented. The concept is applied to a laboratory device called Wehner/Schulze （W/S） machine to prove the theoretical approach. The results are very promising. A strong indication could be provided that skid resistance could be measured without contact in the future.

关键词： Skid resistance Contactless measurement Pavenent texture Rubber friction model

Characterization of road surfacing aggregates based on their mineralogical fingerprint

在线全文

学校读者我要写书评

暂无评论

Journal of Traffic and Transportation Engineering(English Edition) 2022年第5期9卷 880-891页

作者： Dawei Wang Yulin He Chonghui Wang Zeyu Zhang Guoyang Lu Pengfei Liu markus oeser School of Transportation Science and Engineering Harbin Institute of TechnologyHarbin 150090China Institute of Highway Engineering RWTH Aachen UniversityAachen 52074Germany Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongChina

To ensure the safety of infrastructure users,the long-term skid resistance is a crucial factor and is determined in large by the mineralogical and morphological characteristics of surfacing *** studies have investigated these aggregate properties separately without considering the interrelation between one *** objective of this study is to consider the morphological characteristics as well as the mineralogical fingerprint of aggregate to develop an innovative approach to optimize the aggregate selection *** investigations are based on 11 different aggregate types with a broad range of mineralogy,commonly used in *** long-term influence of polishing and wearing on the surface aggregate was simulated by means of the Aachen Polishing Machine and the MicroDeval test *** evaluate the impact of these tests,the aggregate shape was characterized by means of an imaging system called Aggregate Image Measurement System while the skid resistance of aggregates was evaluated with the British Pendulum *** test results show that the quartz and calcite are the key crystals to determine the anti-wear resistance of aggregates.A correlation between the skid resistance,morphological properties and mineralogy is derived,which proves the mineralogical fingerprint technology is practical for characterization of aggregates used in pavement surface layers.

关键词： Skid resistance Morphological properties Mineralogical fingerprint identification Road surface Accelerating polish

Study of the influence of pavement unevenness on the mechanical response of asphalt pavement by means of the finite element method

在线全文

学校读者我要写书评

暂无评论

Journal of Traffic and Transportation Engineering(English Edition) 2018年第3期5卷 169-180页

作者： Pengfei Liu Visaagan Ravee Dawei Wang markus oeser Institute of Highway Engineering RWTH Aachen University School of Transportation Science and Engineering Harbin Institute of Technology

Pavement unevenness affects the vehicle operating cost, speed, riding comfort, safety, pavement service life and etc. The current mechanistic-empirical （M-E） design procedure of asphalt pavements is based on the computational model of a flat pavement instead of uneven pavement as it is the case in reality. In this paper, a tire-pavement-interaction FE model is developed to investigate the influence of pavement unevenness on the mechanical responses of asphalt pavements. For both winter and summer conditions, the strain at the bottom of the asphalt layer due to the tire load is found to decrease as the wavelength of the unevenness increases. Moreover, the strain is larger at lower speeds and decreases as the speed increases. It is found that the stress levels are higher in summer conditions than under winter conditions for the same pavement irrespective of wavelength. The fatigue life increases with increase in speed of the tire for a pavement and also increases with increase in the wavelength of the pavement unevenness. The results indicate that pavement unevenness significantly influence the mechanical responses of asphalt pavements and thus influences the service life of asphalt pavements. As a result, the current M-E design algorithm of asphalt pavements should be modified to consider the pavement unevenness to allow better design processes for asphalt pavement.

关键词： Pavement Unevenness Mechanics Finite element method (YEM) Interaction

Advanced industrial informatics towards smart,safe and sustainable roads:A state of the art

在线全文

学校读者我要写书评

暂无评论

Journal of Traffic and Transportation Engineering(English Edition) 2023年第2期10卷 143-158页

作者： Hui Yao Zijin Xu Yue Hou Qiao Dong Pengfei Liu Zhoujing Ye Xin Pei markus oeser Linbing Wang Dawei Wang Beijing Key Laboratory of Transportation Engineering Faculty of ArchitectureCivil and Transportation EngineeringBeijing University of TechnologyBeijing 100124China Department of Civil Engineering Swansea UniversitySwansea SA28PPUK School of Transportation Southeast UniversityNanjing 211189China Institute of Highway Engineering RWTH Aachen UniversityAachen D52074Germany National Center for Materials Service Safety University of Science and Technology BeijingBeijing 100083China Department of Automation Tsinghua UniversityBeijing 100084China School of Environmental CivilAgricultural and Mechanical EngineeringUniversity of GeorgiaAthensGA 30602USA School of Transportation Science and Engineering Harbin Institute of TechnologyHarbin 150006China

The road is one of the most important civil infrastructures for serving society,where its service quality and life have direct impacts on the safety and comfort of ***,road construction,condition detection and monitoring,and timely maintenance are particularly important for *** engineering applications of industrial informatics approaches,like image processing technology,widely used computer-based algorithms,and advanced sensors,have been initially and gradually applied to *** state-of-the-art review first summarized the research on industrial applications of advanced information technologies in recent years,while analyzing and comparing the advantages and disadvantages of each ***,five topics were focused on road construction,road maintenance with decision strategy,road structure evaluation,smart sensing in the road,and cooperative vehicle infrastructure *** is expected that advanced industrial informatics can help engineers promote the development of smart,safe,and sustainable roads.

关键词： Advanced industrial informatics Road construction Road maintenance Decision strategy Pavement structure and material Smart sensing Cooperative vehicle infrastructure system

在线全文

学校读者我要写书评

暂无评论

德国不限速高速公路路面平整度评价方法综述

中国公路学报 2019年第4期32卷 105-113,129页

作者：王大为王宠惠 STEINAUER Bernhard 谭忆秋 oeser markus 哈尔滨工业大学交通科学与工程学院黑龙江哈尔滨150090 亚琛工业大学公路工程研究所北莱茵-威斯特法伦亚琛52074 哈尔滨工业大学城市水资源与水环境国家重点实验室黑龙江哈尔滨150090

平整度是衡量路面质量、评价行车舒适度的重要指标。德国拥有12.993万km的高速公路,其中约2/3的路段没有速度限制,因此德国交通管理部门对路面的功能性和安全性提出了极高的要求。针对上述课题,首先介绍中国"超级公路"的建设背景和需求... 详细信息

平整度是衡量路面质量、评价行车舒适度的重要指标。德国拥有12.993万km的高速公路,其中约2/3的路段没有速度限制,因此德国交通管理部门对路面的功能性和安全性提出了极高的要求。针对上述课题,首先介绍中国"超级公路"的建设背景和需求,强调德国路面的平整度指标对中国道路建设的重要借鉴意义;然后回顾国内外道路平整度的评价和预测等研究手段与方法,介绍德国基于功率谱密度曲线的平均不平整指数(AUN),分析将功率谱密度曲线转化为高度-波长曲线的优点,叙述考虑人车振动反应的有效平整度指数(LWI),简述加权纵断面评价方法(WLP)的思路和步骤;最后总结德国路面平整度评价体系的发展趋势和对于中国道路平整度研究的借鉴与应用前景。

关键词：道路工程德国道路综述超级公路路面平整度评价指标

Texturing and evaluation of concrete pavement surface:A state-of-the-art review

在线全文

学校读者我要写书评

暂无评论

Journal of Road Engineering 2023年第3期3卷 252-265页

作者： Zhen Leng Zepeng Fan Pengfei Liu Jonas Kollmann markus oeser Dawei Wang Xi Jiang Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongChina School of Transportation Science and Engineering Harbin Institute of TechnologyHarbin 150090China Institute of Highway Engineering RWTH Aachen UniversityAachen D52074Germany

Concrete pavement is accompanied by two major functional properties,namely noise emission and friction,which are closely related to pavement surface *** several technologies have been developed to mitigate tirepavement noise and improve driving friction by surface texturization,limited information is available to compare the advantages and disadvantages of different surface *** this study,a state-of-the-art and state-of-thepractice review is conducted to investigate the noise reduction and friction improvement technologies for concrete pavement *** commonly used tests for characterizing the surface texture,skid resistance,and noise emission of concrete pavement were first ***,the texturing methods for both fresh and hardened concrete pavement surfaces were discussed,and the friction,noise emission and durability performances of various surface textures were *** is found that the next generation concrete surface(NGCS)texture generally provides the best noise emission performance and excellent friction *** exposed aggregate concrete(EAC)and optimized diamond grinding textures are also promising ***,the technical parameters for the application of both diamond grinding and diamond grinding&grooving textures were recommended based on the authors'research and practical experience in Germany and the *** study offers a convenient reference to the pavement researchers and engineers who seek to quickly understand relevant knowledge and choose the most appropriate surface textures for concrete pavements.

关键词： Concrete pavement Surface texture Friction Noise emission Diamond grinding&grooving