期刊文献+
共找到2,057篇文章
< 1 2 103 >
每页显示 20 50 100
Bamboo Fiber Modified Asphalt Mixture Proportion Design and Road Performances Based on Response Surface Method
1
作者 李海滨 SUN Jianmei +3 位作者 WANG Sirui ZHANG Mingming HU Yihong SHENG Yanping 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2023年第1期156-170,共15页
In order to comprehensively utilize the remaining bamboo residue of bamboo products,this paper presents a research on recycling the bamboo fibers from bamboo residue for improving the performance of the asphalt mixtur... In order to comprehensively utilize the remaining bamboo residue of bamboo products,this paper presents a research on recycling the bamboo fibers from bamboo residue for improving the performance of the asphalt mixtures.First of all,the basic performance parameters of sinocalamus affinis fiber,phyllostachys pubescens fiber,green bamboo fiber were tested and analyzed,and the optimal content and length were put forward.Then,the mix ratio design of the bamboo fiber modified asphalt mixture was further designed through the response surface method,and was verified the rationality of the mix ratio.Finally,the mixture specimens were made according to the experimental design mix ratio,and the high temperature,low temperature performance and moisture susceptibility of the bamboo fiber modified mixtures asphalt were tested.The results showed that the high temperature performance,low temperature performance and moisture susceptibility of bamboo fiber modified asphalt mixtures were improved compared with the performance of SBS modified asphalt mixture.When the length of bamboo fiber is 7.25 mm and the content of 0.22%,the road performance of the asphalt mixture was optimal.Consequentially,the decomposition of bamboo residue into bamboo fiber and its application in asphalt pavement can improve the reuse of bamboo waste,with remarkable environmental benefits and great promotion value. 展开更多
关键词 bamboo fiber response surface method asphalt mixture proportion design road performances bamboo waste
下载PDF
A Comprehensive Evaluation of State-of-the-Art Deep Learning Models for Road Surface Type Classification
2
作者 Narit Hnoohom Sakorn Mekruksavanich Anuchit Jitpattanakul 《Intelligent Automation & Soft Computing》 SCIE 2023年第8期1275-1291,共17页
In recent years,as intelligent transportation systems(ITS)such as autonomous driving and advanced driver-assistance systems have become more popular,there has been a rise in the need for different sources of traffic s... In recent years,as intelligent transportation systems(ITS)such as autonomous driving and advanced driver-assistance systems have become more popular,there has been a rise in the need for different sources of traffic situation data.The classification of the road surface type,also known as the RST,is among the most essential of these situational data and can be utilized across the entirety of the ITS domain.Recently,the benefits of deep learning(DL)approaches for sensor-based RST classification have been demonstrated by automatic feature extraction without manual methods.The ability to extract important features is vital in making RST classification more accurate.This work investigates the most recent advances in DL algorithms for sensor-based RST classification and explores appropriate feature extraction models.We used different convolutional neural networks to understand the functional architecture better;we constructed an enhanced DL model called SE-ResNet,which uses residual connections and squeeze-and-excitation mod-ules to improve the classification performance.Comparative experiments with a publicly available benchmark dataset,the passive vehicular sensors dataset,have shown that SE-ResNet outperforms other state-of-the-art models.The proposed model achieved the highest accuracy of 98.41%and the highest F1-score of 98.19%when classifying surfaces into segments of dirt,cobblestone,or asphalt roads.Moreover,the proposed model significantly outperforms DL networks(CNN,LSTM,and CNN-LSTM).The proposed RE-ResNet achieved the classification accuracies of asphalt roads at 98.98,cobblestone roads at 97.02,and dirt roads at 99.56%,respectively. 展开更多
关键词 road surface type classification deep learning inertial sensor deep pyramidal residual network squeeze-and-excitation module
下载PDF
Technologies for Asphalt Pavement Surface Testing in Road and Bridge Construction
3
作者 Lu Zhang Guangjun Li +1 位作者 Lin Nan Shuyan Liu 《Journal of Architectural Research and Development》 2023年第2期1-5,共5页
Asphalt pavement is currently one of the main components in the construction of roads and bridges.However,from a practical point of view,various quality problems are prone to occur in the surface layer of asphalt pave... Asphalt pavement is currently one of the main components in the construction of roads and bridges.However,from a practical point of view,various quality problems are prone to occur in the surface layer of asphalt pavement,which will lead to the poor overall quality of road and bridge projects.Therefore,it should be applied reasonably.Advanced testing technologies are used to test the mixture quality,compaction,segregation,thickness,and other aspects of the asphalt pavement surface layer,so as to improve the quality of the asphalt pavement surface layer,and then improve the overall quality of road and bridge construction.Therefore,this paper mainly analyzes the technologies for asphalt pavement surface layer testing in road and bridge engineering construction. 展开更多
关键词 Asphalt pavement surface layer road and bridge engineering construction Testing technology
下载PDF
DEPTH PREDICTION OF RAIN WATER ON ROAD SURFACE BASED ON ARTIFICIAL NEURAL NETWORK 被引量:2
4
作者 季天剑 安景峰 +1 位作者 何申明 李春雷 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2006年第2期115-119,共5页
A model based on the non-linear artificial neural network (ANN) is established to predict the thickness of the water film on road surfaces. The weight and the threshold can be determined by training test data, and t... A model based on the non-linear artificial neural network (ANN) is established to predict the thickness of the water film on road surfaces. The weight and the threshold can be determined by training test data, and the water film thickness on the road surface can be accurately predicted by the empirical verification based on sample data. Results show that the proposed ANN model is feasible to predict the water film thickness of the road surface. 展开更多
关键词 overland flow gradation of asphalt mixture artificial neural network depth of rain water on road surface
下载PDF
SIMULATION ANALYSIS OF INFLUENCE OF ROAD SURFACE ROUGHNESS ON TYRE DYNAMIC PERFORMANCE IN AUTOMOTIVE BRAKING
5
作者 左曙光 张琦 韩柏东 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2000年第1期42-47,共6页
Using a nonlinear time varying tyre model, this paper simulatively analyzes the influence of road surface roughness amplitude and road spatial frequency on automobile ground adhesion ability. The result shows that wi... Using a nonlinear time varying tyre model, this paper simulatively analyzes the influence of road surface roughness amplitude and road spatial frequency on automobile ground adhesion ability. The result shows that with the increase of road surface roughness, the tyre adhesion ability declines, and the automotive braking distance increases. Moreover, the reliability of the nonlinear time varying tyre model in reflecting the influence of the road surface roughness is validated. It is testified that this model is an effective dynamic one in the simulation of automotive braking performance on uneven road. 展开更多
关键词 road surface roughness braking process SIMULATION tyre model
下载PDF
Automated extraction of expressway road surface from mobile laser scanning data 被引量:3
6
作者 TRAN Thanh Ha TAWEEP Chaisomphob 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第7期1917-1938,共22页
This paper presents a voxel-based region growing method for automatic road surface extraction from mobile laser scanning point clouds in an expressway environment.The proposed method has three major steps:constructing... This paper presents a voxel-based region growing method for automatic road surface extraction from mobile laser scanning point clouds in an expressway environment.The proposed method has three major steps:constructing a voxel model;extracting the road surface points by employing the voxel-based segmentation algorithm;refining the road boundary using the curb-based segmentation algorithm.To evaluate the accuracy of the proposed method,the two-point cloud datasets of two typical test sites in an expressway environment consisting of flat and bumpy surfaces with a high slope were used.The proposed algorithm extracted the road surface successfully with high accuracy.There was an average recall of 99.5%,the precision was 96.3%,and the F1 score was 97.9%.From the extracted road surface,a framework for the estimation of road roughness was proposed.Good agreement was achieved when comparing the results of the road roughness map with the visual image,indicating the feasibility and effectiveness of the proposed framework. 展开更多
关键词 mobile laser scanning SEGMENTATION road surface EXPRESSWAY VOXELIZATION point cloud
下载PDF
Change Characteristics and Forecast Research of Road Surface Temperature on Huyu Expressway (Hubei Section) 被引量:1
7
作者 Cheng Dan Fu Xiaohui 《Meteorological and Environmental Research》 CAS 2017年第5期92-99,104,共9页
In this paper,the monitoring data of road surface temperature,air temperature,wind speed,wind direction,relative humidity and precipitation from the automatic weather stations of Hurongxi,Hanyi,Wuhuang and Huanghuang ... In this paper,the monitoring data of road surface temperature,air temperature,wind speed,wind direction,relative humidity and precipitation from the automatic weather stations of Hurongxi,Hanyi,Wuhuang and Huanghuang on Huyu expressway from June 2013 to August 2014 were used to investigate the change characteristics of different sections' road surface temperatures in different seasons and sky conditions. The forecast models of the maximum and minimum road surface temperatures were established on different sections by statistical analysis methods,and the forecast results were verified. The results showed that the road surface temperature and air temperature of Hurongxi,Hanyi,Wuhuang and Huanghuang displayed obvious diurnal variation,but the difference between the road surface temperature and air temperature was larger. Compared with the other three sections,the maximum difference between the road surface temperature and air temperature on Hurongxi increased in winter and decreased in summer overall. The road surface temperature was close to air temperature on Hurongxi after sunset on sunny to cloudy and overcast in winter,while less than air temperature on Hanyi,Wuhuang and Huanghuang. The air temperature was less than road surface temperature on the four sections on rainy day and significant on Hurongxi. In summer,the air temperature was less than road surface temperature on the four sections under three sky conditions and the difference between them in afternoon was the biggest on sunny to cloudy and overcast. The road surface temperature was very close to each other among the four sections in January,while which was rising with the decrease of altitude in April,July and October. The forecast result of the road surface temperature was close to actual result on Hurongxi and Huanghuang,so which can be for reference. But there were some big errors between the forecast result and actual result in several timings on Hanyi and Wuhuang,so the forecast result should be corrected for actual business work. 展开更多
关键词 road surface TEMPERATURE Variation CHARACTERISTICS FORECAST model Test
下载PDF
New Method of Road Surface Identification in Anti-Lock Braking System 被引量:1
8
作者 齐志权 刘昭度 +1 位作者 张景波 马岳峰 《Journal of Beijing Institute of Technology》 EI CAS 2005年第1期67-70,共4页
Based on the vehicle-road dynamic model, the road characteristic parameter, which depends on different types of road surfaces, is introduced and a new method of road surface identification for automotive anti-lock bra... Based on the vehicle-road dynamic model, the road characteristic parameter, which depends on different types of road surfaces, is introduced and a new method of road surface identification for automotive anti-lock braking system (ABS) is proposed. According to the characteristics of vehicle-road dynamic model, a simple math resolution method of the model's factors is established. Only using the information of wheel speed, the vehicle reference velocity and the wheel slip ratio are estimated real-timely. And based on the wheel dynamic model, the road characteristic parameter is determined to identify the road surface for the determination of thresholds of ABS regulative parameters. With this new method, the road surface identification can be accurately obtained and calculation time is short that it can meet the ABS real time control need, and it also improves the performance of ABS. 展开更多
关键词 vehicle-road dynamic model road surface identification anti-lock braking system
下载PDF
Multi-objective genetic algorithm for the optimization of road surface cleaning process 被引量:1
9
作者 CHEN Jie GAO Dao-ming 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2006年第8期1416-1421,共6页
The parameters affecting road surface cleaning using waterjets were researched and a fuzzy neural network method of calculating cleaning rate was provided. A genetic algorithm was used to configure the cleaning parame... The parameters affecting road surface cleaning using waterjets were researched and a fuzzy neural network method of calculating cleaning rate was provided. A genetic algorithm was used to configure the cleaning parameters of pressure, standoff distance, traverse rate and angle of nozzles for the optimization of the cleaning effectiveness, efficiency, energy and water con-sumption, and a multi-objective optimization model was established. After calculation, the optimized results and the trend of variation of cleaning effectiveness, efficiency, energy and water consumption in different weighting factors were analyzed. 展开更多
关键词 OPTIMIZATION Waterjets road surface cleaning Genetic algorithm MULTI-OBJECTIVE
下载PDF
Evaluation of Tactile Ground Surface Indicators Installed on Sidewalks Beside Ninghai Road of Nanjing Based on Fuzzy Comprehensive Evaluation
10
作者 HONG Xiaochun LIU Yanan +1 位作者 LIU Pin JI Xiang 《Journal of Landscape Research》 2019年第5期16-22,共7页
In recent years,tactile ground surface indicators have been vigorously constructed in all cities and towns in China,and the length of tactile ground surface indicators has been regarded as one of the standards for mea... In recent years,tactile ground surface indicators have been vigorously constructed in all cities and towns in China,and the length of tactile ground surface indicators has been regarded as one of the standards for measuring urban civilization construction.However,there are many problems in the actual use of tactile ground surface indicators,and the construction of a large number of tactile ground surface indicators has not had a positive impact on the travel of the visually impaired.With the sidewalk of Ninghai Road in Nanjing,Jiangsu,China as the object of study,this study constructed an evaluation system of tactile ground surface indicators installed on the sidewalk beside a road and determined its weight,evaluated the tactile ground surface indicators installed on sidewalks beside Ninghai Road from the perspective of the visually impaired,using fuzzy comprehensive evaluation,and obtained the satisfaction of each indicator and analyzed the reasons of the indicator results.This set of evaluation system can provide basic ideas for the targeted evaluation of tactile ground surface indicators installed on the sidewalk beside a road based on different urban districts,different urban road grades,and different urban environmental conditions. 展开更多
关键词 TACTILE GROUND surface indicator Fuzzy comprehensive EVALUATION Ninghai road of NANJING
下载PDF
Developing a Durable Quiet Road Surface
11
作者 Matthew Muirhead Iswandaru Widyatmoko 《Sound & Vibration》 2018年第3期2-5,共4页
Road traffic noise can have a significant impact on the quality of life for residents close to major road networks.One of the most effective measures for reducing the noise from road traffic,particularly on high-speed... Road traffic noise can have a significant impact on the quality of life for residents close to major road networks.One of the most effective measures for reducing the noise from road traffic,particularly on high-speed roads,is to ensure the use of a low noise road surface.Research on pavement construction and the measurement of its acoustic properties has shown that significant noise reductions can be achieved through the use of certain road surface types.However certain low noise road surfaces do not exhibit the desired durability associated with more traditional pavements,leading to costly and disruptive maintenance regimes.This article looks at the mechanisms involved in tyre/road noise generation and how these interact with various road surface properties including a brief overview of some common surface types.It then goes on to explain how these concepts informed the development of an asphalt surfacing material with enhanced durability and good acoustic performance without compromising safety.Progress in testing the resulting Premium Asphalt Surfacing System(PASS)is outlined,including the completion of a successful network trial. 展开更多
关键词 ASPHALT oad surface low noise pavement tyre/road noise
下载PDF
Road Surface Condition and Monitoring System Utilizing Motorcycle(ROCOM)—System Development,Validation and Field Test
12
作者 Muhammad Marizwan Abdul Manan Muhammad Ruhaizat Abd Ghani 《Journal of Traffic and Transportation Engineering》 2018年第6期282-291,共10页
Motorcycles are the riskiest mode of travel in Malaysia,however motorcycles are also very sensitive to the road surface condition.Thus,by taking advantage of this,a system of software applications that analyses motorc... Motorcycles are the riskiest mode of travel in Malaysia,however motorcycles are also very sensitive to the road surface condition.Thus,by taking advantage of this,a system of software applications that analyses motorcycle motion and mapped out risky road sections was developed,i.e.ROCOM.The system consists of three major components,i.e.ROCOM Data Logger app,which utilizes a smart phone to collect acceleration data,ROCOM Risk Mapping app,which is a web-based application,and ROCOM Visual Tracking,which is a stand along software.ROCOM is able to detect adverse acceleration( >2g)or vibration on the road surface similar to the High Accuracy GPS Data Logging for Vehicle Testing(VBOX).Risk mapping validation along a section of the motorcycle lane along Federal Route 2 shows that not only ROCOM have the similar risk-mapping pattern,but its route tracking capability on the map is far superior that the VBOX.The pilot and field test results showed that ROCOM works best when mounting the smartphone on the motorcycle handle bar or basket,and it can detect various road anomalies with successful detection rate of 62%,with high detection rate when passing through uneven road surfaces. 展开更多
关键词 road surface CONDITION mobile and WEB-BASED application visual TRACKING data VALIDATION
下载PDF
A case study of environmental characteristics on urban road-surface and air temperatures during heat-wave days in Seoul
13
作者 KIM Yoo-Jun KIM Baek-Jo +3 位作者 SHIN Yoon-Sook KIM Hui-Won KIM Geon-Tae KIM Seon-Jeong 《Atmospheric and Oceanic Science Letters》 CSCD 2019年第4期261-269,共9页
High road-surface temperature due to heat waves can lead to dangerous driving conditions such as tire blowouts and deformation induced by thermal stress on the roads. In this study, a Mobile Observation Vehicle datase... High road-surface temperature due to heat waves can lead to dangerous driving conditions such as tire blowouts and deformation induced by thermal stress on the roads. In this study, a Mobile Observation Vehicle dataset, with high spatial and temporal resolutions for the heat-wave episode that occurred on 16–17 August 2018, is used to understand environmental characteristics on urban road-surface and air temperatures in Seoul. This study demonstrates that the magnitude of urban road-surface temperature is dependent on the differences in incoming solar radiation due to screening of high-rise buildings in the Gangnam area, and is associated with the topographical features in the Gangbuk area. The road-surface temperature in the section of darker-colored asphalts was higher than that of lighter-colored asphalts, with a mean difference of 6.8°C, and both surface and air temperatures on the iron plate were highest, with means of 51.7°C and 35.1°C,respectively. In addition, during the water-sprinkling period, road-surface temperature was cooled by about 8.7°C(19%) compared with that in the period without water-sprinkling, but there was no significant change in air temperature. The current results could be practically used to improve roadsurface temperature prediction models for civil engineers or road managers. 展开更多
关键词 Heat wave road-surface temperature mobile observation vehicle SEOUL
下载PDF
Error Analysis for the Three-Dimensional Detection and Reconstruction of the Road Surface
14
作者 Youquan He Jian Wang 《通讯和计算机(中英文版)》 2013年第6期873-876,共4页
关键词 误差分析 三维检测 公路路面 条纹中心线 错误处理 对比实验 质心算法 内部参数
下载PDF
Sustainability of lime stabilized road subgrade in mountainous regions of Türkiye
15
作者 Yavuz ABUT İlknur BOZBEY Ece KURT BAL 《Journal of Mountain Science》 SCIE CSCD 2023年第8期2436-2452,共17页
In this paper the use of lime stabilized subgrade for low volume roads in two regions with high mountains and different frost penetration conditions in Türkiye was investigated in terms of design,performance,and ... In this paper the use of lime stabilized subgrade for low volume roads in two regions with high mountains and different frost penetration conditions in Türkiye was investigated in terms of design,performance,and cost.Pavements on unstabilized and stabilized subgrade were designed for two regions(Izmir and Van),covering all climate variations.The resilient modulus of the lime stabilized subgrade with different soil pulverization levels for non-freezing and freezing conditions were taken from a previous laboratory study.Frost effects were considered in pavement design using two different approaches,including limited subgrade frost penetration method and reduced subgrade strength method.Detailed application and evaluation were performed for all steps.Lime stabilized subgrades significantly reduced the thickness of base courses,and the benefit of lime stabilization was highly dependent on soil pulverization level.A detailed cost analysis on the unstabilized and stabilized cases found that the use of lime stabilization in the subgrade provided significant initial cost savings.Comparative analysis by using the AASHTO(1993)method and KENPAVE software,and quantity effect of soil pulverization level on the performance of low volume roads from a service life perspective,show that subgrade resilient modulus can be estimated.It is also possible to make correct performance estimation in the field.The results of the study show that lime stabilization is a good solution for low volume roads in the mountainous regions of Türkiye. 展开更多
关键词 Aggregate surfaced roads Lime Stabilization Soil Pulverization Levels road Design Service Life Cost analyses
下载PDF
上面层改性沥青混合料低温性能综合对比评价 被引量:1
16
作者 查旭东 谭仕杰 +1 位作者 邹博 王旭东 《长沙理工大学学报(自然科学版)》 CAS 2024年第1期30-38,共9页
【目的】分析足尺路面试验环道所用7种上面层细粒式改性沥青混合料的低温性能。【方法】通过小梁低温弯曲、中梁线收缩系数和法国M2F梯形梁动态模量3种室内试验开展研究及相关性分析,并应用多指标试验结果的无量纲归一化赋权求和法进行... 【目的】分析足尺路面试验环道所用7种上面层细粒式改性沥青混合料的低温性能。【方法】通过小梁低温弯曲、中梁线收缩系数和法国M2F梯形梁动态模量3种室内试验开展研究及相关性分析,并应用多指标试验结果的无量纲归一化赋权求和法进行综合对比评价。【结果】最大弯拉应变、应变能密度、线收缩系数、复模量和相位角均可作为改性沥青混合料低温性能的合理评价指标;对比改性沥青类型,采用低温延性强的SBS改性沥青制备的混合料低温性能最优,橡胶沥青混合料的次之,掺抗车辙剂能增强SBS改性AC类混合料的低温性能;对比矿料合成级配,SMA类的低温性能最优,SBS改性AC类中粗集料含量越低,其低温性能越好;多孔排水式高黏SBS改性PAC类具有优良的黏弹性和低温收缩性能。【结论】评价结果可为环道沥青路面低温性能长期监测对比提供参考。 展开更多
关键词 道路工程 上面层 改性沥青混合料 低温性能 评价指标
下载PDF
基于数值模拟的高速公路S型曲线积水规律分析
17
作者 吴文亮 曾威凯 +1 位作者 李智 王晓飞 《华南理工大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第8期56-64,共9页
S型曲线由于特殊的线型几何特征形成了易积水的路面区域,对于积水规律的掌握有利于在设计和建造阶段提前预防和处理积水路段的危害。该文基于计算流体力学软件Fluent,结合计算流体力学分析中基于欧拉-拉格朗日方法的欧拉液膜模型EWF(Eul... S型曲线由于特殊的线型几何特征形成了易积水的路面区域,对于积水规律的掌握有利于在设计和建造阶段提前预防和处理积水路段的危害。该文基于计算流体力学软件Fluent,结合计算流体力学分析中基于欧拉-拉格朗日方法的欧拉液膜模型EWF(Eulerian Wall Film),针对精细化处理的典型S型曲线双向多车道道路模型进行模拟计算。模拟包含了几何特征与降雨量等不同变量因素,得出了积水的水膜厚度以及流速分布规律。模拟结果表明:在降雨阶段,S型曲线横坡坡度0%~1%路段为积水路段,横坡坡度1%~2%路段为易积水路段,横坡坡度大于2%的路段积水情况受到降雨强度影响;在排水阶段,S型曲线横坡坡度0%~1%路段为排水困难路段,横坡坡度1%~2%路段为排水不畅路段,横坡坡度大于2%的路段排水顺畅,在排水时间结束时,路面在不同的几何条件和降雨条件下均能将积水排除至水膜厚度小于2 cm,横坡的大小与渐变影响了积水的横向分布与纵向分布,横向呈现中间高两边低、横断面上标高大的位置水膜厚度小和标高小的位置水膜厚度大的水膜厚度分布规律,总体呈现S型的分布规律;水膜流速在积水阶段呈现纵向上中间低两边高、水膜厚度大则水膜流速大的水膜厚度分布规律,在排水阶段则为纵向上中间高两边低的水膜流速分布规律。道路宽度影响了降雨落到路面的积水总量,进而对积水水膜厚度产生了影响;超高缓和率则主要使得积水路段、易积水路段增长,从而影响了积水分布的范围。 展开更多
关键词 计算流体力学 S型曲线 路面积水 积水规律
下载PDF
抢险车对92m跨度复合材料桁架桥动态响应的影响
18
作者 孙泽阳 刘阳 +2 位作者 杨俊锋 吴必涛 赵启林 《江苏大学学报(自然科学版)》 CAS 北大核心 2024年第3期346-353,共8页
为研究大跨径桁架式纤维增强复合材料(FRP)应急抢修桥梁成桥后的动力性能,基于导梁推送施工92 m跨度的FRP桁架桥模型,编制FRP桁架桥的车桥耦合算法,研究抢险车辆的车速、质量及路面不平顺对FRP桁架桥的跨中竖向位移、竖向加速度和关键... 为研究大跨径桁架式纤维增强复合材料(FRP)应急抢修桥梁成桥后的动力性能,基于导梁推送施工92 m跨度的FRP桁架桥模型,编制FRP桁架桥的车桥耦合算法,研究抢险车辆的车速、质量及路面不平顺对FRP桁架桥的跨中竖向位移、竖向加速度和关键杆件轴向应力等指标的影响.结果表明:路面越不平顺,车辆对桥梁结构的冲击作用越大,且路面等级对竖向位移的影响大于对关键杆件轴向应力的影响;车速为20~50 km/h时,车速变化对冲击系数影响较小,但车速超过50 km/h时,车速的影响逐渐增大;车辆质量对桥梁各项指标动力响应的峰值曲线呈线性增大趋势.当车辆质量为2.80×10^(4)kg,车速30 km/h时,最大跨中竖向位移为167 mm,未超过抢修桥梁位移限值(L/120),表明该桥梁的设计可以满足抢险的通行要求. 展开更多
关键词 纤维增强复合材料桁架桥 车桥耦合 位移接触法 动态响应 路面不平顺
下载PDF
北方寒冷地区温度场作用下公路路表形变规律分析
19
作者 纪伦 张红菊 +3 位作者 郭宏斌 邹勇 赵振国 谭忆秋 《哈尔滨工业大学学报》 EI CAS CSCD 北大核心 2024年第9期113-123,共11页
为了更加具体、深入地理解寒区道路,研究其病害发生、发展规律,提高对道路结构在时间和空间上的认知,开展了北方寒冷地区路表形变规律的研究。通过选取典型公路路段,建立10个监测段落,对路基的冻胀、融沉变形持续进行现场高程监测。分... 为了更加具体、深入地理解寒区道路,研究其病害发生、发展规律,提高对道路结构在时间和空间上的认知,开展了北方寒冷地区路表形变规律的研究。通过选取典型公路路段,建立10个监测段落,对路基的冻胀、融沉变形持续进行现场高程监测。分析温度场作用下路表形变特征和响应机制,分析公路在自然条件下的时域形变特点、动态形变特征及差异性。分析周期监测数据,构建竖向相对形变、竖向相对形变速率、横断面间形变速率最大倍数等参数,比较不同段落、不同横断面和监测点间的形变及其差异。研究北方寒冷地区路表形变与温度场协调规律,结果表明:北方寒冷地区基于温度场的路表形变具有典型的周期特性。对比分析填、挖方路段纵横方向形变的差异特征,形变极值分布规律,以及结合热胀、冻胀、融沉阶段的相对形变规律及形变速率差异特点,结果发现:挖方路段形变速率是填方路段的10余倍;8月份至10月份的热胀速率大于10月份至11月份的热胀速率;融沉主要发生在3月份至5月份;而冻胀速率较为稳定,对于填方路段,11月份至次年1月份的冻胀大于1月份至2月份的冻胀,而挖方路段则相反。给出了寒冷地区路表形变的温度场时域响应规律、特点,为开展寒区路基、路面结构和材料研究,以及道路病害等研究提供了依据。 展开更多
关键词 北方寒冷地区 路表形变 路基 冻胀 融沉 形变规律
下载PDF
风流扰动下露天矿土质路面粉尘运移规律研究
20
作者 王来贵 王逸腾 赵娜 《中国安全生产科学技术》 CAS CSCD 北大核心 2024年第7期121-129,共9页
为降低露天矿土质路面粉尘质量浓度,提高清洁生产水平,采用气固两相流理论,建立粉尘颗粒起动模型,分析粉尘起动风速及变化规律,利用实验研究进行验证,并确立粉尘运移规律以及运动形式,选取正交实验极差分析各因素对起尘量影响显著性。... 为降低露天矿土质路面粉尘质量浓度,提高清洁生产水平,采用气固两相流理论,建立粉尘颗粒起动模型,分析粉尘起动风速及变化规律,利用实验研究进行验证,并确立粉尘运移规律以及运动形式,选取正交实验极差分析各因素对起尘量影响显著性。研究结果表明:粉尘起动风速与粉尘粒径、含水率、负荷均有函数关系;起尘量在粒径、含水率、负荷、风速4种因素下呈现不同变化规律,与粒径、风速均呈非线性关系,与含水率呈负相关,与粉尘负荷呈正相关,影响显著性为:粒径>负荷>风速>含水率;粉尘运动形式与风速和粒径相关,在5 m/s风速下,(0,75]μm粒径粉尘易做悬浮运动,(75,500]μm粒径粉尘易做跳跃运动,(500,1000]μm粒径粉尘易做蠕移运动。研究结果可为降尘措施提供理论指导。 展开更多
关键词 露天矿 土质路面 起动风速 起尘量 运动方式
下载PDF
上一页 1 2 103 下一页 到第
使用帮助 返回顶部