Journal of Highway and Transportation Research and Development最新文献_第10页

Net Distance between an Urban Road Grade Crossing and a Tunnel 城市道路平交道口与隧道之间的净距离

Journal of Highway and Transportation Research and Development Pub Date : 2017-12-01 DOI: 10.1061/jhtrcq.0000599

Chi Zhang

引用次数: 0

Coupling Coordination Measurement between Information Attention and Service Level of Urban Public Transport 城市公共交通信息关注与服务水平的耦合协调测度

Journal of Highway and Transportation Research and Development Pub Date : 2017-12-01 DOI: 10.1061/JHTRCQ.0000602

Jing-jing Hao, Xiaofeng Ji, Ting-ting Xun

引用次数: 0

Green Wave Coordinate Control Method for Arterial Traffic Based on Traffic Wave Theory 基于交通波理论的干线交通绿波协调控制方法

Journal of Highway and Transportation Research and Development Pub Date : 2017-12-01 DOI: 10.1061/JHTRCQ.0000597

Da-Yi Qu, Meng-fei Wan, Zi-lin Wang, Xiang-hua Xu, Jin-zhan Wang

{"title":"Green Wave Coordinate Control Method for Arterial Traffic Based on Traffic Wave Theory","authors":"Da-Yi Qu, Meng-fei Wan, Zi-lin Wang, Xiang-hua Xu, Jin-zhan Wang","doi":"10.1061/JHTRCQ.0000597","DOIUrl":"https://doi.org/10.1061/JHTRCQ.0000597","url":null,"abstract":"To achieve green wave traffic and improve the operational efficiency of arterial traffic, this study considers the relevance of intersections and optimizes four trunk optimal control parameters, namely, signal cycle, phase sequence, split, and offset from the perspective of coordination. On the basis of traffic wave theory, vehicle queuing is explained, and the internal mechanism of green wave traffic in a large flow by-wire system is determined. An offset optimization model is established to avoid the queuing of vehicles at the downstream intersection. We select 13 intersections along Coastal Road in Qingdao City as the research object and then use optimization schemes to verify the feasibility of the arterial coordinated control optimization method and the practicability of the established model. Results indicate that cycle, phase sequence, split, and offset are important indicators of arterial coordination optimization control. Moreover, remarkable results are obtained with the optimization of the intersection offset optimization model based on traffic wave theory for the optimization of total travel time and the number of stopping vehicles.","PeriodicalId":288169,"journal":{"name":"Journal of Highway and Transportation Research and Development","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129761339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Properties of Polyurethane-modified Asphalt Based on Castor Oil 蓖麻油改性聚氨酯沥青的性能研究

Journal of Highway and Transportation Research and Development Pub Date : 2017-12-01 DOI: 10.1061/JHTRCQ.0000591

Xianling Lei, Haiyan Zhang, D. Cao, Yan-sheng Guo

{"title":"Properties of Polyurethane-modified Asphalt Based on Castor Oil","authors":"Xianling Lei, Haiyan Zhang, D. Cao, Yan-sheng Guo","doi":"10.1061/JHTRCQ.0000591","DOIUrl":"https://doi.org/10.1061/JHTRCQ.0000591","url":null,"abstract":"To develop a new type of modified asphalt, castor oil-contained asphalt is obtained with green renewable castor oil instead of petroleum-based polyols. The second monomer-liquefied methylene diphenyl diisocyanate (MDI) is gradually added to a pitch system with shearing, and castor oil-based polyurethane (PU)-modified asphalt is prepared. The dosages of castor oil and second monomer MDI are calculated with isocyanate index R (—NCO/—OH)=1.8, and the modified asphalt with 10%-30% content of castor oil-based PU is synthesized. The performance of the modified asphalt is characterized through a conventional experiment. Experiment results show that the modifier in the asphalt is dispersed evenly, and the high-and low-temperature performance of the castor oil-based PU-modified asphalt is improved. The high-temperature grade of the asphalt is determined by performing the original grade test and thin film oven test on samples. On the basis of the high-temperature grade, the high-temperature performance of different asphalt samples after aging is analyzed and evaluated via a multiple stress creep recovery test. Test results show that the creep compliance of the modified asphalt is reduced significantly, and the recovery rate is increased compared with that of base asphalt. Increased elasticity and stiffening are achieved. With the increase in modifier dosage, creep compliance declines and the recovery rate increases simultaneously. The modification effect is also improved.","PeriodicalId":288169,"journal":{"name":"Journal of Highway and Transportation Research and Development","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127407083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Experimental Study on Determining Design Parameters of Non-Prestressed BFRP Anchor for Supporting Soil Slope 土质边坡非预应力BFRP锚杆设计参数确定试验研究

Journal of Highway and Transportation Research and Development Pub Date : 2017-12-01 DOI: 10.1061/JHTRCQ.0000593

Zhu Lei, Jingu Kang, W. Zhao, Q. Xie, Xian-jian Gao

{"title":"Experimental Study on Determining Design Parameters of Non-Prestressed BFRP Anchor for Supporting Soil Slope","authors":"Zhu Lei, Jingu Kang, W. Zhao, Q. Xie, Xian-jian Gao","doi":"10.1061/JHTRCQ.0000593","DOIUrl":"https://doi.org/10.1061/JHTRCQ.0000593","url":null,"abstract":"Basalt fiber-reinforced polymer (BFRP) is a high-strength, lightweight material with an anti-corrosion property and a thermal expansion coefficient that is close to that of concrete. When used as an anchor bolt material, the corrosion problem of steel anchors can be solved fundamentally. In recent years, the BFRP bar has been applied in geotechnical anchorage engineering. In this study, the mechanical properties of the BFRP bar were studied by tensile, shear, corrosion resistance, and bonding strength tests with cement-based materials. In accordance with the design specifications of the steel anchor and existing research results, the design parameters of the non-prestressed BFRP anchor in supporting soil slope were proposed. To examine the reinforcing effect of the BFRP anchor, this study adopted the recommended parameters to design a BFRP anchor in an actual soil slope. A field contrast test of the steel anchor was also carried out. Experimental studies yielded the following conclusions. First, the tensile-strength safety factor of the non-prestressed BFRP bar should not be less than 1.6 (permanent) and 1.4 (temporary). The tensile-strength standard value was 80% of the ultimate tensile strength, and the value of the BFRP bar (diameter ≥ 12 mm) commonly used as an anchor was 710 MPa. The bonding-strength standard value between the BFRP bar and cement was equal to the average value divided by 2.1 of the pull-out test, and the common value was 2.8 MPa. The monitoring field test data proved that the designed BFRP anchor demonstrates better control displacement and can effectively retain soil slope. Moreover, the reinforcing effect of the BFRP anchor was equivalent to that of the steel anchor. Thus, the design of the BFRP anchor is reasonable, and the equal strength substitution method can be used to design the BFRP anchor.","PeriodicalId":288169,"journal":{"name":"Journal of Highway and Transportation Research and Development","volume":"1999 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128256551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Study on the Critical Height of Secondary Salinization of Silty Soil Subgrade in the Yellow River Impact Plain Area 黄河影响平原粉质土路基次生盐渍化临界高度研究

Journal of Highway and Transportation Research and Development Pub Date : 2017-12-01 DOI: 10.1061/JHTRCQ.0000594

Z. Yao, Jun Yu, Zhongxiang Liu, Shuo Zhang

{"title":"Study on the Critical Height of Secondary Salinization of Silty Soil Subgrade in the Yellow River Impact Plain Area","authors":"Z. Yao, Jun Yu, Zhongxiang Liu, Shuo Zhang","doi":"10.1061/JHTRCQ.0000594","DOIUrl":"https://doi.org/10.1061/JHTRCQ.0000594","url":null,"abstract":"To study the critical height of secondary salinization of silty soil subgrade, this paper examines the salt migration law in the secondary salinization of the non-saline soil subgrade in the Yellow River impact plain area via laboratory and numerical analyses using COMSOL Multiphysics. The results show that (1) if the top of subgrade has not yet formed poly salt, then the internal roadbed will also not form poly salt. and it shows the trend of gradually decreasing from the bottom to the salt distribution in the subgrade; (2) the relationship among the weak internal saline soil formation of critical height, the groundwater mineralization degree, and the underground water level at the top of the subgrade can be used to establish an approximate correlation and regression formula for the Yellow River impact plain area for estimating the weak internal saline soil formation of critical height; and (3) the influence of the groundwater mineralization degree on the secondary salinization of silty soil subgrade in the Yellow River impact plain area is significantly higher than those of the buried depth of groundwater and the filling height of subgrade.","PeriodicalId":288169,"journal":{"name":"Journal of Highway and Transportation Research and Development","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127747257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Overspeeding on the Lateral Stability of a Bus Running on a Curve 超速对弯道上公共汽车横向稳定性的影响

Journal of Highway and Transportation Research and Development Pub Date : 2017-09-01 DOI: 10.1061/JHTRCQ.0000584

Chu-na Wu, Cheng Zeng, Yi-ying Wang

引用次数: 0

Experimental Study on the Influence of Temperature on Salt Expansion of Sodium Sulfate Saline Soil 温度对硫酸钠盐渍土盐膨胀影响的实验研究

Journal of Highway and Transportation Research and Development Pub Date : 2017-09-01 DOI: 10.1061/JHTRCQ.0000574

Xusheng Wan, Mengke Liao, L. Du

{"title":"Experimental Study on the Influence of Temperature on Salt Expansion of Sodium Sulfate Saline Soil","authors":"Xusheng Wan, Mengke Liao, L. Du","doi":"10.1061/JHTRCQ.0000574","DOIUrl":"https://doi.org/10.1061/JHTRCQ.0000574","url":null,"abstract":"To find the rule on the effect of different temperatures on salt expansion of sodium sulfate saline soil and ensure the safety of road engineering in areas with sulfate saline soil, we tested saline soil samples in a laboratory. By analyzing the variation in soil samples before and after cooling and the variation in water content under different temperatures, we determined the influence of salt expansion on soil components under different temperatures by using computed tomography. Results show that salt expansion intensifies and tends to stabilize under decreasing temperature. Salt expands mainly from 0℃ to the initial precipitation temperature of salt crystals, and very slight precipitation occurs at a negative temperature; thus, salt expansion is very low at temperatures below 0℃. Moisture content decreases as temperature decreases, and the diminishing trend decreases and gradually stabilizes at 0℃. Damage in soil structure increases as temperature decreases. Change in porosity occupied by air is mainly determined by change in water content. Porosity changes acutely with acute changes in water content, and these parameters show an inverse relationship.","PeriodicalId":288169,"journal":{"name":"Journal of Highway and Transportation Research and Development","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130355719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Probabilistic Modeling of Fatigue Damage in Orthotropic Steel Bridge Decks under Stochastic Traffic Loadings 随机交通荷载作用下正交异性钢桥面疲劳损伤的概率建模

Journal of Highway and Transportation Research and Development Pub Date : 2017-09-01 DOI: 10.1061/JHTRCQ.0000582

Yuanhui Luo, D. Yan, M. Yuan, Naiwei Lu

{"title":"Probabilistic Modeling of Fatigue Damage in Orthotropic Steel Bridge Decks under Stochastic Traffic Loadings","authors":"Yuanhui Luo, D. Yan, M. Yuan, Naiwei Lu","doi":"10.1061/JHTRCQ.0000582","DOIUrl":"https://doi.org/10.1061/JHTRCQ.0000582","url":null,"abstract":"Fatigue truck models with deterministic parameters were developed int a stochastic vehicle flow model. A response surface method was used to approximate the function between vehicle axle weight and equivalent fatigue stresses with few training data to solve the time-consuming problem of bridge finite element analysis under traffic flow loads. A probabilistic fatigue damage modeling method was presented and applied to the rib-to-deck details of steel box girder bridges. Finally, the fatigue damage model was applied to the reliability assessment of steel box girder bridges, and influences of traffic flow parameters on structural fatigue reliability were studied. Numerical results indicate that the higher occupancy rate of heavy vehicle flow in a slow lane than in a fast lane mainly explains the decrease in the fatigue reliability of corresponding rib-to-deck details. The increase in vehicle axle weight causes a rapid decrease in the fatigue reliability index of steel box girders. The fatigue reliability index of rib-to-deck detail in the slow lane decreases from 3.42 to 0.72 when the annual linear growth factor ranges from 0 to 1%. The stochastic fatigue vehicle flow model and the probabilistic model for fatigue damage exhibit considerable potential in the probability assessment of bridge fatigue damage.","PeriodicalId":288169,"journal":{"name":"Journal of Highway and Transportation Research and Development","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125523178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Study on the Layout of Intercity Rail Transit Network Based on Traffic Location 基于交通区位的城际轨道交通网络布局研究

Journal of Highway and Transportation Research and Development Pub Date : 2017-09-01 DOI: 10.1061/JHTRCQ.0000585

Jianmei Tan, Jincheng Liu, Yunhui Xu

引用次数: 0