Romanian Journal of Transport Infrastructure最新文献_第7页

Preliminary Studies to Use Textile Fibers Obtained from Recycled Tires to Reinforce Asphalt Mixtures 利用再生轮胎纺织纤维增强沥青混合料的初步研究

IF 0.1

Romanian Journal of Transport Infrastructure Pub Date : 2018-12-01 DOI: 10.2478/rjti-2018-0009

J. Pais, A. Ferreira, Caio R. Santos, P. Pereira, D. Presti

{"title":"Preliminary Studies to Use Textile Fibers Obtained from Recycled Tires to Reinforce Asphalt Mixtures","authors":"J. Pais, A. Ferreira, Caio R. Santos, P. Pereira, D. Presti","doi":"10.2478/rjti-2018-0009","DOIUrl":"https://doi.org/10.2478/rjti-2018-0009","url":null,"abstract":"Abstract The use of crumb rubber in the modification of asphalt has occurred because of the problems related to disposal of scrap tires. However, the use of scrap tires in asphalt pavements, known as asphalt rubber pavements, can minimize environmental impacts and maximize conservation of natural resources. The textile fibers from recycled tires are typically disposed of in landfills or used in energetic valorization, but similar to other fibers, they can be used as a valuable resource in the reinforcement of engineering materials such as asphalt mixtures. Thus, this work aims at studying the use of textile fibers recycled from ground tires in the reinforcement of conventional asphalt mixtures. The application of textile fibers from ground tires was evaluated through laboratory tests on specimens extracted from slabs produced in the laboratory. Indirect tensile tests were performed on a series of nine asphalt mixtures with different fiber and asphalt contents and compared with a conventional mixture. The results obtained from a 50/70 pen asphalt were used to define three asphalt mixture configurations to be used with 35/50 pen asphalt. The results indicate that the textile fibers recycled from used tires can be a valuable resource in the reinforcement of asphalt mixtures.","PeriodicalId":40630,"journal":{"name":"Romanian Journal of Transport Infrastructure","volume":"7 1","pages":"14 - 30"},"PeriodicalIF":0.1,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42881856","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

Simultaneous Influence of the Track Axis Curvature and the Support Line Obliquity at Railway Bridge Superstructures with Steel Beams Embedded in Concrete 轨道轴线曲率和支撑线倾角对混凝土预埋钢梁铁路桥梁上部结构的同时影响

IF 0.1

Romanian Journal of Transport Infrastructure Pub Date : 2018-12-01 DOI: 10.2478/rjti-2018-0013

Stănescu Răzvan Marian, Stan Oana Mihaela

引用次数: 0

Testing the Functionality and Performance of a Rail Damper 轨道减振器的功能和性能测试

IF 0.1

Romanian Journal of Transport Infrastructure Pub Date : 2018-12-01 DOI: 10.2478/rjti-2018-0010

T. Mazilu, I. Răcănel, George Stoicescu

引用次数: 0

Modal Competition and Complementarity: Cost Optimization at End-User Level 模式竞争与互补性:终端用户层面的成本优化

IF 0.1

Romanian Journal of Transport Infrastructure Pub Date : 2018-12-01 DOI: 10.2478/rjti-2018-0012

D. Costescu

{"title":"Modal Competition and Complementarity: Cost Optimization at End-User Level","authors":"D. Costescu","doi":"10.2478/rjti-2018-0012","DOIUrl":"https://doi.org/10.2478/rjti-2018-0012","url":null,"abstract":"Abstract The paper aims to identify possible methods for balancing the allocation of transport flow on modal subsystems in order to efficiently use the infrastructures and reduce the negative effects of today’s unbalance. The aspects of intermodal competition are reviewed, considering the economic concepts regarding the substitutability of transportation services, conformation degree to the perfect competition model and the nature of cross elasticity demand. A top-down analysis over the whole infrastructure assembly is performed. The results, under the presumption of valid work hypothesis, indicated that for further analysis the set of networks transferring material flows can be assumed as disconnected from the other networks sets transferring energy, informational and values flows. The second part of the paper develops, for that disconnected networks, a generalized cost optimization model for multimodal transportation, where the comfort and safety are accounted. Thus, the performance of the existing algorithms based only on trip length, trip duration and energy consumption can be significantly improved. Additionally, the author proposes three new independent types of modal analysis that allow end-users and companies involved in transport organization to optimize their modal choice and the whole transport process organization.","PeriodicalId":40630,"journal":{"name":"Romanian Journal of Transport Infrastructure","volume":"7 1","pages":"61 - 76"},"PeriodicalIF":0.1,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45674998","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

Pedestrianism as an Effective Tool for Sustainable Intra-City Commuting in Calabar, Southern Nigeria 行人专用是尼日利亚南部卡拉巴尔市可持续市内通勤的有效工具

IF 0.1

Romanian Journal of Transport Infrastructure Pub Date : 2018-07-01 DOI: 10.2478/rjti-2018-0001

I. Okon

{"title":"Pedestrianism as an Effective Tool for Sustainable Intra-City Commuting in Calabar, Southern Nigeria","authors":"I. Okon","doi":"10.2478/rjti-2018-0001","DOIUrl":"https://doi.org/10.2478/rjti-2018-0001","url":null,"abstract":"Abstract The promotion of walking has become a global strategy in sustainable urban transportation planning. This is with the aim of reducing the urban commuter’s problems that result from the dominance of motorized urban transit, especially in developing countries with an increasing rate of urbanization. This study is carried out in Calabar, Southern Nigeria with the aim of assessing the conditions under which pedestrianism is enhanced. Research questionnaires were administered to household heads in all 22 localities with political delineation (wards) in the city. Respondents were sampled using the stratified sampling technique where every 10th residential house is sampled after the initial listing of houses. Logistic regression analysis was conducted to predict the conditions under which about 382 household heads (about 98% respondent rate) in Calabar could undertake utilitarian walking using factors such as motorized traffic, weather conditions, lack of safety of pedestrians and socio-economic variables as category predictors. A test of the full model against a constant single model was statistically significant, indicating that the predictors, as a set, reliably distinguished utilitarian walking and non-walking (chi square = 60.544, p < .001 with df = 17). Nagelkerke’s R2 of .232 indicated a moderately strong relationship between prediction and grouping. Prediction success overall was 70.5% (53.5% for non-walking, and 81.5% for walking). The Wald criterion demonstrated that only pedestrian conflict, lack of safety of pedestrian and the age of the pedestrian made a significant contribution to the prediction in model 1 (p = .000). Furthermore, about 99.2% of pedestrians indicated walking distances of not more than 5km while on the other hand, they can afford 0.8km to bus station, 3km to school, 5km for shopping, and about 20km for recreation trips. The study recommended counseling strategies for promoting pedestrianism among which is the development of pedestrian walkways and complementary facilities to enhance pedestrian safety and comfort.","PeriodicalId":40630,"journal":{"name":"Romanian Journal of Transport Infrastructure","volume":"7 1","pages":"1 - 17"},"PeriodicalIF":0.1,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41525142","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: 2

Rationale of Complex Indicator of Quality of Public Transport 复杂公共交通质量指标的基本原理

IF 0.1

Romanian Journal of Transport Infrastructure Pub Date : 2018-07-01 DOI: 10.2478/rjti-2018-0002

Davidich Natalia, Halina Faletska, G. Andrii, Melenchuk Tatyana, Chumachenko Igor, D. Yurii

引用次数: 3

Role of CPEC in Development of Trade, Transport and Economy of Pakistan CPEC在巴基斯坦贸易、运输和经济发展中的作用

IF 0.1

Romanian Journal of Transport Infrastructure Pub Date : 2018-07-01 DOI: 10.2478/rjti-2018-0005

A. Rehman, A. Hakim, K. Khan, I. Khan

{"title":"Role of CPEC in Development of Trade, Transport and Economy of Pakistan","authors":"A. Rehman, A. Hakim, K. Khan, I. Khan","doi":"10.2478/rjti-2018-0005","DOIUrl":"https://doi.org/10.2478/rjti-2018-0005","url":null,"abstract":"Abstract The objectives of the study were to measure the efficiency in trade and transport through China Pakistan Economic Corridor (CPEC) and to ascertain efficiency in trade and economic development through developed transport infrastructures. The present study was conducted in Peshawar, Pakistan. The data was collected from the relevant developing sectors and stakeholders through CPEC including investors of Khyber Pakhtunkhwa Chamber of Commerce and Peshawar Railway Station track employees. Majority of bi-variate analysis through chi-square test result showed that there was a strong and significant association between the project of CPEC and efficiency in trade and transport in terms of economy. Similarly, a strong and significant association was found between the development of transport routes through CPEC and smooth transportation of goods and services. Furthermore, a strong and significant association was found between CPEC project and improvement in travelling potential. Similarly, a significant association was found between development in transport infrastructure and fastness and reliability in business travelling. In the same way, a significant association was found between CPEC and increase in the geographical size of the labour market. As in the chain, a strong and significant association was found between the development of transport infrastructures through CPEC and increase in labour force productivity along with an increase in the range of choice of individual and firms. This could come true that CPEC as a project would ensure smooth efficiency transportation of trade goods and services in terms of reducing time distance and cost. CPEC as a project should not be only limited to economic activities, rather it should contribute to the overall socio-economic development of the region.","PeriodicalId":40630,"journal":{"name":"Romanian Journal of Transport Infrastructure","volume":"7 1","pages":"77 - 92"},"PeriodicalIF":0.1,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42295240","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: 23

Study on Indirect Tensile Strength of Plastic Waste Bituminous Concrete for Road Construction 道路工程用塑料废沥青混凝土的间接抗拉强度研究

IF 0.1

Romanian Journal of Transport Infrastructure Pub Date : 2018-07-01 DOI: 10.2478/rjti-2018-0006

Anurag V. Tiwari, Y. Rao

引用次数: 3

Optimization of the Synergies Between Preparation of High-Speed Railway Train Running Diagram and Station Route Allocation Plan 高速铁路列车运行图编制与车站线路配置方案协同优化

IF 0.1

Romanian Journal of Transport Infrastructure Pub Date : 2018-07-01 DOI: 10.2478/rjti-2018-0003

Alhossein Mohamed, Peng Qiyuan, Malik Muneeb Abid

{"title":"Optimization of the Synergies Between Preparation of High-Speed Railway Train Running Diagram and Station Route Allocation Plan","authors":"Alhossein Mohamed, Peng Qiyuan, Malik Muneeb Abid","doi":"10.2478/rjti-2018-0003","DOIUrl":"https://doi.org/10.2478/rjti-2018-0003","url":null,"abstract":"Abstract Introduction. Station route allocation plan is an important extension of the train running diagram and the both are closely intertwined so the overall research on the synergetic preparation method is more beneficial in improving the preparation quality of the train running diagram and providing better service for passengers. Therefore, the research topic has practical significance. Methodology. Based on extensive literatures, this paper studies the synergetic preparation method of train running diagram and station route allocation plan in detail and analyses their association for providing a theoretical basis for the synergetic preparation method. Results. This work introduces the synergetic, analyses the systematic characteristics of the operation organization system of high speed railway and puts forward the optimization strategy of train running diagram and station route allocation plan. Conclusions. The work provides the solution for the preparation of the train running diagram and station route allocation plan by solving the examples based on the relevant optimization factors, such as train running in districts and train arrangement.","PeriodicalId":40630,"journal":{"name":"Romanian Journal of Transport Infrastructure","volume":"7 1","pages":"34 - 63"},"PeriodicalIF":0.1,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43292508","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

Steel and Concrete Elasto-Plastic Models at Bridges with Steel Beams Embedded in Concrete 混凝土中埋有钢梁的桥梁的钢和混凝土弹塑性模型

IF 0.1

Romanian Journal of Transport Infrastructure Pub Date : 2018-07-01 DOI: 10.2478/rjti-2018-0004

Stănescu Răzvan Marian

{"title":"Steel and Concrete Elasto-Plastic Models at Bridges with Steel Beams Embedded in Concrete","authors":"Stănescu Răzvan Marian","doi":"10.2478/rjti-2018-0004","DOIUrl":"https://doi.org/10.2478/rjti-2018-0004","url":null,"abstract":"Abstract For new railway bridges with short spans (L ≤ 35.00 m) superstructures with steel beams embedded in concrete are recommended or used, which can ensure the requirements of strength and stiffness in particular, regardless of velocity. They are built relatively easily compared to reinforced concrete structures or steel structures, they have high durability if designed, built and maintained correctly and don’t have high sensitivity to fatigue degradation in service. They are also used for road bridges when it is desired to achieve a reduced construction height. In all the design prescriptions used so far for structures with steel beams embedded in concrete, the calculation is a simplified one, made on a single insulated longitudinal beam of the deck, if certain conditions related to the geometry of the structure are met (obliquity, curvature). Simplifications are also made regarding the state of deformation of the decks made in this constructive solution by introducing an effective moment of inertia in the displacement calculation, as an average of the inertia moments of the cross section considered to be cracked and respectively un-cracked. The article aims to validate steel and concrete elasto-plastic models, based on an experiment from the technical literature, necessary for complex analyses of the percentage of concrete involved in the stiffness of the cross-sections, in case of bridges with steel beams embedded in concrete.","PeriodicalId":40630,"journal":{"name":"Romanian Journal of Transport Infrastructure","volume":"7 1","pages":"64 - 76"},"PeriodicalIF":0.1,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42817772","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