Tarrahan Parseh Transportation Research InstituteInternational Journal of Transportation Engineering2322-259X4420170401Assessment and Prioritizing the Risks of Urban Rail Transportation by Using Grey Analytical Hierarchy Process (GAHP)2552734443010.22119/ijte.2017.44430ENVahidBaradaranAssistant Professor, Department of Industrial Engineering, Islamic Azad University, Tehran North Branch, Tehran, Iran0000-0001-5385-629XJournal Article20160118Some incidents in urban railway systems affect the function of the subway’s company adversely and they could disorder the services. These events may inflict irreparable damage to passengers, employees and equipment. By recognizing the hazards existing in this type of transportation system and evaluating and prioritizing risks, we can perform appropriate actions to reduce the probability and severity of them. In this paper, thirteen risks of rail transport system in Tehran subway have been identified and nine evaluation criteria and sub criteria are specified. Analytical Hierarchy Process (AHP) approach based on the grey number scores (GAHP) has been developed in terms of complete uncertainty and incomplete information and risks are prioritized based on subway system expert’s opinion. The use of grey or interval numbers in AHP, in addition to more accurate assessment beside crisp numbers has lower computational complexity than fuzzy numbers. To calculate local and global weights for pairwise comparison matrices, a non linear and two linear optimization models are used. Injuring the passengers because of closing the doors of train is the important risk in Tehran subway system.http://www.ijte.ir/article_44430_1f28d360535447614187c6451a16d367.pdfTarrahan Parseh Transportation Research InstituteInternational Journal of Transportation Engineering2322-259X4420170401An Investigation and Comparison of Road Transport Indicators among the Provinces of Iran2752864443110.22119/ijte.2017.44431ENAliKhaksari RafsanjaniProfessor, Department of Urban and Regional Planning, Allameh Tabataba'i University (ATU), Tehran, Iran.AminAsadi SisakhtMSc Student, Department of Urban and Regional Planning, Allameh Tabataba'i University (ATU), Tehran, Iran.Journal Article20160625One of the major obstacles in the process of national development, is the disruption in regional balance construct. As has been noted in some studies the existence of regional inequity leads to domination of some regions to surrounding regions and causing political and economic challenges in developing countries. And given that transportation is one of the components of region, undoubtedly equity in transportation infrastructure and quality services both for passenger and freight is one of the factors affecting the balance construct between regions.Socio-economic impacts of transportation are amongst the most important issues in transportation planning and appropriate transportation planning is the key to sound regional development. One of the major planning issues is the transportation equity. Inequity of transportation, itself leads to many other inequities and it is highly essential to consider that in the plans and policies regarding transportation in the country. The main purpose of the present paper is to investigate and make a comparison of road transportation indicators among the provinces of Iran. For this purpose, the relative level of transportation development in different provinces was determined using taxonomy method. Nine indicators provided by Road Maintenance and Transportation Organization were used to carry out analyses. The data were analyzed and described by utilizing from SPSS and GIS Soft wares. The outcomes indicate relative favorable development status in the region consisted of Tehran, Alborz and Qom provinces and unfavorable development of transportation status, especially in the Southeast region. In fact it was revealed that vertical equity in the distribution of infrastructure and services among provinces of Iran is not considered enough. This may be the result of horizontal equity or internal and external factors affecting the performance of the provinces or both.http://www.ijte.ir/article_44431_09e7bb8e71d5cf0750cf485e9929a50e.pdfTarrahan Parseh Transportation Research InstituteInternational Journal of Transportation Engineering2322-259X4420170401A Two-Phase Hybrid Heuristic Method for a Multi-Depot Inventory-Routing Problem2873044443210.22119/ijte.2017.44432ENAmirSaeedNikkhah QamsariMSc. Student, School of Industrial Engineering, Iran University of Science and Technology, Tehran, IranSeyed MahdiHosseini MotlaghAssistant Professor, School of Industrial Engineering, Iran University of Science and Technology, Tehran, IranAbbasJokarPh.D. Candidate, School of Industrial Engineering, Iran University of Science and Technology, Tehran, IranJournal Article20161027In this study, a two phase hybrid heuristic approach was proposed to solve the multi-depot multi-vehicle inventory routing problem (MDMVIRP). Inventory routing problem (IRP) is one of the major issues in the supply chain networks that arise in the context of vendor managed systems (VMI) The MDMVIRP combines inventory management and routing decision. We are given on input a fleet of homogeneous vehicles, in which any of these vehicles have a capacity and a fixed cost. Also, a set of distribution centers with restricted capacities are responsible to serve the customer’s demands, which are known for distributer at beginning of each period. The problem consists of determining the delivery quantity to the customers at each period and the routes to be performed to satisfy the demand of the customers. The objective function of this problem is to minimize sum of the holding cost at distributer centers and the customers, and of the transportation costs associated to the preformed routes. In the proposed hybrid heuristic method, after a Construction phase (first phase) a modified variable neighborhood search algorithm (VNS), with distinct neighborhood structures, is used during the improvement phase (second phase). Moreover, we use simulated annealing (SA) concept to avoid that the solution remains in a local optimum for a given number of iterations. Computational results on benchmark instances that adopt from the literature of IRP indicate that the proposed algorithm is capable to find, within reasonable computing time, several solutions gained by the approaches that applied in the previous published studies.
<span> </span>http://www.ijte.ir/article_44432_1b291d5ca549452863d9ae59be207248.pdfTarrahan Parseh Transportation Research InstituteInternational Journal of Transportation Engineering2322-259X4420170401Application of Support Vector Machine Regression for Predicting Critical Responses of Flexible Pavements3053154443310.22119/ijte.2017.44433ENAli RezaGhanizadehAssistant Professor, Department of Civil Engineering, Sirjan University of Technology, Sirjan, Iran0000-0002-6618-1049Journal Article20160824This paper aims to assess the application of Support Vector Machine (SVM) regression in order to analysis flexible pavements. To this end, 10000 Four-layer flexible pavement sections consisted of asphalt concrete layer, granular base layer, granular subbase layer, and subgrade soil were analyzed under the effect of standard axle loading using multi-layered elastic theory and pavement critical responses including maximum tensile strain at the bottom of asphalt layer and maximum compressive strain at the top of subgrade soil were calculated. Then the support vector machine regression was used to predict these two critical responses. Results of this study show that the SVM can be used as a reliable tool to predict critical responses of flexible pavements. Analysis of flexible pavements using SVM needs less computing time and the SVM can be used as a quick tool for predicting fatigue and rutting lives of different pavement sections in comparison with multi-layer elastic theory and finite element method.http://www.ijte.ir/article_44433_c590b8e5b4f1a5fe839466462e187182.pdfTarrahan Parseh Transportation Research InstituteInternational Journal of Transportation Engineering2322-259X4420170401Analytical Study of Dynamic Response of Railway on Partial Elastic Foundation under Travelling Accelerating Concentrated Load3173344443410.22119/ijte.2017.44434ENAminGhannadiaslAssistant Professor, Faculty of Engineering, University of Mohaghegh Ardabili, Ardabil, IranJournal Article20160217The dynamic response of the railway under accelerated moving load using Dynamic Green Function is presented in this paper. For this purpose, an exact and direct modeling technique is introduced for the railway modeling as the damped Euler-Bernoulli beam on the partial Winkler foundation with arbitrary boundary conditions subjected to the moving load. The effects of the elastic coefficient of Winkler foundation, as well as velocity and accelerate of the moving load are assessed. The results are shown that the maximum deflection depends on the increasing or decreasing acceleration of the moving load. On the other hands, it does not occur at the central point of the beam for all acceleration values. Based on the results, the acceleration value of load dominantly defines the dynamic deflection shape of the Euler-Bernoulli beam. Some numerical examples are shown to demonstrate the simplicity and efficiency of the Dynamic Green Function in the new formulation, in this paper.http://www.ijte.ir/article_44434_495cd6b045fdfa107a9536275bba0509.pdfTarrahan Parseh Transportation Research InstituteInternational Journal of Transportation Engineering2322-259X4420170401Evaluation of Fatigue Properties of Asphalt Mixtures Containing Reclaimed Asphalt using Response Surface Method3353504443510.22119/ijte.2017.44435ENBabakGolchinAssistant Professor, Department of Civil Engineering, Ahar Branch, Islamic Azad University, Ahar, IranAhmadMansourianDepartment of Bitumen and Asphalt, Road, Housing and Urban Development Research Center, Tehran, IranJournal Article20160916This paper presents the effects of different amounts of reclaimed asphalt on fatigue life of asphalt mixtures. Central composite method was used to design of experiments based on response surface method (RSM). Binder type (Pen 60/70 and Pen 85/100), reclaimed asphalt pavement (RAP) content (25, 50 and 75%) and loading strain (150, 250 and 350 micro strain) were selected as independent variables, while 50% of initial stiffness, fatigue life and final stiffness of asphalt mixtures were chosen as dependent variables. In this research study, fatigue properties of asphalt mixtures were measured by using the four-point bending beam. The RSM analyses showed that all independent variables were significant factors for prediction of 50% of initial stiffness and fatigue life. In addition, analysis of the tests results showed that the mixtures containing higher amount of RAP at lower strains, had higher final stiffness. Furthermore, the fatigue life of specimens increased, when the level of test strains decreased. Also at the lower level of loading strain, by increasing the RAP content, the fatigue life was not decreased.http://www.ijte.ir/article_44435_658bdae888193156bd7d5c18ce3bd6d4.pdfTarrahan Parseh Transportation Research InstituteInternational Journal of Transportation Engineering2322-259X4420170401Analysis of the strength of hot in-place recycled asphalt, its affecting factors and its comparison with conventional methods3513584443610.22119/ijte.2017.44436ENDavodKayediMSc., Department of Engineering, Boroujerd Branch, Islamic Azad University, Boroujerd, IranMojtabaHosseiniAssociate Professor, Department of Engineering, Lorestan University, Khorramabad, IranRadMortazaviBSc., Department of Engineering, Lorestan University, Khorramabad, Iran.Journal Article20160405In recent decades, economic development and population growth in the world has led to the expansion of road networks. Therefore the use of optimum methods for repairing and maintenance of these roads is considered as an important value. Today one of the options in this regard, is the use of asphalt recycling technology. The present study which took place in the summer of 2015 in Iran, Lorestan province, is in line with this target with the goal to compare the recycling of asphalt with the common methods as well as the qualitative assessment of each method. In this study which was based on the analysis of asphalt samples from the Khorramabad-boroujerd route and samples from Arak-Qoms hot in-place recycling project, 9 laboratory samples were made using recycled asphalt pavements in accordance with the regulations of hot asphalt recycling of Iran. These samples were made using 80% recycled asphalt pavements which were collected from 3 different locations from lorestan province, as well as 20% raw and new materials. After conducting the quality control tests for asphalt on the 9 samples, one of the 9 samples that had higher technical specifications and was more in accordance with the Arak-Qoms recycling project mix design, was chosen as the optimal sample. The optimum samples test results were analyzed, compared and evaluated with the two projects mentioned above. The results showed that although both methods were in range with the minimum and maximum technical quality specifications, the recycling method had higher quality and technical specifications.http://www.ijte.ir/article_44436_3544e424ddb90271172feb1b676a9e60.pdf