@article { author = {Bazazan Lotfi, Soroush and Rahimi, Mahmoud}, title = {A Study on Vulnerability of Urban Neighborhoods to Earthquake (Case Study: Farahzad Neighborhood, Tehran)}, journal = {Journal of Civil Engineering and Materials Application}, volume = {1}, number = {1}, pages = {1-7}, year = {2017}, publisher = {PenPub}, issn = {2676-332X}, eissn = {2588-2880}, doi = {10.15412/J.JCEMA.12010101}, abstract = {Iran is considered as one of the most seismic countries in the world and its cities have been frequently damaged by this natural phenomenon. Tehran, as the first metropolis of the country, is no exception to this, and prone to damage also due to its compactness, and being located on three active faults (Mesha fault, North Tehran fault, Rey fault). If activated, Mesha fault, North Tehran fault and Rey fault will destroy 20%, 35% and 55% of the city, respectively. Farahzad neighborhood in northern Tehran is one of the most seismic parts of Tehran metropolis. Hence, the main objective of this study is to investigate the seismicity of the neighborhood in terms of the risk of earthquakes. For this purpose, descriptive analysis, GIS software and Euclidean distance analysis were used. The results of this study showed that 57 hectares of Farahzad (136 hectares) with a relative area of 41% are located in a zone with a high earthquake risk (less than 400 m to the fault line). The area with a high seismic risk (400 to 800 meters) covers an area of 39 hectares, 29 percent of the total neighborhood. Also, 20 hectares of total residential buildings (34 hectares), with a relative area of over 58 percent, are located in a zone with a high risk of earthquakes.}, keywords = {vulnerability,earthquake,Crisis,Farahzad}, url = {https://www.jcema.com/article_91970.html}, eprint = {https://www.jcema.com/article_91970_88589a163da0395fc67cc55ebd5820b1.pdf} } @article { author = {Jafari Kang, Masood and Khodadadifard, Masoud and Afandizadeh, Shahriar}, title = {Providing a Decision-Making Method for Evaluation of Exclusive BRT lanes Implementation Using Benefit-Cost Analysis - Case Study: Tehran BRT line 4}, journal = {Journal of Civil Engineering and Materials Application}, volume = {1}, number = {1}, pages = {8-15}, year = {2017}, publisher = {PenPub}, issn = {2676-332X}, eissn = {2588-2880}, doi = {10.15412/J.JCEMA.12010102}, abstract = {Recently, the rapid growth of urbanization, in conjunction with a lack of proper transportation infrastructures, has raised traffic congestion in a great number of developing cities. The growing concern about traffic congestion persuades governments to promote public transit services which mostly need a substantial amount of money to implement. Budget limitations entice decision-makers to choose Bus Rapid Transit (BRT) systems as a less expensive solution. The implementation of BRT lines always comes with advantages and disadvantages. Furthermore decision-makers need a tool to evaluate the effects of converting a mixed-flow lane to a BRT lane. The main aim of this paper is to provide a decision- making criterion for the problem of lane conversion for BRT. To do so, Benefit-Cost Analysis (BCA) is applied, and finally, we assess Tehran BRT line 4, as a case study, in order to evaluate the impact of dedication of one lane to BRT on Chamran highway.}, keywords = {Traffic Congestion,bus rapid transit,BRT,Benefit,Cost analysis,BCA,benefit/cost ratio}, url = {https://www.jcema.com/article_91971.html}, eprint = {https://www.jcema.com/article_91971_b9e88e88dd299819160efdfcb04954d5.pdf} } @article { author = {Shabani, Shahin and Zarei, Shahrokh}, title = {Evaluation of Slippage Resistance of the Runway of the International Airport of Imam Khomeini}, journal = {Journal of Civil Engineering and Materials Application}, volume = {1}, number = {1}, pages = {16-21}, year = {2017}, publisher = {PenPub}, issn = {2676-332X}, eissn = {2588-2880}, doi = {10.15412/J.JCEMA.12010103}, abstract = {A layer of rubber surface in an aircraft will be separated by takeoff and landing in flight surfaces and these layers stick to the surface of the runway and by repetition, the thickness of these layers increases and improves lubrication and reduces the effect of signs on flight surfaces. In this paper, we prepared a diagrammatic presentation of test in the friction between eastern and western parts of the flight. Average values of friction of each of the three sections of the runway, in down stroke and up stroke, were measured once before tire removal operation and the second time after the tire relaxation and the exploitation rate index and minimum quality of flight surfaces were determined and then compared with the values and standards of the Federal Aviation Organization ICAO and international aviation regulations. The results show that the average coefficients of friction before removal of the tires, to the eastern part and the western part are 0.31 and 0.63, respectively which are lower than standard rates in comparison with standard values. And along with removal of tires, according to the minimum number of daily landings in runway of Imam Khomeini airport friction test should be measured every 4 months. Also, after tire removal, friction test should be carried out again and average friction coefficients for eastern and western parts were measured to be 0.72 and 0.67, respectively which were obtained after comparison with standard values.}, keywords = {friction,Runway,Slip resistance}, url = {https://www.jcema.com/article_91972.html}, eprint = {https://www.jcema.com/article_91972_a6406d07dd4d7e1c15375ea8a3f2c2f2.pdf} } @article { author = {Moradi Mofrad, Behrooz and Barnjani, Hamid Reza and Safari, Ahmad}, title = {Modeling of Turbulent Flow Due to the Dam Break Against Trapezoidal Barrier}, journal = {Journal of Civil Engineering and Materials Application}, volume = {1}, number = {1}, pages = {22-27}, year = {2017}, publisher = {PenPub}, issn = {2676-332X}, eissn = {2588-2880}, doi = {10.15412/J.JCEMA.12010104}, abstract = {Dam is considered as a strategic structure whose collapse and destruction is a catastrophic event and could bring about significant life threatening and financial losses. Also its destruction may cause environmental damages due to uncontrollable exit of large amounts of water and sediment from the reservoir which results into propagation of devastating flood at downstream. Presence of barriers and buildings changes the flow patterns downstream of a dam. Regarding the importance of this issue, in this research modeling of this phenomenon was performed in the presence of a trapezoidal barrier using the finite volume method and OpenFOAM software. Modeling is in 2D form and, for validation of the results, use has been made of the numerical and experimental research conducted by other researchers. The results show that this model has a good performance in simulation of these problems and has been able to simulate the results with a good accuracy, compared to the experimental results. For simulation of other phenomena similar to the dam break, the present model could be developed.}, keywords = {Dam Break,Two,Phase Flow,Finite volume,OpenFoam software}, url = {https://www.jcema.com/article_91973.html}, eprint = {https://www.jcema.com/article_91973_bcb9e4a670c00ff4638b84cf9ef29d17.pdf} } @article { author = {Barnjani, Sayed Hamid Reza and Safari, Ahmad and Moradi Mofrad, Behrooz}, title = {Numerical Simulation of Turbulence and Flow Velocity Distribution Around the Spur Dike Using FLUENT}, journal = {Journal of Civil Engineering and Materials Application}, volume = {1}, number = {1}, pages = {28-32}, year = {2017}, publisher = {PenPub}, issn = {2676-332X}, eissn = {2588-2880}, doi = {10.15412/J.JCEMA.12010105}, abstract = {Spur dikes are the intersecting or transverse structures, which are projected from the river bank toward the flow axis and cause diversion and direction of the flow from the banks towards central axis of the river. This structure affects the flow lines and causes change in the river flow pattern and protects the banks against erosion. Recognition of the flow pattern around a spur dike could help in a better understanding of the scour pattern and, as a result, achieving an accurate value of maximum scour depth. In this study, the k- turbulence models are investigated in determining the rotational flow and flow field around 𝜺 the spur-dike using FLUENT software. The results show that the software incorporating the k- model could appropriately 𝜺 model velocity distribution around the spur dike and the results exhibit a good compatibility with an average error of 9.24%.}, keywords = {Spur Dike,Flow Pattern,Velocity Distribution,Turbulence model}, url = {https://www.jcema.com/article_92045.html}, eprint = {https://www.jcema.com/article_92045_80f06133a9f968fd65278bf7200d1b4c.pdf} }