@article { author = {Saydi, Jaber and Zavarzadeh, Gholamali}, title = {Prioritizing Vehicles that Carry Important Characters (Political) When Crossing Signalized Intersections}, journal = {Journal of Civil Engineering and Materials Application}, volume = {2}, number = {4}, pages = {165-180}, year = {2018}, publisher = {PenPub}, issn = {2676-332X}, eissn = {2588-2880}, doi = {10.22034/jcema.2018.91997}, abstract = {In the urban transportation network as the traffic signals went green at the intersection of the upper hand, a group of vehi-cles move together and arrive at the next intersection, almost in group. If, at the same time as the group arrives, the signal of the corresponding route at this intersection is green, the total delay and stop of the vehicles will be significantly reduced and the intersection efficiency will increase significantly. The same strategy was implemented on the political vehicles in the study, so that the delay and stop time for them could be reduced. In this study, part of the political vehicle route from Saad-Abad Palace to the presidential office on Pasteur Street is considered. In this study, various strategies were developed to prioritize the vehicles in the Aimsun simulator software. Then, to detect the arrival of these vehicles to the intersection, two identifiers were embedded, one before the intersection and the other after it was installed. Among the results of this study are the following: There is an average increase in the average travel time for a scenario with an extra green time of 10 se-conds and 15 seconds. The average delay time was 7 seconds for the additional green time scenario of 10 seconds and the average delay of 6 seconds for the sub-scenario of 15 seconds increased. The average number of stops per vehicle in-creased by 0.1 stops per vehicle in both cases.}, keywords = {Road intersection,Prioritization,Political Vehicle,Decreasing travel time}, url = {https://www.jcema.com/article_91997.html}, eprint = {https://www.jcema.com/article_91997_862672e4db5ac3a12ef94ad038591007.pdf} } @article { author = {Shamsashtiany, Reza and Ameri, Mahmoud}, title = {Road Accidents Prediction with Multilayer Perceptron MLP modelling Case Study: Roads of Qazvin, Zanjan and Hamadan}, journal = {Journal of Civil Engineering and Materials Application}, volume = {2}, number = {4}, pages = {181-192}, year = {2018}, publisher = {PenPub}, issn = {2676-332X}, eissn = {2588-2880}, doi = {10.22034/jcema.2018.91998}, abstract = {Demand growth this has increased the incidence of road accidents and the resulting casualties, including injuries and deaths. In this study, six of the rural two lane roads were selected as the study area and crash data was collected in the roads for 2013-2016 years. In this study, multi-la ered perceptron model was used for modeling crashes for different roads. The purpose of the multi-layered perceptron model training is to find the optimal value of weights and biases in such a way as to minimize network error. With this view, multi-layered perceptron modeling is an optimization issue with a number of specific parameters. Based on the collected data, the studied roads included Hamadan to Avaj, Hamedan to Qorveh, Hamadan to Malayer and Hamadan to Bijar in the area of the protection of Hamadan province, as well as Abhar to Qeydar in the area of protection of Zanjan province and the old road to Abeek to Qazvin, in Qazvin province. An appropriate model for the roads of Qazvin, Zanjan and Hamadan was architectu e. Approximately good results were obtained from the network. The value of the r2 statistic that was calculated was 0.83. The value of the MSE parameter equals to 0.59, which indicates the accuracy of the results in the training phase. For the roads of the Qazvin region, the value of r2 was 0.94. The value of the MSE parameter was also 0.33, which was very good, and showed the accuracy of the results in the training phase.}, keywords = {Safety improvement,Accident Modeling,Multilayer Perceptron MLP}, url = {https://www.jcema.com/article_91998.html}, eprint = {https://www.jcema.com/article_91998_1934a71b4d38f4a1815c26445d4ce688.pdf} } @article { author = {Naseri, Farzad and Bagherzadeh Khalkhali, Ahad}, title = {Evaluation of Seismic Performance of Concrete Gravity Dams Under Soil-structure-reservoir Interaction Exposed to Vertical Component of Near-field Earthquakes During Impounding Case study: Pine Flat Dam}, journal = {Journal of Civil Engineering and Materials Application}, volume = {2}, number = {4}, pages = {181-191}, year = {2018}, publisher = {PenPub}, issn = {2676-332X}, eissn = {2588-2880}, doi = {10.22034/jcema.2018.91999}, abstract = {Given the current water crisis in the world and the fact that dams are superstructures for water conservation in agricultural and domestic uses, the seismic performance of Pine Flat Dam is evaluated under the soil-structure-reservoir interaction ex-posed to vertical component of near-field earthquakes in this study. Hence the dam is modeled in the plane strain space un-der the foundation-structure-fluid interaction using Abaqus finite element software in order to consider the effects of founda-tion flexibility and hydrodynamic forces. The reservoir is modeled in 3 full, half-full and empty conditions and the results are assessed and presented for each condition. The results of analysis show that when the dam is in use and the entire volume of reservoir is filled with water and the conditions of near-field earthquakes are predominated, more displacement is applied to the dam, which may make it enter the nonlinear region.}, keywords = {water crisis,Concrete dam,Effect of vertical component,Soil-structure-reservoir interaction,Near-field fault}, url = {https://www.jcema.com/article_91999.html}, eprint = {https://www.jcema.com/article_91999_41dc9fa934f301015ee8c70f0f032242.pdf} } @article { author = {Abkar, Goudarz and Lorki, Amir Ashtar}, title = {Evaluation of Progressive Collapse in Steel Structures Designed Based on Iranian Code of Practice for Seismic Resistant Design Buildings (Standard No. 2800), 4th Edition and Iranian National Building Code 'INBC', Part 10}, journal = {Journal of Civil Engineering and Materials Application}, volume = {2}, number = {4}, pages = {192-200}, year = {2018}, publisher = {PenPub}, issn = {2676-332X}, eissn = {2588-2880}, doi = {10.22034/jcema.2018.92000}, abstract = {In this study, the progressive collapse is examined in steel structures with 4-, 8- and 10-story dual systems of moment resistant and braced frames. Probable risks and unusual loads can lead to progressive collapse in structures, e.g. design or construction errors, fires, gas explosions, accidental overloading, car accidents, bomb explosions, etc. Given the action of these forces over a relatively short period, the dynamic analysis of these incidents appears necessary. In this study, the effect of mentioned incidents is considered through the sudden loss of a member. The studied buildings are designed based to the Iranian National Building Code, Part 6 and Part 10 and Iranian Code of Practice for Seismic Resistant Design Buildings (Standard No. 2800), 4th edition. The structural frames are simulated by finite element method using Abaqus finite element software in order to assess the forces and displacements created in the members. Subsequently, the dynamic response of structure is determined according to the loads and how they are applied to the structure, items of analysis process model (APM) and sudden loss of members. The results of analyses suggest that the loss of middle columns in the studied braced frames is more critical than the loss of corner columns. In other words, the central columns of perimeter frame are more vulnerable than the corner columns.}, keywords = {Progressive collapse,Steel structures,Iranian Code of Practice,progressive failure,ABAQUS}, url = {https://www.jcema.com/article_92000.html}, eprint = {https://www.jcema.com/article_92000_0a67fd9bff78683edba5d6d5c4875846.pdf} } @article { author = {Yaghouti Lighvan, Amir and Hajialilu Bonab, Masoud}, title = {Investigation into Effect of Liquefaction on Behavior of Retaining Wall}, journal = {Journal of Civil Engineering and Materials Application}, volume = {2}, number = {4}, pages = {201-215}, year = {2018}, publisher = {PenPub}, issn = {2676-332X}, eissn = {2588-2880}, doi = {10.22034/jcema.2018.92001}, abstract = {Retaining walls constructed adjacent to underground water are the structures which may be influenced by liquefaction. The design of these structures under vibration involves determining their displacements and forces caused by earthquake and liquefaction phenomena. In this study, it is attempted to assess the effect of liquefaction on the behavior of retaining walls using finite element method (FEM). The OPENSEES software is used for this purpose, which can simulate the behavior of saturated porous media using the u-P correlation formulation. Moreover, the Dafalias-Manzari critical state two-surface plas- ticity behavioral model is applied to simulate the behavior of sand, which can model a variety of behaviors of saturated sand in various uniaxial and cyclic loadings under drained and undrained conditions for different relative densities. The results of this study suggest that the OPENSEES software and Dafalias-Manzar behavioral model possess essential capabilities for numerical modeling of behavior of retaining walls under liquefaction conditions. The presence of retaining walls also chang- es the pattern of development of excess pore water pressure, particularly at middle depths of the wall.}, keywords = {Retaining wall,Liquefaction,Saturated sand,Critical state}, url = {https://www.jcema.com/article_92001.html}, eprint = {https://www.jcema.com/article_92001_481a86898921a724331781290f387eea.pdf} }