Journal of Civil Engineering and Materials Application

Journal Information
EISSN : 2588-2880
Published by: Agial Publishing House (10.15412)
Total articles ≅ 14

Latest articles in this journal

, , Sayed Hamid Reza Barnjani
Journal of Civil Engineering and Materials Application, Volume 1, pp 33-38; https://doi.org/10.15412/j.jcema.12010202

Abstract:
Spur dikes are river training structures used for prevention of erosion at river banks and cause distancing of flow from the critical zone and creation of local contraction in water flow. In the present study, 2D modeling of the flow pattern around a spur dike in a straight canal with 6m length and 0.45m width is presented. Also the finite element method is utilized for solving the differential equations. Modeling of the turbulent flow around a single spur dike is performed using k-ε model in ANSYS software and the results were compared to those of the experimental study. The results show that the finite element method, by incorporating the k-ε model, models the flow pattern around the spur dike well and yields an average error value of 12.57%, and this shows a good agreement between the numerical modeling results and those of the experimental study.
, Sayed Hamid Reza Barnjani,
Journal of Civil Engineering and Materials Application, Volume 1, pp 22-27; https://doi.org/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.
, Sina Lotfollahi, Ahad Bagherzadeh Khalkhali
Journal of Civil Engineering and Materials Application, Volume 1, pp 39-44; https://doi.org/10.15412/j.jcema.12010201

Abstract:
Dynamic rock mechanics investigates the mechanical behavior of rock under dynamic loading conditions and change in mechanical properties of the rock. Loading techniques were almost used for both intermediate and high strain rate tests. In this work, dynamic tests and dynamic mechanical behavior of rock materials were studied. Dynamic tests were discussed to predict the stress-strain behavior. Different dynamic mechanical properties of rock materials including uniaxial and triaxial compressive strength, tensile strength, shear strength and fracture toughness were summarized. The effect of pressure, temperature and water saturation as well as microstructure, size and shape of rock on the mechanical properties of rock materials was considered.
M. Naserifard, S. Piroozbakht, M. Dashti Rahmat Abadi
Journal of Civil Engineering and Materials Application, Volume 1; https://doi.org/10.15412/j.jcema.12010302

Abstract:
Providing advanced publishing systems for journals, providing specialized services for authors and students, advanced services to libraries and scientific information indexing units, holding and hosting scientific conferences, scientific workshops and accepting PhD students in journal management.
, Masoud Khodadadifard, Shahriar Afandizadeh
Journal of Civil Engineering and Materials Application, Volume 1, pp 8-15; https://doi.org/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.
Sayed Hamid Reza Barnjani, ,
Journal of Civil Engineering and Materials Application, Volume 1, pp 28-32; https://doi.org/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-ε turbulence models are investigated in determining the rotational flow and flow field around the spur-dike using FLUENT software. The results show that the software incorporating the k-ε model could appropriately model velocity distribution around the spur dike and the results exhibit a good compatibility with an average error of 9.24%.
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