@article { author = {parsaie, A. and Haghiabi, A.H. and Shamsi, Z.}, title = {Intelligent Modeling of Discharge Coefficient of Lateral Intakes}, journal = {AUT Journal of Civil Engineering}, volume = {2}, number = {1}, pages = {3-10}, year = {2018}, publisher = {Amirkabir University of Technology}, issn = {2588-2899}, eissn = {2588-2902}, doi = {10.22060/ajce.2018.14241.5466}, abstract = {Intake structures have been widely used for flow diversion in the irrigation and drainage networks. In this paper, the multivariate adaptive regression splines (MARS), artificial neural network (ANN), and support vector machine (SVM) techniques were utilized for prediction of discharge coefficient (Cd) of lateral intakes. The experimental data pertaining to dimensionless parameters on Cd were collected to develop the models. The results indicated that the best performance in modeling is related to the MARS model with R2=0.98 and RMSE=0.023 and the MARS model outperforms the ANN and SVM models. The tangent sigmoid and radial basic functions were found to be the most efficient transfer and kernel functions for ANN and SVM, respectively. Moreover, Froude number (Fr1) and the ratio of the weir height to the upstream flow depth (P/d1) were the most effective factors for predicting Cd. Evaluation of the performance of applied models in term of developed discrepancy ratio (DDR) index shows that the minimum data dispersivity is related to the MARS model.}, keywords = {Flow Measurement,Multivariate Adaptive Regression Splines,neural networks,Support Vector Machine}, url = {https://ajce.aut.ac.ir/article_2933.html}, eprint = {https://ajce.aut.ac.ir/article_2933_f4531cc0cebdd100510554b820892ee5.pdf} } @article { author = {Talaei, R.}, title = {A Combined Model for Landslide Susceptibility, Hazard and Risk Assessment}, journal = {AUT Journal of Civil Engineering}, volume = {2}, number = {1}, pages = {11-28}, year = {2018}, publisher = {Amirkabir University of Technology}, issn = {2588-2899}, eissn = {2588-2902}, doi = {10.22060/ajce.2018.14235.5465}, abstract = {This paper proposes a combined model for landslide susceptibility, hazard and risk assessment based on a spatial prediction method and the fuzzy sets theory using geographical information systems (GIS). To evaluate landslide susceptibility and hazard in the study area in the northwest of Iran, the first step was the construction of a database, which includes three different data groups namely conditioning and triggering factors and the landslide inventory data. A landslide susceptibility model was constructed by using favorability function method and conditioning data. The selected landslides were of moderate to high intensity, which had occurred or reactivated at least once over the last 55 years. Landslide susceptibility map (LSM) was transformed into landslide hazard map (LHM) by using the regional seismic and precipitation data. Desirably, the accuracy of susceptibility and hazard models were determined 84.9% and 84.8%, respectively, by using the receiver operating characteristic (ROC) curve method. Layers of the landslide hazard potential (LHP) and resource damage potential (RDP) were integrated based on the fuzzy algebraic product operator in order to determine the risk level due to landslides. Lastly yet most importantly, the results of the study were integrated in the risk prevention and land use planning.}, keywords = {Damage,Hazard,Landslide,Prediction,Risk}, url = {https://ajce.aut.ac.ir/article_2929.html}, eprint = {https://ajce.aut.ac.ir/article_2929_86bdf954802cc0c5b4249340b93dceb7.pdf} } @article { author = {Ashayeri, I. and Biglari, M. and Shamoradi, S.B. and Rashidi Gouya, Hosein}, title = {Probabilistic Seismic Hazard Assessment and Geotechnical Seismic Micro-zonation of Kangavar with Ambient Vibration and Electrical Resistivity Analysis}, journal = {AUT Journal of Civil Engineering}, volume = {2}, number = {1}, pages = {29-38}, year = {2018}, publisher = {Amirkabir University of Technology}, issn = {2588-2899}, eissn = {2588-2902}, doi = {10.22060/ajce.2018.14494.5479}, abstract = {Kangavar city is located at Kermanshah province west of Iran and northern part of Zagros Mountains. Zagros is known to be the most seismic region in Iran. Thus, seismicity and geotechnical micro-zonation of Kangavar are set the goals of this research. To do this, firstly, following a probabilistic seismic hazard analysis the peak ground acceleration and spectral acceleration on seismic bedrock is elaborated using the CRISIS2007 software. Secondly, to investigate the site conditions series of microtremor measurements at 15 points in the vicinity of the city is carried out and the natural frequency map and shear wave velocity profile for the ground are determined using Geopsy software. This should note that the thickness of the alluvial is small in northern part of the city. Furthermore, the results of electrical resistivity tests are used to investigate the alluvium depth and discontinuity in ground profile. This analysis confirmed the existence of thicker alluvial in southeast part of the city. Finally, according to all findings of this research a general recommendation for urban planning and future building and construction is proposed according to Iranian national code for earthquake resistant buildings, as a function of three variables; Geo-hazards type, Importance, and lateral resistant structural system.}, keywords = {Kangavar City,PSHA,Geotechnical Seismic Microzonation,Ambient Vibration,Electrical Resistivity}, url = {https://ajce.aut.ac.ir/article_2924.html}, eprint = {https://ajce.aut.ac.ir/article_2924_ffaa4f54e35b8d899c04b5ec81b03643.pdf} } @article { author = {Zeynali, M.J and Shahidi, A.}, title = {Performance Assessment of Grasshopper Optimization Algorithm for Optimizing Coefficients of Sediment Rating Curve}, journal = {AUT Journal of Civil Engineering}, volume = {2}, number = {1}, pages = {39-48}, year = {2018}, publisher = {Amirkabir University of Technology}, issn = {2588-2899}, eissn = {2588-2902}, doi = {10.22060/ajce.2018.14511.5480}, abstract = {One of the most common methods for estimating suspended sediment of rivers is sediment rating curve. For better estimation of the amount of suspended sediment based on the sediment curve rating equation, it is possible to optimize its coefficients. One of the methods used for optimizing the coefficients of the sediment curve rating equation is taking advantage of meta-heuristic algorithms. The main objective of this research is the use of grasshopper optimisation algorithm to optimize the relationship between discharge and sediment discharge and comparison the results of this model with genetic algorithms and particle swarm. With respect to the objective function, which minimizes the difference between the measured values of the sediment and the calculated values of that, the optimal values of these coefficients are determined. The results of this research indicated since the objective function, grasshopper optimisation algorithm compared with Genetic algorithm and particle swarm optimization has a good performance. So that grasshopper optimisation algorithm with 7694507 values has the best performance in this problem and then PSO and GA algorithms with 7702357 and 7703750 have a good performance and finally this value in sediment rating curve is equal to 9163544.}, keywords = {genetic algorithm,Met-Heuristic Algorithm,Particle swarm algorithm,Suspended Sediment}, url = {https://ajce.aut.ac.ir/article_2923.html}, eprint = {https://ajce.aut.ac.ir/article_2923_627e10a49f59de656a545b4328927437.pdf} } @article { author = {Shakarami, B. and Kabir, M. Z. and Sistani Nezhad, R.}, title = {Parametric Study on Confined Masonry Walls Subjected to In-plane Cyclic Loading Through Numerical Modeling}, journal = {AUT Journal of Civil Engineering}, volume = {2}, number = {1}, pages = {49-58}, year = {2018}, publisher = {Amirkabir University of Technology}, issn = {2588-2899}, eissn = {2588-2902}, doi = {10.22060/ajce.2018.12560.5257}, abstract = {Results of numerical study on confined masonry walls are described in this paper, which presents a discussion on the behavior of confined masonry walls with different aspect and reinforcement ratio subjected to the in-plane horizontal loads, using advanced numerical simulations in LS-DYNA environment. A non-linear finite element micro-model based on smeared crack and total strain-stress models is used to examine existing tested masonry walls. The masonry units include solid clay bricks and concrete blocks, the mortar and bonding interfaces between the units and mortar have been lumped in continuum elements. In order to validate micro-modeling strategy the input data is based on a combined confined wall which was previously tested in the literature with a clearly identification and justification. The numerical results are presented as force-displacement curves, types of failure modes, ductility and energy absorption. It was observed that the confined walls with an aspect ratio of (h/l=1) shows better performance in terms of resisting mechanism, deformability and energy absorption.}, keywords = {Confined Masonry Wall,FE Modeling,In-plane Response,Cyclic loading,Ductility,Energy Absorption}, url = {https://ajce.aut.ac.ir/article_2843.html}, eprint = {https://ajce.aut.ac.ir/article_2843_8839d78a25f1bb62ad02a0d8ffbdfb6e.pdf} } @article { author = {Keykha, A.H.}, title = {Behavior of Deficient Steel Members Strengthened Using CFRP Under Combined Compressive Load and Torsional Moment}, journal = {AUT Journal of Civil Engineering}, volume = {2}, number = {1}, pages = {59-68}, year = {2018}, publisher = {Amirkabir University of Technology}, issn = {2588-2899}, eissn = {2588-2902}, doi = {10.22060/ajce.2018.13935.5457}, abstract = {Strengthening steel structures using carbon fiber reinforced polymer (CFRP) has attracted the attention of many researchers in recent years. Most previous research in this area has carried out on the behavior of the steel members without deficiency in bending, shear, and compression. The deficiency in steel structures may be created due to the errors caused by construction, fatigue cracking, and so on. In addition, steel structures may be located under combined loads in their lifetime. This study explored the effect of CFRP strengthening on the structural behaviors of square hollow sections (SHS) steel members having initial deficiencies under combined compressive load and torsional moment. To the author’s knowledge, there is no independent article in this area. In this study, 17 specimens were analyzed. To analyze the specimens, three dimensional (3D) modeling and nonlinear static analysis using ANSYS software were applied. The results indicated that application of CFRP sheets for the strengthening of the deficient hollow steel members under combined compressive load and torsional moment could recover the strength lost due to deficiency, significantly. The maximum recovery percentage of the compressive load and torsional moment capacity of the specimens was 256.00% and 139.96%, respectively.}, keywords = {Hollow Steel Members,Strengthening,CFRP,Torsional Loading,Compressive Loading}, url = {https://ajce.aut.ac.ir/article_2841.html}, eprint = {https://ajce.aut.ac.ir/article_2841_caf8bc41a02df9d01798c80afc4afa3e.pdf} } @article { author = {Saadatfar, S. and Zahmatkesh, A.}, title = {Evaluation of Underwater Blast on Concrete Gravity Dams Using Three-Dimensional Finite-Element Model}, journal = {AUT Journal of Civil Engineering}, volume = {2}, number = {1}, pages = {69-78}, year = {2018}, publisher = {Amirkabir University of Technology}, issn = {2588-2899}, eissn = {2588-2902}, doi = {10.22060/ajce.2018.13467.5416}, abstract = {Dams may undergo the air or underwater blast loading. An underwater explosion can cause significantly more damage to targets in water as compared to an explosion of the same magnitude in the air. It is well known that underwater explosions damage structures of dams by shockwaves and bubble pulsations. This paper studies the effect of the underwater explosion on a concrete gravity dam in different blast locations, with and without considering bubble pulsations. Concrete Damage Plasticity (CDP) is a model that can be used to characterize the constitutive behavior of concrete by introducing scalar damage variables. The results showed that damage was most visible when an explosion occurred in the middle of the reservoir. Damages were significantly higher in the case of bubble impulse dams. According to the results of the damage, bubble pulsation is an explosion in one of the main parts and includes part of blasts energy. Therefore, the amounts of displacement for cases with gas bubble effects were significantly higher than those with an explosion modeled only on the application of shockwaves. The existence of sediments and surface waves can be considered in further studies.}, keywords = {Underwater Explosion,Concrete Gravity Dam,Bubble Pulsation,Shockwave Load}, url = {https://ajce.aut.ac.ir/article_2840.html}, eprint = {https://ajce.aut.ac.ir/article_2840_f541754d443f9d02f9ddedeb9eeadec5.pdf} } @article { author = {Karimpour-Fard, M. and Lashteh Neshaei, M.A. and Karimnader-Shalkouhi, S.}, title = {Evolutionary Polynomial Regression-Based Models to Estimate Stability of Gravity Hunched Back Quay Walls}, journal = {AUT Journal of Civil Engineering}, volume = {2}, number = {1}, pages = {79-86}, year = {2018}, publisher = {Amirkabir University of Technology}, issn = {2588-2899}, eissn = {2588-2902}, doi = {10.22060/ajce.2018.13198.5250}, abstract = {This paper presents a new approach, based on Evolutionary Polynomial Regression (EPR), for predicting the safety factors of a quay wall against sliding, overturning and bearing capacity failure as functions of the soil’s shear strength parameters, geometry of the wall and loading conditions. To this end, a database of around 80000 data sets was created based on a conceptual model, employing a MATLAB-aided program. Based on input and output values of this database and employing EPR, three different models for the estimation of safety factors were developed and their results were compared with the values in the database. Investigation into the performance of the developed models indicates that these models are capable of estimating the stability of quay walls with a precision of around 95%. Parametric analyses were performed on the models to identify parameters with a key role in the stability of quay walls. The parametric studies were indicative of the models’ ability in capturing the effects of individual parameters on the wall safety factors, therefore proving the models helpful as tools in the preliminary design of gravity quay walls.}, keywords = {Hunched Back Quay Wall,Sliding,Overturning,Bearing Capacity,Evolutionary Polynomial regression}, url = {https://ajce.aut.ac.ir/article_2839.html}, eprint = {https://ajce.aut.ac.ir/article_2839_900152ed9428723d2e504dce8cef0537.pdf} } @article { author = {Mohammed, M. H.}, title = {Shear Behavior of Reactive Powder Concrete Beams with and without Coarse Aggregate}, journal = {AUT Journal of Civil Engineering}, volume = {2}, number = {1}, pages = {87-96}, year = {2018}, publisher = {Amirkabir University of Technology}, issn = {2588-2899}, eissn = {2588-2902}, doi = {10.22060/ceej.2017.12210.5145}, abstract = {This paper presents an experimental investigation consists of casting and testing in shear seven rectangular simply supported reinforced concrete beams. Two of the tested beams are made with reactive powder concrete (RPC) without coarse aggregate and five with reactive powder concrete with coarse aggregate which is called modified reactive powder concrete (MRPC). Experimental results have generally shown that coarse aggregate had a positive effect on shear behavior of MRPC beams and higher ultimate loads (Pu) are obtained with the increase of steel fibers volumetric ratio (Vf) and longitudinal steel ratio (ρ). Results also showed that using relatively high steel fiber ratio of 2% changes the mode of failure from brittle shear to ductile flexural one. It is, therefore, concluded that RPC and MRPC beams can be made without transverse shear reinforcement bars (stirrups).}, keywords = {Reactive Powder Concrete,Shear Behavior,Coarse Aggregate}, url = {https://ajce.aut.ac.ir/article_2755.html}, eprint = {https://ajce.aut.ac.ir/article_2755_ec8ffafd334543251d1eae2688b5556e.pdf} } @article { author = {Ramezanianpour1, A. A. and Balapour, M. and Hajibandeh, E.}, title = {Effect of Nano Rice Husk Ash Against Penetration of Chloride Ions in Mortars}, journal = {AUT Journal of Civil Engineering}, volume = {2}, number = {1}, pages = {97-102}, year = {2018}, publisher = {Amirkabir University of Technology}, issn = {2588-2899}, eissn = {2588-2902}, doi = {10.22060/ajce.2017.12387.5203}, abstract = {These days, in the structural designing, the durability properties of materials should be considered as significant as the other specifications. Deterioration of concretes in corrosive environments leads to considerable costs in order to maintain the reinforced concrete structures. Usage of industrial pozzolans can improve quality and serviceability of concrete structures in such environments. Nowadays, one of the most common pozzolans in structural concretes is the rice husk ash (RHA) which enhances the mechanical and durability properties of concretes. In this paper, effects of nano RHA on chloride permeability, compressive strength, electrical resistivity and capillary absorption of mortars have been investigated. The results showed that the incorporation of RHA nanoparticles gradually increased the compressive strength. It was found that a partial replacement of cement by nano RHA would enhance the durability properties of mortars in the long-term.}, keywords = {Rice Husk Ash,Nano,Durability,Mortar,Mechanical Properties}, url = {https://ajce.aut.ac.ir/article_1167.html}, eprint = {https://ajce.aut.ac.ir/article_1167_9708a5c1554b80bfcfcb6dff51a92c62.pdf} } @article { author = {Mousavi Qieh-Qeshlaghi, P. and Sabouri-Ghomi, S.}, title = {Theoretical and Experimental Study on Steel Plate Shear Wall with Unequal Columns}, journal = {AUT Journal of Civil Engineering}, volume = {2}, number = {1}, pages = {103-114}, year = {2018}, publisher = {Amirkabir University of Technology}, issn = {2588-2899}, eissn = {2588-2902}, doi = {10.22060/ajce.2017.12425.5213}, abstract = {Steel plate shear walls with openings are highly interested because of their architectural aspects. A particular type of these systems is the steel plate shear wall with a door-shaped opening; the opening is continued from the base to top beam and surrounded by vertical boundary elements relatively weaker to main columns. Assuming the pure shear behavior for this system, each of the side panels can be considered a steel plate shear wall with unequal VBEs (vertical boundary elements). Behavior of this type of steel shear walls cannot be predicted by the common relations of steel shear walls; therefore, it has not been covered in technical literature until now. In this study, the behavior of steel plate shear wall with one strong and one weak column is theoretically and experimentally investigated. Theoretical relations to define the load-displacement curve and the inclination angle of tension field are proposed. An experimental model of a steel shear wall with unequal columns is fabricated and tested under cyclic quasi-static loading. Results of the experimental tests including load-displacement curve, plastic hinges location and inclination angle of tension field are compared with theoretical results.}, keywords = {Steel Plate Shear Walls,Door Type Opening,Unequal Columns,Plate-frame Interaction Theory,Tension Field Action}, url = {https://ajce.aut.ac.ir/article_916.html}, eprint = {https://ajce.aut.ac.ir/article_916_1b3249deb0c4a38d0263a21e450b5bdf.pdf} } @article { author = {Nazeri Tahroudi, M. and Ahmadi, F. and Khalili, K.}, title = {Impact of 30 Years Changing of River Flow on Urmia Lake Basin}, journal = {AUT Journal of Civil Engineering}, volume = {2}, number = {1}, pages = {115-122}, year = {2018}, publisher = {Amirkabir University of Technology}, issn = {2588-2899}, eissn = {2588-2902}, doi = {10.22060/ajce.2018.14520.5481}, abstract = {Changes in the amount and distribution of flow discharge are a remarkable manifestation of climate change. Reducing or increasing the amount of flow discharge affects many other climatic and environmental phenomena such as runoff, flood, humidity and also affect many human activities such as agriculture, economics ,the fight against soil erosion and so on. In this study, the trend of river flow discharge in the Urmia lake basin was investigated in two annual and monthly scales using modified non-parametric Mann-Kendall test (MMK) with complete removal of the self-correlation structure. To this end, 26 hydrometric stations were surveyed in the Urmia Lake basin during the statistical period of 1984-2013. Also, non-parametric Pettitt test was used to determine the time of change in flow trend. The results of the trend of the studied stations in the Urmia lake basin showed that the course of the changes in the flow discharge is decreasing in most months. On a yearly scale, at all stations, there was a trend of decreasing flow in the basin area. Also, the trend of flow discharge decline is more intense in both autumn and winter. The time of change in the decreasing trend of the flow discharge in the Urmia Lake basin was also taking place between 1994 and 1998. Also the results indicated that the decreasing trend of Urmia Lake water level data occurred one year after the decreasing trend in flow data.}, keywords = {Modified Kendall,Pettitt Test,Trend,Urmia Lake}, url = {https://ajce.aut.ac.ir/article_2950.html}, eprint = {https://ajce.aut.ac.ir/article_2950_c140fed72868201ffe73b320e3396fc8.pdf} }