Amirkabir University of Technology Amirkabir Journal of Civil Engineering 2588-297X 46 1 2014 09 23 Synthetic Streamflow Generation using Artificial Neural Network Models Synthetic Streamflow Generation using Artificial Neural Network Models 1 10 326 10.22060/ceej.2014.326 FA Mostafa Yeganehfard M.Sc. Department of Civil & Environmental Engineering, Iran University of Science and Technology, Tehran, Iran Bagher Zahabioun Associate Professor, Department of Civil & Environmental Engineering, Iran University of Science & Technology, Tehran, Iran Journal Article 2010 01 11 In this study, capability of Artificial Neural Network (ANN) models for synthetic streamflow generation is evaluated. The used generating model compouned from ANN model and a random component with normal distribution. In model developing, the multilayer feedforward neural networks and back propagation learning algorithm has been used. Then long term synthetic streamflow series up tp 300 years of daily streamflow, using only observed daily streamflow in Khersan River has been generated. For model assessment, The comparison carried out in respect of different statistics of the historical data and synthetically generated data such as Basic Statistics like mean, standard deviation and skewness and series Persistence Statistics like autoregressives that finaly has shown model’s ability for Synthetic daily streamflow Generation. In this study, capability of Artificial Neural Network (ANN) models for synthetic streamflow generation is evaluated. The used generating model compouned from ANN model and a random component with normal distribution. In model developing, the multilayer feedforward neural networks and back propagation learning algorithm has been used. Then long term synthetic streamflow series up tp 300 years of daily streamflow, using only observed daily streamflow in Khersan River has been generated. For model assessment, The comparison carried out in respect of different statistics of the historical data and synthetically generated data such as Basic Statistics like mean, standard deviation and skewness and series Persistence Statistics like autoregressives that finaly has shown model’s ability for Synthetic daily streamflow Generation.

https://ceej.aut.ac.ir/article_326_a666587afda6e89aec274a3657558a27.pdf

Amirkabir University of Technology Amirkabir Journal of Civil Engineering 2588-297X 46 1 2014 09 23 Dynamic Analysis of Concrete Gravity Dams Including Dam-Foundation Rock Interaction Dynamic Analysis of Concrete Gravity Dams Including Dam-Foundation Rock Interaction 11 22 327 10.22060/ceej.2014.327 FA Hamid Reza Kazemi Nia Korrani M.Sc Student, Department of Civil & Environmental Engineering, Amirkabir University of Technology, Tehran Vahid Lotfi Professor, Department of Civil & Environmental Engineering, Amirkabir University of Technology, Tehran Journal Article 2010 02 27 Past studies have shown that dam-foundation rock interaction has significant effects on dynamic response of concrete dams. Moreover, several methods have been presented to investigate this subject such as, boundary element approach or the combination of boundary element and finite element procedures. Most of these methods are relatively complicated. Therefore, in the present study, a new computer program has been developed with a simplified approach. In this program, the dam body and foundation rock are modeled by three-dimensional finite element method. The results obtained by the present method (i.e., FE-FE approach) are very similar to the results published by previous complicated methods. Furthermore, this program is able to also utilize damping solvent extraction method. Therefore, the effects of damping solvent extracting on increasing convergence rate for dynamic response of concrete gravity dams has also been studied. Past studies have shown that dam-foundation rock interaction has significant effects on dynamic response of concrete dams. Moreover, several methods have been presented to investigate this subject such as, boundary element approach or the combination of boundary element and finite element procedures. Most of these methods are relatively complicated. Therefore, in the present study, a new computer program has been developed with a simplified approach. In this program, the dam body and foundation rock are modeled by three-dimensional finite element method. The results obtained by the present method (i.e., FE-FE approach) are very similar to the results published by previous complicated methods. Furthermore, this program is able to also utilize damping solvent extraction method. Therefore, the effects of damping solvent extracting on increasing convergence rate for dynamic response of concrete gravity dams has also been studied.

https://ceej.aut.ac.ir/article_327_b83aac23b9528732c23cc7352950e880.pdf

Amirkabir University of Technology Amirkabir Journal of Civil Engineering 2588-297X 46 1 2014 09 23 Deterministic analysis of strength and ductility of high-strength concrete columns Deterministic analysis of strength and ductility of high-strength concrete columns 23 38 328 10.22060/ceej.2014.328 FA Mohammadreza Esfahani Professor, Department of Civil Engineering, Ferdowsi University, Mashhad, Iran Seyed Mohammad Saberizadeh M.Sc Student, Department of Civil Engineering, Ferdowsi University, Mashhad, Iran Journal Article 2010 08 07 The study of stress-strain behavior of high strength concrete confined by transverse reinforcement has been widely considered by various researchers. As a result, various stress-strain relationships regarding columns made of high strength concrete have been presented. Since each suggested model is based on a limited number of experimental data of a researcher, it has often a good prediction on its experimental results but not on other data. In this study, all available models and experimental data presented by other researchers in the field of strength and ductility of columns made of high strength concrete have been collected. Based on the results of these studies and applying Operations Research(OR), an appropriate model is suggested. It is shown that the proposed model in comparison with other models has a very good agreement with experimental results, by using deterministic analysis. The study of stress-strain behavior of high strength concrete confined by transverse reinforcement has been widely considered by various researchers. As a result, various stress-strain relationships regarding columns made of high strength concrete have been presented. Since each suggested model is based on a limited number of experimental data of a researcher, it has often a good prediction on its experimental results but not on other data. In this study, all available models and experimental data presented by other researchers in the field of strength and ductility of columns made of high strength concrete have been collected. Based on the results of these studies and applying Operations Research(OR), an appropriate model is suggested. It is shown that the proposed model in comparison with other models has a very good agreement with experimental results, by using deterministic analysis.

https://ceej.aut.ac.ir/article_328_cd00692c3bfe59267d5ecfac5310286c.pdf

Amirkabir University of Technology Amirkabir Journal of Civil Engineering 2588-297X 46 1 2014 09 23 Study of Cyclic Behavior of Moment Connection of Beam to Built-up Box Column with Welded Flange Plates and Vertical Rib Plates Study of Cyclic Behavior of Moment Connection of Beam to Built-up Box Column with Welded Flange Plates and Vertical Rib Plates 39 48 329 10.22060/ceej.2014.329 FA Ardeshir Deylami Associate Professer, Department of Civil & Environmental Engineering, Amirkabir University of Technology, Tehran Alireza Tolou Kian M.Sc. Student, Department of Civil & Environmental Engineering, Amirkabir University of Technology, Tehran Journal Article 2011 03 05 This paper presents a study on moment connection of I-beam to built-up box column using flange plates. In this type of connection, the beam flanges are not connected to the column flange directly. The flange plates are fillet welded to the beam top and bottom flanges and CJP groove welded to the column flange. To investigate the cyclic behavior of the connection, nonlinear finite element program ABAQUS 6.8.1 is used. Results show that stress in the groove weld between beam flange plates and column flange is high which results in potential of brittle fracture and non-ductile behavior of the connection. To reduce the stress in the groove weld, single and double trapezoidal rib plates are installed on each beam flange plates. The rib plates are groove welded to the column flange and fillet welded to beam flange plates. Results of finite element analysis show that use of the rib plates although have no significant effect on global behavior of the connection but they result in reduction in the stress in the groove weld between beam flange plates and column flange. This paper presents a study on moment connection of I-beam to built-up box column using flange plates. In this type of connection, the beam flanges are not connected to the column flange directly. The flange plates are fillet welded to the beam top and bottom flanges and CJP groove welded to the column flange. To investigate the cyclic behavior of the connection, nonlinear finite element program ABAQUS 6.8.1 is used. Results show that stress in the groove weld between beam flange plates and column flange is high which results in potential of brittle fracture and non-ductile behavior of the connection. To reduce the stress in the groove weld, single and double trapezoidal rib plates are installed on each beam flange plates. The rib plates are groove welded to the column flange and fillet welded to beam flange plates. Results of finite element analysis show that use of the rib plates although have no significant effect on global behavior of the connection but they result in reduction in the stress in the groove weld between beam flange plates and column flange.

https://ceej.aut.ac.ir/article_329_6faa8040da20ef399b63a72d0e4ab575.pdf

Amirkabir University of Technology Amirkabir Journal of Civil Engineering 2588-297X 46 1 2014 09 23 Probabilistic Seismic-Hazard Analysis (PSHA) Considering Nonlinear Soil-Site Effects Probabilistic Seismic-Hazard Analysis (PSHA) Considering Nonlinear Soil-Site Effects 49 61 330 10.22060/ceej.2014.330 FA Saman Yaghmaei Sabegh Associate Professor, Department of Civil Engineering, Tabriz University, Tabriz, Iran Roya Motalebzadeh M.Sc. Student, Department of Civil Engineering, Tabriz University, Tabriz, Iran Journal Article 2011 08 01 Studies on the behavior of soil layers reflect the fact that the soil is generally enter the range of nonlinear behavior during strong ground motions that have received increased attention in recent years. Conventional seismic hazard analysis often assumes a linear behaviour for soil with considering of a generic-attenuation relation. Generally, for site response analysis, the amplification function is required that is depend on dynamic property of different soil layers, are not known for different parts of the world. This paper is aimed at presenting a straightforward approach for estimating seismic hazard curves taking into account nonlinear soil-site effects. This approach convolves numerically the probabilistic seismic hazard analysis (PSHA) at bedrock with the nonlinear response of soil computed via dynamic analysis. Applications of proposed method has been shown for two different sites located in Tehran and Tabriz, one sandy and one clayey. A Monte Carlo based approach was used for characterization of amplification function values along with those of deterministic curved obtained in the study areas. It is concluded that that the proposed model can give satisfactory accuracy for predicting seismic hazard curves when there is a lack of detailed information of dynamic soil properties. Studies on the behavior of soil layers reflect the fact that the soil is generally enter the range of nonlinear behavior during strong ground motions that have received increased attention in recent years. Conventional seismic hazard analysis often assumes a linear behaviour for soil with considering of a generic-attenuation relation. Generally, for site response analysis, the amplification function is required that is depend on dynamic property of different soil layers, are not known for different parts of the world. This paper is aimed at presenting a straightforward approach for estimating seismic hazard curves taking into account nonlinear soil-site effects. This approach convolves numerically the probabilistic seismic hazard analysis (PSHA) at bedrock with the nonlinear response of soil computed via dynamic analysis. Applications of proposed method has been shown for two different sites located in Tehran and Tabriz, one sandy and one clayey. A Monte Carlo based approach was used for characterization of amplification function values along with those of deterministic curved obtained in the study areas. It is concluded that that the proposed model can give satisfactory accuracy for predicting seismic hazard curves when there is a lack of detailed information of dynamic soil properties.

https://ceej.aut.ac.ir/article_330_fe73f687e5bc5280214e0486b273a5f9.pdf

Amirkabir University of Technology Amirkabir Journal of Civil Engineering 2588-297X 46 1 2014 09 23 Evaluation of Behavior Factor of Concrete Precast Frames with Concrete Precast Shear Wall Evaluation of Behavior Factor of Concrete Precast Frames with Concrete Precast Shear Wall 63 75 336 10.22060/ceej.2014.336 FA Morteza Madhkhan Associate Professor, Department of Civil Engineering, Isfahan University of Technology, Isfahan, Iran 0000-0001-7563-9165 Majid Divan M.Sc. Student, Department of Civil Engineering, Isfahan University of Technology, Isfahan, Iran Journal Article 2012 04 03 Although many researches have been conducted to investigate the behavior of concrete precast structures against seismic loadings, behavior factor of such structures, which is of significant importance in seismic design of structures, have received less attention so far. In this study, three typical concrete precast frames with precast shear walls, consist of 4, 8 and 12 stories with 3 and 5 bays have been investigated numerically to determine the behavior factors. Effects of two types of uniform and triangular loadings, vertical and horizontal connections between panels as well as pinned and fixed connections between beam and column have been investigated in this paper. To determine the behavior factor, nonlinear static (pushover) analysis approach has been used and Perform 3D software has been applied. Results showed that parameters such as uniform and triangular lateral loadings, pinned and fixed connections of beam-column as well as horizontal and vertical connections between panels have minor effects on the behavior factor. Moreover, increasing the number of spans with shear wall decreases the behavior factor. Increasing the number of stories, increases the behavior factor. The results obtained in the present work for 4 and 8 story frames compare well with those proposed in the seismic code 2800 and NEHRP 2003 Although many researches have been conducted to investigate the behavior of concrete precast structures against seismic loadings, behavior factor of such structures, which is of significant importance in seismic design of structures, have received less attention so far. In this study, three typical concrete precast frames with precast shear walls, consist of 4, 8 and 12 stories with 3 and 5 bays have been investigated numerically to determine the behavior factors. Effects of two types of uniform and triangular loadings, vertical and horizontal connections between panels as well as pinned and fixed connections between beam and column have been investigated in this paper. To determine the behavior factor, nonlinear static (pushover) analysis approach has been used and Perform 3D software has been applied. Results showed that parameters such as uniform and triangular lateral loadings, pinned and fixed connections of beam-column as well as horizontal and vertical connections between panels have minor effects on the behavior factor. Moreover, increasing the number of spans with shear wall decreases the behavior factor. Increasing the number of stories, increases the behavior factor. The results obtained in the present work for 4 and 8 story frames compare well with those proposed in the seismic code 2800 and NEHRP 2003

https://ceej.aut.ac.ir/article_336_6855456e2fe46a9d49d3d3af4f57443d.pdf

Amirkabir University of Technology Amirkabir Journal of Civil Engineering 2588-297X 46 1 2014 09 23 Assessing the solid waste management systems in the industrial state of Charmshahr & Salariyeh by using AHP & TBL Assessing the solid waste management systems in the industrial state of Charmshahr & Salariyeh by using AHP & TBL 77 90 331 10.22060/ceej.2014.331 FA Fereydoun Ghazban Professor, Department of Environmental Engineering, Tehran University, Tehran, Iran Hossein Vahidi PhD. Student, Department for Education, Culture and Research (ACECR) Tehran, Iran Seyed Masoud Tayefeh M.Sc. Student, Department of Environmental Engineering, University of Tehran, Aras International Campus, Iran Ali Ahmadzadeh M.Sc. Student, Department of Research & Technology, Pars Special Economic Energy Zone, NIOC, Iran Seyed Vahid Mosavi M.Sc. Student, Department of Research & Technology, Pars Special Economic Energy Zone, NIOC, Iran Journal Article 2012 04 08 Nowadays, in developing and under developing countries industries are developed rapidly. Ghathering various industries in one place has significant advantages such as better management, establishing essential foundations with lower costs, controlling the environmental pollutions and creating more competitions. On the other hand, the disadvantaged are generating various wastes in the high volumes. Therefore, the quantity and the quality of the Charmshahr & Salariyeh industrial state are assessed. This state has more than 200 active factories which lead to generate more than 21 thousand tons per year. Hence, AHP technique with the application of TBL method is conducted to choose the most proper solid waste management system for the state. Moreover, the sensitive analysis is conducted too. At end, recycling with the final weight of 0,325 is selected as the most proper scenario and incineration stands at the second place with the weight of 0.243. However, composting and landfilling are chosen as the next strategies with the weights of 0.238 and 0.194, respectively. Nowadays, in developing and under developing countries industries are developed rapidly. Ghathering various industries in one place has significant advantages such as better management, establishing essential foundations with lower costs, controlling the environmental pollutions and creating more competitions. On the other hand, the disadvantaged are generating various wastes in the high volumes. Therefore, the quantity and the quality of the Charmshahr & Salariyeh industrial state are assessed. This state has more than 200 active factories which lead to generate more than 21 thousand tons per year. Hence, AHP technique with the application of TBL method is conducted to choose the most proper solid waste management system for the state. Moreover, the sensitive analysis is conducted too. At end, recycling with the final weight of 0,325 is selected as the most proper scenario and incineration stands at the second place with the weight of 0.243. However, composting and landfilling are chosen as the next strategies with the weights of 0.238 and 0.194, respectively.

https://ceej.aut.ac.ir/article_331_6da37dd3139aa4d9aa55b8d237ec5d4a.pdf

Amirkabir University of Technology Amirkabir Journal of Civil Engineering 2588-297X 46 1 2014 08 23 A Comprehensive Cluster Map for Construction Cluster A Comprehensive Cluster Map for Construction Cluster 91 96 620 10.22060/ceej.2014.620 FA Mohammad Hasan Sebt Associate Professor, Department of Civil & Environmental Engineering, Amirkabir University of Technology, Tehran, Iran. Mahmood Mokhtariani M.Sc. Student, Department of Civil & Environmental Engineering, Amirkabir University of Technology, Tehran, Iran Journal Article 2010 02 09 Construction industry is one of the most important industries in the world that has significant role in development of countries. Therefore, in the recent decade, many countries accomplish extensive researches for growing their share in international market. One of the economic approaches, which considered for this reason in several industries in the recent years, is the industrial cluster. However, because of the unique nature of construction industry, many dimensions of this strategy within construction industry have not been clarified. One of these dimensions that have important role in comprehensive perception of industrial cluster approach in construction industry is the construction cluster map. In this article, a comprehensive map for construction cluster has established by use of grounded theory that illustrate vividly, the actors and activity that contribute to construction industry. Construction industry is one of the most important industries in the world that has significant role in development of countries. Therefore, in the recent decade, many countries accomplish extensive researches for growing their share in international market. One of the economic approaches, which considered for this reason in several industries in the recent years, is the industrial cluster. However, because of the unique nature of construction industry, many dimensions of this strategy within construction industry have not been clarified. One of these dimensions that have important role in comprehensive perception of industrial cluster approach in construction industry is the construction cluster map. In this article, a comprehensive map for construction cluster has established by use of grounded theory that illustrate vividly, the actors and activity that contribute to construction industry.

https://ceej.aut.ac.ir/article_620_b73dfe25b4b8714c029b37a6ad3006fa.pdf

Amirkabir University of Technology Amirkabir Journal of Civil Engineering 2588-297X 46 1 2014 09 23 E.M. Super Repair s’effect on the strength parameters of the collapsible soils E.M. Super Repair s’effect on the strength parameters of the collapsible soils 97 106 333 10.22060/ceej.2014.333 FA Sahel Sohrabi Shegefti M.Sc. Student, Department of Civil Engineering, Water Engineering, Shahid Chamran University, Ahwaz, Iran Habib Musavi Jahromi Professor, Department of Water Engineering, Shahid Chamran University, Ahwaz, Iran Journal Article 2011 07 13 There are some kinds of soils in nature which show a significant decrease in volume by increasing the humidity percentage under a fixed pressure.these solis are called collapsible soils. Collapsible soil shows a noticeable decrease in its volume with an increase in its moisture content under fixed stress. This decrease in volume causes irreversible damages to any structures on collapsible soil and the ones which are under construction. The study of the behavioral characteristics of collapsible soil and its stabilization is crucial. The main purpose of this study is stabilizing collapsible soil and increasing shear strength by adding E.M. Super Repair with different combinations. A sample was collected from Hamidiyeh region near Ahvaz. The primary geotechnical tests were done on the sample. Then shear strength parameters were determined by adding E.M. Super Repair with different combinations. The results show this substance improve the shear strength parameters. The most shear strength has been observed in 1% combination. There are some kinds of soils in nature which show a significant decrease in volume by increasing the humidity percentage under a fixed pressure.these solis are called collapsible soils. Collapsible soil shows a noticeable decrease in its volume with an increase in its moisture content under fixed stress. This decrease in volume causes irreversible damages to any structures on collapsible soil and the ones which are under construction. The study of the behavioral characteristics of collapsible soil and its stabilization is crucial. The main purpose of this study is stabilizing collapsible soil and increasing shear strength by adding E.M. Super Repair with different combinations. A sample was collected from Hamidiyeh region near Ahvaz. The primary geotechnical tests were done on the sample. Then shear strength parameters were determined by adding E.M. Super Repair with different combinations. The results show this substance improve the shear strength parameters. The most shear strength has been observed in 1% combination.

https://ceej.aut.ac.ir/article_333_310dcbbf4cce62f762a2aaa148d556bd.pdf

Amirkabir University of Technology Amirkabir Journal of Civil Engineering 2588-297X 46 1 2014 09 23 Laboratory studies to diagnosis problematic soils of Ardakan Laboratory studies to diagnosis problematic soils of Ardakan 107 115 334 10.22060/ceej.2014.334 FA Khadije Mahmoodi Lecturer, Faculty of Engineering, University of Yazd ardakan Hamid Mehrnahad Assistant Professor, Department of Civil Engineering, Yazd University Kazem Barkhordari Assistant Professor, Department of Civil Engineering, Yazd University Journal Article 2012 10 18 Ardakan is located in Iran’s central desert. Cracking has caused significant damage to buildings and arteries in this region. Different theories have been associated with the explanation of these cracks, the strongest of which is the problematic soils (expansive soils, dispersive soils and collapsible soils). In this respect several geotechnical tests performed on five bores up to 14 meters in depth. To determine the swelling potential of soil, direct (standard A methods of ASTM D4546) and indirect (various criteria including Chen, AASHTO, Kaldveer, Vander Merwe and free swell test) methods were used. It was concluded that soils have moderate swelling potential. This feature in some cases can cause cracks in the structures. It has also been concluded that the dispersion and collapse potential of soil are negligible. Ardakan is located in Iran’s central desert. Cracking has caused significant damage to buildings and arteries in this region. Different theories have been associated with the explanation of these cracks, the strongest of which is the problematic soils (expansive soils, dispersive soils and collapsible soils). In this respect several geotechnical tests performed on five bores up to 14 meters in depth. To determine the swelling potential of soil, direct (standard A methods of ASTM D4546) and indirect (various criteria including Chen, AASHTO, Kaldveer, Vander Merwe and free swell test) methods were used. It was concluded that soils have moderate swelling potential. This feature in some cases can cause cracks in the structures. It has also been concluded that the dispersion and collapse potential of soil are negligible.

https://ceej.aut.ac.ir/article_334_2f2b265625d76a6704b08093c652fd79.pdf

Amirkabir University of Technology Amirkabir Journal of Civil Engineering 2588-297X 46 1 2014 09 23 Scale Effect Aspects for Correlation CPT Data in Foundation Analysis and Design Scale Effect Aspects for Correlation CPT Data in Foundation Analysis and Design 117 130 335 10.22060/ceej.2014.335 FA Abolfazl Eslami Associate Professor, Department of Civil & Environmental Engineering, Amirkabir University of Technology Mehran Ziaabadi Graduated in Civil & Environmental Engineering, AmirKabir University of Technology Mohsen Tamimi Graduated in Civil & Environmental Engineering, Islamic Azad University of Tehran Samieh Rezazadeh M.Sc. Student, Department of Civil & Environmental Engineering, Guilan University Journal Article 2012 06 26 The cone penetration test (CPT) is the most applicable In-situ tests in geotechnical practice, because it is simple, fast, reliable, and economical nature. The scale effects between the pile toe resistance and CPT cone is studied by different researchers, so the effects of these factors are not taken in creating a relation between CPT sleeve friction and pile shaft resistance. The main purpose of this research is studying these effects on shaft resistance . The shear strain due to CPTsounding and pile load tests were studied and the scale effect aspects between CPT and pile related to the shear strain levels. Excess pore pressure effects in fine grained soils generated due to rate of penetration was individually considered. Database consists of 42case histories of pile load tests including the CPT profile, derived from different sites have been used to evaluation of the current approaches. In this paper the proposed method for determining the shaft bearing capacity, with considering scale effects was evaluated and compaired with four methods including: Clisby et al 1978.,Tumay and Fakhroo 1981, Price and Wardle 1982, and Takesue et al 1998.The results of analysis by proposed method demonstrate good accuracy in comparison with the other methods for estimating the shaft capacity. The cone penetration test (CPT) is the most applicable In-situ tests in geotechnical practice, because it is simple, fast, reliable, and economical nature. The scale effects between the pile toe resistance and CPT cone is studied by different researchers, so the effects of these factors are not taken in creating a relation between CPT sleeve friction and pile shaft resistance. The main purpose of this research is studying these effects on shaft resistance . The shear strain due to CPTsounding and pile load tests were studied and the scale effect aspects between CPT and pile related to the shear strain levels. Excess pore pressure effects in fine grained soils generated due to rate of penetration was individually considered. Database consists of 42case histories of pile load tests including the CPT profile, derived from different sites have been used to evaluation of the current approaches. In this paper the proposed method for determining the shaft bearing capacity, with considering scale effects was evaluated and compaired with four methods including: Clisby et al 1978.,Tumay and Fakhroo 1981, Price and Wardle 1982, and Takesue et al 1998.The results of analysis by proposed method demonstrate good accuracy in comparison with the other methods for estimating the shaft capacity.

https://ceej.aut.ac.ir/article_335_f9b902fc3289af4dd08de5d1de54f68f.pdf