Synthetic Streamflow Generation using Artificial Neural Network Models
Mostafa
Yeganehfard
M.Sc. Department of Civil & Environmental Engineering, Iran University of Science and Technology, Tehran, Iran
author
bagher
zahabioun
Associate Professor, Department of Civil & Environmental Engineering, Iran University of Science & Technology, Tehran, Iran
author
text
article
2014
per
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.
Amirkabir Journal of Civil Engineering
Amirkabir University of Technology
2588-297X
46
v.
1
no.
2014
1
10
https://ceej.aut.ac.ir/article_326_6f9d205b2d2953ad745953558118f028.pdf
dx.doi.org/10.22060/ceej.2014.326
Dynamic Analysis of Concrete Gravity Dams Including Dam-Foundation Rock Interaction
Hamid reza
Kazemi nia korrani
M.Sc Student, Department of Civil & Environmental Engineering, Amirkabir University of Technology, Tehran
author
Vahid
Lotfi
Professor, Department of Civil & Environmental Engineering, Amirkabir University of Technology, Tehran
author
text
article
2014
per
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.
Amirkabir Journal of Civil Engineering
Amirkabir University of Technology
2588-297X
46
v.
1
no.
2014
11
22
https://ceej.aut.ac.ir/article_327_5af4390fdafd5c2215543f2fa0b3d794.pdf
dx.doi.org/10.22060/ceej.2014.327
Deterministic analysis of strength and ductility of high-strength concrete columns
Mohammadreza
Esfahani
Professor, Department of Civil Engineering, Ferdowsi University, Mashhad, Iran
author
seyed mohammad
saberizadeh
M.Sc Student, Department of Civil Engineering, Ferdowsi University, Mashhad, Iran
author
text
article
2014
per
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.
Amirkabir Journal of Civil Engineering
Amirkabir University of Technology
2588-297X
46
v.
1
no.
2014
23
38
https://ceej.aut.ac.ir/article_328_8e1d3d0b230296cc84d957759d3a2d8f.pdf
dx.doi.org/10.22060/ceej.2014.328
Study of Cyclic Behavior of Moment Connection of Beam to Built-up Box Column with Welded Flange Plates and Vertical Rib Plates
ardeshir
deylami
Associate Professer, Department of Civil & Environmental Engineering, Amirkabir University of Technology, Tehran
author
Alireza
Tolou Kian
M.Sc. Student, Department of Civil & Environmental Engineering, Amirkabir University of Technology, Tehran
author
text
article
2014
per
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.
Amirkabir Journal of Civil Engineering
Amirkabir University of Technology
2588-297X
46
v.
1
no.
2014
39
48
https://ceej.aut.ac.ir/article_329_0e1001d5add4a39783eec67eb3b08b6b.pdf
dx.doi.org/10.22060/ceej.2014.329
Probabilistic Seismic-Hazard Analysis (PSHA)
Considering Nonlinear Soil-Site Effects
Saman
Yaghmaei Sabegh
Associate Professor, Department of Civil Engineering, Tabriz University, Tabriz, Iran
author
Roya
Motalebzadeh
M.Sc. Student, Department of Civil Engineering, Tabriz University, Tabriz, Iran
author
text
article
2014
per
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.
Amirkabir Journal of Civil Engineering
Amirkabir University of Technology
2588-297X
46
v.
1
no.
2014
49
61
https://ceej.aut.ac.ir/article_330_668071d47cd31df92d7ea3f693738bc7.pdf
dx.doi.org/10.22060/ceej.2014.330
Evaluation of Behavior Factor of Concrete Precast Frames with Concrete Precast Shear Wall
Morteza
Madhkhan
Associate Professor, Department of Civil Engineering, Isfahan University of Technology, Isfahan, Iran
author
Majid
Divan
M.Sc. Student, Department of Civil Engineering, Isfahan University of Technology, Isfahan, Iran
author
text
article
2014
per
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
Amirkabir Journal of Civil Engineering
Amirkabir University of Technology
2588-297X
46
v.
1
no.
2014
63
75
https://ceej.aut.ac.ir/article_336_c89c2ef027995aee312bc99833ce09f6.pdf
dx.doi.org/10.22060/ceej.2014.336
Assessing the solid waste management systems in the industrial state of Charmshahr & Salariyeh by using AHP & TBL
Fereydoun
Ghazban
Professor, Department of Environmental Engineering, Tehran University, Tehran, Iran
author
Hossein
Vahidi
PhD. Student, Department for Education, Culture and Research (ACECR) Tehran, Iran
author
Seyed Masoud
tayefeh
M.Sc. Student, Department of Environmental Engineering, University of Tehran, Aras International Campus, Iran
author
Ali
Ahmadzadeh
M.Sc. Student, Department of Research & Technology, Pars Special Economic Energy Zone, NIOC, Iran
author
Seyed Vahid
Mosavi
M.Sc. Student, Department of Research & Technology, Pars Special Economic Energy Zone, NIOC, Iran
author
text
article
2014
per
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.
Amirkabir Journal of Civil Engineering
Amirkabir University of Technology
2588-297X
46
v.
1
no.
2014
77
90
https://ceej.aut.ac.ir/article_331_cda977c6213c945227707d9e1284839f.pdf
dx.doi.org/10.22060/ceej.2014.331
A Comprehensive Cluster Map for Construction Cluster
Mohammad Hasan
Sebt
Associate Professor, Department of Civil & Environmental Engineering, Amirkabir University of Technology, Tehran, Iran.
author
mahmood
mokhtariani
M.Sc. Student, Department of Civil & Environmental Engineering, Amirkabir University of Technology, Tehran, Iran
author
text
article
2014
per
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.
Amirkabir Journal of Civil Engineering
Amirkabir University of Technology
2588-297X
46
v.
1
no.
2014
91
96
https://ceej.aut.ac.ir/article_620_38aac2397a2e773ac65fb163e4d77222.pdf
dx.doi.org/10.22060/ceej.2014.620
E.M. Super Repair s’effect on the strength parameters of the collapsible soils
sahel
sohrabi shegefti
M.Sc. Student, Department of Civil Engineering, Water Engineering, Shahid Chamran University, Ahwaz, Iran
author
habib
musavi jahromi
Professor, Department of Water Engineering, Shahid Chamran University, Ahwaz, Iran
author
text
article
2014
per
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.
Amirkabir Journal of Civil Engineering
Amirkabir University of Technology
2588-297X
46
v.
1
no.
2014
97
106
https://ceej.aut.ac.ir/article_333_fea790f640a305e0316eedbe87729013.pdf
dx.doi.org/10.22060/ceej.2014.333
Laboratory studies to diagnosis problematic soils of Ardakan
khadije
mahmoodi
Lecturer, Faculty of Engineering, University of Yazd ardakan
author
hamid
mehrnahad
Assistant Professor, Department of Civil Engineering, Yazd University
author
kazem
barkhordari
Assistant Professor, Department of Civil Engineering, Yazd University
author
text
article
2014
per
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.
Amirkabir Journal of Civil Engineering
Amirkabir University of Technology
2588-297X
46
v.
1
no.
2014
107
115
https://ceej.aut.ac.ir/article_334_6b8b0d8ac9dcdf486d5ebeb85b32a905.pdf
dx.doi.org/10.22060/ceej.2014.334
Scale Effect Aspects for Correlation CPT Data in Foundation Analysis and Design
Abolfazl
Eslami
Associate Professor, Department of Civil & Environmental Engineering, Amirkabir University of Technology
author
Mehran
Ziaabadi
Graduated in Civil & Environmental Engineering, AmirKabir University of Technology
author
Mohsen
Tamimi
Graduated in Civil & Environmental Engineering, Islamic Azad University of Tehran
author
Samieh
Rezazadeh
M.Sc. Student, Department of Civil & Environmental Engineering, Guilan University
author
text
article
2014
per
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.
Amirkabir Journal of Civil Engineering
Amirkabir University of Technology
2588-297X
46
v.
1
no.
2014
117
130
https://ceej.aut.ac.ir/article_335_afced7a3fd498e14911bb76a708f3bae.pdf
dx.doi.org/10.22060/ceej.2014.335