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دانلود مقالات انگلیسی در زمینه مهندسی باد و زلزله رفتن به صفحه قبلی  1, 2, 3, 4, 5  بعدی
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پست تاریخ: پنج‌شنبه 4 تیر 1394 - 22:32    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Response of buildings with inclined first-story columns to near-fault ground motion
Article 2, Volume 2, Issue 1, Winter 2014, Page 19-34 XML PDF (854 K)
Authors
1Fouzieh Rouzmehr; 2Reza Saleh Jalali*
1MS Student, Dept. of Civil Eng., Faculty of Eng., University of Guilan, Rasht, Iran
2Assistant Prof., Dept. of Civil Eng., Faculty of Eng., University of Guilan, Rasht, Iran
Abstract
In this paper a simple model of a three story building with inclined first-story columns has presented. The stories are supposed to be rigid and are connected to axially rigid mass less columns by elasto-plastic rotational springs and linear rotational dampers. The considered model is subjected to horizontal component of fault normal pulse with different magnitudes and the governed nonlinear differential equations of motion have been solved by the forth order Runge-Kutta method. Results indicate that the inclination of the first-story columns stiffens the system. However, the change of the frequency of the first mode is small. The deformation of the first story with inclined columns is such that it forces the building in a pendulum-like motion. So it would be possible to reduce the relative building response. Results indicate that an optimum value of inclination angle of the first-story columns is . Under this condition the first-story drift decreases while upper-story drift increases, respect to the common building. For larger inclination angles the gravity effect leads to increase the first-story drift as well. This solution would be useful in earthquake resistant design of buildings which have architectural limitations at the first story.
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پست تاریخ: پنج‌شنبه 4 تیر 1394 - 22:40    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

COMPARATIVE REVIEW OF THE PERFORMANCE BASED DESIGN OF BUILDING STRUCTURES USING STATIC NON-LINEAR ANALYSIS, PART B: R/C FRAMES
Article 6, Volume 2, Issue 1, Winter 2014, Page 75-92 XML PDF (1354 K)
Authors
1R. C. Barros; 2M. T. Braz-César; Hosein Naderpour ; S.M. Khatami
1Associate Professor, Faculty of Engineering, University of Porto (FEUP), Porto, Portugal
2Ph.D. Student, Faculty of Engineering, University of Porto (FEUP), Porto, Portugal
Abstract
The objective of this review to be submitted in two independent parts, for steel frames and for RC frames, is to compare their structural performance with respect to the proposed N2-method, and so also of the consequent convenience of using pushover methodology for the seismic analysis of these structures. A preliminary investigation is presented on a pushover analysis used for the seismic performance of metallic braced frames equipped with diagonal X-bracing and K-bracing systems. Three steel frames are analysed corresponding to 3, 6 and 10 floor regular buildings that were modelled in the MIDAS/Civil finite element software. To obtain the pushover curve a non-linear static methodology is used. For the RC frames three commercial programs (SAP 2000, SeismoStruck and MIDAS/Civil) are used in order to perform a parametric study based on pushover analyses. The equivalent strut method is applied to simulate the influence of the masonry infill panels; to evaluate the influence of these on the capacity curves, several strut width values are considered. The parametric study also addresses the influence of other parameters on the structural behaviour and non-linear capacity curves of the RC frame, namely: length and position of the plastic hinges and different loading patterns (uniform, modal and triangular distributions).
Reference
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عضو شده در: 7 مهر 1385
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امتیاز: 210699
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پست تاریخ: پنج‌شنبه 4 تیر 1394 - 22:48    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Probabilistic Assessment of Earthquake Damage and Loss for the City of Tehran, Iran
Article 2, Volume 1, Issue 2, Summer 2013, Page 10-23 XML PDF (1432 K)
Authors
1G. Ghodrati Amiri; 2N. Khoshnevis ; 3S.A. Razavian Amrei
1Professor, Center of Excellence for Fundamental Studies in Structural Engineering, College of Civil Engineering, Iran University of Science & Technology, Postal Code: 16846-13114, Tehran, Iran
2College of Civil Engineering, Iran University of Science & Technology, Narmak, Tehran 16846, Iran
3Assistant Professor, Department of Civil Engineering, Payame Noor University, Tehran, Iran
Abstract
Tehran is one of the densely populated metropolises located in earthquake-prone regions. Tehran, the population of which surpasses 8 million people, is the most populated area in Iran. There are historical evidences confirming that catastrophic earthquakes have destroyed the city in past years. In the present paper, our study covers all parts of Tehran because there is the potential of significant earthquake damage and loss for the entire city. In other words, the development of high-rise building construction in the northern part, the high density of population in the southern area including old masonry buildings, and the existence of important structures in central regions, prevent us from omitting any particular part of the city from damage assessment process. We have used two sets of last available formal data published in 1996 and 2006. To consider the influence of soil conditions, Tehran has been divided into 1246 sub regions; however, in our study the results have been presented using municipality regions and in cumulative manner. Since there is no acceptable statistical data involving estimation of non-structural damage, only structural damages have been assessed. The open source software SELENA is applied to perform probabilistic loss estimates. Due to the lack of studies providing required information from structural point of view in our country, and the existence of similarity between structural codes of Iran and that of United States, HAZUS-MH (Hazard Us – Multi Hazard Loss) structures coefficients are used. According to the results, from 1996 to 2006, the mean damage ratio and number of casualties have been reduced, while the economic loss has been increased.
Keywords
Seismic damage; Loss assessment; HAZUS; Tehran; Iran
Reference
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عضو شده در: 7 مهر 1385
پست: 37412

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امتیاز: 210699
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پست تاریخ: پنج‌شنبه 4 تیر 1394 - 22:49    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Comparative Review of the Performance Based Design of Building Structures Using Static Non-Linear Analysis, Part A: Steel Braced Frames
Article 3, Volume 1, Issue 2, Summer 2013, Page 24-39 XML PDF (696 K)
Authors
1R. C. Barros; 2M. T. Braz-César; 3H. Naderpour ; 4S.M. Khatami
1Associate Professor, Faculty of Engineering, University of Porto (FEUP), Porto, Portugal
2Ph.D. Student, Faculty of Engineering, University of Porto (FEUP), Porto, Portugal
3Assistant Professor, Faculty of Civil Engineering, Semnan University, Semnan, Iran
4Ph.D. Student, Faculty of Civil Engineering, Semnan University, Semnan, Iran
Abstract
The objective of this review to be submitted in two independent parts, for steel frames and for RC frames, is to compare their structural performance with respect to the proposed N2-method, and so also of the consequent convenience of using pushover methodology for the seismic analysis of these structures. A preliminary investigation is presented on a pushover analysis used for the seismic performance of metallic braced frames equipped with diagonal X-bracing and K-bracing systems. Three steel frames are analysed corresponding to 3, 6 and 10 floor regular buildings that were modelled in the MIDAS/Civil finite element software. To obtain the pushover curve a non-linear static methodology is used. For the RC frames three commercial programs (SAP 2000, SeismoStruck and MIDAS/Civil) are used in order to perform a parametric study based on pushover analyses. The equivalent strut method is applied to simulate the influence of the masonry infill panels; to evaluate the influence of these on the capacity curves, several strut width values are considered. The parametric study also addresses the influence of other parameters on the structural behaviour and non-linear capacity curves of the RC frame, namely: length and position of the plastic hinges and different loading patterns (uniform, modal and triangular distributions).
Keywords
Performance based design; Static non-linear analysis; Pushover; Bracing system; Dynamic analysis
Reference
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عضو شده در: 7 مهر 1385
پست: 37412

تشکر: 3350
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امتیاز: 210699
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پست تاریخ: پنج‌شنبه 4 تیر 1394 - 22:52    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Seismic Performance of RC Frames Irregular in Elevation Designed Based on Iranian Seismic Code
Article 4, Volume 1, Issue 2, Summer 2013, Page 40-55 XML PDF (1455 K)
Authors
1A. Habibi ; 2K. Asadi
1Assistant Professor, Department of Civil Engineering, University of Kurdistan, Iran
2M.Sc., Student of Civil Engineering, University of Kurdistan, Iran
Abstract
Setback in elevation of a structure is a special irregularity with considerable effect on its seismic performance. This paper addresses multistory Reinforced Concrete (RC) frame buildings, regular and irregular in elevation. Several multistory Reinforced Concrete Moment Resisting Frames (RCMRFs) with different types of setbacks, as well as the regular frames in elevation, are designed according to the provisions of the Iranian national building code and Iranian seismic code for the high ductility class. Inelastic dynamic time-history analysis is performed on all frames subjected to ten input motions. The assessment of the seismic performance is done based on both global and local criteria. Results show that when setback occurs in elevation, the requirements of the life safety level are not satisfied. It is also shown that the elements near the setback experience the maximum damage. Therefore it is necessary to strengthen these elements by appropriate method to satisfy the life safety level of the frames.
Keywords
RC buildings; Irregularity in elevation; Setbacks; Seismic Performance; Time-history analysis; Standard 2800
Reference
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عضو شده در: 7 مهر 1385
پست: 37412

تشکر: 3350
تشکر شده 18464 بار در 8609 پست

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امتیاز: 210699
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پست تاریخ: پنج‌شنبه 4 تیر 1394 - 23:00    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Seismic Behavior Assessment of Concrete Elevated Water Tanks
Article 6, Volume 1, Issue 2, Summer 2013, Page 69-79 XML PDF (1000 K)
Authors
1S. Bozorgmehrnia ; 2M.M. Ranjbar; 2R. Madandoust
1M.Sc., Civil Engineering Department, Guilan University, Rasht, Iran
2Ph.D., Civil Engineering Department, Guilan University, Rasht, Iran
Abstract
Elevated tanks are very important structures and consist of various types. Water supply is vital to control fires during earthquakes. Also they are utilized to store different products, like petroleum supplies in cities and industrial zones. Damage to these structures during strong ground motions may lead to fire or other hazardous events. Elevated tanks should stay functional after and before earthquakes. However their dynamic behavior differs greatly in comparison with other structures. In this research, a sample of reinforced concrete elevated water tank, with 900 cubic meters capacity, exposed to three pair of earthquake records have been studied and analyzed in time history using mechanical and finite-element modeling technique. The liquid mass of tank is modeled as lumped masses known as sloshing mass, or impulsive mass. The corresponding stiffness constants associated with these lumped masses have been worked out depending upon the properties of the tank wall and liquid mass. Tank responses including base shear, overturning moment, tank displacement, and sloshing displacement have been calculated. Results reveal that the system responses are highly influenced by the structural parameters and the earthquake characteristics such as frequency content.
Keywords
Elevated water tank; Seismic behavior; Ensemble earthquake records; Base shear; Overturning moment; Sloshing displacement
Reference
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عضو شده در: 7 مهر 1385
پست: 37412

تشکر: 3350
تشکر شده 18464 بار در 8609 پست

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امتیاز: 210699
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پست تاریخ: پنج‌شنبه 4 تیر 1394 - 23:06    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Earthquake Vulnerability and Seismic Risk Assessment of Bandar Abbas in South of Iran
Article 1, Volume 1, Issue 1, Winter 2013, Page 1-14 XML PDF (1898 K)
Document Type: Regular Paper
Authors
1A.A. Fatemi; 2Z. Tabrizian; 3G. Ghodrati Amiri ; 4S.A. Razavian Amrei
1Ph.D., Faculty Staff, Islamic Azad University, Pardis Branch, Postal Code: 135-16555, Pardis new city, Tehran, Iran
2Ph.D. Candidate, College of Civil Engineering, Babol Noshirvani University of Technology, Postal Code: 47148-71167, Babol, Iran
3Professor, Center of Excellence for Fundamental Studies in Structural Engineering, School of Civil Engineering, Iran University of Science & Technology, Postal Code: 16846-13114, Tehran, Iran
4Assistant Professor, Department of Civil Engineering, Payame Noor University, Tehran, Iran
Abstract
Bandar Abbas (center of Hormozgan province) is the most important port city in the south of Iran because of its historical places, cultural, economic, social and political importance. High risk of earthquake occurrence in this city and its province indicates the necessity of surveying the seismic vulnerability of buildings. The object of this paper is collected from existing Buildings, compiled by aggregating data from sidewalk surveys and other observations. Estimated loss distributions and damage were mapped on area by area. Seismic hazard in the area was obtained using the seismic source zones for a probability level of 10 percent occurrence in 50 years. Finally value of vulnerability was mapped on seismic zones in each area. The older areas of the cities are expected to suffer the highest amount of damage and the highest seismic hazard occurs in these areas as well. We can realize the general vulnerability of the city.
Keywords
Seismic risk assessment; Seismic vulnerability; Bandar Abbas; Iran
Reference
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عضو شده در: 7 مهر 1385
پست: 37412

تشکر: 3350
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امتیاز: 210699
[وضعيت كاربر:آفلاین]

پست تاریخ: پنج‌شنبه 4 تیر 1394 - 23:13    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Influence of Seismic Pounding on RC Buildings with and without Base Isolation System Subject to Near-Fault Ground Motions
Article 4, Volume 1, Issue 1, Winter 2013, Page 39-52 XML PDF (591 K)
Document Type: Regular Paper
Authors
1Rui C. Barros; 2H. Naderpour ; 3S.M. Khatami; 4A. Mortezaei
1Associate Professor, Faculty of Engineering, University of Porto (FEUP), Porto, Portugal
2Assistant Professor, Faculty of Civil Engineering, Semnan University, Semnan, Iran
3Ph.D. Student, Faculty of Civil Engineering, Semnan University, Semnan, Iran
4Assistant Professor, Faculty of Engineering, Semnan Branch, Islamic Azad University, Semnan, Iran
Abstract
Building pounding occurs between two adjacent buildings with small gap or without sufficient separation distance. It leads to damage buildings during earthquake due to impact. Many researchers have investigated building pounding based on impact force reduction and energy dissipation increase, when two buildings collide with each other. In numerical investigations, using specific link element, impact force is calculated in order to get the proper evaluation of damage for preventing failure of structural elements. In this paper, focusing on numerical investigation, the effectiveness of impact and energy dissipation is studied. For this challenge, two RC structural models are considered to evaluate the pounding to calculate the impact force and finally, to compare the effectiveness of Base Isolation (BI) support against fixed support. A link element is located at the connection level between two studied dynamic models.
Keywords
Pounding; Fixed base; Base isolation; RC building; Collision; Mathematical formulation
Reference
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عضو شده در: 7 مهر 1385
پست: 37412

تشکر: 3350
تشکر شده 18464 بار در 8609 پست

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امتیاز: 210699
[وضعيت كاربر:آفلاین]

پست تاریخ: پنج‌شنبه 4 تیر 1394 - 23:18    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Evaluating Equivalent Damping and Response Modification Factors of Frames Equipped by Pall Friction Dampers
Article 7, Volume 1, Issue 1, Winter 2013, Page 78-92 XML PDF (463 K)
Document Type: Regular Paper
Authors
1M. Mahmoudi ; 2A. Mirzaei; 3S. Vosough
1Assistant Professor, Department of Civil Engineering, Shahid Rajai Teacher Training University, Tehran, Iran
2M.Sc. Student, Department of Civil Engineering, Shahid Rajai Teacher Training University, Tehran, Iran
3Department of Civil Engineering, Shahid Rajai Teacher Training University, Tehran, Iran
Abstract
A study on the evaluating equivalent damping and response modification factors of frames equipped by Pall Friction Dampers is presented. To do so, buildings with various stories were considered. Nonlinear and linear dynamic time history analysis has been performed to evaluate equivalent damping for Pall Friction Dampers. Ground motions with various frequency characteristics scaled with Iranian earthquake resistant design code. In addition, nonlinear incremental dynamic analysis has been performed to evaluate the response modification factors. In this article, equivalent damping and seismic response modification factor for moment resisting frames with and without Pall Friction Dampers have been determined separately. The governing parameters were identified and their influence was traced and summarized along with implications for practical design. The results show that the equivalent damping of these frames using damper is higher than frames without it. Also we have this result for the response modification factors. It was also found that the number of stories have a great effect on these two characteristics of the buildings.
Keywords
equivalent damping; response modification factors; Pall Friction Dampers
Reference
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عضو شده در: 7 مهر 1385
پست: 37412

تشکر: 3350
تشکر شده 18464 بار در 8609 پست

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امتیاز: 210699
[وضعيت كاربر:آفلاین]

پست تاریخ: شنبه 13 تیر 1394 - 12:31    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

A Seismic Design Lateral Force Distribution Based on Inelastic State of Structures
Shih-Ho Chao,a)
M.EERI, Subhash C. Goel,b)
M.EERI, and Soon-Sik Leec)
It is well recognized that structures designed by current codes undergo
large inelastic deformations during major earthquakes. However, lateral force
distributions given in the seismic design codes are typically based on results of
elastic-response studies. In this paper, lateral force distributions used in the
current seismic codes are reviewed and the results obtained from nonlinear
dynamic analyses of a number of example structures are presented and
discussed. It is concluded that code lateral force distributions do not represent
the maximum force distributions that may be induced during nonlinear
response, which may lead to inaccurate predictions of deformation and force
demands, causing structures to behave in a rather unpredictable and
undesirable manner.A new lateral force distribution based on study of inelastic
behavior is developed by using relative distribution of maximum story shears
of the example structures subjected to a wide variety of earthquake ground
motions. The results show that the suggested lateral force distribution,
especially for the types of framed structures investigated in this study, is more
rational and gives a much better prediction of inelastic seismic demands at
global as well as at element levels. DOI: 10.1193/1.2753549

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