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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: دوشنبه 15 تیر 1394 - 02:32    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Seismic Fragility Assessment of Special Truss Moment Frames (STMF) Using the Capacity Spectrum Method
Article 1, Volume 48, Issue 1, June 2015, Page 1-8 XML PDF (847 K)
Document Type: Research Paper
Authors
1 Gholamreza Abdollahzadeh ; 2 Mohammad Sazjini; 2 Azadossadate Asghari
1Associate Professor, Faculty of Civil Engineering, Babol University of Technology
2Ph.D. Student, Faculty of Civil Engineering, Babol University of Technology
Abstract
Fragility curves represent the probabilities that structural damages, under various levels of seismic excitation, will exceed the specified damage states by means of earthquake intensity damage relations. Conceptual aspects related to seismic vulnerability, damage and risk evaluation are discussed first, together with a short review of the most widely used possibilities for the seismic evaluation of structures. The capacity spectrum method starting from capacity and fragility curves is then discussed. The determination of capacity curves for buildings using a non-linear structural analysis tools is then explained, together with a simplified expeditious procedure allowing the development of fragility curves. Next, the seismic risk of the special truss moment frame (STMF) systems of Tehran, the capital of Iran, is analysed in this paper using the capacity spectrum method. The seismic hazard of the studied area is described by using the reduced 5%-damped elastic response spectra. Significant damage is obtained for mid-rise and high-rise special truss moment frames with a Vierendeel middle panel, because of the buckling and early fracture of truss web members. Special truss moment frames with an X-diagonal middle segment also show a low seismic capacity leading to significant expected damage.
Keywords
Capacity Spectrum; Damage Evaluation; Fragility Curve; Seismic Risk; Seismic Vulnerability; Special Truss Moment Frame
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پست تاریخ: دوشنبه 15 تیر 1394 - 02:40    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Seismic Performance Reliability of RC Structures: Application of Response Surface Method and Systemic Approach
Article 5, Volume 48, Issue 1, June 2015, Page 47-68 XML PDF (1192 K)
Document Type: Research Paper
Authors
1 Hossein Shahraki ; 2 Naser Shabakhty
1Ph.D. Candidate, Department of Civil Engineering, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran
2Assisstant Professor, Department of Civil Engineering, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran
Abstract
The present study presents an algorithm that models uncertainties at the structural component level to estimate the performance reliability of RC structures. The method calculates the performance reliability using a systemic approach and incorporates the improved response surface method based on sampling blocks using the first-order reliability method and conditional reliability indices. The results of the proposed method at different performance levels were compared to bound techniques and the overall approach. It was shown that the proposed algorithm appropriately estimates the reliability of the seismic performance of RC structures at different damage levels for the structural components. The results indicated that performance reliability indices increased when then on-performance scenarios were examined for high levels of components damage.
Keywords
RC Structures; Reliability; Response Surface Method; Seismic Performance; Systemic Approach
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پست تاریخ: دوشنبه 15 تیر 1394 - 02:44    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Optimum Parameters for Tuned Mass Damper Using Shuffled Complex Evolution (SCE) Algorithm
Article 7, Volume 48, Issue 1, June 2015, Page 83-100 XML PDF (1116 K)
Document Type: Research Paper
Authors
1 Hessamoddin Meshkat Razavi ; 2 Hashem Shariatmadar
1Ph.D. Candidate, Department of Civil Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
2Associated Professor, Department of Civil Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
Abstract
This study is investigated the optimum parameters for a tuned mass damper (TMD) under the seismic excitation. Shuffled complex evolution (SCE) is a meta-heuristic optimization method which is used to find the optimum damping and tuning frequency ratio for a TMD. The efficiency of the TMD is evaluated by decreasing the structural displacement dynamic magnification factor (DDMF) and acceleration dynamic magnification factor (ADMF) for a specific vibration mode of the structure. The optimum TMD parameters and the corresponding optimized DDMF and ADMF are achieved for two control levels (displacement control and acceleration control), different structural damping ratio and mass ratio of the TMD system. The optimum TMD parameters are checked for a 10-storey building under earthquake excitations. The maximum storey displacement and acceleration obtained by SCE method are compared with the results of other existing approaches. The results show that the peak building response decreased with decreases of about 20% for displacement and 30% for acceleration of the top floor. To show the efficiency of the adopted algorithm (SCE), a comparison is also made between SCE and other meta-heuristic optimization methods such as genetic algorithm (GA), particle swarm optimization (PSO) method and harmony search (HS) algorithm in terms of success rate and computational processing time. The results show that the proposed algorithm outperforms other meta-heuristic optimization methods.
Keywords
Dynamic Magnification Factors; Earthquake Excitation; Response Reduction; Shuffled Complex Evolution (SCE); Tuned Mass Damper (TMD)
Reference
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امتیاز: 210699
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پست تاریخ: دوشنبه 15 تیر 1394 - 02:46    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Modification of Displacement Coefficient Method in Estimation of Target Displacement for Regular Concrete Bridges Based on ASCE 41-06 Standard
Article 8, Volume 48, Issue 1, June 2015, Page 101-120 XML PDF (704 K)
Document Type: Research Paper
Authors
1 Seyed Bahram Beheshti-Aval ; 2 Ehsan Jahanfekr
1Associate Professor, Civil Engineering Faculty, K.N. Toosi University of Technology, Tehran, Iran
2Ph.D. Candidate, Faculty of Technical and Engineering, Hormozgan University, Bandarabas, Iran
Abstract
Displacement Coefficient Method (DCM) stipulated in the ASCE 41-06 standard is becoming the preferred method for seismic rehabilitation of buildings in many high-seismic-hazard countries. Applications of the method for non-building constructions such as bridges are beyond the scope of this standard. Thus its application to this kind of structure should be approached with care. Target displacement has reasonable accuracy for buildings with strong columns and weak beams, where there is the development of plastic hinges. Due to high stiffness and strength of the deck relative to the piers in most bridges, this mechanism does not occur, and it is necessary to evaluate the accuracy of DCM for such structures. In this research, an attempt is made to evaluate the credibility of DCM in the ASCE/SEI 41-06 standard for estimating target drifts in concrete regular bridges under strong ground motions. To apply the extension of the method to bridge structures, the definition of new correction factor CB, which should be multiplied to previous coefficients, is required. This novel coefficient can improve the accuracy of the mentioned method in accessing seismic displacement demands. The coefficient is presented for soil types A to D based on NEHRP soil classification. The validity of the modified DCM is examined for several bridges with use of nonlinear dynamic analysis. Good correlation is found between both procedures.
Keywords
Concrete Regular Bridge; Correction Factor; Displacement Coefficient Method; Nonlinear Dynamic Analysis; Nonlinear Static Analysis
Reference
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امتیاز: 210699
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پست تاریخ: شنبه 27 تیر 1394 - 16:01    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Seismic performance of reinforced concrete dual-system buildings designed using two different design methods
Zeynep T. Değer1*,† and John W. Wallace2
1Earthquake Engineering and Disaster Management Institute, Istanbul Technical University, Istanbul, Turkey
2Department of Civil and Environmental Engineering, University of California, Los Angeles, CA USA
SUMMARY
This paper aims to assess seismic performance and cost efficiency of a 42-story reinforced concrete dualsystem
building, i.e. a centrally located core wall building with perimeter special moment-resisting frames,
hypothetically located in Los Angeles, California. The building was designed based on two different design
approaches by a renowned structural engineering company: (a) following the prescriptive design requirements
of the International Building Code (IBC 2006) and (b) following performance-based design guidelines
described in Los Angeles Tall Building Structural Design Council (LATBSDC 2008). Detailed
analytical models were developed for each building design to assess seismic performance of the buildings
at different hazard levels in terms of various response quantities. Comparisons revealed that a
performance-based designed building experienced modestly less damage associated with smaller interstory
drifts and lower core wall stresses, even though the difference between two designs was modest and excellent
performance was observed in both buildings. From a financial point of view, the performance-based designed
building required higher initial costs due to larger member sizes, yet, lower annual repair costs due to
smaller amount of damage/loss. Copyright © 2015 John Wiley & Sons, Ltd.
Received 29 December 2014; Accepted 28 May 2015
KEY WORDS: tall buildings; reinforced concrete dual-system; code-based design; performance-based design; structural
performance; cost efficiency
THE STRUCTURAL DESIGN OF TALL AND SPECIAL BUILDINGS
Struct. Design Tall Spec. Build. (2015)
Published online in Wiley Online Library (wileyonlinelibrary.com/journal/tal). DOI: 10.1002/tal.1227

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پست تاریخ: پنج‌شنبه 8 مرداد 1394 - 23:25    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Seismic behaviour and design of steel coupling beams in a hybrid coupled shear wall systems
Wan-Shin Park a, Hyun-Do Yun b,∗
a Department of Civil & Environmental Engineering, University of Cincinnati, OH 45221, USA
b Department of Architectural Engineering, Chungnam National University, Daejeon 305-764, South Korea
Received 29 April 2005; received in revised form 27 February 2006; accepted 2 March 2006
Abstract
The hybrid coupled shear wall system is more efficient and economical than individual structural walls because the steel coupling beams
connected shear walls significantly increase the strength, stiffness and energy dissipation capacity of the system. In this study, experimental studies
on the steel coupling beam were carried out. The main test variables were the ratios of the coupling beam strength to the connection strength. In
addition, the seismic design methods are presented for steel coupling beam–wall connection and shear critical and flexure critical steel coupling
beams in hybrid coupled shear wall system consisting of steel coupling beams and reinforced concrete shear walls. Finally, this paper provides
background for design guidelines in hybrid coupled shear walls that include steel coupling beam–wall connections and steel coupling beams.

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پست تاریخ: دوشنبه 12 مرداد 1394 - 21:16    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Effect of Supplemental Damping on Seismic Response of Base Isolated Frames under Near & Far Field Accelerations
Mojtaba Fathi∗, Akbar Makhdoumi**, and Mehdi Parvizi***
Received February 15, 2013/Revised November 10, 2013/Accepted July 12, 2014/Published Online December 12, 2014
··································································································································································································································
Abstract
The seismic isolation, as a passive control method of structures and an innovative approach in resistant seismic design,
significantly reduces the response of structural systems induced by strong ground motions. The performance of these systems in Near
Fault (NF) ground motions with large pulses is different from that of Far Fault (FF) ground motions. It is indicated that the effects of
near field earthquake with large velocity pulses can bring the seismic isolation devices to critical working conditions. To overcome
this problem, the application of viscous damper is represented as an approach to improve the performance of these systems in near
field earthquakes. In the present paper, through modeling six base isolated structures, the seismic responses were studied under near
field and far field earthquakes. Nonlinear time history analyses were performed, applying the finite element software of ABAQUS to
study the influence of various values of supplemental damping (5% ~ 40%) on the responses of base isolated structures. The results
demonstrated that, generally, by increasing supplemental damping ratio under near field earthquakes, the base displacement
decreases; however, the stories relative displacements and accelerations increase. It is observed that by increasing supplemental
damping ratio under far field earthquakes, the base displacement and the stories relative displacements decreases; however, the
stories accelerations increase. Based on the analyses, these variations proved to be more prevalent under near field earthquakes and
taller structures.
Keywords: seismic behavior, base isolation, supplemental damping, near & far field earthquake

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پست تاریخ: دوشنبه 12 مرداد 1394 - 23:01    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Improvements to seismic design of circular prestressed concrete storage tanks
J.H. Wood
John Wood Consulting, Wellington, New Zealand.
M.J.N. Priestley
European School for Advanced Studies in Reduction of Seismic Risk, Pavia, Italy.
Priestley Structural Engineering
ABSTRACT: Several of the main issues of concern in prestressed concrete tank seismic
design are addressed. The most important of these is the application of structural analysis
methods for predicting the reserve capacity above the elastic response force levels.
Another of the important issues investigated was the influence of soil-structure interaction
on the response of both the horizontal and vertical modes of vibration. An analysis
procedure for estimating the reserve capacity of prestressed concrete tanks is presented
and the method illustrated by the analysis of a tank of typical dimensions. Charts for
estimating the influence of soil-structure interaction for the practical range of tank sizes
and foundation conditions are also presented.
http://www.nzsee.org.nz/db/2003/View/Paper120s.pdf

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پست تاریخ: دوشنبه 19 مرداد 1394 - 13:36    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Does capacity design do the job?: An examination of higher mode effects in cantilever walls
Auteur(s) / Author(s)
PRIESTLEY M. J. N. (1) ;
Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)
(1) European School for Advanced Studies in the Reduction of Seismic Risk (the Rose School) at Pavia, ITALIE
Résumé / Abstract
Current provisions in the New Zealand Loadings code for dynamic amplification of moment and shear force in cantilever wall buildings are critically examined. Based on time-history analyses of six wall structures, from two- to twenty-storeys, it is found that higher mode effects are inadequately represented by either the equivalent lateral force or modal response spectrum design methods. The time-history results indicate that dynamic amplification is dependent on both initial period, and expected displacement ductility level. Two different methods for consideration of higher mode effects in cantilever walls are proposed. The first is based on a simple modification of the modal response spectrum method, while the second is appropriate for single-mode design approaches such as the equivalent lateral force method. Both are found to give excellent representation of expected response. It is shown that providing capacity protection at the design seismic intensity does not ensure against undesirable failure modes at intensities higher than the design level. This has significance for the design of critical facilities, such as hospitals.
Revue / Journal Title
Bulletin of the New Zealand Society for Earthquake Engineering ISSN 1174-9857
Source / Source
2003, vol. 36, no4, pp. 276-292 [17 page(s) (article)] (11 ref.)

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پست تاریخ: سه‌شنبه 20 مرداد 1394 - 23:45    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Role of Higher-“Mode” Pushover Analyses in Seismic Analysis of Buildings
Rakesh K. Goel,a… M.EERI, and Anil K. Chopra,b… M.EERI
The role of higher-“mode” pushover analyses in seismic analysis of buildings is examined in this paper. It is demonstrated that the higher-“mode” pushover curves reveal plastic hinge mechanisms that are not detected by the first-“mode” or other FEMA-356 force distributions, but these purely local mechanisms are not likely to develop during realistic ground motions in an otherwise regular building without a soft and/or weak story. Furthermore, the conditions necessary for “reversal” of a higher-“mode” pushover curve are examined. It is shown that “reversal” in a higher-“mode” pushover curve occurs after formation of a mechanism if the resultant force above the bottom of the mechanism is in the direction that moves the roof in a direction opposite to that prior to formation of the mechanism. Such “reversal” can occur only in higher-“mode” pushover analyses but not in the pushover analyses for the first-“mode” or other FEMA-356 force distributions. However, the “reversal” in higher-“mode” pushover curves was found to be very rare in several recent investigations that examined behavior of many moment-resisting frame buildings. Included are guidelines for implementing the Modal Pushover Analysis for buildings that display “reversal” in a higher-“mode” pushover curve.

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