assessment of response modification factor for dual SMRF-BRBBF structures under near and far fault ground motions

Volume 3, Issue 9 - Serial Number 31
December 2021
Pages 84-101

Document Type : Research Article

Authors

1 department of civil engineering west tehran branch islamic azad university tehran iran

2 Department of Civil Engineering, Engineering Faculty,University of Eyvanekey, Semnan, Iran

3 Department of Civil Engineering, Engineering Faculty, Eyvanakey University, Semnan, Iran

Abstract
Application of dual SMRF-BRBF system can be considered as an appropriate choice for resisting seismic loads in high seismicity regions. Taking advantage of having buckling resistant braces which can resist high axial compressive forces without local and global buckling, buckling restrained bracing frame (BRBF) system can be used as an efficient alternative for conventional bracing system. Response modification factor (R factor) is required for seismic design of structures. Therefore, in this research, performance-based R factor is evaluated for dual SMRF-BRBF structures. Considering the fact that in addition to structural properties the seismic load characteristics effect on the load-carrying capacity and R factor, R factor is evaluated specifically for near fault ground motions. To consider the effect of performance level, the R factor is calculated distinctly for Life Safety (LS) and Collapse Prevention (CP) limit states. Nonlinear time history and pushover analysis results are employed for determination of ductility, over-strength and R factor of the sample structures. According to the obtained results, the average of R factor coincident to LS and CP performance levels is 6.1 and 7.9, respectively. The comparison of results obtained for near fault records with those obtained for far fault motions reveals that the R factor is averagely 25% lower for near fault ground motions.

Keywords

[1] Priestley, M.; “Performance based seismic design”, Bulletin of the New Zealand society for earthquake
engineering, vol 33, pp. 325-346, (2111).
www.cpjournals.com ISSN:6262-155X )Civil & Project Journal)CPJ(( نشریه عمران و پروژه
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192
[2] Maheri, M.R.; Kousari, R.; Razazan, M.; “Pushover tests on steel X-braced and knee-braced RC frames”,
Journal of Engineering Structures, vol 25, pp. 1679–1915, (2113).
[3] MacRae, Gregory A.; Yoshihiro Kimura, M.ASCE.; M.ASCE, Charles Roeder.; “Effect of Column Stiffness
on Braced Frame Seismic Behavior”, Journal of Structural Engineering ASCE/MARCH, (2114).
[4] Kim, Jinkoo; Choi, Hyunhoon; “Response modification factors of chevron-braced frames”, Journal of
Engineering Structures, vol 29, pp. 285–311, (2115).
[5] Okazaki, T.; Engelhard, M. D.; “Cyclic loading behavior of eccentric links constructed of ASTM A772
steel”, Journal of Constructional Steel Research, vol 63, pp. 951-965, (2119).
[6] Asgarian, B.; Shokrgozar, H.R.; “BRBF Response modification factor”, Journal of Constructional Steel
Research, vol 65, pp. 271-278, (2117).
[9] Mahmoudi, Mussa; Zaree, Mahdi; “Evaluating response modification factors of concentrically braced steel
frames”, Journal of Constructional Steel Research, vol 66, pp. 1176-1214, (2111).
[8] Izadinia, M.; Rahgozar, M. A.; Mohammadrezaei, O.; “Response modification factor for steel momentresisting
frames by different pushover analysis methods”, Journal of Constructional Steel Research, vol 97, pp.
83-71, (2112).
[7] Mahmoudi, Mussa.; Abdi, Mohammad Ghasem.; “Evaluating response modification factors of TADAS
frames”, Journal of Constructional Steel Research, vol 91, pp. 162–191, (2112).
[11] Abdollah Zadeh, Gholamreza; Mohammadi, Shahrouz; “Behaviour Factor of Double Steel Frame with
Concentric Braces of Large Scale”, Journal of Modelling in Engineering, vol 11, pp. 1-13, (2113).
[11] Rahmani, Z.; Naghipour, M.; Vaseghi Amiri, J.; Karimnezhad, R.; “Comparing Seismic Parameters in Dual
Systems Equipped with Concentric and Eccentric Braces and Side Plate Connection”, Middle-East Journal of
Scientific Research, vol 14, pp. 311-318, (2113).
[12] Mahin, Stephan.; Uriz, Patxi.; Aiken, Ian.; Field, Caroline.; Ko, Eric.; “Seismic Performance Of Buckling
Restrained Braced Frame Systems”, International Journal of 13 th World Conference On Earthquake
Engineering Vancouver, pp. 1-14, (2114).
[13] Kalani Sarokolayi, Leila; Gholampour dehkordi, Sirous; Shafaghati sefidab, Masoud; “Evaluating Response
Modification Factors of Concentrically Braced and Special Moment Steel Frames in Duplex Buildings”, Journal
of Structural Engineering and Geotechnics, vol 5, pp. 31-38, (2115).
[14] Soltangharaei, V.; Razi, M.; Gerami, M.; “Comparative Evaluation of Behavior Factor of SMRF Structures
for Near and Far Fault Ground Motions”, Periodica Polytechnica, Civil Engineering, vol 61, pp. 95, (2116).
[15] Soltangharaei, V.; Razi, M.; Gerami, M.; “Behavior factor of buckling restrained braced structures for near
and far fault ground motions”, International Journal of Structural Engineering, vol 6, pp. 158-191, (2115).
[16] Taghinezhad, R.; Taghinezhad, A.; Mahdavifar, V.; Soltangharaei, V.; “Evaluation of story drift under
pushover analysis in reinforced concrete moment frames”, International Journal of Research and Engineering,
vol 5, pp. 276-312, (2118).
[19] Sadeghi, A., Hashemi, S., Mehdizadeh, K. "Probabilistic Assessment of Seismic Collapse Capacity of 3D Steel
Moment-Resisting Frame Structures". Journal of Structural and Construction Engineering, (2222).
[18] Pouraminian, M., Hashemi, S., Sadeghi, A., Pourbakhshian, S. "Probabilistic Assessment the Seismic Collapse
Capacity of Buckling-Restrained Braced Frames Equipped with Shape Memory Alloys". Journal of Structural and
Construction Engineering, (2222).
[11] Soltangharaei, V., Razi, M., & Gerami, M. J. P. P. C. E. Comparative evaluation of behavior factor of
SMRF structures for near and far fault ground motions. 62(1), 55-22. (2216).
  • Receive Date 20 June 2021
  • Accept Date 06 August 2021
  • First Publish Date 22 November 2021
  • Publish Date 22 November 2021