X-Bracing Configuration and Seismic Response

Authors: Saeed Rahjoo, Babak H. Mamaqani

Abstract:

Concentric bracing systems have been in practice for many years because of their effectiveness in reducing seismic response. Depending on concept, seismic design codes provide various response modification factors (R), which itself consists of different terms, for different types of lateral load bearing systems but configuration of these systems are often ignored in the proposed values. This study aims at considering the effect of different x-bracing diagonal configuration on values of ductility dependent term in R computation. 51 models were created and nonlinear push over analysis has been performed. The main variables of this study were the suitable location of X–bracing diagonal configurations, which establishes better nonlinear behavior in concentric braced steel frames. Results show that some x-bracing diagonal configurations improve the seismic performance of CBF significantly and explicit consideration of lateral load bearing systems seems necessary.

Keywords: Bracing configuration, concentrically braced frame (CBF), Push over analyses, Response reduction factor.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1093058

References:

[1] International Building Code, International Code Council, Inc. Country Club Hills, Illinois, U.S.A., 2003
[2] International Building Code., International Code Council, Inc. Country Club Hills, Illinois, U.S.A., 2010
[3] Shaishmelashvili, V. N.; Edisherashvili, N. A., "Experimental studies of dynamic characteristics of multi-storey steel frame building large-scale models with different vertical bracings”, Preprints of the Fifth World Conference on Earthquake Engineering; 5 pages. 1973
[4] Suzuki, T.; et al. "Experimental study on the elasto-plastic behavior of tensile braced frames”, Transactions of the Architectural Institute of Japan, No. 228, pp. 57-64. Feb. 1975.
[5] Wakabayashi, M.; Nakamura, T.; Yoshida, N. "Experimental studies on the elastic-plastic behavior of braced frames under repeated horizontal loading – Part 3: experiments of one story-one bay braced frames”, Bulletin of the Disaster Prevention Research Institute, Vol. 29, No. 4, pp. 143- 164 (Mar. 1980).
[6] Lee, Kangmin; Bruneau, Michel. "Energy Dissipation of Compression Members in Concentrically Braced Frames: Review of Experimental Data”, Journal of Structural Engineering (New York, N.Y.), Vol. 131, No. 4, pp. 552-559, Apr. 2005
[7] P. Shademan Heidari, H. Kayhani, R. Ahmady Jazany, "Eeffects of X-Bracing Resistant System Configuration On Limit State Behaviour In Steel Frames Using Pushover Analysis” in Proc. The 9th U.S. National and 10th Canadian Conference on Earthquake Engineering, Toronto, Ontario, 2010.
[8] P. Shademan Heidari, R. Ahmady Jazany, H. Kayhani, "Effect of Chevron Bracing Configuration on Limit State Nonlinear Behavior of Steel Braced frames”, in Proc. 14th European Conference of Earthquake Engineering, Macedonia, 2010.
[9] P. Shademan Heidari, H. Kayhani, R. Ahmady Jazany, "An Investigation on Bracing Configuration Effects on Behavior of Diagonally Braced Frames”, in Proc. 14th European Conference of Earthquake Engineering, Macedonia, 2010.
[10] P. Shademan Heidari, R. Ahmady Jazany, H. Kayhani, "Effect of diagonally Arranged X-braced frames on behavior of high rise Braced Steel frames”, in Proc. high-rise Towers and Tall buildings International conference (HTTB), Munich, Germany, 2010.
[11] P. Shademan Heidari, H. Kayhani, R. Ahmady Jazany, "Experimental study on the effects of different concentric bracing configuration on steel frame inelastic behavior”, Australian Journal of Basic and Applied Sciences; No 12, vol. 5 , pp 2716-28, 2011.
[12] P. Shademan Heidari, R. Ahmady Jazany, H. Kayhani, "An investigation on bracing configuration effects on behavior of concentrically braced steel frames” World Applied Science Journal; No 9, vol. 17, pp 1095-1108. 2012.
[13] R. Ahmady Jazany, B.H. Hosseini Hashemi, H. Khobe, H. Kayhani, "Seismic Behavior and Ductility of Concentric Cross Bracing with the Use of Sliding-Tension Action”, in Proc. 14th European Conference of Earthquake Engineering Macedonia, 2010.
[14] R. Ahmady Jazany, I. Hajirasouliha, H. Farshchi, "Influence of masonry infill on the seismic performance of concentrically braced frames”, Journal of constructional Steel Research, vol. 88, pp 160-163, 2013.
[15] Federal management agency; FEMA 356 "Prestandard and commentary for the seismic rehabilitation of building”, Federal management agency, 2000.
[16] Uang CMU, "Establishing R (or Rw) and Cd factors for building seismic provisions”. Journal of Structural Engineering (ASCE); Vol 117, No 1, PP 19–28, 1991.
[17] A. Behbahani, "Conceptual definition of earthquake resistant design criteria”, BHRC, Iran 1996.