Technical Papers
Jul 26, 2017

Seismic Base Shear Modification Factors for Timber-Steel Hybrid Structure: Collapse Risk Assessment Approach

Publication: Journal of Structural Engineering
Volume 143, Issue 10

Abstract

In this paper, to supplement the Canadian building code for a timber-steel hybrid structure, over-strength, and ductility-related force modification factors are developed and validated using a collapse risk assessment approach. The hybrid structure incorporates cross-laminated timber (CLT) infill walls within steel moment resisting frames. Following the FEMA P695 procedure, archetype buildings of 3-story, 6-story, and 9-story height with middle bay infilled with CLT were developed. Subsequently, a nonlinear static pushover analysis was performed to quantify the actual over-strength factors of the hybrid archetype buildings. To check the FEMA P695 acceptable collapse probabilities and adjusted collapse margin ratios (ACMRs), incremental dynamic analysis was carried out using 60 ground motion records that were selected to regional seismic hazard characteristics in southwestern British Columbia, Canada. Considering the total system uncertainty, comparison of the calculated ACMRs with the FEMA P695 requirement indicates the acceptability of the proposed over-strength and ductility factors.

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Acknowledgments

Funding for this research was provided by the British Columbia Forestry Innovation Investment’s (FII) Wood First Program and the Natural Science Engineering Research Council of Canada Discovery Grant (RGPIN-2014-05013).

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Go to Journal of Structural Engineering
Journal of Structural Engineering
Volume 143Issue 10October 2017

History

Received: Jun 7, 2016
Accepted: Apr 18, 2017
Published online: Jul 26, 2017
Published in print: Oct 1, 2017
Discussion open until: Dec 26, 2017

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Authors

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M. A. Bezabeh, S.M.ASCE [email protected]
Ph.D. Student, School of Engineering, Univ. of British Columbia, 3333 University Way, Kelowna, BC, Canada V1V 1V7. E-mail: [email protected]
S. Tesfamariam, M.ASCE [email protected]
Associate Professor, School of Engineering, Univ. of British Columbia, 3333 University Way, Kelowna, BC, Canada V1V 1V7 (corresponding author). E-mail: [email protected]
M. Popovski [email protected]
Principal Scientist, FPInnovations, and Adjunct Professor, Univ. of British Columbia, 2665 East Mall, Vancouver, BC, Canada V6T 1W5. E-mail: [email protected]
Senior Lecture, Dept. of Civil Engineering, Univ. of Bristol, Queen’s Bldg., University Walk, Bristol BS8 1TR, U.K. E-mail: [email protected]
S. F. Stiemer [email protected]
Emeritus Professor, Dept. of Civil Engineering, Univ. of British Columbia, Vancouver Campus, 6250 Applied Science Lane, Vancouver, BC, Canada V6T 1Z4. E-mail: [email protected]

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