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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©2017 American Society of Civil Engineers.
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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