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

Matiyas Bezabeh, Solomon Tesfamariam, Marjan Popovski, Katsu Goda, Siegfried Stiemer

Research output: Contribution to journalArticle (Academic Journal)peer-review

25 Citations (Scopus)
340 Downloads (Pure)


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.

Original languageEnglish
Article number04017136
Number of pages12
JournalJournal of Structural Engineering
Issue number10
Early online date20 Jul 2017
Publication statusPublished - Oct 2017


  • Adjusted collapse margin ratio
  • Cross-laminated timber (CLT) infill walls
  • Force modification factors
  • Incremental dynamic analysis
  • Wood structures
  • Wood-hybrid system


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