Seismic Analysis of Hybrid Steel Moment Frame CLT Shear Walls Structures
Publication: Journal of Performance of Constructed Facilities
Volume 35, Issue 5
Abstract
Moderately ductile steel moment frames (SMF) are a common lateral load resisting system (LLRS). They allow for a flexible architectural design for low- and mid-rise buildings but become uneconomical for high-rises due to the large member sections to satisfy the drift requirement. In contrast, lightweight cross laminated timber (CLT) shear walls provide adequate stiffness for resisting lateral loads and controlling drift in high-rise construction. A hybrid structural system combining SMF with balloon-type CLT shearwalls offers an innovative solution for economic and sustainable LLRS for mid- to high-rise buildings. In the research presented in this paper, three hybrid buildings (8-, 12-, and 16-story tall) were designed for the seismicity of Vancouver, Canada, and their performance was compared with benchmark SMF buildings. Ductile connections were used for joining the CLT panels to the steel frame and as hold-downs. The overstrength- and ductility-related force reductions factors of the hybrid system were developed based on the FEMA P695 approach. Nonlinear static and time history analyses were carried out to evaluate the structures’ seismic performance. In the hybrid systems, the use of steel was reduced by 40%–50%, and the maximum interstory drifts were reduced by up to 60% compared with the SMF buildings, demonstrating the potential of combining CLT shear walls with conventional SMF systems.
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Data Availability Statement
Some or all of the data, models, or code that support the findings of this study are available from the corresponding author on reasonable request.
Acknowledgments
This research was supported by the British Columbia Innovation Council through funding to the BC Leadership Chair in TallWood and Hybrid Structures Engineering.
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Published In
Journal of Performance of Constructed Facilities
Volume 35 • Issue 5 • October 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Nov 25, 2020
Accepted: May 10, 2021
Published online: Jul 24, 2021
Published in print: Oct 1, 2021
Discussion open until: Dec 24, 2021
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