Abstract
Steel braced frames are commonly used to provide resistance to lateral loads in structures across the United States. In tall, single-story buildings, it is more beneficial to use a multi-tiered braced frame (MT-BF) configuration that is formed by dividing the tall story into multiple bracing panels using horizontal struts. However, there are no out-of-plane supports at the intermediate tier levels and the majority of the seismic mass is located at the top of the frame (typically the roof level) that has important implications in seismic design and performance. The unique conditions in MT-BFs have been shown to cause significant inelastic drift concentration and eventual column instability. This study employs nonlinear analysis of multi-tiered ordinary concentrically braced frames (MT-OCBFs) designed in accordance with two versions of the AISC Seismic Provisions. The responses of frames with tension/compression as well as tension-only bracing are compared. The results show column stability is delayed to larger roof drifts in frames designed with enhanced design provisions. Further, the response of MT-BFs with tension-only bracing is also better than the corresponding frame with traditional tension/compression brace pairs.
Original language | English (US) |
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State | Published - 2021 |
Event | Annual Stability Conference Structural Stability Research Council 2021, SSRC 2021 - Louisville, United States Duration: Apr 13 2021 → Apr 16 2021 |
Conference
Conference | Annual Stability Conference Structural Stability Research Council 2021, SSRC 2021 |
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Country/Territory | United States |
City | Louisville |
Period | 4/13/21 → 4/16/21 |
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment