Parametric evaluation of multi-tiered ordinary concentrically braced frames under seismic loading

Aradhana Agarwal, Larry A. Fahnestock

Research output: Contribution to conferencePaperpeer-review

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 languageEnglish (US)
StatePublished - 2021
EventAnnual Stability Conference Structural Stability Research Council 2021, SSRC 2021 - Louisville, United States
Duration: Apr 13 2021Apr 16 2021

Conference

ConferenceAnnual Stability Conference Structural Stability Research Council 2021, SSRC 2021
Country/TerritoryUnited States
CityLouisville
Period4/13/214/16/21

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment

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