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Author Beck, A.T.; Ribeiro, L.D.; Valdebenito, M.; Jensen, H.
Title Risk-Based Design of Regular Plane Frames Subject to Damage by Abnormal Events: A Conceptual Study Type
Year 2022 Publication Journal of Structural Engineering Abbreviated Journal J. Struct. Eng.
Volume 148 Issue 1 Pages 04021229
Keywords Risk optimization; Progressive collapse; Alternative path method; Discretionary column removal; Structural reliability; Regular frame structures; Optimal design; Probability threshold
Abstract Constructed facilities should be robust with respect to the loss of load-bearing elements due to abnormal events. Yet, strengthening structures to withstand such damage has a significant impact on construction costs. Strengthening costs should be justified by the threat and should result in smaller expected costs of progressive collapse. In regular frame structures, beams and columns compete for the strengthening budget. In this paper, we present a risk-based formulation to address the optimal design of regular plane frames under element loss conditions. We address the threat probabilities for which strengthening has better cost-benefit than usual design, for different frame configurations, and study the impacts of strengthening extent and cost. The risk-based optimization reveals optimum points of compromise between competing failure modes: local bending of beams, local crushing of columns, and global pancake collapse, for frames of different aspect ratios. The conceptual study is based on a simple analytical model for progressive collapse, but it provides relevant insight for the design and strengthening of real structures.
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ISSN 0733-9445 ISBN Medium
Area Expedition Conference
Notes WOS:000719535300021 Approved
Call Number UAI @ alexi.delcanto @ Serial 1493
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