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Risk-Based Design of Regular Plane Frames Subject to Damage by Abnormal Events: A Conceptual Study
| 题名： | Risk-Based Design of Regular Plane Frames Subject to Damage by Abnormal Events: A Conceptual Study |
| 正文语种： | eng |
| 作者： | Beck, Andre T.;Ribeiro, Lucas da Rosa;Valdebenito, Marcos;Jensen, Hector |
| 作者单位： | Univ Sao Paulo Dept Struct Engn Av Trabalhador Sao Carlense 400 BR-13566590 Sao Carlos SP Brazil;Univ Sao Paulo Dept Struct Engn Av Trabalhador Sao Carlense 400 BR-13566590 Sao Carlos SP Brazil;Univ Adolfo Ibanez Fac Engn & Sci Av Padre Hurtado 750 Vina Del Mar 2562340 Chile;Univ Tecn Federico Santa Maria Dept Obras Civiles Av Espana 1680 110V Valparaiso Chile |
| 关键词： | Risk optimization;Progressive collapse;Alternative path method;Discretionary column removal;Structural reliability;Regular frame structures;Optimal design;Probability threshold |
| 摘要： | 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. |
| 出版年： | 2022 |
| 期刊名称： | Journal of structural engineering |
| 卷： | 148 |
| 期： | 1 |
| 页码： | 04021229.1-04021229.15 |
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