Progressive collapse resistance of RC beam-column substructures under fire conditions

Huiyun Zhang, Yan Fei Zhu, Yufei Liu, Weiqi Liang, Yao Yao

科研成果: 期刊稿件文章同行评审

13 引用 (Scopus)

摘要

To better understand the performance of reinforced concrete (RC) structures subjected to fire under column-removal scenarios, 3D numerical models were established to analyze the structural behavior of pre-loaded beam-column substructures under elevated temperatures in this paper. The temperature-dependent thermal and mechanical properties of concrete and steel were adopted to perform the sequentially coupled thermal-mechanical analysis in an ABAQUS/Explicit solver in a quasi-static manner. To capture the damage evolution of concrete and steel rebar, the concrete damaged plasticity (CDP) and ductile damage for metals (DDM) models were calibrated in the numerical model. Existing experimental data under both ambient and high temperatures were used to validate the feasibility of the proposed numerical model. The structural performance of the RC substructure under the loading stage and heating stage was investigated and the contributions of the resisting mechanisms were quantified using the analytical method. The effects of structural design features, such as reinforcement ratios, concrete strengths, span-to-depth ratios, and fire curves, on the collapse-resisting performance were analyzed in the parametric study. The chord rotation limit criteria regulated by the US Department of Defense (DOD) were utilized to identify the failure of substructures under fire and middle column-removal scenarios.

源语言英语
文章编号104985
期刊Structures
56
DOI
出版状态已出版 - 10月 2023
已对外发布

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