Probabilistic evaluation of failure time of reinforced concrete frame in post‐earthquake fire scenario

IF 3 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Structural Concrete Pub Date : 2024-08-15 DOI:10.1002/suco.202300353

Majid Moradi, HamidReza Tavakoli, GholamReza Abdollahzade

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Abstract

This paper aims at assessing the failure time of a 7‐story reinforced concrete (RC) frame in a post‐earthquake fire (PEF) event probabilistically. Cumulative distribution functions (CDF) of the studied frame's failure time in various seismic load intensities have been calculated and presented with the aid of Monte Carlo analysis. Seismic load intensity, failure time, and failure probability are three parameters that are correlated through probabilistic analysis. The effects of cracking, spalling, and residual deformations resulted from the seismic load are considered in the strength of structure against the fire load. Seismic load intensity, materials properties, gravity load, and geometry are considered as random variables and one probabilistic analysis has been carried out for each seismic load intensity. The results have illustrated that in low seismic load intensities, probabilistic values of failure time in a structure subjected to pure fire load are equal to the one exposed to PEF. With the increase of seismic load intensity, the effects of cracking, spalling, and residual deformations would lead to a decline in the strength of structural elements against PEF scenario. The failure time in 50% failure probability for Sa = 0.2 g, Sa = 1 g, and Sa = 2 g intensities has been calculated as 14,300, 12,200, and 5100 s, respectively. The analysis results have shown that in an unspecified seismic load intensity, the failure time of the 7‐story RC frame for the 50% occurrence probability is equal to 9750 s.

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震后火灾情况下钢筋混凝土框架破坏时间的概率评估

本文旨在从概率角度评估一个 7 层钢筋混凝土（RC）框架在震后火灾（PEF）事件中的破坏时间。借助蒙特卡罗分析法，计算并展示了所研究框架在不同地震荷载烈度下破坏时间的累积分布函数（CDF）。地震荷载强度、破坏时间和破坏概率这三个参数通过概率分析相互关联。在计算结构抗火荷载强度时，考虑了地震荷载产生的开裂、剥落和残余变形的影响。地震荷载强度、材料特性、重力荷载和几何形状被视为随机变量，并对每种地震荷载强度进行了一次概率分析。结果表明，在地震荷载强度较低的情况下，承受纯火灾荷载的结构的破坏时间概率值与承受 PEF 的结构的破坏时间概率值相等。随着地震荷载强度的增加，开裂、剥落和残余变形的影响将导致结构构件在 PEF 情况下的强度下降。经计算，在 Sa = 0.2 g、Sa = 1 g 和 Sa = 2 g 强度下，50%破坏概率下的破坏时间分别为 14 300 秒、12 200 秒和 5100 秒。分析结果表明，在未指定的地震荷载烈度下，发生概率为 50%的 7 层 RC 框架的破坏时间等于 9750 秒。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Structural Concrete CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL

CiteScore

5.60

自引率

15.60%

发文量

284

审稿时长

3 months

期刊介绍： Structural Concrete, the official journal of the fib, provides conceptual and procedural guidance in the field of concrete construction, and features peer-reviewed papers, keynote research and industry news covering all aspects of the design, construction, performance in service and demolition of concrete structures. Main topics: design, construction, performance in service, conservation (assessment, maintenance, strengthening) and demolition of concrete structures research about the behaviour of concrete structures development of design methods fib Model Code sustainability of concrete structures.