Failure Probability of Damaged RC Frame under Fire Using Markov Chain.

International Journal of Advanced Structural Engineering

دوره 12، شماره 4، اسفند 2022   

نوع مقاله: Original Article

شناسه دیجیتال (DOI): 10.30495/ijase.2023.1976830.1067

نویسندگان

MohammadJavad Goodarzi¹؛ Hamidreza Tavakoli²؛ syyed milad hasheminejad³؛ alireza mohseni saravi⁴؛ majid moradi^{* 5}

¹Department of civil engineering, Technical and vocational university(TVU), Tehran, Iran

²Associate Professor, faculty of Civil Engineering, University of Noshirvani, Babol, Iran

³Earthquake Engineering, faculty of Civil Engineering, University of Noshirvani, Babol, Iran

⁴Structure Engineering, faculty of Civil Engineering, University of Azad, Tehran, Iran

⁵PHD in Earthquake Engineering, faculty of Civil Engineering, University of Noshirvani, Babol, Iran

چکیده

Engineering structures are subjected to different loads during their lifetime, which may cause damage or secondary loading effects. Among loading effects on structures, explosion and earthquake may also cause fire. A damaged structure can experience a different response under fire loading in comparison to the intact structure. In addition to strength loss, damaged reinforced concrete (RC) frames may be exposed to cracking and spalling of concrete cover at various damage levels. These phenomena affect heat transfer in the structural section. In this study, Markov probability chain analysis is used to determine the probability of the occurrence of first failure in a 7-story RC frame damaged at different levels is evaluated under fire loading. The time of the first failure in structural elements is also calculated and presented for each damage level. The results show that increased damage levels in RC frame results in a greater probability of failure and reduced time of failure under fire loading scenario. The failure probability was found as zero at damage indices of 0, 0.1 and 0.2, with non-zero probabilities for greater damage indices. The framework developed in this paper outlines the performance assessment procedure for a damaged structure that is later exposed to fire loading.

کلیدواژه‌ها

Probability of Failure؛ Damaged RC Frame؛ Post-damage Fire؛ Markov Probability Matrix؛ Monte Carlo Simulation