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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

41卷

期数:

2024年05期

页码:

52-62

栏目:

建筑结构

出版日期:

2024-09-20

文章信息/Info

Title:

Seismic risk assessment method for frame structures considering steel corrosion

文章编号:

1673-2049(2024)05-0052-11

作者:

李 波,许亚男,严国虔,阳 绪,张云浩

(长安大学 建筑工程学院,陕西 西安 710061)

Author(s):

LI Bo, XU Yanan, YAN Guoqian, YANG Xu, ZHANG Yunhao

(School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China)

关键词:

钢筋混凝土框架;  地震风险;  性能退化;  钢筋腐蚀;  增量动力分析

Keywords:

reinforced concrete frame;  earthquake risk;  capacity degradation;  steel corrosion;  incremental dynamic analysis

分类号:

TU375.4

DOI:

10.19815/j.jace.2022.09008

文献标志码:

A

摘要:

为科学评估框架结构考虑钢筋腐蚀的地震风险,研究了钢筋腐蚀及混凝土开裂对框架结构抗倒塌性能的影响,将结构倒塌极限状态对应的结构变形能力均值定义为时间的函数,考虑老化时间对结构倒塌年均失效概率式积分,得到考虑钢筋腐蚀效应的结构地震倒塌概率; 提出了考虑结构老化效应的地震风险评估方法,将该方法应用于不同设防烈度的锈蚀RC框架结构,研究了在接近倒塌极限状态下考虑结构老化效应对地震风险的影响。结果表明:6、7、8度设防的框架结构锈蚀50年比未锈蚀结构的倒塌储备系数(CMR)分别小18.7%、31.0%、19.4%; 6、7、8度设防的框架结构考虑老化效应50年的年均倒塌超越概率比不考虑老化效应结构的年均倒塌超越概率分别大28.6%、59.8%、32.6%; 建议在不同烈度区RC框架结构的地震风险评估中考虑结构老化效应的影响。

Abstract:

In order to scientifically evaluate the seismic risk of steel corrosion in frame structures, the effects of steel corrosion and concrete cracking on the anti-collapse performance of frame structures were studied. The mean deformation capacity of the structure corresponding to the collapse limit state was defined as a function of time, and the annual failure probability of the structure collapse was integrated by considering the aging time. The seismic collapse probability of the structure considering the corrosion effect of steel bars was obtained. A seismic risk assessment method considering the aging effect of structures was proposed, and this method was applied to corroded RC frame structures with different seismic intensities. The impact of structural aging effects on seismic risk near the collapse limit state was studied. The results show that the collapse margin ratio(CMR)of a frame structure with 6, 7, 8-degree seismic intensities that has been corroded for 50 years is 18.7%, 31.0%, and 19.4% lower than that of a non corroded structure, respectively. The mean annual collapse rate of a frame structure with 6, 7, 8-degree seismic intensities considering aging effects for 50 years is 28.6%, 59.8%, and 32.6% higher than that of a structure without considering aging effects, respectively. It is recommended to consider the influence of structural aging effects in the seismic risk assessment of RC frame structures in different intensity zones.

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备注/Memo

备注/Memo:

收稿日期:2023-09-01
基金项目:国家自然科学基金项目(51208042)
作者简介:李 波(1979-),男,工学博士,副教授,E-mail:liboxuat@163.com。

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更新日期/Last Update: 2024-09-30