工程力学 ›› 2018, Vol. 35 ›› Issue (12): 107-115.doi: 10.6052/j.issn.1000-4750.2017.09.0692

• 土木工程学科 • 上一篇    下一篇

锈蚀钢框架地震易损性评定方法

徐善华, 张宗星, 李柔, 位龙虎   

  1. 西安建筑科技大学土木工程学院, 西安 710055
  • 收稿日期:2017-09-03 修回日期:2018-01-14 出版日期:2018-12-14 发布日期:2018-12-14
  • 通讯作者: 张宗星(1990-),男,山东人,博士生,主要从事工程结构耐久性研究(E-mail:zhangzongxinglr@163.com). E-mail:zhangzongxinglr@163.com
  • 作者简介:徐善华(1963-),男,江苏人,教授,博士,博导,主要从事工程结构耐久性研究(E-mail:xushanhua@163.com);李柔(1993-),女,浙江人,硕士生,主要从事工程结构耐久性研究(E-mail:942060497@qq.com);位龙虎(1988-),男,河南人,硕士生,主要从事工程结构耐久性研究(E-mail:798700965@qq.com).
  • 基金资助:
    国家十三五重点研发计划课题项目(2016YFC0701305);国家自然科学基金项目(51378417)

A METHOD FOR THE SEISMIC VULNERABILITY ASSESSMENT OF CORRODED STEEL STRUCTURES

XU Shan-hua, ZHANG Zong-xing, LI Rou, WEI Long-hu   

  1. Department of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
  • Received:2017-09-03 Revised:2018-01-14 Online:2018-12-14 Published:2018-12-14

摘要: 钢结构锈蚀降低了钢材塑性变形能力,降低了断裂韧性,势必影响锈蚀钢结构的抗震性能。该文借助于加速腐蚀试验,研究了钢材力学性能随锈蚀程度的变化规律,建立了钢材强度、延性指标与锈蚀程度之间的关系;研究了地震作用下钢结构损伤状态及性能水平与锈蚀程度之间的关系,并基于极限破坏状态提出了锈蚀钢框架层间位移角限值取值方法。以5层钢框架为例,运用静力弹塑性分析方法,探讨了锈蚀对钢框架构抗震性能的影响;运用增量动力分析法,建立结构损伤指标与地震动强度指标的关系,得到不同龄期锈蚀钢框架地震易损性曲线,提出了锈蚀钢框架地震易损性评定方法。研究结果表明:同龄期不同极限状态结构超越极限状态的概率不同,倒塌极限状态下差距较大,而正常使用极限状态差距较小,若不修正层间位移角限值会高估锈蚀钢框架抗震性能。

关键词: 锈蚀, 钢结构, 性能水平限值, 地震易损性, 评定方法

Abstract: Steel structure rust reduces the plastic of steel and accelerates crack propagation, which has great influence on the seismic performance of steel structures. With the help of accelerated corrosion test, the relationships between steel strength, ductility index and corrosion degree are established. In this paper, the relationships between the damage state of steel structure and the degree of corrosion of steel structure under earthquake action are studied, and the value of the displacement angle between the frame layer of corroded steel is proposed based on the limit failure state. The influence of corrosion resistance on the seismic performance of steel frames is discussed by using the static elastoplastic analysis method. Using the incremental dynamic analysis method, to establish the relationship between the structural damage index and the ground motion intensity index, the earthquake vulnerability curves of corroded steel frames of different ages are obtained. An earthquake vulnerability assessment method of corroded steel frames is established. The results show that different limit states of the same age have different probability of exceeding the limit state, and the gap between the limit state of collapse is relatively large, while the difference of serviceability limit state is small. The seismic performance of rust steel frames can be overestimated if the interlayer displacement angle limit is not corrected.

Key words: corrosion, steel structure, performance level limitation, seismic vulnerability, the method of evaluation

中图分类号: 

  • TU352.1+1
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