工程力学 ›› 2020, Vol. 37 ›› Issue (5): 74-81.doi: 10.6052/j.issn.1000-4750.2019.05.0244

• 土木工程学科 • 上一篇    下一篇

掉层RC框架结构基于典型失效模式的失效概率评估

刘流1, 李英民1,2, 姬淑艳2,3   

  1. 1. 重庆大学土木工程学院, 重庆 400045;
    2. 重庆大学山地城镇建设与新技术教育部重点实验室, 重庆 400045;
    3. 重庆大学建设管理与房地产学院, 重庆 400045
  • 收稿日期:2019-05-06 修回日期:2020-01-29 出版日期:2020-05-25 发布日期:2020-02-21
  • 通讯作者: 姬淑艳(1967-),女,河南商丘人,副教授,硕士,主要从事结构理论分析研究(E-mail:jishuyan@cqu.edu.cn). E-mail:jishuyan@cqu.edu.cn
  • 作者简介:刘流(1989-),男,湖北天门人,博士生,主要从事钢筋混凝土结构抗震研究(E-mail:liuliu@cqu.edu.cn);李英民(1968-),男,山东无棣人,教授,博士,主要从事地震工程、结构抗震研究和城市防灾减灾研究(E-mail:liyingmin@cqu.edu.cn).
  • 基金资助:
    国家自然科学基金重点项目(51638002);国家自然科学基金项目(51878101)

FAILURE PROBABILITY EVALUATION OF RC FRAME SUPPORTED BY FOUNDATIONS WITH DIFFERENT ELEVATIONS BASED ON TYPICAL FAILURE MODES

LIU Liu1, LI Ying-min1,2, JI Shu-yan2,3   

  1. 1. School of civil Engineering, Chongqing University, Chongqing 400045, China;
    2. Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing University, Chongqing 400045, China;
    3. School of Construction Management and Real Estate, Chongqing University, Chongqing 400045, China
  • Received:2019-05-06 Revised:2020-01-29 Online:2020-05-25 Published:2020-02-21

摘要: 结构失效模式决定了结构在强震下的抗震性能。该文采用基于可靠度理论的割集方法,对掉层框架结构地震作用下的典型失效模型的失效概率进行评估,并与规则框架结构进行对比,分析了掉层框架结构失效模式的特点。结果表明:掉层框架结构的柱极限剪切失效模式年平均发生概率高于规则结构,且掉层框架结构存在剪切破坏先于弯曲破坏的风险,应采取适当加强措施以满足"强剪弱弯"的设计原则;对掉层结构进行基于年平均概率的柱剪力增大系数分析,建议对掉层结构上接地柱进行抗剪承载力设计时,采用抗震等级提高一级所对应的剪力增大系数,且上接地柱全柱段箍筋应加密布置。

关键词: RC掉层框架结构, 失效模式, 割集方法, 易损性分析, 强剪弱弯

Abstract: Structural failure modes play an important role in the seismic performance of RC buildings under strong earthquakes. Typical failure mode-based failure probability of the RC frame supported by foundations with different elevations is evaluated by cut-set method based on system reliability theory, and compared with that of regular frame counterparts. The results show that the annual average failure probability of ultimate shear mode of the frame supported by stepped foundation is higher than that of regular frames, and the risk of shear failure before bending failure exists. Appropriate strengthening measures should be conducted to satisfy the design principle of strong shear-weak bending. By comparing the designs with different shear-amplification coefficients, it is suggested that the seismic level which determines the shear-amplification coefficient be one level higher for the design of shear bearing capacity of the upper embedding column, and dense hoop reinforcement be arranged over the whole length of the upper embedding column.

Key words: RC frame supported by foundations with different elevations, failure mode, cut-set method, fragility analysis, strong shear-weak bending

中图分类号: 

  • TU375.4
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