于晓辉, 吕大刚, 范峰. 基于易损性指数的钢筋混凝土框架结构地震损伤评估[J]. 工程力学, 2017, 34(1): 69-75,100. DOI: 10.6052/j.issn.1000-4750.2015.09.0731
引用本文: 于晓辉, 吕大刚, 范峰. 基于易损性指数的钢筋混凝土框架结构地震损伤评估[J]. 工程力学, 2017, 34(1): 69-75,100. DOI: 10.6052/j.issn.1000-4750.2015.09.0731
YU Xiao-hui, LÜ Da-gang, FAN Feng. SEISMIC DAMAGE ASSESSMENT OF RC FRAME STRUCTURES BASED ON VULNERABILTY INDEX[J]. Engineering Mechanics, 2017, 34(1): 69-75,100. DOI: 10.6052/j.issn.1000-4750.2015.09.0731
Citation: YU Xiao-hui, LÜ Da-gang, FAN Feng. SEISMIC DAMAGE ASSESSMENT OF RC FRAME STRUCTURES BASED ON VULNERABILTY INDEX[J]. Engineering Mechanics, 2017, 34(1): 69-75,100. DOI: 10.6052/j.issn.1000-4750.2015.09.0731

基于易损性指数的钢筋混凝土框架结构地震损伤评估

SEISMIC DAMAGE ASSESSMENT OF RC FRAME STRUCTURES BASED ON VULNERABILTY INDEX

  • 摘要: 在传统地震易损性分析的基础上,提出了易损性指数的概念,并用其来评估结构的地震损伤。通过引入群体结构震害评估中震害指数的概念,结合解析地震易损性分析得到的结构破坏状态概率,将震害指数的数学期望作为单体结构的易损性指数。选择8层和10层两组考虑不同抗震设防水平的钢筋混凝土框架结构为研究对象,分析得到结构的地震易损性曲线、破坏状态概率曲线、易损性指数曲线以及结构在小震、中震和大震作用下的易损性指数。分析结果表明:按我国抗震规范设计的钢筋混凝土框架结构基本可以满足“小震不坏”、“中震可修”和“大震不倒”的性能要求。在大震作用下,结构可以较好地控制较严重破坏的发生。随着抗震设防水平的提升,结构的抗震能力得到了加强,但结构在小震、中震和大震作用下的易损性指数却发生了增加。

     

    Abstract: An index in terms of vulnerability index is proposed to assess structural damage due to earthquake based on conventional seismic fragility analysis. The methodology of assessing earthquake consequences at the regional scale using the damage index is adopted and the numerical expectation of the damage index is calculated to quantify the vulnerability index of an individual building, where the damage state probability is derived through analytical seismic fragility analysis. Two groups of RC frames of 8- and 10-story height are considered as study cases, each of which includes frames designed to various seismic fortification levels. Seismic fragility curves, damage state probability curves, vulnerability index curves and vulnerability indices at frequent earthquake (FE), design-based earthquake (DBE) and maximum consider earthquake (MCE) intensities are computed separately. The results show that the RC frames designed according to the current Chinese codes can basically satisfy the performance requirements of "no damage under FE", "no unrepairable damage under DBE" and "no collapse under MCE". At MCE intensities, the reference frames illustrate good performance of controlling the occurrence of severe damages. Structural resistance against earthquake is enhanced due to the increase of seismic fortification level; however the conditional seismic vulnerability indices upon FE, DBE and MCE are increased accordingly.

     

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