摘要
地震作用下建筑结构抗倒塌能力是性能化抗震设计的核心目标,基于IDA的倒塌易损性分析能够定量评价结构的抗地震倒塌安全性。本文通过一个8层RC框架结构和一个20层RC框架-核心筒结构的算例,指出仅考虑地震动单一水平分量的IDA分析会高估结构抗地震倒塌安全性;而三维地震动输入下结构可能出现更多的倒塌模式,可更全面地体现整体结构的抗震薄弱部位。
Collapse safety is the most important objective of performance-based seismic design, and IDA （incremental dynamic analysis）-based collapse fragility analysis is able to quantitatively evaluate structural collapse safety under earthquakes. In this paper, it is illustrated that IDA considering single horizontal component of ground motion will over-estimate structural collapse safety through examples of an 8-storey RC frame structure and a 20-storey RC frame-core wall structure. More collapse modes may be appear with three-dimensional ground motion input, so that more potential seismic vulnerability is clearly exposed. Therefore, IDA considering three-dimensional ground motion input should be adopted for collapse safety evaluation.
出处
《工程抗震与加固改造》
北大核心
2011年第6期1-7,共7页
Earthquake Resistant Engineering and Retrofitting
基金
国家科技支撑计划项目(2009BAJ28B01)
中国工程院重大咨询项目(2010-ZD-4)
国家自然科学基金重点项目(90815025)
上海市工程结构新技术重点实验室开放课题(2010-KF04)
关键词
动力增量分析
三维地震动
倒塌模式
抗地震倒塌安全性
incremental dynamic analysis
three-dimensional earthquake ground motion
collapse mode
collapse safety subjected to earthquake
