基于结构整体损伤指标的钢框架地震易损性研究

发布时间：2018-10-16 18:38

【摘要】：以9层梁柱焊接钢框架为例,选取20条满足场地条件的地震波,对结构进行动力增量时程分析(IDA),对比分别以层间位移角和能量耗散作为结构整体损伤指标评判的结构损伤程度,发现仅以层间位移角作为结构整体损伤指标会高估结构抗倒塌能力,而仅以能量耗散作为结构整体损伤指标则无法判别结构失效模式。为避免单一结构整体损伤指标的缺点,能够同时考虑整体结构的首超破坏与累积损伤,提出了一个基于层间位移角和能量耗散的双参数线性组合的结构整体损伤模型,定义结构4种极限破坏状态,对比层间位移角、能量耗散与建立的结构整体损伤模型的结构损伤曲线与易损性曲线。结果显示,基于层间位移角和能量耗散的双参数线性组合的结构整体损伤模型能够更加合理的描述结构的损伤程度。
[Abstract]:Taking 9 story Liang Zhu welded steel frame as an example, 20 seismic waves satisfying the site condition are selected, and the dynamic increment time history analysis (IDA),) of the structure is carried out. The damage degree of the whole structure is evaluated by the interstory displacement angle and energy dissipation, respectively. It is found that only taking the displacement angle of the floor as the whole damage index of the structure will overestimate the ability of the structure to resist collapse, while the energy dissipation as the index of the whole damage of the structure can not distinguish the failure mode of the structure. In order to avoid the shortcoming of single structural damage index, the first superdamage and cumulative damage of the whole structure can be considered at the same time. A two-parameter linear damage model based on interstory displacement angle and energy dissipation is proposed. Four kinds of ultimate failure states are defined, and the structural damage curves and vulnerability curves of the whole damage model of the structure are compared with the displacement angle between the layers, energy dissipation and the established structural damage model. The results show that the damage degree of the structure can be described more reasonably by the two-parameter linear damage model based on the displacement angle and energy dissipation.
【作者单位】：西安建筑科技大学土木工程学院;
【基金】：国家科技支撑计划(2013BAJ08B03) 长江学者和创新团队发展计划国家自然科学基金(50978218,51108376) 高等学校博士学科点专项科研基金(20106120110003) 陕西省科研项目(2012K12-03-01,2010JK633,2011KTCQ03-05)
【分类号】：TU311.3

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