摘要
为进一步研究累积损伤退化对钢框架整体抗震性能的影响,并将考虑损伤退化的等效本构模型应用到实际工程之中,选取在1994年北岭地震中受到严重破坏的17层钢框架进行分析。分别建立等效本构模型以及集中塑性铰模型,通过输入实际地震波进行动力时程分析,对结构变形、破坏模式以及破坏位置进行预测,探讨考虑损伤和不考虑损伤的模型计算结构地震响应的差异。分析结果表明:等效本构模型能够较为准确地预测钢框架在强烈地震作用下的变形和破坏特征,与实际情况较为吻合,对传统模型进行改进,提高计算精度。由于构件和节点损伤,整体结构的实际变形会明显大于不考虑损伤模型的计算结果,如果不考虑此影响,可能会引起设计安全隐患。
In order to further study the effect of cumulative damage and degradation on seismic behaviours of steel frames and apply the equivalent constitutive model to actual project, a damaged 17-storey steel frame by Northridge earthquake was selected. Time history analyses of both equivalent constitutive model considering damage and lumped plastic hinge model without considering damage were carried out. Structural deformation, failure modes and damage positions were predicted. The differences in seismic responses calculated by the two models were compared. The analysis results show that: Equivalent constitutive model can more accurately predict the deformation and failure of steel frames under seismic excitations, which were more consistent with actual observations. The model improved the traditional beam element model and enhanced computational accuracy. Due to the damage of members and connections, the actual deformations of steel structures subjected to rare earthquake were obviously larger than the calculated results without considering damage. If this effect was not considered, the design would be unsafe.
出处
《工程力学》
EI
CSCD
北大核心
2015年第3期50-56,共7页
Engineering Mechanics
基金
中央高校基本科研业务费专项资金项目(2014JBM074)
国家自然科学基金项目(51038006)
关键词
钢框架
等效本构模型(ECM)
集中塑性铰模型
损伤退化
弹塑性时程分析
破坏预测
steel frame
equivalent constitutive model(ECM)
lumped plastic hinge model
damage and degradation
nonlinear time history analysis
damage prediction
