17层钢框架在北岭地震下的破坏预测

发布时间：2018-09-12 13:19

【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。
[Abstract]:In order to further study the effect of cumulative damage degradation on the overall seismic behavior of steel frames, an equivalent constitutive model considering damage degradation is applied to practical projects. The 17-story steel frame which was severely damaged in the 1994 Beiling earthquake was analyzed. The equivalent constitutive model and the concentrated plastic hinge model are established, and the structural deformation, failure mode and failure location are predicted by the input of the actual seismic wave for dynamic time history analysis. The difference of seismic response between models with and without damage is discussed. The results show that the equivalent constitutive model can accurately predict the deformation and failure characteristics of steel frames under strong earthquake, which is in good agreement with the actual situation. The traditional model is improved to improve the calculation accuracy. Because of the damage of members and joints, the actual deformation of the whole structure will be obviously larger than that of the calculation results without considering the damage model. If this effect is not taken into account, the design safety risks may be caused.
【作者单位】：北京交通大学土木建筑工程学院;清华大学土木工程系;
【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)
【分类号】：TU973.13

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