延性损伤准则在钢框架结构动力时程分析中的应用

Application of ductile damage criterion in dynamic time history analysis of steel frame structures

考察了金属材料延性损伤准则在大型钢框架结构强震作用下损伤评估分析中的应用效果。利用有限元软件ABAQUS分别将延性损伤准则引入到一座4层及一座18层钢框架结构的动力时程分析中,考察了材料损伤累积效应对框架结构整体抗震性能及倒塌机制的影响。同时还利用损伤准则对框架结构的损伤部位与发展程度进行了预测。研究结果表明,材料损伤累积对多高层钢框架结构的抗震性能有重要的影响。延性损伤准则的使用可以正确地模拟多高层钢框架结构的倒塌机制,并可以准确地预测钢框架结构在强震中的破坏部位与损伤程度。提出的方法可以为预测钢框架结构的薄弱部位、震后评估及优化设计提供方法。

The reliability of the ductile metallic damage criterion in assessing the failure condition of large-scale steel frame structure under strong earthquake was investigated.A ductile damage criterion was introduced in the dynamic history analysis of a 4-story and 18-story steel frame system using the software ABAQUS,respectively.The effect of damage accumulation of the material on the collapse mechanism of the frame structures was studied.Meanwhile,the damage location and degree of the frame system were predicted by using the damage criterion.The analysis results show that the damage accumulation of the steel has an important influence on the overall seismic behavior of the steel frame structures. The use of the ductile damage criterion can successfully simulate the collapse mechanism and predict the failure location and degree of the frame structures.The ductile damage criterion proposed can be used as an effective method for weak zone determination,seismic assessment and optimization design.