考虑锈蚀的钢框架柱地震损伤模型研究

Research on a Seismic Damage Model of Steel Frame Columns Considering Corrosion

为准确评估锈蚀钢框架在地震作用下的损伤,对已有的地震损伤模型进行改进,并对框架柱的地震损伤特性进行分析。建立基于变形和能量组合的双参数损伤模型,对损伤模型中相应的参数给出具体定义和表达式,定义不同破坏等级的损伤指数范围。对3个具有不同锈蚀率的空间钢框架结构进行弹塑性时程分析,并对损伤模型的准确性进行验证。研究结果表明,该模型能够较好地描述锈蚀钢框架柱的地震损伤程度。研究结果可为该类结构构件的地震损伤评估以及基于损伤的抗震设计方法的建立提供理论依据。

In this paper,to accurately evaluate the damage in corroded steel frames under earthquake action,existing seismic damage models are improved and the seismic damage characteristics of frame columns are analyzed.A two-parameter damage model,based on a combination of deformation and energy,is established.The specific definitions and expressions of the corresponding parameters in the damage model are given and the range of damage indexes for different damage grades is defined.Elastic-plastic time-history analyses of three steel frames with different corrosion rates are carried out,and the accuracy of the damage model is verified.The results show that the model describes seismic damage to corroded steel frame columns well.The research results provide a theoretical basis for seismic damage assessment and the establishment of a seismic design method based on damage.