多龄期钢框架结构地震损伤模型研究

基于ABAQUS非线性有限元分析,通过控制变量法分析得出影响多龄期钢框架地震损伤的主控因素为构件有效截面收缩与钢材极限强度退化。定义广义的锈蚀损伤,并探索锈蚀损伤与未锈蚀原型结构地震损伤的关系,最后建立基于未锈蚀原型结构地震损伤的多龄期结构地震损伤模型。

Seismic Damage Model of a Multi-age Steel Frame Structure

Steel structures are light in weight, high in strength, and suitable for industrial manufacture. In China, there is currently a policy that supports the development of steel structures and their durability is gradually being addressed by designers, users, and researchers. In the design working life, even if a steel structure is maintained with an anti-corrosion coating, it is difficult to avoid corrosion as this is caused by external factors and the influence of corrosion on the performance of steel structures has become an urgent problem. Therefore, in this paper a dynamic time history analysis of multi-age (different degrees of corrosion) steel frame structures is carried out using ABAQUS software and the influence of corrosion damage is studied. The main work progressed as follows:based on the nonlinear finite element analyses from ABAQUS and using the control variable method, the main factors influencing earthquake damage in multi-age steel frames were found to be effective section shrinkage and ultimate strength degradation of the steel. Generalized corrosion damage was defined, and the relationship between corrosion damage and seismic damage in a non-corroded prototype structure explored. Finally, a multi-age structural damage model based on the earthquake damage in the non-corroded prototype structure was established.