多龄期钢框架的地震易损性分析

Seismic vulnerability analysis of multi-age steel frame structures

钢材锈蚀会引起结构的抗震性能与刚度的退化,为保证结构在设计期限内完成预定功能,有必要对其抗震性能进行评估。基于ABAQUS数值模拟,结合酸性大气环境下不同锈蚀程度的钢材材性试验研究成果,建立了4个不同龄期(0年、15年、30年、45年)钢框架结构有限元模型,以PGA作为地震动强度指标,以结构最大层间位移角和结构整体损伤为地震需求指标,对模型进行了增量动力时程分析,并在增量动力时程分析结果的基础上对结构进行了多龄期钢框架结构地震易损性分析。研究成果可为钢结构的全寿命设计、既有钢结构的运营以及地震风险评估等提供理论依据。

Since steel corrosion caused the deterioration of seismic performance and stiffness of structure, it is nec- essary to make an assessment of seismic performance to ensure the structure is in use in the design reference peri- od. Based on the numerical simulation of ABAQUS, combined with the experimental achievement of material per- forinance of different corrosive steel in acidic atmosphere, 4 different finite element models （0-year, 15-year,30- year and 45-year） of steel frame structures were built. The seismic vulnerability analysis of multi-age steel frame structure was conducted on the basis of the incremental dynamic analysis that the PGA and structural maximum lat- eral displacement angle ＆ damage index were taken as the ground motion intensity index and seismic demand in- dex. The result of this research provides theoretical foundation for whole-life design of steel structure, application of current steel structure and seismic risk evaluation.