钢框架混凝土核心筒结构易损性分析

Vulnerability Analysis of Steel Frame-concrete Core Cube Structure

钢框架与混凝土核心筒变形能力差异较大,不适宜采用统一的变形指标评价其抗震性能。从构件在地震作用下是损伤程度入手,针对不同构件提出不同损伤模型,考虑各构件对结构整体损伤的影响,采用加权系数法确定构件的权重系数与重要性系数、楼层的权重系数,得到结构基于构件的整体损伤模型,并依据结构损伤程度划分极限状态。采用15条地震动记录对钢框架混凝土核心筒进行IDA分析,对比同时考虑地震动不确定性与结构不确定性时结构倒塌与非倒塌状态的易损性曲线。

Steel frame-concrete core cube structures with both advantages of steel structure and reinforced concrete structure have good energy dissipation capacity.To study damage of steel frame-concrete core cube structures under bidirectional earthquakes,according to different component damage model,the whole damage model based on component structures was obtained by using the weighted coefficient method to determine the values of the weight coefficient and the importance coefficient of the component and the floor weight coefficient,and then the damage states and corresponding damage index range of steel frame-concrete core cube structures were defined by combining the damage indexes.Vulnerability curves were compared between the collapsed and not collapsed states by considering the ground motion uncertainty and uncertainty of the steel frame-concrete core cube structure using IDA analysis with 15 ground motion input.