钢框架-自复位SRC墙板结构的地震易损性分析

Seismic Fragility Analysis of Steel Frame Structures with Self-centering SRC Wall Panels

为了研究钢框架-型钢混凝土(SRC)自复位墙板结构的抗震性能,完成了钢框架-自复位SRC墙板子结构模型的低周往复加载试验,以研究其工作机理和失效机制。提出了基于宏观单元的非线性分析模型,并利用试验结果验证模型的准确性,研究结果表明该非线性分析模型能较好地模拟自复位SRC墙板的非线性行为。分别建立6层和15层钢框架-自复位SRC墙板结构的整体模型并进行增量动力时程分析(IDA)。以地面峰值加速度为地震动强度指标,以最大层间位移角为损伤指标,根据IDA结果得到不同极限状态下的易损性曲线,建立地震易损性矩阵,并对不同极限状态下结构的损伤风险进行了评估,研究表明:6层和15层钢框架-自复位SRC墙板结构在50年内的倒塌概率分别为0.138%和0.095%,远小于FEMA 750规定的1%,由此可见,钢框架-自复位SRC墙板结构抗震性能较好,并具备良好的抗地震倒塌能力。

In order to study the seismic performance of steel frame structures with steel reinforced concrete(SRC)self-centering wall panels,a series of cyclic tests on sub-structure model of the structures were carried out to study the working mechanism and failure mechanism.A nonlinear analysis model based on macroscopic elements was proposed,and then the test results were used to verify the accuracy of the model.The results indicated that the analysis model can well simulate the nonlinear behavior of the self-centering wall panels.Models of a 6-story and a 15-story steel frame structure with self-centering SRC wall panels were established for the incremental dynamic analysis(IDA).Taking peak ground acceleration as ground motion intensity index and maximum inter-story drift as damage index,the fragility curves of different limit states were obtained,and the fragility matrix was established according to IDA results.Then the damage risk of the structures under different limit states was evaluated.The results show that the collapse probability of 6-story and 15-story steel frame structures with self-centering SRC wall panels within 50 years is 0.138%and 0.095%,which is much lower than 1%specified by FEM A750.Therefore,the steel frame structures with self-centering SRC wall panels have a good seismic performance and collapse resistance.