配置高强钢筋混凝土框架结构的地震易损性分析

Seismic vulnerability analysis of high strength reinforced concrete frame structures

为研究地震作用下配置不同高强钢筋的混凝土框架结构的地震易损性,得到预测结构倒塌概率的数学模型。基于SAP2000,分析了7度、8度设防烈度区共6种混凝土框架结构模型在13条地震动记录下的地震非线性时程分析,得到不同设防烈度区内的多条地震易损性曲线,对IDA曲线回归分析得到极限状态下的失效概率公式和抗倒塌储备系数。结果表明:IDA曲线发散性与地震震动强度成正相关,高强钢筋强度与结构IDA曲线的发散性在同一地震动强度内成负相关;同一设防烈度下,结构的抗倒塌储备系数随着钢筋强度的增加而增大,结构的倒塌概率越小。

In order to study the seismic vulnerability of concrete frame structures with different high-strength steel bars under earthquake,get a mathematical model for predicting the collapse probability of structures.Based on SAP 2000,writers analyzed the seismic non-linear time-history analysis of 6 kinds of concrete frame structure models in 7-degree and 8-degree fortification intensity zones under 13 seismic records and obtained several seismic vulnerability curves in different fortification intensity regions.The failure probability formula and collapse resistance reserve coefficient under limit state are generate by regression analysis of IDA curve.The results show that the divergence of IDA curve is positively correlated with seismic vibration intensity,and the divergence of IDA curve is negatively correlated with the strength of high-strength steel bar in the same earthquake intensity.Under the same fortification intensity,the reserve coefficient of collapse resistance of the structure increases with the increase of the strength of steel bar,and the collapse probability of the structure decreases.