外包钢套加固震损型钢混凝土框架结构Pushover分析

Pushover Analysis of Seismic-damaged Steel Reinforced Concrete Frame Strengthened with Enveloped Steel Jacket

为评估震损型钢混凝土框架结构经外包钢套加固后的抗震性能,基于试验研究,采用材料弹性模量变化考虑地震损伤,运用有限元软件SAP2000对外包钢套加固震损型钢混凝土框架进行Pushover分析。通过对Pushover曲线、塑性铰、层间位移角等分析,结果表明:当试验轴压比在0. 2～0. 9范围时,试验轴压比增大使型钢混凝土框架结构层间位移角增加;外包钢套强度对结构层间位移角的影响较小;地震损伤指数达到0. 6时,与未加固框架相比,加固修复框架结构层间位移角较大,说明未达到理想加固效果。

To evaluate the seismic performance of seismic-damaged steel reinforced concrete frame strengthened by enveloped steel,considering the seismic damage by changing material elastic modulus,the Pushover analysis of seismic-damaged steel reinforced concrete frame strengthened by enveloped steel was carried out by using the finite element software SAP2000 based on the experiment.Through the analysis of Pushover curve,plastic hinge and story drift ratio,the results showed that:when the experimental axial compression ratio was within the scope of 0.2~0.9,it increased the story drift ratio of steel reinforced concrete frame structures;the enveloped steel strength had less influence on the story drift ratio;when the seismic damage reached 0.6,the story drift ratio of the strengthened frame was larger than that of the original frame,and the ideal reinforcement effect was not achieved.