损伤钢筋混凝土框架抗震加固Pushover分析

Pushover Analysis of Anti-seismic Strengthening on Damaged Reinforced Concrete Frame

基于钢筋混凝土框架模拟地震作用下的试验及有限元分析,对整体损伤钢筋混凝土框架结构采用CFRP布、角钢、钢支撑加固方法进行了推覆(Pushover)分析,对比分析加固前后钢筋混凝土框架结构屈服荷载与位移、极限荷载与位移、延性系数的变化,综合分析损伤程度及加固方法对钢筋混凝土框架加固后抗震性能的影响。结果表明,模型的塑性铰位置与试验结果基本相同;损伤的混凝土框架CFRP布加固与未损伤CFRP布加固框架相比,极限荷载、屈服位移、延性系数和试验结果基本一致;对于已经明显损伤的钢筋混凝土框架,先进行梁柱局部损伤修复加固,再采用人字形角钢进行支撑加固,效果更好。

Using the finite element Pushover analysis, we study the anti-seismic strengthening methods in- cluding CFRP cloth, angel steel and steel support reinforcement on damaged frame structure under earth- quake simulation test. The changes of ultimate load and displacement, yield load and displacement, ductili- ty coefficient before and after the reinforcement of reinforced concrete frame structure are contrasted, and the affects of damage degree and strengthening plans to the anti-seismic ability of strengthening concrete frame are analyzed. The result shows that the place of the plastic hinge is basically as same as that of the test result; When using the CFRP cloth, ultimate load and displacement, yield load and displacement, ductility coefficient result of the strengthened damaged concrete frame and that of the undamaged concrete frame are basically consist with each other, while for the damaged reinforced concrete frame, repairing the local damage of beam strengthening the beam firstly and then strengthening the frame using chevron angle iron, the effect is better.