带耗能器-限位斜撑RC框架震损修复后抗震性能研究

对两榀带钢筋混凝土耗能器-限位斜撑框架的低周反复加载试验,及其复位加固后再进行的二次加载试验,以考察其残余抗震能力,得到了各种情况下构件的破坏过程、破坏特征及框架的滞回特性等。结果表明,加固后框架的水平承载能力较原型试件有所降低,但很大程度提高了框架整体的延性;复位后框架结构的残余承载力降低,但仍具有一定的抗震能力。

AN EXPERIMENTAL STUDY ON PERFORMANCES OF STRENGTHENED RC FRAMES WITH RC DAMPERS AND BRACES

Based on test of two prototype RC frames with dampers and braces under low cyclic loading,reloading experimental study is proceeded after strengthening.The reloaded strengthened frames are respectively reset to their initial positions,and test under the same load history was made to study the residual bearing capacity.Damaging process and forms of the members,as well as hysteresis behavior of the frames,are obtained in both the cases.The results show that after strengthening the horizontal bearing capacity of the frames is lower but the ductility of the whole frame is raised compared to that of the prototypes;The dampers improve the ductility of the frame to a certain extent and the lock-up braces enhance the post loading capacity of the frame,and this carries out the thinking of multi-lines resisting earthquake.Results of this paper may supply references to structure designers.The residential bearing capacity of the reset frames is decreased to a certain extent,but it still maintains some seismic performance.