中文摘要：

采用MTS伺服加载系统对6根自密实混凝土加固柱和2根对比柱进行二次受力下拟静力试验,对比试件分别为普通混凝土加固柱及未加固柱。研究不同初始受力和自密实混凝土强度对加固柱抗震性能的影响,并与普通混凝土加固柱进行比较。通过对试件破坏过程、荷载位移滞回曲线等试验结果的分析得到：采用自密实混凝土增大截面法加固钢筋混凝土柱,其抗震性能优于普通混凝土加固柱,新老混凝土的协同工作性好;考虑初始受力的影响,加固柱的极限承载力、极限位移、位移延性系数等都会降低,且降低的程度随初始应力水平的增大而增大,在加固设计中应予以考虑。

英文摘要：

To investigate the effects of initial stress level and the strength of self-compacting concrete （SCC） on seismic behavior of columns, six concrete columns strengthen with SCC and two comparative columns were designed for low cyclic reversed loading tests. The initial stress level is 0.35, 0.5 and 0.75 respectively. Based on experimental studies on the failure process of columns and the stress-strain relationships of concrete and hysteresis curves of specimens, the co-operational performance of new-old concrete was presented. The bearing capacity, ductility and ductility factor decrease with the increasing of initial stress level.