分段SFC预制壳壁抗震加固RC墩柱的效能研究  

A study on the efficiency of RC pier seismic strengthened by precast SFC shell segments

作　　者：孟庆利[1] MENG Qingli(School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,China)

机构地区：[1]西南科技大学土木工程与建筑学院,四川绵阳621010

出　　处：《振动与冲击》2018年第4期19-27,共9页Journal of Vibration and Shock

基　　金：四川省教育厅项目(14ZD1111);西科大博士基金(13ZX7144);国家自然科学基目(50808163;51278471)

摘　　要：针对国内外强震作用下钢筋混凝土桥梁RC桥墩震损普遍存在的问题,在消化和吸收国内外已有RC墩柱抗震加固成果的基础上,研制开发一种了新型RC墩柱抗震加固措施-RC墩柱塑性铰区域外包分段钢纤维混凝土(Steel Fiber Concrete,SFC)预制壳壁,选取实际桥梁中的RC桥墩为原型,通过加固前后模型RC桥墩伪静力对比试验研究,校验这种新型RC墩柱抗震加固措施的有效性,试验结果表明新型RC墩柱抗震加固措施能在不改变RC桥墩塑性铰位置的前提下实现承载力和耗能能力的提高。此外,选取不同场地条件下的典型地震动,进行实验RC墩柱加固前后的非线性地震时程反应对比分析,进一步验证新型抗震加固措施的加固效能。Seismic damage of reinforced concrete bridges’RC piers under strong earthquake is often encountered.Based on the results of existing piers/columns seismic strengthening research,a new-type RC piers/columns seismic strengthening strategy-Precast SFC shell segments wrapping the plastic hinge region of RC piers/columns was developed.Then,the RC piers in the actual bridge were selected as a prototype.The validity of the RC piers/columns seismic strengthening strategy was studied by comparative experimental study of the RC piers and the strengthened RC piers in the pseudo static tests.The experimental results show that the RC/columns pier seismic strengthening strategy can enhance the bearing capacity and energy dissipation capacity of RC piers without changing their plastic hinge position.In additional,the nonlinear seismic time history response of the experimental RC piers reinforcement was analyzed and compared under typical ground motion in different site conditions,which further verified the effectiveness of the new-type seismic strengthening strategy.

关 键 词：RC墩柱 分段SFC预制壳壁 抗震加固 伪静力试验 加固效能 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3