预应力碳纤维条带加固高轴压比混凝土圆柱抗震性能试验研究  

Experimental study on seismic behavior of circular RC columns strengthened with pre-stressed CFRP belts under high axial compression

作　　者：周长东[1,2] 田腾 吕西林[2] 白晓彬[1] 李慧[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]同济大学土木工程防灾国家重点实验室,上海200092 [3]辛广电广播电影电视设计研究院,北京100045

出　　处：《建筑结构学报》2012年第11期115-123,共9页Journal of Building Structures

基　　金：国家自然科学基金项目(50978021);同济大学土木工程防灾国家重点实验室开放基金项目(SLDRCE08-MB-01);中央高校基本科研业务费项目(2011JBM080)

摘　　要：为了研究预应力碳纤维条带加固高轴压比混凝土圆柱的抗震性能,进行了7个钢筋混凝土圆柱试件的低周反复荷载试验,其中1个为设计轴压比0.82的未加固对比柱试件,另外6个为不同高轴压比下的预应力碳纤维条带加固柱试件,主要考虑了环向预应力和轴压比两种参数对加固柱抗震性能的影响。研究结果表明:采用预应力碳纤维条带加固高轴压比混凝土圆柱后,其承载力、延性性能、耗能能力均有大幅度提升;预应力纤维条带提供的环向主动约束力能够有效抑制斜向剪切裂缝的开展,加固后高轴压比圆柱呈现出弯曲破坏特征;采用试验数据回归分析方法,得到了预应力碳纤维条带加固混凝土圆柱极限荷载点位移Δm计算式,计算结果与试验结果吻合较好。To study seismic behavior of circular RC columns strengthened with pre-stressed CFRP belts under high axial compression, seven circular RC columns including one contrast column under 0.82 axial load ratio and six columns strengthened with pre-stressed CFRP belts were tested with the main experimental parameters being the prestressing level of CFRP belts and axial load ratio. Test results show that the strength, ductility and energy dissipating capacity of the columns with high axial load ratio are improved significantly after being strengthened with pre-stressed CFRP belts. The diagonal shear cracks of columns can be effectively confining with the active lateral confining stress provided by pre-stressed CFRP belts, and the failure mechanism of the columns with high axial load ratio may show more feature of flexure with satisfactory ductility. Using statistic regression analysis, the formula of displacement △m of the peak loading point is proposed and the result of the model shows good agreement with the test result.

关 键 词：钢筋混凝土圆柱 高轴压比 预应力碳纤维条带 抗震加固 拟静力试验 延性 耗能能力 

分 类 号：TU375.3[建筑科学—结构工程] TU317.1