中文摘要：

提出一种采用预应力钢板箍对钢筋混凝土矩形截面柱进行抗震加固的方法。进行9个采用预应力钢板箍加固的高轴压比RC短柱试件的低周反复加载试验。主要研究轴压比n、箍板特征值η、预应力水平α等参数对采用预应力钢板箍加固技术加固混凝土矩形截面柱的抗震性能的影响。通过试验检验了加固试件的破坏形态、强度、变形能力、滞回特性和耗能能力等重要抗震性能指标。结果表明,采用预应力钢板箍加固可大幅改善高轴压比RC短柱的抗震性能;加固柱的抗震性能和变形能力随着箍板配置特征值和预应力水平的增大而增大,随轴压比的增大而减小。横向预应力钢板箍能够有效抑制斜向剪切裂缝的开展,将试件的破坏形态由剪切破坏转变成具有较好延性的弯曲破坏。该加固技术克服了以往框架柱抗震加固存在的明显缺点,可最大限度地改善加固构件的抗震性能,是一种具有广泛应用前景的抗震加固方法。

英文摘要：

A technique for retrofitting reinforced concrete （RC） columns using prestressed steel jacket （PSJ） was investigated. Nine 0.5-scale short RC column specimens were tested under cyclic loading and constant axial load,with the main experimental parameters being axial compression ratio,configuration index of PSJ,and prestressing level of PSJ. Based on the test results,the failure mechanism,strength,ductility,hysteretic behavior,and energy dissipation capacity were examined. The results show that the seismic performance of the retrofitted specimens could be effectively enhanced even if the axial compression ratio of specimen reaches 0.56. The ductility index and the energy dissipation capacity of the retrofitted specimens increase with the configuration index and/or the prestressing level of PSJ. The failure mechanism of the short column retrofitted by PSJ might change from shear to flexure with satisfactory ductility. The results indicated that the presented retrofitting technique is an ideal method for RC columns with substandard design and promises wide applications.