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中文摘要：
为全面了解设置预应力箍板（PSJ）RC柱抗震性能,进一步研究施加横向预应力构件受力机理,建立PSJ-RC柱有限元模型,以剪跨比、轴压比、预应力度以及箍板用量为主要参数,开展弹塑性数值模拟。分析其破坏形态、承载力和变形能力,并进行不同轴压比、预应力度试件的试验验证。设置PSJ能够有效提高试件抗剪承载力,明显改善试件变形能力,尤其对高轴压比柱抗震性能的提高。增加预应力度能提高试件位移延性,预应力度宜控制在0.3―0.5,低于0.15可能导致箍板参与抗剪和横向约束作用降低,箍板配置参数在0.75―1.0能够最大发挥材料效能。设置PSJ能有效提高RC柱抗震性能,施工工艺简单、可行,可供工程实践参考。
英文摘要：
This paper introduces a prestressed steel jacket （PSJ） strategy to retrofit RC columns with rectangular section for enhanced shear strength and improved ductility. Numerical simulation and cyclic loading test were carried out to evaluate the seismic behavior of the RC columns retrofitted by PSJ, and the transfer mechanism between PSJ and RC columns was analyzed. The examined parameters were shear span, axial compression ratio, steel jacket and prestressing level of PSJ. Based on the results of numerical simulation and cyclic loading test, it was concluded that the shear strength of the retrofitted columns were enhanced effectively and their displacement ductility ratio were improved significantly. In addition, the strengthening effect on seismic behavior was investigated and its applicable range was proposed.
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