中文摘要：

研究了0%,50%和100%的3种再生骨料替代率下,再生混凝土的基本物理和力学性能,分析了钢骨再生混凝土短柱的高温性能及其加固行为,得到了不同再生骨料替代率、不同温度和CFRP加固下钢骨再生混凝土的承载力、位移和应变响应,建立了高温后（500℃）钢骨再生混凝土短柱弹性模量和抗压强度之间的理论关系。结果表明：在CFRP加固下,替代率为50%的试件具有最大的承载力,温度升高,试件承载力急剧降低,而CFRP加固能有效提高试件的承载力、刚度,延性有所降低,其破坏模式比未加固试件有明显改变。

英文摘要：

This paper studied the basic physical- mechanic behavior of recycled concrete with three recycled coarse aggregate（ RCA） replacement ratios of 0%,50% and 100% and analyzed the high temperature behavior and strengthening performance of the steel rib recycled concrete short column. Bearing capacity,displacement and strain responses of steel rib recycled concrete with different recycled aggregate replacement ratios,different temperatures and CFRP strengthening were obtained,and theoretical relationship between elastic modulus and compressive strength of steel rib recycled concrete short column was established. Results show that,after strengthening with CFRP,the specimen with 50% RCA replacement ratio has the maximum bearing capacity; the bearing capacity decreases rapidly with temperature rise; CERP strengthening may raise bearing capacity,stiffness and decrease the ductility,while the failure mode changes obviously comparing with non- CERP- strengthened specimen.