负载下CFRP布约束钢筋混凝土矩形柱轴心受压性能分析  

The axial compressive behavior of CFRP-confined rectangular RC columns under service loading

作　　者：熊学玉[1,2] 徐海峰[1] 李亚明[3] 

机构地区：[1]同济大学建筑工程系,上海200092 [2]先进土木工程材料教育部重点实验室(同济大学),上海200092 [3]上海建筑设计研究院有限公司,上海200041

出　　处：《土木工程学报》2010年第6期26-33,共8页China Civil Engineering Journal

基　　金：上海现代建筑设计(集团)有限公司研究课题(20061B006-结)

摘　　要：通过5个高轴压比下碳纤维约束钢筋混凝土矩形柱和1个对比柱的轴心受压试验,并结合非线性全过程分析,对试验柱的轴心受压性能、CFRP布的约束机理和柱破坏模式等试验结果进行研究。结果表明:当轴压比较大且CFRP为强约束状态时,试验柱发生弯曲破坏并表现出较好的延性,破坏时碳纤维并未拉断。结合以往的研究成果,提出轴压比与碳纤维有效环向应变的关系式,负载下CFRP约束矩形柱混凝土的抗压强度和轴向应变模型以及负载下CFRP约束矩形柱的轴压承载力计算公式,其结果在一定条件下均与试验结果符合较好。Through the test of five CFRP confined rectangular RC columns under high axial compression ratio and one reference column, combining with nonlinear analysis, the axial compressive properties of columns, CFRP confinement mechanism and failure mode are studied. The failure mode of CFRP confined rectangular columns is flexural failure and the ductility is good when the axial compression ratio is high and the constraint is strong, without CFRP rupture. Combining with our previous studies, a relational expression of axial compression ratio and CFRP hoop orientation strain, a model of compressive strength and axial strain for FRP-eonfined concrete in rectangular columns and a formula of ultimate axial compressive strength under service loading are provided, which all match favorably with the experimental results.

关 键 词：碳纤维 约束混凝土 加固 轴压比 有限元分析 

分 类 号：TU375.3[建筑科学—结构工程]