CFRP板侧面加固钢筋混凝土梁的抗弯性能试验  

Experiment on flexural behavior of RC beam strengthened with CFRP plate

作　　者：於永和[1] 张鹏[1] 莫测先[1] 李冰[1] 韦永乐[1] 蒙文流[2] 韦树英[2] 

机构地区：[1]广西工学院土木建筑工程系,广西柳州545006 [2]广西大学土木建筑工程学院,南宁530004

出　　处：《桂林工学院学报》2006年第3期353-357,共5页Journal of Guilin University of Technology

基　　金：广西自然科学基金资助项目(桂科自0481004);柳州市科技开发项目(20050422)

摘　　要：对CFRP板侧面加固混凝土梁的受弯性能进行了试验,分析了碳纤维板加固面积、加固位置、配筋率等参数对加固梁受弯性能的影响,结果表明:使用碳纤维板加固钢筋混凝土受弯构件,可以显著提高其受弯承载力和抗弯刚度,但两者之间并不成正比,CFRP板的用量有一个最佳值;混凝土强度的提高对加固效果的影响不显著,但配筋率的变化对加固效果有较大的影响,低配筋率的梁使用CFRP板加固后承载力的提高幅度要比高配筋率的梁显著;由于CFRP板的弹性模量比钢筋的弹性模量小,加固梁破坏时的挠度仍较大.建议在实际工程中应尽量采用弹性模量高、厚度小的CFRP板,并保证其锚固长度.The experiment is made for the flexural behavior of RC beam strengthened with CFRP plate. Some parameters such as strengthening area of CFRP plate, strengthening place, rate of bar arrangement could affect the flexural behavior of RC beam strengthened with CFRP plate. The results indicate that the carrying capacity of RC flexural member can be increased, and the flexural stiffness is also increased. But the carrying capacity and flexural stiffness do not change with the number of CFRP plate in direct ratio, and there is an optimal value to the number of CFRP plate. The increase of concrete strength affects strengthening, but the change of rate of bar arrangement affects strengthening apparently. The increase scope of carrying capacity to low rate of bar arrangement beam is bigger than that to high percentage of reinforcement beam . Because elastic modulus of CFRP plate are weaker than elastic modulus of steel bar, while strengthening beam is destroyed, the deflection is still strong. It is suggested that thin CFRP plate be used with high elastic modulus, meanwhile there is enough anchor length.

关 键 词：碳纤维板(CFRP板) 加固 混凝土梁 受弯性能 

分 类 号：TU323.302[建筑科学—结构工程] TU375.1