摘要
预应力CFRP布加固RC箱梁受到预应力及外荷载共同作用时,其界面粘结剪应力可由预应力单独作用阶段和外荷载作用阶段两者叠加而得.基于破坏力学概念,对预应力单独作用阶段界面剪应力传递情况进行分析,推导了界面剪应力计算公式,并通过有限元对CFRP布加固RC箱梁做了数值实验验证,探讨了初始预应力大小、CFRP布厚度和CFRP布弹性模量对界面剪应力的影响.
The CFRP strengthened RC box beams are forced by the prestress and external loads together, the in-terfacial shear stress is the superposition of the prestress and external loads. In this paper, formulation of the in-terfacial shear stress of RC box beams strengthened by CFRP sheet under prestressing were deduced based on the concept of fracture mechanics. Then,by means of finite element method, numerical experiments were carried out to reveal the effects of initial prestress,CFRP sheet thickness and the elastic modulus of CFRP sheet on the in-terfacial shear stress.
出处
《兰州工业学院学报》
2017年第4期5-8,13,共5页
Journal of Lanzhou Institute of Technology
关键词
RC箱梁
界面剪应力
预应力
CFRP布
加固
RC box beam
interfacial shear stress
prestress
CFRP sheet
strengthening
