防灾减灾工程学报2018，Vol.38Issue(1)：14-21,8.DOI:10.13409/j.cnki.jdpme.2018.01.003
FRP约束钢筋混凝土柱中钢筋屈曲行为研究
Buckling Behavior of Steel Rebars Embedded in FRP-confined Concrete
摘要
Abstract
This paper presents an experimental investigation on FRP-confined RC columns subjected to monotonic and cyclic compressive loading.The key parameters in this study are the rupture strain of FRP,jacket stiffness,and loading scheme.Carbon and PET FRPs were chosen for comparison because they possess very different rupture strain values (CFRP＜1.5％;PET FRP ＞5％).Based on the test results,a beam-on-elastic foundation (BOEF) model is proposed for the buckling behavior of longitudinal reinforcing bars considering the lateral confining effect of FRP.Furthermore,based on the BOEF model and the test results,an empirical stress-strain model for steel rebar considering the buckling effect is developed.This model is then implemented into the OpenSees software platform and is validated through comparisons with compressive test results on cyclically loaded FRP-confined plain and RC columns.The complex mechanical interaction mechanisms among the FRP,buckling steel reinforcing bars,and the cover concrete are revealed and discussed.The proposed cyclic stress-strain model for laterally supported reinforcing bars is expected to serve as a fundamental model for predicting the seismic behaviour of FRP-strengthened RC columns.关键词
FRP/FRP约束RC柱/钢筋屈曲/OpenSeesKey words
FRP/FRP-confined RC column/bar buckling/OpenSees分类
建筑与水利引用本文复制引用
白玉磊,韩强,贾俊峰,杜修力..FRP约束钢筋混凝土柱中钢筋屈曲行为研究[J].防灾减灾工程学报,2018,38(1):14-21,8.基金项目
国家自然科学基金项目(51408136,51778019)、北京市教委科技计划面上项目(KM201610005011)、中国博士后基金项目(2016M591035)、北京市博士后基金项目(2017-ZZ-051)资助 （51408136,51778019）
