水利学报2019，Vol.50Issue(4)：409-419,11.DOI:10.13243/j.cnki.slxb.20181116
GFRP增强混凝土圆柱轴压强度尺寸效应:细观分析
Size effect of axial compressive strength of circular concrete columns strengthened by GFRP:A meso-scale analysis
摘要
Abstract
Wrapping concrete columns with Fiber Reinforced Polymer/Plastic (FRP) jackets is an efficient method to strengthen its ductility. At present, the studies on the axial compressive behavior of FRP confined concrete columns are mainly based on the tests of small-sized specimens. There is lack of studies on the failure of large-sized columns, leading to the fact that the studies on the failure mechanism and mechanical properties of large-sized FRP confined concrete members are still insufficient. In the present study, a three-dimensional numerical model is established for the simulation of the failure of GFRP-confined concrete cylinder having different structural sizes, considering the heterogeneity of concrete and the interaction between GFRP and concrete. The meso-scale numerical method was verified by comparing the simulation results with the available test ones. Moreover, the influences of structural size and constraint (described by volume allocation rate of GFRP) on the failure mechanism and failure modes of concrete columns were examined. Also, the effect of constraint on the nominal compressive strength and the corresponding size effect of the concrete columns was quantitatively studied. Finally, based on the classic size effect law (SEL), a semi empirical-semi theoretical formula that can describe the influence of constraint generated by GFRP on the size effect of GFRP-confined concrete columns under axial compression was developed.Relevant experiments and simulation results confirm the rationality of the formula.关键词
GFRP混凝土柱/体积配置率/横向约束作用/轴压强度/尺寸效应Key words
GFRP reinforced concrete column/volume allocation rate/lateral constraint/axial compressive strength/size effect分类
建筑与水利引用本文复制引用
金浏,李秀荣,杜修力,樊玲玲..GFRP增强混凝土圆柱轴压强度尺寸效应:细观分析[J].水利学报,2019,50(4):409-419,11.基金项目
国家重点研发计划项目(2016YFC0701100,2018YFC1504302) （2016YFC0701100,2018YFC1504302）
国家自然科学基金项目(51822801,51421005) （51822801,51421005）
