西南交通大学学报2024，Vol.59Issue(5)：1132-1139,8.DOI:10.3969/j.issn.0258-2724.20220332
FRP约束UHPC圆形短柱轴心受压性能研究
Investigation of FRP-Confined UHPC Circular Stub Columns Under Axial Compression
摘要
Abstract
In order to study the influences of the number of fiber reinforced polymer(FRP)layers,the type of FRP,and the volume of steel fiber on the axial compression performance of ultra-high performance concrete(UHPC)circular stub columns,21 FRP-confined UHPC circular stub columns were tested under axial compression.The typical failure characteristics and stress mechanism of the specimens were analyzed.In addition,the influence of various parameters on the ultimate strength and ultimate strain of the specimens was studied.The experimental results show that the ultimate strength of UHPC circular stub columns can be improved by increasing the number of FRP layers.The ultimate strength of C12,C22,and C32 is 17.8%,25.4%,and 23.4%higher than that of C11,C21,and C31,respectively.With the increase in the volume of steel fiber,the ultimate strength and ultimate strain,and the ductility of UHPC circular stub columns are improved.The ultimate strength and ultimate strain of C31 are increased by 2.9%and 15.1%,respectively,compared with C21,as well as 4.7%and 50%,respectively,compared with C11.Under the same FRP layers and volume of steel fiber,the improvement of the ultimate strength of confined UHPC circular stub columns by carbon fiber reinforced polymer(CFRP)is significantly better than that by glass fiber reinforced polymer(GFRP).The ultimate strength of C11,C12,and C13 is 9.7%,7.8%,and 7.2%higher than that of G11,G12,and G13,respectively.In view of the constraint of the steel fiber,calculation models of compressive strength and ultimate strain of FRP-confined UHPC circular stub columns are proposed.Furthermore,the constitutive model of FRP-confined UHPC is given.关键词
超高性能混凝土/纤维增强复合材料/圆形短柱/轴心抗压/应力-应变曲线Key words
ultra-high performance concrete/fiber reinforced polymer/circular stub column/axial compression/stress-strain curve分类
土木建筑引用本文复制引用
马恺泽,韩潇,何腾伟,白景柱..FRP约束UHPC圆形短柱轴心受压性能研究[J].西南交通大学学报,2024,59(5):1132-1139,8.基金项目
国家自然科学基金项目(51868073) （51868073）
