建筑钢结构进展2025，Vol.27Issue(6)：1-12,12.DOI:10.13969/j.jzgjgjz.20231221001
CFRP加固承受主管轴力作用X形管节点轴压承载力试验研究
Experimental Study on Axial Compressive Bearing Capacity of Tubular X-joint Strengthened with CFRP under Preloading on Chord
摘要
Abstract
To study the axial compressive bearing capacity of tubular X-joint strengthened with carbon fiber reinforced polymer(CFRP)under preloading on chord,four tubular X-joints were tested under axial compression.The axial compressive bearing capacity,displacement and strain of the chord/brace intersection during the experiment were measured,and the failure modes,axial compressive bearing capacity,and strain development of the specimens were analyzed.A finite element(FE)model of tubular X-joint strengthened with CFRP under preloading on chord was established through finite element software ABAQUS,and the numerical simulation results were compared with the experimental results to verify the accuracy of the established FE model.Effects of initial loading percentages,diameter ratio of brace to chord,chord diameter-to-thickness ratio and number of CFRP layers on the bearing capacity of tubular X-joints were investigated.The experimental results show that CFRP sheets can effectively improve the axial compressive bearing capacity of tubular X-joint,and this enhancement becomes more significant as the number of CFRP layers increases.Compared with tubular X-joint strengthened with CFRP without preloading on chord,applying an initial loading percentage of 28%on the chord results in 3.2%reduction on the axial compressive bearing capacity of the tubular X-joint.The preloading on the chord does not change the failure mode of tubular X-joint strengthened with CFRP.The parametric analyses from finite element method indicate that the bearing capacity of strengthened tubular X-joints reduces with the increase of preloading percentage.CFRP strengthening can compensate for the reduction of bearing capacity of tubular X-joints subjected to initial axial compression.With more CFRP layers,the decrease of the bearing capacity of preloaded tubular X-joints becomes less.关键词
X形管节点/主管承载/CFRP/失效模式/轴压承载力Key words
tubular X-joint/preloading on chord/CFRP/failure mode/axial compressive bearing capacity分类
土木建筑引用本文复制引用
黄超,邵永波,欧佳灵,曹艺濒..CFRP加固承受主管轴力作用X形管节点轴压承载力试验研究[J].建筑钢结构进展,2025,27(6):1-12,12.基金项目
四川省青年科技创新研究团队项目(2019JDTD0017) （2019JDTD0017）
