建筑钢结构进展2024，Vol.26Issue(6)：45-57,13.DOI:10.13969/j.cnki.cn31-1893.2024.06.005
带球冠形脱空缺陷的圆钢管混凝土T型相贯节点的滞回性能研究
Hysteretic Performance of Circular Concrete-Filled Steel Tubular T-joints with Spherical-Cap Gap
摘要
Abstract
In order to study the influential mechanism of spherical-cap gap on the seismic performance of circular concrete-filled steel tubular(CFST)T-joints,a serial of hysteretic tests including 18 circular CFST T-joints under the combined action of constant axial tension on the CFST chord and axial cyclic loading on the brace were carried out with gap ratio,diameter ratio of brace to chord and diameter to thickness ratio of chord as the main test parameters.The effects of spherical-cap gap on the failure mode,hysteretic curve,skeleton curve,ultimate strength,stiffness and energy dissipation of circular CFST T-joints were experimentally investigated.The finite element analysis model was established,where the influence of spherical-cap gap on the contact stress between steel tube and concrete of the chord was analyzed,and a series of parametric studies were conducted to investigate the effects of gap ratio,diameter ratio of brace to chord,the diameter to thickness ratio of chord,concrete strength,steel strength and axial tension ratio on the ultimate tensile strength of circular CFST T-joints.The results show that the existence of gap tended to change the failure mode of T-joints,decrease the ultimate strength,stiffness and energy dissipation capacity of specimens to some degrees,weaken the interaction between steel tube and concrete of the chord,and affect the force transferring mechanism of the joint.Finally,a simplified formula to predict the ultimate tensile strength of circular CFST T-joints considering the effect of spherical-cap gap was proposed.关键词
钢管混凝土T型相贯节点/拉弯/滞回试验/球冠形脱空缺陷/有限元分析Key words
concrete-filled steel tubular T-joint/tension-bending/cyclic test/spherical-cap gap/finite element analysis分类
建筑与水利引用本文复制引用
张伟杰,廖飞宇,林志平,戴佩家,李艳飞..带球冠形脱空缺陷的圆钢管混凝土T型相贯节点的滞回性能研究[J].建筑钢结构进展,2024,26(6):45-57,13.基金项目
国家自然科学基金(51878176),中央引导地方发展专项(2022L3007) （51878176）
