建筑钢结构进展2025，Vol.27Issue(2)：21-33,13.DOI:10.13969/j.jzgjgjz.20230918001
考虑球冠形脱空影响的圆钢管混凝土柱抗侧向冲击性能分析
Impact Behavior of Circular CFST Columns Considering the Influence of Spherical-Cap Gap
摘要
Abstract
Vehicle and ship impact accidents acting on the concrete-filled steel tubular(CFST)piers of city viaducts and river-crossing bridges occur frequently in recent years,and have become one of the most important factors that lead to the damage,destruction and collapse of structures.Nonetheless,the concrete gap imperfection is observed to commonly exist in CFST engineering practices,due to disadvantageous factors in material properties,construction and environment.While present researches are scarcely focused on the lateral impact behavior of CFST members with concrete gap imperfections.This paper established a finite element(FE)model of circular CFST column under lateral impact considering the feature of the spherical-cap gap.The influence of gap ratio,gap position,impact velocity,impact mass,boundary condition,axial compression ratio,radius-to-thickness ratio,etc.on the impact force(including the maximum Fm and equivalent Feq values),the flexural deflection(including the maximum δm and residual δr values)and the energy dissipation Ea was investigated systematically.The typical failure modes of the circular CFST column with spherical-cap gap under lateral impact was revealed,and the featured time-history curves,force spread mechanism,steel-concrete contact behavior of the circular CFST column with spherical-cap gap under the full-range lateral impact were respectively obtained,which had considered the effect of gap imperfection.The results show that the failure mode of the circular CFST column with spherical-cap gap under lateral impact still displays as the overall bending,while the degree of the tube's depression is positively related to the gap ratio.The Feq、Fm and Ea reduce with the increase of gap ratio,but the δm and δr are in an opposite trend.关键词
脱空缺陷/钢管混凝土/侧向冲击/有限元分析/破坏模式Key words
gap imperfection/concrete-filled steel tube/lateral impact/numerical analysis/failure mode分类
建筑与水利引用本文复制引用
朱维军,沈奇罕,王静峰,胡子明..考虑球冠形脱空影响的圆钢管混凝土柱抗侧向冲击性能分析[J].建筑钢结构进展,2025,27(2):21-33,13.基金项目
国家自然科学基金(52108129),博士后面上项目(2022M713388),中央高校基本科研业务费专项资金(JZ2023HGTB0260) （52108129）
