湖南大学学报（自然科学版）2025，Vol.52Issue(5)：1-16,16.DOI:10.16339/j.cnki.hdxbzkb.2025043
装配式钢内芯-UHPC组合空心柱抗震性能研究
Investigation on Seismic Performance of a Novel Prefabricated Steel Inner Core-UHPC Composite Hollow Column
摘要
Abstract
In this paper,a novel prefabricated steel inner core-UHPC composite hollow column with a pocket connection is proposed for a novel super long-span steel-UHPC arch bridge to accommodate the span length,accelerate the construction,and reduce the self-weight and cost.The column consists of a steel inner hollow section and an exterior UHPC shell.The steel inner core can serve as the formwork of the column and provide an additional energy dissipation source.The design concept of the column and the connection details are first presented,followed by a detailed experimental program.To be specific,a 2/5-scale column was designed based on the preliminary design of the novel arch bridge and tested under the most unfavorable axial load ratio(0.24)in a pseudo-static manner to investigate the seismic performance of the proposed column,including the damage pattern,the connection performance at the interface of the prefabricated column,displacement ductility,energy dissipation capacity,stiffness degradation,residual deformation,curvature distribution and strains of the steel inner core.The test results showed that the proposed column failed in a flexural manner,including the yielding of the steel inner core and reinforced bars and crushing of the UHPC shell in the plastic hinge region;the joint remained intact and no visible crack was observed at the interface between precast and post-cast UHPC,indicating the proposed column with the pocket connection is reliable.In addition,the tested column had large equivalent damping ratios but low displacement ductility,mainly due to the mismatch between the thickness of the steel core plate and the thickness of the UHPC thin wall layer.The large axial load ratio(0.24)could be another potential cause.Moreover,the experimental results were used to validate a numerical model,on which a parameter study was performed on the novel column from the prototype bridge.The results show that the increase in the axial load ratio will result in a reduction in the ductility ratio.When the axial ratio varies between 0.05 and 0.2,the ductility coefficient of the prototype column is generally close to or larger than 3.0.The research results can provide the basis for the subsequent design and application of steel inner core-UHPC columns.关键词
钢内芯-UHPC组合柱/拱桥/抗震性能/拟静力试验/承插式连接Key words
steel inner core-UHPC composite column/arch bridge/seismic performance/pseudo-static test/pocket connection分类
交通运输引用本文复制引用
邵旭东,赵相如,伍隋文,邵宗暄,何广..装配式钢内芯-UHPC组合空心柱抗震性能研究[J].湖南大学学报（自然科学版）,2025,52(5):1-16,16.基金项目
国家自然科学基金资助项目(52250004,52308499),National Natural Science Foundation of China(52250004,52308499) （52250004,52308499）
