长江大学学报（自然科学版）2026，Vol.23Issue(1)：105-115,11.
高温骤冷后不同截面高强钢管超高性能混凝土约束效应分析
Cooling analysis of the confinement effect in ultra-high performance concrete-filled high-strength steel tubes with different cross-sections after thermal shock
摘要
Abstract
Firefighting water spray significantly affects the material and mechanical properties of high-strength steel tube ultra-high performance concrete(UHPC)structures.To investigate the evolution of axial compression behavior in high-strength steel tube UHPC columns after high-temperature exposure and water quenching,an experimental and finite element analysis was conducted on 12 square and circular UHPC-filled steel tube columns subjected to different temperatures.Axial compression tests were performed to analyze failure modes,load-displacement curves,ductility,and axial compressive capacity.Furthermore,the confinement effects of the two cross-sectional types were compared under conditions of equal steel ratio and equal cross-sectional area.Results indicate that after high-temperature exposure and water quenching,the peak load-bearing capacity initially increases and then decreases,with 400℃serving as the critical threshold.Under identical conditions,circular specimens demonstrate superior load-bearing capacity,ductility,and post-failure performance compared to square specimens,attributable to their uniform circumferential confinement.These findings provide valuable references for structural design and post-fire performance assessment.关键词
高温骤冷/高强钢管/UHPC/轴压性能/约束效应Key words
high-temperature rapid cooling/high-strength steel tube/UHPC/axial compression performance/constraint effect分类
建筑与水利引用本文复制引用
杜国锋,饶杰,袁洪强..高温骤冷后不同截面高强钢管超高性能混凝土约束效应分析[J].长江大学学报（自然科学版）,2026,23(1):105-115,11.基金项目
国家自然科学基金项目"高强钢管超高性能混凝土地震损伤机理及抗震性能调控研究方法"(52078052). （52078052）
