低温环境下圆不锈钢管UHPC组合柱压弯性能研究  

Study on eccentric compression performance of ultra-high performance concrete-filled stainless steel tube composite columns in low-temperature environments

作　　者：严加宝[1] 王子瑞 罗云标 YAN Jiabao;WANG Zirui;LUO Yunbiao(School of Civil Engineering,Tianjin University,Tianjin 300354,China)

机构地区：[1]天津大学建筑工程学院,天津300354

出　　处：《建筑结构学报》2025年第2期132-140,共9页Journal of Building Structures

基　　金：国家自然科学基金项目(52478195);黑龙江省重点项目(ZD2022E009)。

摘　　要：为研究低温环境下圆不锈钢管超高性能混凝土(UFCSST)组合柱压弯性能,开展了低温(-60、20℃)下16根UFCSST短柱轴压与偏压试验。结果表明:当环境温度由室温降至-60℃时,UFCSST柱轴压承载力和初始刚度分别提高30.8%和27.2%,但延性降低6.0%;随偏心率增大,UFCSST柱破坏模式逐渐由受压转变为受弯破坏主导。通过试验结果与国内外规范预测值对比发现,采用Eurocode 4与AISC 360-16中相关公式对UFCSST柱压弯承载力预测结果偏保守,而采用GB50936—2014的预测结果偏不安全。鉴于不锈钢具有明显应变强化特征,提出了考虑不锈钢应变强化特性和UHPC受拉性能的理论分析模型,计算结果与试验结果吻合良好。To study the eccentric compression performance of ultra-high performance concrete-filled stainless steel tube(UFCSST)columns,axial and eccentric compression tests on 16 UFCSST stub columns at different temperatures(-60℃,20℃)were conducted.The research indicates that reducing the environmental temperature from room temperature to-60℃increases the axial compressive capacity and initial stiffness of UFCSSTs by 30.8%and 27.2%,but decreases the ductility by 6.0%.As the eccentricity increases,the failure mode of UFCSST columns gradually changes from compression-dominated to flexure-dominated.Based on a comparison between experimental results and predicted values from domestic and international standards,it is found that the relavant formulas in Eurocode 4 and AISC 360-16 provide conservative predictions of the compressive-bending capacity of UFCSST columns,while the predictions from GB 50936—2014 are found to be unsafe.Considering the pronounced strain-strengthening characteristics of stainless steel,a theoretical analysis model was proposed that accounted for both the strain-strengthening behaviour of stainless steel and the tensile behaviour of UHPC.The calculated results show good agreement with experimental results.

关 键 词：钢管混凝土 超高性能混凝土 不锈钢 低温 偏心受压 

分 类 号：TU398[建筑科学—结构工程]