建筑结构学报2025，Vol.46Issue(3)：204-216,230,14.DOI:10.14006/j.jzjgxb.2024.0255
S35657不锈钢管混凝土柱压弯性能研究
Behaviour of concrete filled S35657 stainless steel tubular column under combined compression and bending
摘要
Abstract
Attribute to its high strength and low alloy cost,S35657 austenitic stainless steel is more suitable for engineering application as structural steel.However,further studies are required to investigate the effect of S35657 grade on the performance of concrete filled steel tubular(CFST)columns.Aiming to study the behavior of concrete filled S35657 stainless steel tubular(CFSST)columns under combined compression and bending,tests on 16 CFST columns were carried out with main parameters including section type(circular and square),slenderness ratio(22,26,43 and 50)and eccentricity(0,40 mm and 60 mm).The test results show no obvious difference in the failure modes of CFST columns by using S35657 stainless steel and Q355 mild steel.However,the bearing capacity of CFSST columns is about 12％higher than that of CFST columns with Q355 steel,and this value decreases with the increase of the eccentricity and slenderness ratio.Meanwhile,current design codes underestimate the bearing capacity of CFSST column with S35657 stainless steel.Finite element(FE)model was established and verified by the test results.Parametric studies were conducted using the FE model to explore the effects of the concrete strength,steel ratio and slenderness ratio on the bearing capacity of the CFSST columns with S35657 stainless steel.The results show that the stability coefficient of CFSST columns with S35657 stainless steel decrease with the growth of the slenderness ratio and the steel ratio,while concrete strength has non-significant effect on it.Moreover,the slenderness ratio,steel ratio and concrete strength have obvious influence on the relative axial load versus relative moment curves of CFSST columns with S35657 stainless steel.Based on the parametric analysis,the predictive method for bearing capacity recommended by technical specification of T/CECS 952-2021 was modified and the prediction accuracy was improved by 25％.关键词
S35657奥氏体不锈钢/钢管混凝土柱/静力试验/压弯性能/压弯承载力简化计算Key words
S35657 austenitic stainless steel/concrete filled steel tubular(CFST)column/static test/flexure and compression performance/flexure and compression simplified colculation分类
建筑与水利引用本文复制引用
余鑫,王涛,王志滨,张祖宽..S35657不锈钢管混凝土柱压弯性能研究[J].建筑结构学报,2025,46(3):204-216,230,14.基金项目
国家自然科学基金项目(51708118),福建省自然科学基金项目(2019J01234). （51708118）
