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

作　　者：余鑫[1] 王涛 王志滨[1] 张祖宽 YU Xin;WANG Tao;WANG Zhibin;ZHANG Zukuan(School of Civil Engineering,Fuzhou University,Fuzhou 350108,China;Fujian Minshe Engineering Testing Co.,Ltd,Fuzhou 350007,China)

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]福建省闽设工程检测有限公司,福建福州350007

出　　处：《建筑结构学报》2025年第3期204-216,230,共14页Journal of Building Structures

基　　金：国家自然科学基金项目(51708118);福建省自然科学基金项目(2019J01234)。

摘　　要：奥氏体不锈钢S35657因高强度与低合金成本的特点而更适合用作结构钢,但其应用于钢管混凝土柱的研究有待深入。为了研究S35657不锈钢管混凝土柱压弯性能,以截面类型(圆形、方形)、长细比(22、26、43、50)及偏心距(0、40、60 mm)为主要参数,完成16根钢管混凝土柱压弯试验。结果表明:S35657不锈钢管混凝土柱的破坏模态与传统Q355碳钢柱类似,但压弯承载力较碳钢管混凝土柱提高约12%,且压弯承载力均随偏心距与长细比的增加而降低;目前既有规范(规程)对该类柱压弯承载力预测结果偏于保守。建立有限元分析模型并基于试验结果验证其适用性,继而通过验证的模型展开参数分析考察混凝土强度、含钢率和长细比对S35657不锈钢管混凝土柱承载力的影响,分析结果表明:构件稳定系数随着长细比与含钢率的增大而减小,混凝土强度对其影响不大;长细比、含钢率以及混凝土强度对相对轴力-相对弯矩相关曲线影响较大。基于参数分析结果,修正了T/CECS 952—2021《不锈钢管混凝土结构技术规程》中所推荐压弯承载力的计算方法,修正后的简化计算方法对压弯承载力的预测精度提高了约25%。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 

分 类 号：TU398.9[建筑科学—结构工程] TU317.1