(1 福建工程学院福建省土木工程新技术与信息化重点实验室, 福州 350118; 2 福建建工集团有限责任公司, 福州 350003; 3 同济大学建筑设计院 (集团) 有限公司, 上海 200092)

摘要: T 形配钢型钢混凝土(SRC)矩形截面柱能较好地符合边柱实际非对称受力特征,具有重要的工程应用价值. 考虑型钢压屈约束效应退化,修正 Mander 本构模型的下降段,构造约束混凝土受压本构新模型,并将修正的本构模型应用于 T 形配钢 SRC 柱的静力分析,讨论长细比和荷载偏心率对柱受力性能的影响. 结果表明,修正后约束混凝土本构模型较符合型钢混凝土实际应力-应变特征;长细比的增大使 T 形钢由局部屈服转变为整体屈服,构件极限承载力略有降低;荷载偏心率的增大使 T 形配钢 SRC 柱由小偏心受压破坏发展为大偏心受压破坏,构件极限承载能力降低,但延性保持良好.

关键词: T 形配钢型钢混凝土柱; 约束混凝土; 本构模型; 长细比; 荷载偏心率

中图分类号:TU398. 9 文献标志码:A 文章编号:1002-848X(2023)12-0043-06

DOI:10. 19701 / j. jzjg. 20201448

Static analysis of T-shaped steel reinforced concrete columns based on the modified steel-constrainedconcrete constitutive

WU Chen1, ZHENG Zhihuang1, WANG Zongcheng2, XU Xiaoliang3

(1 Fujian Provincial Key Laboratory of Advanced Technology and Information in Civil Engineering , Fujian Universityof Technology, Fuzhou 350118, China; 2 Fujian Construction Engineering Group Co. , Ltd. , Fuzhou 350003;3 Tongji Architectural Design (Group) Co. , Ltd. , Shanghai 200092)

Abstract:T-shaped steel reinforced concrete ( SRC) rectangular section column is in good agreement with the actualasymmetric force characteristics of the side column and has important engineering application value. Considering thedegradation of restraint effect resulted from steel buckling, the descent section of the Mander constitutive was modified, anew constitutive model of constrained concrete was constructed and applied to the static analysis of T-shaped steel SRCcolumn. The effects of slenderness ratio and load eccentricity ratio on the mechanical properties of the columns werediscussed. The results show that the confined concrete constitutive model proposed is more in line with the actual stressstrain characteristics of steel reinforced concrete. The increase in slenderness ratio causes the T-shaped steel change frompartial yield to overall yield, and the ultimate bearing capacity of the member decreases slightly. The increase in loadeccentricity ratio results in a failure mode change from small eccentric compression to large eccentric compression, whichleads to the reduced ultimate bearing capacity and a favorable ductility.

Keywords:T-shaped steel reinforced concrete column; confined concrete; constitutive model; slenderness ratio; loadeccentricity ratio

∗福建省高校产学合作项目(2022H6032),福州市科技计划项目(2021-P-048).

第一作者:吴琛,博士,教授,博士生导师,主要从事组合结构抗震设计与性能研究,Email:wuchen2001@ 126. com.

[引用本文] 吴琛,郑志煌,王宗成,等. 基于修正型钢约束混凝土本构的 T 形配钢型钢混凝土柱静力分析[ J].建筑结构,2023,53(12):43-48,97. WU Chen ,ZHENG Zhihuang,WANG Zongcheng,et al. Static analysis of T-shapedsteel reinforced concrete columns based on the modified steel-constrained concrete constitutive [ J]. Building Structure,2023,53(12):43-48,97.