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
引用文献：
吴琛 郑志煌 王宗成 许晓梁. 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，2023，48（12）：43-48，97.
WU Chen ZHENG Zhihuang WANG Zongcheng XU Xiaoliang. Static analysis of T-shaped steel reinforced concrete columns based on the modified steel-constrained concrete constitutive[J]. Building Structure，2023,48（12）：43-48，97.
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；
基金：福建省高校产学合作项目(2022H6032)；福州市科技计划项目(2021-P-048)。
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[3] PARK R ,PRIESTLEY M J N,GILL W D.Ductility of square-confined concrete columns[J].1982,108(4):929-950.
[4] POPOVICS S .A numerical approach to the complete stress-strain curve of concrete[J].Cement and Concrete Research,1973,3(5):583-599.
[5] EL-TAWIL S,DEIERLEIN G G.Strength and ductility of concrete encased composite columns [J].Journal of Structural Engineering,1999,125(9):1009-1019.
[6] CHEN S W,WU P.Analytical model for predicting axial compressive behavior of steel reinforced concrete column[J].Journal of Constructional Steel Research,2017,128:649-660.
[7] 秦浩，赵宪忠.高含钢率钢骨混凝土柱的滞回数值分析[J].结构工程师，2014,30(4):25-31.
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[12] 黄维，钱江，周知.考虑混凝土不同约束效应的型钢混凝土柱抗震性能模拟研究[J].工程力学，2016,33(5):157-165.
[13] 王海生.高含钢率钢骨混凝土柱滞回性能研究[D].上海：同济大学，2008.
Static analysis of T-shaped steel reinforced concrete columns based on the modified steel-constrained concrete constitutive
Abstract: T-shaped steel reinforced concrete(SRC) rectangular section column is in good agreement with the actual asymmetric force characteristics of the side column and has important engineering application value. Considering the degradation of restraint effect resulted from steel buckling, the descent section of the Mander constitutive was modified, a new constitutive model of constrained concrete was constructed and applied to the static analysis of T-shaped steel SRC column. The effects of slenderness ratio and load eccentricity ratio on the mechanical properties of the columns were discussed. The results show that the confined concrete constitutive model proposed is more in line with the actual stress-strain characteristics of steel reinforced concrete. The increase in slenderness ratio causes the T-shaped steel change from partial yield to overall yield, and the ultimate bearing capacity of the member decreases slightly. The increase in load eccentricity ratio results in a failure mode change from small eccentric compression to large eccentric compression, which leads to the reduced ultimate bearing capacity and a favorable ductility.
Keywords: T-shaped steel reinforced concrete column; confined concrete; constitutive model; slenderness ratio; load eccentricity ratio
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