T形配钢型钢混凝土构件正截面承载力计算方法

NORMAL SECTION BEARING CAPACITY CALCULATION OF STEEL REINFORCED CONCRETE MEMBERS WITH T-SHAPED STEEL

基于塑性理论下限定理提出了T形配钢型钢混凝土构件在压、弯复合受力状态下的正截面承载力计算方法。将正截面承载力分为混凝土部分、钢筋部分和型钢部分,分析得出各部分的承载力方程,采用叠加强度法建立了T型配钢型钢混凝土构件的N-M相关曲线,并给出了相应计算公式。进行了5个1/2比例T形配钢型钢混凝土柱的低周反复加载试验,对是否配置拉结筋、不同配箍率和不同轴压力下的受力特点、破坏形态、承载能力进行了研究,其中4个试件发生了正截面受弯破坏,部分计算结果与试验数据符合较好。结果表明,所提出的计算方法简单易行,可供实际工程设计参考。

Based on lower limit principle of plastic theory, the calculation methods of normal section bearing capacity of T-shaped steel reinforced concrete column is proposed. Normal section bearing capacity can be divided into concrete part, reinforcement part and section steel part, while the normal section bearing capacity equations of each part are analyzed. N-M interrelated curves of T-shaped steel reinforced concrete column are established by using the strength superposition methods, and the corresponding formulas are given. Low-cycle reversed loading experiment of five T-shaped steel reinforced concrete columns is performed, and flexural failure occurs in four specimens. The testing parameters included shear span ratio, axial compression ratio, stirrup ratio and presence of cross tie. Mechanical process, failure mode, hysteretic characteristics, skeleton curves, ductility and energy absorption capacity are taken into comparison. Comparison was made between the calculation results and experimental data, which indicate that the proposed calculation method is simple and can provide a reference for the actual enineerin design.