基于软化效应的型钢混凝土节点抗剪承载力计算

Calculation of Shear Capacity of SRC Joints Based on Softening Effect

根据现有试验资料,对规范YB 9082—2006《钢骨混凝土结构技术规程》和JGJ 138—2016《组合结构设计规范》中型钢混凝土节点抗剪承载力计算公式进行计算,结果表明,规范计算结果偏于保守,且离散性较大,主要原因在于混凝土项取值过于简化,导致计算结果离散性大。基于软化效应,考虑主拉方向对主压方向强度的弱化影响,对混凝土强度、配箍率、型钢约束强度、轴压比等因素的影响进行量化分析,并提出抗剪承载力计算公式中混凝土项的修正公式,结果表明,所提公式可以合理考虑各因素的影响,提高计算结果的准确性并降低离散性。

According to the existing test data,the shear bearing capacity calculation formula of medium steel concrete joints in the Technical Specification for Steel Reinforced Concrete Structures(YB 9082—2006)and the Code for Design of Composite Structures(JGJ 138—2016)are calculated.The results show that the calculation results in the code are conservative and have a large dispersion,mainly because the value of the concrete item is too simplified,resulting in a large dispersion of the calculation results.Based on the softening effect,considering the weakening effect of the main tensile direction on the strength of the main compressive direction,the influence of concrete strength,stirrup ratio,section steel restraint strength,axial compression ratio and other factors is quantitatively analyzed,and a modified formula for the concrete term in the shear bearing capacity calculation formula is proposed.The results show that the proposed formula can reasonably consider the influence of various factors,improve the accuracy of the calculation results and reduce the dispersion.