斜向水平荷载作用下钢筋混凝土柱受剪承载力有限元分析

Finite Element Analysis on Shear Strength of Reinforced Concrete Columns Under Lateral Bevel Loads

为研究钢筋混凝土框架柱在斜向水平荷载作用下的受剪承载力和破坏机理,采用混凝土三维亚弹性正交各向异性本构关系模型(既适用于比例加载又适用于非比例加载)和旋转型弥散裂缝法(旋转裂缝垂直于主拉应变方向),应用非线性有限元法进行分析,并与试验值进行了比较.结果表明:计算值与试验结果吻合较好;斜向水平荷载作用方向对矩形截面不等肢配箍钢筋混凝土框架柱受剪承载力的影响符合椭圆规律.

The shear strength and failure mechanism of rectangular section reinforced concrete frame columns under lateral bevel loads are investigated through nonlinear finite element method. The finite element implementation is based on the hypo-elastic, orthotropic concrete constitutive model, which works with both proportional and non-proportional loads, and the smeared crack approach with rotating cracks normal to the principal tensile strain directions. The obtained results are compared with the experimental results. It shows that the numerical data are in good agreement with the experimental results. Moreover, the influences of the lateral bevel loads on the shear strength of rectangular section reinforced concrete frame columns with different transverse reinforcing bars in two different principal axes accord with the ellipse law.