黑龙江交通科技

为探究圆形板式橡胶支座与矩形板式橡胶支座在不同剪切变形条件下支座内部应力分布情况，特拟定剪切角度正切值分别为0.5、1.0、1.5、2.0四种不同剪切角，在相同竖向荷载作用下，探究支座受剪切变形后，内部各层间钢板应力分布情况，及板间橡胶主拉应力变化规律，研究结果表明：在圆形板式橡胶支座中，随橡胶板剪切角度正切值增加，中间层钢板最大范式等效应力大幅度增加，其中第4层钢板应力增幅最大，剪切角正切值为2.0时，增幅达87.2%，相同条件下，矩形支座应力增幅为57.9%；矩形板式支座应力水平均低于同剪切角条件下的圆形板式支座，当剪切角度正切值为1.0时，两种支座加劲板应力峰值均出现在第(4)层加劲板距中心点140 mm处，矩形板相较于圆形板，峰值范式等效应力降低9.7%；随剪切角度正切值增大，加劲板间橡胶的最大主拉应力基本呈现线性增长趋势，不同剪切角度正切值条件下，圆形板与矩形板橡胶最大主拉应力差值约8 MPa，且基本保持恒定。

To explore the internal stress distribution of circular plate rubber bearings and rectangular plate rubber bearings under different shear deformation conditions, four different shear angles with tangent values of 0.5, 1.0, 1.5 and 2.0 were specially proposed. Under the same vertical load, the stress distribution of the steel plates between each layer inside the bearings after shear deformation was investigated. The research results show that in the circular plate rubber bearing, with the increase of the shear angle tangent value of the rubber plate, the maximum normal equivalent stress of the middle layer steel plate increases significantly. Among them, the stress increase of the fourth layer steel plate is the largest. When the shear angle tangent value is 2.0, the increase reaches 87.2%. Under the same conditions, the increase of the rectangular bearing is 57.9%. The stress levels of the rectangular plate bearings are all lower than those of the circular plate bearings under the same shear angle conditions. When the tangent value of the shear angle is 1.0, the peak values of the stiffening plates of both bearings occur at 140 mm away from the center point of the stiffening plate of the(4) layer. Compared with the circular plate, the peak normal form equivalent stress of the rectangular plate is reduced by 9.7%. With the increase of the shear angle tangent value, the maximum principal tensile stress of the rubber between the stiffening plates almost shows a linear growth trend. Under different shear angle tangent values, the difference in the maximum principal tensile stress of the rubber between the circular plate and the rectangular plate remains almost unchanged at around 8 MPa.