多层变厚度圆形板式橡胶支座横向刚度的研究

Study on Transverse Stiffness of Circular Laminated Rubber Bearings with Multi-Layer and Variable Thickness

板式橡胶支座具有良好的隔震性能和较小的横向刚度,从而满足了各种结构对水平方向变形的要求.在实际应用时,各类结构对板式橡胶支座的橡胶层和加劲钢板层的层数和厚度都有着不同的要求.因此,如何合理地确定板式橡胶支座的各种结构参数显得十分重要.考虑到橡胶层和加劲钢板层的层数和厚度的变化,以及在横向剪力作用下圆形板式橡胶支座的剪切变形特征,假定了一组满足边界条件的试探位移函数.利用变分原理和卡氏第二定律,推导出了横向刚度计算公式.数值分析表明,计算值与试验值吻合程度较好.

With good seismic isolation performance and smaller transverse stiffness, laminated rubber bearings can meet horizontal deformation requirements for a variety of structures. In practical applications, a variety of structures have different requirements for layers and thickness of rubber and stiffening steel plate of the laminated rubber bearings. Therefore, how to determine the structural parameters of the laminated rubber bearings is very important. Taking into account changes of layers and thickness of rubber and stiffening feature of circular laminated rubber bearings, a group satisfy the boundary conditions are assumed. By using steel plate, as well as shear deformation of trial displacement functions which the variation principle and the second Castingliano＇s theorem, the transverse stiffness formula is derived. The numerical analysis shows that the calculated and measured values are in good agreement.