大型渡槽盆式橡胶隔震支座轴向刚度研究

盆式橡胶支座用于大型、特大型渡槽结构时,支座设计时如何合理地确定其各种结构参数显得十分重要。考虑到盆式橡胶支座各组成构件的直径和厚度的变化,以及在轴向压力作用下盆式橡胶支座的压缩变形特征,利用变分原理和卡氏第二定律导出了盆式橡胶支座的轴向刚度计算公式。通过比较,计算值与实测值的吻合程度较好。

Study on axial stiffness of pot rubber isolation bearing for large-sized aqueduct

When pot rubber bearing is adopted for the structure of large-sized or supper-large aqueduct，how to determine all the structural parameters of it is apparently quite important during the design of it. Under the consideration of variations of the diameters and thicknesses of all the components of the pot rubber bearing as well as its compression deformation characteristics under the axial pressure，the calculation formula for the axial stiffness of the bearing is derived with the variational principle and Castigliano’s second theorem. Through the relevant comparison，the calculated value is better coincident with the measured one.