Effect of bulk compressibility on the stiffness of cylindrical base isolation bearings
Effect of bulk compressibility on the stiffness of cylindrical base isolation bearings
复制标题
体积压缩性对圆柱底座隔震支座刚度的影响
DOI：
10.1016/0020-7683(90)90004-f
复制
发表时间：
1990
影响因子：
3.6
通讯作者：
J. Kelly
中科院分区：
文献类型：
--
作者：
M. Chalhoub;J. Kelly
将建筑结构安装在水平柔性基础上的抗震设计技术正逐渐流行起来。水平方向的灵活性伴随着一个非常高的垂直刚度是很好地实现了多层弹性支座交错钢板和橡胶片。橡胶与钢硫化以确保粘合。已经提出了几种用于这种衬垫的设计表达式。然而，这些表达式要么考虑了橡胶的不可压缩性，要么通过一个适当的修正公式来考虑可压缩性。本文给出了任意截面橡胶片内压力的控制方程。该解决方案进行了圆形的形状，并与实验结果进行比较。结果发现，这些轴承的压缩刚度的公式，包括体积压缩性的影响，在这里开发的预测非常准确的测量刚度。经典的公式忽略了橡胶的压缩性，导致压缩模量的高估。Thead的修正公式给出了更接近的结果，但仍然不准确。本文给出了由精确解导出的表达式和简化形式，以代替海德修正公式和忽略橡胶压缩性的表达式。
The seismic design technique based on mounting building structures on horizontally flexible foundations is becoming popular. The horizontal flexibility accompanied by a very high vertical stiffness is well realized by multilayered elastomeric bearings made of interleaved steel plates and rubber slices. The rubber is vulcanized to the steel to ensure bond. Several design expressions for such pads were already proposed. However, these expressions either consider the rubber incompressible or they account for compressibility by anad hocmodified formula. In this paper, the governing equations for the pressure in a rubber slice of arbitrary cross section are presented. The solution is carried out for the circular shape and compared to experimental results. It was found that the formula for the compressive stiffness of those bearings developed here by including the effect of bulk compressibility predicts very accurately the measured stiffness. The classically used formula that ignores the rubber compressibility yielded exaggerated over-estimation of the compression modulus. Thead hocmodified formula gave closer results but was still inaccurate. An expression derived from the exact solution and a simplified form are herein provided to replace thead hocmodified formula and the expression that ignores rubber compressibility.