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为了研究不同截面形状橡胶支座在剪切变形下的压缩刚度,该文分别基于双弹簧模型与有效面积模型推导了四种截面形状(环形、圆形、方形及矩形)支座的压缩刚度比公式,然后采用ABAQUS建立七个支座有限元模型,结合已有的支座压缩及剪切试验,验证所建立的有限元模型能够准确模拟橡胶支座的实际受力情况,在此基础上,结合理论模型对比分析了不同支座的压缩性能。分析结果表明:压缩及剪切试验中,支座刚度计算值与试验值相差均在5%以内;支座压缩刚度比只与剪切变形与截面惯性半径比值有关,与截面形状及截面尺寸大小无关;该文建立的模型及拟合刚度比公式能够有效模拟橡胶支座在不同剪切变形下的压缩刚度变化情况。
In order to study the compressive stiffness of rubber bearings with different cross-sectional shapes under shear deformation, the compressive stiffness ratios of four kinds of bearings (annular, circular, square and rectangular) were deduced based on double-spring model and effective area model respectively Formula, and then use ABAQUS to establish seven bearing finite element models. Combined with the existing bearing compression and shear tests, the finite element model verified can accurately simulate the actual bearing conditions of rubber bearings. On this basis, Comparing with the theoretical model, the compressibility of different supports is analyzed. The results show that the calculated values of the bearing stiffness are within 5% of the experimental values in the compression and shear tests. The compressive stiffness ratio of the bearing is only related to the shear deformation and the ratio of the section inertia radius, Has nothing to do; the model established in this paper and the formula for fitting stiffness can effectively simulate the rubber bearing under different shear deformation of the compression stiffness changes.