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采用有限元方法对直径为1 500 mm隔震橡胶支座内部钢板最大应力影响因素进行分析研究,提出了相应修正计算公式.影响因素包括支座内部孔洞的大小、单层内部橡胶与钢板厚度之比(tr/ts)、内部橡胶剪切模量(G)、支座第1形状系数(S1)以及支座外保护层厚度.研究对象包括建筑及桥梁用隔震橡胶支座,荷载方法采用单向竖向加载及压剪荷载.研究结果表明,支座内部孔洞大小、tr/ts、S1对内部钢板最大应力影响较大,而G值及保护层厚度对其影响很小.提出了考虑S1影响、用以计算支座内部钢板最大应力的修正理论计算公式,并与有限元计算结果进行了对比,对比结果表明,无论是S1大的建筑隔震橡胶支座还是S1小的桥梁隔震橡胶支座,两者吻合较好.
Finite element method is used to analyze the influence factors of the maximum stress inside the steel plate with a diameter of 1 500 mm isolated rubber bearings and the corresponding correction formula is proposed.The influencing factors include the size of the holes in the support, the thickness of the rubber in the single layer and the thickness of the steel plate (Tr / ts), the internal rubber shear modulus (G), the first form factor (S1) of the support and the thickness of the outer protective layer of the support.Research objects include the isolated rubber bearings for buildings and bridges, the load method Uniaxial vertical loading and compressive shear load.The results show that the inner hole size, tr / ts, S1 has a great influence on the maximum stress of the internal steel plate, while the value of G and the thickness of the protective layer have little influence on it. S1, the theoretical formula for calculating the maximum stress of the steel plate inside the support is compared with that of the finite element method. The comparison results show that both the S1 large isolation rubber bearing and the S1 small bridge isolation Rubber bearings, the two agree well.