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近年来,在基础隔震中将叠层橡胶垫放置于地下室混凝土柱顶的串联隔震形式被大量应用,这样有利于地下空间利用,然而,在地震作用下,叠层橡胶支座既承受竖向重力荷载又承受水平和竖向地震作用,同时还受下端约束的影响,在这种情况下,叠层橡胶支座的受力与变形必然受到影响。针对这个问题,对三种串联隔震体系进行了有限元模拟。对比计算结果表明,混凝土柱刚度对于叠层橡胶支座的应力和变形影响较为明显,刚度越大叠层橡胶支座下端转角越小,达到塑性应力时位移越大。
In recent years, a series of isolated seismic isolation systems in which the laminated rubber mats are placed on the top of concrete columns in basement isolation are used in large quantities, which is beneficial to the utilization of underground space. However, under earthquake, the laminated rubber bearings are not only subject to vertical Gravity load is also subject to horizontal and vertical seismic effects, but also by the lower end of the constraint, in this case, the laminated rubber bearing force and deformation will inevitably be affected. In response to this problem, three kinds of series isolation system were simulated by finite element method. The results of comparison show that the stiffness of concrete column has obvious influence on the stress and deformation of laminated rubber bearing. The larger the stiffness is, the smaller the angle of the lower end of the laminated rubber bearing is, and the greater the plastic deformation is.