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建立了考虑支座竖向变形以及上部结构转动时隔震结构的运动方程,研究了近场地震作用下结构高宽比和隔震结构周期对支座破坏形式的影响;提出了利用支座软碰撞和软提离防护支座在强烈近场地震作用下发生破坏的措施;对不同类型的橡胶缓冲挡块的力学性能进行了试验研究,并利用有限元软件对其进行了理论计算,给出了橡胶缓冲挡块的荷载-位移关系表达式;对具有软提离功能的支座,根据所需提离量的大小,设计了支座的具体构造.以某高层隔震结构的8度地震响应分析为例,验证了当支座具有软碰撞和软提离功能时,虽然支座的竖向位移有很多的增加,但支座所受的竖向拉压应力以及底层柱的剪力均有很大的减小.
The equations of motion of the isolated structure considering the vertical deformation of the support and the superstructure are established. The effect of the structure aspect ratio and the isolation structure period on the failure modes of the support under the action of near-field earthquakes is studied. Collision and soft lift off the support in strong near-field earthquake under the action of damage measures; different types of rubber buffer stop mechanical properties of a pilot study and the use of finite element software for their theoretical calculations given The expression of the load-displacement relationship of the rubber buffer stop is proposed.For the bearing with soft lift function, the specific structure of the bearing is designed according to the required lifting distance.With a 8-degree earthquake of a high-rise seismic isolation structure In the case of response analysis, it is verified that although the vertical displacement of the support increases a lot when the support has the function of soft collision and soft lifting, the vertical tensile and compressive stress of the support and the shear force of the bottom column There is a big reduction.