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针对长周期结构隔震效果较差的问题,提出了在普通隔震层附加负刚度阻尼装置(NSD)的新型隔震系统,并讨论了NSD对隔震体系性能的影响.首先,通过推导和讨论NSD隔震体系的自振频率、阻尼比和动力放大系数,指出该隔震系统可以显著延长结构自振周期和增加结构阻尼比,较适合长周期结构隔震.然后,采用ANSYS有限元软件分析了铅芯橡胶支座(LRB)隔震体系、隔震橡胶支座(LNR)与NSD并联隔震体系的地震反应,结果表明后者的各种反应均比前者要小,对层间位移和柱底剪力降低更明显,并且LNR隔震层附加负刚度比不超过-0.30的NSD可以获得较好的隔震效果,更易实现长周期结构的隔震目标.
Aiming at the problem of poor isolation effect of long-period structure, a new type of isolation system with negative stiffness damping device (NSD) is put forward and the effect of NSD on the performance of isolation system is discussed.Firstly, The natural frequency, damping ratio and dynamic amplification factor of NSD isolation system are discussed. It is pointed out that the isolation system can significantly prolong the natural period of the structure and increase the damping ratio of the structure, which is more suitable for long-period structural isolation. Then, using ANSYS finite element software The seismic responses of LRB isolation system, LNR isolation and NSD parallel isolation system are analyzed. The results show that the latter response is smaller than the former, And the column bottom shear reduction is more obvious, and the additional negative stiffness ratio of LNR isolation layer less than -0.30 NSD can get better isolation effect, easier to achieve the long-period structure of the isolation target.