【摘要】 研究目的:采用隔震技术可有效改善山地掉层框架结构的抗震性能，但山地地区常紧邻地震断裂带与大型沉积盆地，这为近断层脉冲型长周期地震动(近场型)和远场长周期地震动(远场型)的孕育提供了条件。在实际工程设计中，常常忽略长周期地震动对隔震结构的危害性，且对于长周期地震动作用下隔震结构减震性能的研究尚未完善。研究结论:(1)基于Hilbert-Huang变换(HHT)方法实现了对两类长周期地震动的特殊长周期成分的提取；(2)针对铅芯隔震掉层框架结构，将提取特殊长周期成分后的地震动的结构响应与原始地震动的响应进行对比，依据各类结构响应的改变量进一步揭示不同长周期成分对隔震框架结构的控制效应；(3)隔震框架结构在近场地震动作用下主要产生隔震垫位移过大的首次超越破坏，而在远场长周期地震动作用下除了产生较大的隔震垫位移，还需对隔震垫的能量滞回效应引起重视；(4)本研究成果可为山地建筑结构的设计提供参考。更多还原

【Abstract】 Research purposes: The isolation technology can effectively improve the seismic performance of the mountain step-terrace frame structure. However, the mountain area is usually close to the fault zones and the large sedimentary basins, which provides conditions for the breeding of near-fault pulse long period ground motions(NF type) and far-field long period ground motions(FF type).Considering the significant influence of the long period ground motion is often ignored in practical design, and the seismic performance research of isolation step-terrace structure under long period ground motion is quite lack, this paper aims to study the dynamic response characteristic of the isolation step-terrace structure under two types of long period ground motions, and clarify the damage mechanism.Research conclusions:(1) Based on Hilbert-Huang Transform(HHT) method, the special long-period components of two kinds of long-period ground motions were extracted.(2) For the isolation step-terrace structure, the structural response after earthquake with special long-period components was compared with the original ground motion response, and the control effect of different long-period components on the isolated structure was further revealed through the change of various structural responses.(3) Under the action of near-fault seismic waves, the isolated frame structure mainly produces the first transcendental failure of excessive displacement of the isolation bearing. Under the far-field long-period ground motion, in addition to the large displacement of the isolation bearing, attention should also be paid to the energy hysteretic effect of the isolation bearing.(4) The research results can provide reference for the design of mountain building structures.更多还原