框架結(jié)構(gòu)基礎(chǔ)隔震分析*
栗增欣， 董 煜
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（中國建筑科學(xué)研究院， 北京 100013）[摘要] 基礎(chǔ)技術(shù)通過設(shè)置具有較小水平剛度和較大阻尼比的隔震層來控制地震震動向上部結(jié)構(gòu)的傳播，以達到減小結(jié)構(gòu)地震反應(yīng)的目的。基礎(chǔ)隔震技術(shù)以其行之有效、簡單方便、經(jīng)濟實用等優(yōu)勢，得到了工程界的認可與歡迎。本文選取一個六層框架結(jié)構(gòu)隔震結(jié)構(gòu)為研究對象，將其簡化為單質(zhì)點隔震模型并進行了理論分析；利用ETABS對某框架結(jié)構(gòu)采用隔震支座前后進行了對比分析。結(jié)果表明：對于一般的多層隔震結(jié)構(gòu)，隔震層的水平剛度越小，上部結(jié)構(gòu)的加速度響應(yīng)減小的越多；隔震層的阻尼比越小，上部結(jié)構(gòu)的加速度響應(yīng)減小的越多，但位移反應(yīng)越大。與傳統(tǒng)抗震結(jié)構(gòu)相比，隔震結(jié)構(gòu)的自振周期有較大程度的延長，側(cè)移有較大幅度的增大，而隔震結(jié)構(gòu)的層間側(cè)移和樓層剪力有較大幅度的減??；結(jié)構(gòu)的側(cè)移主要集中在隔震層。[關(guān)鍵詞] 基礎(chǔ)隔震; ETABS; 框架結(jié)構(gòu); 反應(yīng)譜分析中圖分類號：TU375.4 文獻標識碼：A 文章編號：1002-848X(2013)S2-0395-04*中國建筑科學(xué)研究院青年科研基金：高抗震設(shè)防烈度區(qū)隔震結(jié)構(gòu)應(yīng)用研究（20122002331030114）項目資助。作者簡介：栗增欣，碩士，工程師，Email：Lee_CABR@163.com。Analysis on frame structure of base isolationLi Zengxin, Dong Yu(China Academy of Building, Beijing 100013, China)Abstract: The technology of seismic isolation, by installing isolation layer between the base and the upper structure, is used to isolate seismic energy so that it can reduce the seismic response of the structure. In all kinds of seismic isolation measures, base isolation technology is accepted and popular in the field of engineering, because of the feature simplification, facility, efficacy and economy. In this thesis, a six-story framed structure, which is simplified as single-degree-of-freedom model, is studied. The dynamic equilibrium equation of the model is established and the solution is analyzed. In addition, the response of the non-isolation structure and the base-isolation structure of the frame structure are analyzed based on ETABS finite element analysis program. Analytic results indicated that the smaller horizontal stiffness of the isolation layer, the more acceleration decreases of upper structure. And the smaller damping ratio of the isolation layer, the more acceleration decreases of upper structure and the larger displacement. Compared with the traditional seismic structure, the inherent period of base-isolation structure is extended and the story displacement and the story sheer force of the upper structure significantly decrease. And the deformation is concentrated on isolation layer.Keywords: base isolation; ETABS; frame structure; spectrum analysis
