- 摘 要
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杜永峰1, 2，劉勇1，包超1，祁磊1
（1 蘭州理工大學防震減災研究所, 蘭州 730050；
2 蘭州理工大學西部土木工程防災減災教育部工程研究中心, 蘭州 730050）
［摘要］搖擺架減震框架結(jié)構(gòu)是在原RC框架結(jié)構(gòu)上增設輕型搖擺鋼架而成。依據(jù)我國抗震規(guī)范設計了一棟抗震設防烈度為8度的6層RC框架結(jié)構(gòu)及輕型搖擺鋼架，對搖擺架減震框架結(jié)構(gòu)的抗震性能進行了研究。利用OpenSees軟件建立RC框架以及輕型搖擺鋼架有限元模型，并對該模型進行靜力彈塑性分析，分別從荷載-位移曲線、能力譜、性能點和層間位移角四個角度分析了搖擺架減震框架結(jié)構(gòu)的抗震能力。結(jié)果表明：搖擺架能夠有效分擔原結(jié)構(gòu)的基底剪力，在相同的頂點位移下，使原結(jié)構(gòu)的承載力提高37%左右；增設搖擺架對原結(jié)構(gòu)彈性狀態(tài)下的剛度及周期影響較小，而當結(jié)構(gòu)進入塑性階段后，該搖擺架可以增加結(jié)構(gòu)剛度并降低結(jié)構(gòu)響應；在7度和8度罕遇地震作用下，原結(jié)構(gòu)產(chǎn)生較大的層間位移角并且出現(xiàn)層屈服機制，利用搖擺架后不僅能夠降低結(jié)構(gòu)的響應，而且可以使結(jié)構(gòu)保持在整體屈服機制下。
［關鍵詞］搖擺架； 性能分析； Pushover分析； 層間位移角； 屈服機制
中圖分類號：TU352.1，P315.92文獻標識碼：A文章編號：1002-848X(2016)01-0059-05
Pushover analysis of frame structure with rocking frame
Du Yongfeng1, 2， Liu Yong1， Bao Chao1， Qi Lei1
(1
2 Western
Technology,
Abstract:Frame structure with rocking frame consists of the initial RC frame structure with additional light-weight rocking steel frame. A 6-story RC frame structure installed with the light-weight rocking steel frame in area of 8 degree seismic fortification intensity was designed in accordance with the seismic design codes. The seismic behavior of the energy-dissipated frame structure with rocking frame was studied. The finite element models of RC frame structure and light-weight rocking steel frame were established by OpenSees software, and Pushover analysis was conducted. The seismic capacity of the energy-dissipated frame structure with rocking frame was analyzed in four perspectives of load-displacement curve, capacity spectrum, performance point and inter-story drift angle. The results show that rocking frame can effectively share base shear of the initial frame and improve the bearing capacity of the initial frame by about 37% under the same top displacement. Rocking frame has little effect on stiffness and period of the initial structure in elastic state and it can enhance the structure stiffness and decrease structural responses of initial frame when entering the plastic state. Rocking frame can decrease the structural responses and can also control the overall yielding mechanism as the yielding mechanism of the structure, considering the fact that initial structure has large inter-story drift angles and occurrence of layer yielding mechanism under the 7 degree and 8 degree rare earthquake actions.
Keywords:rocking frame; performance analysis; Pushover analysis; inter-story drift angle; yielding mechanism
*國家自然科學基金項目資助（50978130，51178211）。
作者簡介：杜永峰，教授，博士生導師，Email：liuyongviva@163.com。
