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（華建集團(tuán)華東建筑設(shè)計(jì)研究總院， 上海 200002）
［摘要］某多層鋼框架結(jié)構(gòu)高度約21m，結(jié)構(gòu)抗側(cè)剛度由建筑外圍的框架提供。建筑體型向外傾斜，受限于建筑效果的要求，周邊框架不能設(shè)置支撐。經(jīng)過方案比選，選擇采用基礎(chǔ)隔震形式，以減小上部結(jié)構(gòu)的地震響應(yīng)，從而降低上部結(jié)構(gòu)抗側(cè)剛度的需求，實(shí)現(xiàn)建筑結(jié)構(gòu)一體化設(shè)計(jì)。隔震層采用鉛芯橡膠支座和彈性滑板支座混合布置的形式，得到的水平向減震系數(shù)約0.5，且在風(fēng)荷載作用下隔震層保持彈性工作狀態(tài)。設(shè)計(jì)采取增大柱距等措施，保證隔震支座在罕遇地震作用下不致出現(xiàn)拔力。本工程結(jié)構(gòu)自振周期較長，合理的隔震設(shè)計(jì)取得了理想的隔震效果，對同類工程有借鑒意義。
［關(guān)鍵詞］鋼框架結(jié)構(gòu)； 基礎(chǔ)隔震； 抗側(cè)剛度； 鉛芯橡膠支座； 彈性滑板支座
中圖分類號(hào)：TU398-7， TU352.12文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)18-0109-06
Seismic isolation design and analysis of a multi-story steel framed structure shaped inclined outward
YAN Qi, BAO Lianjin, ZHU Xiaodong
(Arcplus Group PLC East China Architectural Design & Research Institute, Shanghai 200002, China)
Abstract:The height of a multi-story steel frame structure is about 21m, and the lateral stiffness of the structure is provided by the frame around the building. The structural shape is inclined outward, due to the requirements of the building aesthetic requirements, braces cannot be adopted for the outer frame. After the comparison and selection of the scheme, the base isolation form is selected to reduce the seismic response of the upper structure, thereby reducing the demand for lateral stiffness of the superstructure and realizing the integrated design of structural design and architectural design. The seismic isolation layer adopts a mixed arrangement of lead-core rubber bearings and elastic sliding plate bearings. The obtained horizontal shock absorption coefficient is about 0.5, and the seismic isolation layer maintains an elastic working state under the wind load. The design adopts measures such as increasing the column spacing to ensure that the seismic isolation support does not appear to pull out under the action of rare earthquakes. The structure of this project has a long natural vibration period, and the reasonable isolation design has achieved ideal isolation effects, which is of reference significance for similar projects.
Keywords:steel framed structure; base seismic isolation; resistant-lateral rigidity; lead-core rubber bearing; elastic sliding plate bearing
作者簡介：閆琪，碩士，工程師，Email: qi_yan@ecadi.com。
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