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（中國建筑西南設(shè)計研究院有限公司， 成都 610042）
［摘要］川投西昌綜合醫(yī)院項目位于9度區(qū)近斷層，建筑體型復(fù)雜，上部結(jié)構(gòu)豎向及平面不規(guī)則。為提高結(jié)構(gòu)的抗震性能，在基礎(chǔ)頂部設(shè)置隔震層，隔震層由鉛芯橡膠支座、疊層橡膠支座、黏滯阻尼器和彈性滑板支座組成； 隔震層以上采用框架-剪力墻結(jié)構(gòu)。介紹了考慮1.5的近場地震增大系數(shù)后該工程的結(jié)構(gòu)設(shè)計及隔震設(shè)計。隔震分析結(jié)果表明，結(jié)構(gòu)水平地震減震系數(shù)為0.367，上部結(jié)構(gòu)水平地震作用可按降低一度設(shè)計； 罕遇地震下隔震支座的面壓、水平位移等參數(shù)能夠滿足規(guī)范要求。結(jié)構(gòu)性能化分析結(jié)果表明，隔震后的結(jié)構(gòu)抗震性能得到提高，能滿足抗震性能目標(biāo)C的要求。加強(qiáng)了隔震溝擋土墻的設(shè)計，使得高11.7m的懸臂擋土墻滿足大震彈性的要求。
［關(guān)鍵詞］基礎(chǔ)隔震； 黏滯阻尼器； 近斷層； 性能化設(shè)計； 懸臂擋土墻
中圖分類號：TU318文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2020)19-0077-06
Design of a complex high-rise isolation structure in 9-degree zone
WU Xiaobin, PENG Zhizhen, CAO Li, HAN Keliang
（China Southwest Architectural Design and Research Institute Co.， Ltd., Chengdu 610042, China）
Abstract:Sichuan Investment Xichang General Hospital Project is located in the 9-degree zone near the fault, with complex building shape and irregular vertical and plane. In order to improve the seismic performance of the structure, an isolation layer is set on the top of the foundation, the isolation layer consists of lead rubber bearing, laminated rubber bearing, fluid viscous damper and elastic slide bearing； the frame-shear wall structure is adopted for the structure above the isolation layer．The structural design and isolation design of the project after considering the near-field seismic amplification factor of 1.5 were introduced. The isolation analysis results show the horizontal seismic decrease coefficient is 0.367，so the intensity of horizontal seismic action can reduce 1.0 degree to upper structure； and the parameters such as surface pressure and horizontal displacement of the isolation bearing under the rare earthquake can satisfy requirements of the codes. The performance-based analysis results show that the seismic behavior of structure is improved by isolation and can meet requirements of seismic performance objectives C. The design of the isolation ditch retaining soil wall was strengthened, so that the cantilever retaining soil wall with a height of 11.7 meters can meet the elasticity requirements of rare earthquake.
Keywords:base isolation； fluid viscous damper； near fault； performance-based design； cantilever retaining soil wall
作者簡介：吳小賓，碩士，教授級高級工程師，一級注冊結(jié)構(gòu)工程師，Email:wumat@vip.sina.com。
