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（上海中船九院工程咨詢有限公司， 上海 200063）
［摘要］某室內(nèi)主題樂園采用雙向平面鋼桁架與鋼筋混凝土框架的混合結(jié)構(gòu)形式，其中主桁架跨度103.4m×75.4m，桁架高度為8m，采用Q390高強(qiáng)鋼材；屋面采用鋼筋混凝土屋面，其上有4個(gè)用于支撐外部裝飾構(gòu)件的鋼塔。采用MIDAS/Gen軟件對整體結(jié)構(gòu)進(jìn)行了計(jì)算分析，計(jì)算結(jié)果顯示各項(xiàng)設(shè)計(jì)指標(biāo)均滿足規(guī)范要求，選用的結(jié)構(gòu)體系做法簡潔、便于現(xiàn)場施工。重點(diǎn)針對混合結(jié)構(gòu)協(xié)同分析時(shí)阻尼比的取值以及屋面桁架支座選用方面進(jìn)行分析，得出統(tǒng)一阻尼比法與振型阻尼比法的計(jì)算結(jié)果較為接近，且前者設(shè)計(jì)內(nèi)力偏于安全；一半固定鉸+一半彈性支座的支座類型基底內(nèi)力最小，且其動(dòng)力特性最為合理。
［關(guān)鍵詞］平面鋼桁架；大跨屋蓋結(jié)構(gòu)；阻尼比；彈性支座
中圖分類號：TU393-3文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2021)03-0032-08
Structural design of heavy load and large-span roof of an indoor theme park
SHI Danwei
(Shanghai CSSC NDRI Engineering Consulting Co., Ltd., Shanghai 200063, China)
Abstract:An indoor theme park adopts mixed structural form of two-way plane steel truss and reinforced concrete frame. The span of main truss is 103.4m×75.4m, and the height of the truss is 8m, and high strength steel Q390 is used in main trusses. The roof is reinforced concrete roof, on which there are four steel towers used to support exterior decoration members. The software MIDAS/Gen was used to calculate and analyze the overall structure, the calculation results show that all design indexes meet the codes requirements, and the selected system is simple and convenient for on-site construction. Focusing on the analysis of the value of damping ratios used to cooperative analysis of mixed structures, and the selection of roof truss supports, it is concluded that the calculation results of the unified damping ratio method and the mode shape damping ratio method are relatively close, and the design internal force of the former is safer; the support type of "half fixed hinge support + half elastic support" has the smallest base internal force and the most reasonable dynamic characteristics.
Keywords:plane steel truss;large-span roof structure;damping ratio;elastic support
作者簡介：施丹煒，學(xué)士，高級工程師，Email:taoshimei2009@163.com。
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