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（成都基準(zhǔn)方中建筑設(shè)計(jì)有限公司， 成都 610000)

［摘要］對(duì)某長(zhǎng)寬為22m×21m的電影院鋼屋蓋進(jìn)行結(jié)構(gòu)方案選型和經(jīng)濟(jì)性比較。采用3D3S，MIDAS Gen，SAP2000及YJK軟件對(duì)正交正放四角錐螺栓球網(wǎng)架、正交正放四角錐焊接球網(wǎng)架、平面管桁架、雙角鋼+槽鋼平面桁架、倒三角管桁架、單向張弦梁、型鋼組合梁7種常用屋蓋結(jié)構(gòu)形式進(jìn)行計(jì)算分析，得到用鋼量、撓度、應(yīng)力比等結(jié)果。并分析了7種屋蓋形式的外觀、施工速度和難易程度等。通過(guò)綜合分析各方面因素，最終選擇了空間效果較好、造價(jià)較優(yōu)與高度較小的倒三角管桁架方案。

［關(guān)鍵詞］鋼結(jié)構(gòu)屋蓋； 經(jīng)濟(jì)性比較； 方案選型； 張弦梁

中圖分類(lèi)號(hào)：TU318文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)14-0008-05

Structural scheme selection and economical comparison of a cinema steel roof

Chen Ke, Jia Jianlei, Wu Bing, Zhang Chi

（Chengdu Benchmark Construction Design Co., Ltd., Chengdu 610000, China）

Abstract:The structural scheme selection and economic comparison of a cinema steel roof with a length and width of 22m×21m were carried out. Seven kinds of common roof structure types, such as orthogonal quadrangular pyramid bolted ball grid, orthogonal quadrangular pyramid welded ball grid, flat tube truss, double angle steel＋channel steel truss, inverted triangular tube truss, unidirectional beam string and steel composite beam were calculated and analyzed by 3D3S, MIDAS Gen, SAP2000 and YJK softwares. And the results of steel quantity, deflection and stress ratio were obtained. The appearance, construction speed and difficulty of these seven roof types were analyzed. Through the comprehensive analysis of various factors, the inverted triangular tube truss scheme with good space effect, better cost and smaller height was finally selected.

Keywords:steel roof; economic comparison; scheme selection; beam string