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（天津市建筑設計院， 天津 300074）
[摘要]某紀念館工程為雙環(huán)形布置的2層鋼框架結構，柱網呈環(huán)狀布置，局部抽掉較多柱子形成大跨度弧形桁架結構，其受力較為復雜，計算發(fā)現不同的樓板施工方案對弧形桁架受力影響較大。通過采用ETABS軟件對不同樓板剛度下的大跨度弧形桁架進行分析，結果表明樓板形成剛度后對大跨度弧形桁架的受力有較大的改善，因此確定樓板施工方案為先澆筑樓板混凝土并達到強度后再拆除桁架下的臨時支撐。采用ABAQUS軟件對應力較大處樓板進行有限元分析，結果表明樓板鋼筋應力滿足要求，樓板能夠滿足正常使用要求。
[關鍵詞]大跨度弧形桁架； 樓板剛度； 樓板施工順序； 樓板應力
中圖分類號： TU391 文獻標識碼： A文章編號： 1002-848X(2016)S2-0581-03
Influence of floor slab construction scheme on large span arc truss of a project
Dong Jijun， Liu Zhenwen， Huang Xin， Zhu Xudong
（Tianjin Architecture Design Institute， Tianjin 300074， China）
Abstract: A memorial project is a two story steel frame structure with the double ring layout, the column is arranged in rings, the column in some area was removed to form larger span arc truss structure, the force was relatively complex. The calculation results show that the construction scheme of floor has great influence on the force of the arch truss. The large span arc truss under different floor stiffness was analyzed by using ETABS, the results show that the stress of large span arc truss is greatly improved after the floor stiffness is formed, therefore, the construction scheme of the floor slab was determined as concrete to meet the strength requirement before remove the temporary support of the large span arc truss. Finite element analysis of the floor which stress is relatively large was carried out by ABAQUS, results show that the floor reinforcement stress meet the requirements, the floor can meet the requirements of normal use.
Keywords: large span arc truss； floor stiffness； floor construction scheme； floor stress
作者簡介： 董繼軍，碩士，高級工程師，Email：1336969391@qq.com。
