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    萬達娛雪樂園的大跨度空間結構是怎么設計的?
    RSS 打印 復制鏈接 發布時間:2019-05-31 17:30:15

     前言

    對大型公共建筑由外造型和內功能所決定的平面及豎向上的復雜變化以及特殊空間需求,通過立體管桁架+混凝土框架結構體系實現;對大跨度空間結構及特殊形式柱,簡要探討了結構穩定性及設計控制準則,完成了多管相交節點設計,同時在整體中而非孤立地考察了局部關鍵節點;設計流程中引入了BIM技術,結構設計實現了有效的專業配合、設計優化深化、設計校審及施工配合。

    項目名稱:重慶萬達旅游城萬達茂項目丨娛雪樂園
    項目地點:重慶市沙坪壩區西永
    業主單位:重慶萬達城投資有限公司
    結構設計團隊:重慶市設計院丨第一建筑設計院
    建筑面積:2.9萬平方米
    設計時間:2017~2018年

    項目背景及概況

    重慶萬達茂(Wanda Mall)是超大型文化旅游項目,位于重慶市沙坪壩區西永片區,項目地塊南側緊臨西井大道,為城市主干道;西側文旅西二路為城市次干道。本項目總建筑面積21.4萬㎡,由商業街和大型室內主題樂園(溫泉水樂園、海洋樂園、娛雪樂園)組成。商業街與主題樂園由中間消防通道分開各自獨立,三大樂園間通過結構縫脫開。

    三個樂園中的娛雪樂園是目前全球最先進的第四代室內滑雪場,場內設有多條不同坡度雪道,還有下雪體驗區,給游客帶去北國冰雪風景。娛雪樂園總建筑面積約2.9萬㎡,平面長向189m,短向142m,地上高度28~40m,屋蓋呈北高南低。


    冷區鳥瞰圖


    冷區主滑雪道效果圖

    結構體系

    娛雪樂園下部結構為鋼筋混凝土框架結構,分別在西南側有三層結構(暖區),在東南側和西北側有單層滑雪道結構,在東側有三層滑雪道結構,均為混凝土框架結構與外圍大空間框架相連;西側單層混凝土框架與外圍大空間框架設縫脫開。屋蓋結構為大跨度立體鋼桁架結構,采用倒三角形立體管桁形式,支座位于下部外圍框架柱上。桁架矢高3.9~9.2m,最大跨度80.3m。

     下部結構平面

    776e74ae4fac96366adc44eed68bcb96.png

    屋蓋結構平面(主桁架)


    結構側立面


    滑道結構剖面

    結構設計計算分析采用整體建模,以考慮上下部結構協同。


    下部混凝土結構

    上部鋼結構

    整體建模

    結構的整體穩定性

    整體穩定分析顯示,結構失穩首先體現為屋蓋鋼結構的失穩,各失穩形態為局部性桁架的側向彎曲扭轉,結構穩定性安全系數均≥4.2。下部混凝土結構的穩定性則顯著高于屋蓋鋼結構部分,其穩定安全系數是屋蓋鋼結構穩定安全系數的近2倍,失穩形態呈現一定的整體性結構傾覆。


    屋蓋鋼結構失穩形態


    下部結構失穩形態

    下部結構失穩時最大變位剖面

    外圍混凝土框架柱穩定性

    建筑專業提出在外圍框架柱內檢修通行的功能性需求,因此外圍大柱采用格構柱(帶層間梁的框架)。對懸臂柱分析表明,按桿單元和實體單元建立的格構柱與按桿單元建立的實腹工字形柱三者失穩時形態一致,穩定承載力接近,柱內開洞后對穩定承載力影響不明顯。此外,混凝土結構分肢柱穩定性高于整體格構柱。
     
    結構設計按規范剛性屋蓋單層排架柱取計算長度控制整體格構柱二階效應基準,同時偏安全按分肢與整體格構柱等穩定性原則控制分肢穩定性,進行承載力設計。

    格構柱與實腹柱、桿單元與實體單元模型對比 

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