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    朱彥鵬，  王永勝，  周  勇，  高  超
    （蘭州理工大學(xué)土木工程學(xué)院，蘭州730050）

[摘要] 高煙囪支承施工平臺(tái)輻射梁的支承點(diǎn)隨煙囪高度增長不斷往中心移動(dòng)，滑模和施工平臺(tái)在工作過程中處于運(yùn)動(dòng)狀態(tài)，特別是當(dāng)平臺(tái)受力不均時(shí)會(huì)產(chǎn)生不均勻的變形和位移。因此，運(yùn)動(dòng)中的施工平臺(tái)空間力學(xué)模型的建立和計(jì)算較為繁瑣，大多數(shù)施工平臺(tái)結(jié)構(gòu)的設(shè)計(jì)計(jì)算常簡化為平面結(jié)構(gòu)進(jìn)行分析，其結(jié)果難以反映施工平臺(tái)的真實(shí)受力狀況。以某電廠高煙囪液壓同步提升施工平臺(tái)為背景，考慮最不利工況，建立該施工平臺(tái)的三維有限元模型，利用ANSYS有限元分析軟件，對(duì)施工平臺(tái)結(jié)構(gòu)的受力及位移進(jìn)行計(jì)算。結(jié)果表明，施工平臺(tái)的位移以筒壁為支點(diǎn)呈現(xiàn)內(nèi)沉外翹的趨勢(shì)；內(nèi)力除去掉支座位置有突變外，其余桿件受力均勻，呈現(xiàn)對(duì)稱受力的特點(diǎn)，平臺(tái)的結(jié)構(gòu)形式對(duì)受力的影響較大。
[關(guān)鍵詞] 高煙囪；滑模施工平臺(tái)；結(jié)構(gòu)形式；三維有限元分析
中圖分類號(hào)：TU357    文獻(xiàn)標(biāo)識(shí)碼：A  文章編號(hào)：1002-848X(2011) S2-0491-05

    3D finite element analysis of spatial structure of construction platform of high chimneys
    Zhu Yanpeng, Wang Yongsheng, Zhou Yong, Gao Chao
    ( College of Civil Engineering,  Lanzhou University of Technology,  Lanzhou 730050,  China)

Abstract: The radiation beam support points of tall chimney construction platform move to center bit by bit with chimney height growth, sliding mould construction platform in working process is in motion state, especially when the force state of platform in uniform, it can produce uneven deformation and displacement. Therefore, the establishment and calculation of the space mechanical model of the construction platform in movement is complicated. Design and calculation of most platform structures are often simplified as plane structure. The result cannot reflect the real stress condition of construction platform. Based on a power plant high chimney hydraulic synchronizing lifting construction platform, most unfavorable conditions were considered, ANSYS is used to set up the 3D finite element mode and calculate the stress and displacement of the structure. The results show that the displacements of construcUon platform take the cylinder wall as a fulcrum, and have the trend of the inner sink outside warp. The intemal force of structure member is even and present symmetrical stress characteristics except the bearing position have mutated, and the influence of platform structure form on the stress is strong.
Keywords: high clumney; sliding mould construction platform; structure form; 3D fuute element analysis