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考慮材料非線性的RC冷卻塔風致動力破壞研究

張軍鋒 徐世瑤 裴昊 劉慶帥

張軍鋒, 徐世瑤, 裴昊, 劉慶帥. 考慮材料非線性的RC冷卻塔風致動力破壞研究[J]. 工程力學, 2023, 40(10): 81-88, 140. doi: 10.6052/j.issn.1000-4750.2022.01.0060
引用本文: 張軍鋒, 徐世瑤, 裴昊, 劉慶帥. 考慮材料非線性的RC冷卻塔風致動力破壞研究[J]. 工程力學, 2023, 40(10): 81-88, 140. doi: 10.6052/j.issn.1000-4750.2022.01.0060
ZHANG Jun-feng, XU Shi-yao, PEI Hao, LIU Qing-shuai. STUDY ON FAILURE OF RC COOLING TOWER UNDER FLUCTUATING WIND LOADing CONSIDERING THE MATERIAL NONLINEARITY[J]. Engineering Mechanics, 2023, 40(10): 81-88, 140. doi: 10.6052/j.issn.1000-4750.2022.01.0060
Citation: ZHANG Jun-feng, XU Shi-yao, PEI Hao, LIU Qing-shuai. STUDY ON FAILURE OF RC COOLING TOWER UNDER FLUCTUATING WIND LOADing CONSIDERING THE MATERIAL NONLINEARITY[J]. Engineering Mechanics, 2023, 40(10): 81-88, 140. doi: 10.6052/j.issn.1000-4750.2022.01.0060

考慮材料非線性的RC冷卻塔風致動力破壞研究

doi: 10.6052/j.issn.1000-4750.2022.01.0060
基金項目: 國家自然科學基金項目(51508523);橋梁結構抗風技術交通行業重點實驗室開放課題項目(KLWRTBMC21-03)
詳細信息
    作者簡介:

    徐世瑤(1997?),男,河南寶豐人,碩士生,主要從事結構抗風研究(E-mail: 417912592@qq.com)

    裴 昊(1995?),男,河南鄭州人,碩士生,主要從事結構抗風研究(E-mail: 1315491065@qq.com)

    劉慶帥(1996?),男,河南新鄉人,碩士生,主要從事結構抗風研究(E-mail: 727428364@qq.com)

    通訊作者:

    張軍鋒(1983?),男,河南平頂山人,副教授,博士,主要從事結構和橋梁抗風研究(E-mail: brilliantshine@163.com)

  • 中圖分類號: TU33+2;TU375

STUDY ON FAILURE OF RC COOLING TOWER UNDER FLUCTUATING WIND LOADing CONSIDERING THE MATERIAL NONLINEARITY

  • 摘要: 為明確RC冷卻塔的風致動力破壞過程和極限脈動風荷載,采用ABAQUS對一代表性結構進行了計算。以分層殼單元模擬塔筒,分別采用塑性損傷模型和雙折線模型模擬混凝土和鋼筋的非線性本構,在對該塔規范靜風極限承載力計算以及與既有彌散開裂模型結果對比的基礎上,進行了試驗脈動風荷載下的動力增量分析(IDA),結合變形模式、位移IDA曲線、裂縫分布、應力發展、塑性和剛度演化等方面對塔筒的破壞過程進行了系統闡述,并與靜風破壞過程進行了對比。結果表明:靜風荷載下,塑性損傷模型所得結構開裂荷載與彌散開裂模型結果一致,但前者所得結構極限荷載略高,結構延性更好;靜力和動力風荷載作用下的結果差異來自本構模型、荷載模式和動力效應;脈動風荷載作用下RC冷卻塔的結構破壞依然源于迎風子午向受拉導致的塔筒開裂和鋼筋屈服,但應更關注塔筒大范圍開裂導致的結構剛度下降:動力風荷載作用下塔筒破壞(V0=57 m/s)時混凝土受拉開裂單元比例為63.13%,明顯高于靜風作用下的結果。
  • 圖  1  冷卻塔特征尺度示意 /m

    Figure  1.  Characteristic dimension of cooling tower

    圖  2  塔筒結構參數

    Figure  2.  Structural parameters of tower shell

    圖  3  中塑性損傷模型拉(壓)應力-應變曲線

    Figure  3.  Tensile (compressive) stress-strain curve of plastic damage model

    圖  4  兩種本構所得荷載-位移曲線

    Figure  4.  Load-displacement curves of two constitutive models

    圖  5  不同位置位移IDA曲線

    Figure  5.  IDA curves of displacements at different positions

    圖  6  V0=57 m/s時塔筒B點位移時程

    Figure  6.  Displacement history at point B for V0=57 m/s

    圖  7  V0=45 m/s不同時刻外表面裂縫分布

    Figure  7.  Crack distributions on outer surface for V=45 m/s

    圖  8  V0=48 m/s不同時刻外表面裂縫分布

    Figure  8.  Crack distributions on outer surface for V=48 m/s

    圖  9  V0=50 m/s不同時刻外表面裂縫分布

    Figure  9.  Crack distributions on outer surface for V=50 m/s

    圖  10  V0=52 m/s不同時刻外表面裂縫分布

    Figure  10.  Crack distributions on outer surface for V=52 m/s

    圖  11  V0=57 m/s不同時刻外表面裂縫分布

    Figure  11.  Crack distributions on outer surface for V=57 m/s

    圖  12  不同風速下材料應力時程

    Figure  12.  Material stress histories for different velocities

    圖  13  塔筒材料進入塑性單元比例

    Figure  13.  Plastic element ratios of two materials in tower shell

    圖  14  V0=57 m/s時兩種材料屈服單元比例

    Figure  14.  Plastic element ratios of two materials at V0=57 m/s

    圖  15  塔筒相對剩余剛度

    Figure  15.  The relative residual stiffness of the tower shell

    表  1  兩種本構所得靜力計算特征結果

    Table  1.   The results of the two methods in static calculation

    本構模型 計算工況 開裂荷載
    系數λ
    極限荷載
    系數λU
    喉部極限
    位移/m
    彌散開裂模型 G+λW 1.38 2.01 0.84
    G+T+λW 1.00 1.84 0.53
    塑性損傷模型 G+λW 1.38 2.26 2.12
    G+T+λW 1.08 2.26 2.10
    下載: 導出CSV

    表  2  靜力和動力破壞時塑性單元比例匯總

    Table  2.   The results of the two methods in static calculation

    計算工況 混凝土單元
    受拉開裂比例/(%)
    混凝土單元
    進入塑性比例/(%)
    規范風壓靜力計算 G+λW 37.45 7.96
    G+T+λW 40.32 8.47
    試驗風壓動力計算 G+λW 63.13 5.25
    下載: 導出CSV

    黑人大屌丝逼逼
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  • 收稿日期:  2022-01-12
  • 修回日期:  2022-03-31
  • 錄用日期:  2022-04-08
  • 網絡出版日期:  2022-04-08
  • 刊出日期:  2023-10-10

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