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熱冷循環下外墻外保溫系統耐候性能數值模擬

Numerical simulation of the weathering performance of an exterior wall external insulation system under heating-cooling cycles

  • 摘要: 為了從墻體溫度穩定性角度探討外墻外保溫系統的耐候性能,利用ABAQUS有限元軟件,對采用膠粉聚苯顆粒保溫漿料涂料飾面的外墻外保溫墻體,建立三維瞬態熱結構耦合模型并進行數值模擬分析,計算其在熱冷循環下不同功能層的實時溫度場、熱應力及位移分布.計算結果表明:在熱冷循環過程中,涂料飾面層溫差最大,墻體內飾面層溫差最小,日變化量在2℃以內;沿墻厚方向保溫漿料層溫度變化率均大于其他材料.涂料飾面層經歷拉壓循環,低溫時受拉,高溫時受壓;在整個循環過程中基層墻體內表面始終受壓,基層墻體內應力變化幅度較小.與保溫漿料層相比,界面砂漿層所受應力較大,保溫漿料層應力幾乎為零.沿墻厚方向最大位移出現在保溫漿料層.

     

    Abstract: In the current construction industry, exterior wall external insulation systems are widely used but suffer some obvious weathering problems such as deformation, drop in thermal insulation, and fracture of the surface layers. To investigate the weathering performance of an exterior wall external insulation system from the perspective of wall temperature stability, ABAQUS finite element software was used to establish a three-dimensional transient thermal-structural coupling model of the effect of paint finishes, with added adhesive powder polystyrene particle insulation slurries, on exterior wall external insulation. Numerical simulation analysis was carried out to calculate the real-time temperature field, thermal stress, and displacement distribution of different functional layers under heating-cooling cycles. Results show that during the heating-cooling cycles, the temperature difference in the coating layer is the greatest, that in the interior layer is the smallest, and the daily change is within 2℃. The rate of temperature change in the insulation slurry layer in the thickness direction is higher than that in the other materials. The coating layer is subjected to tension-compression cycles with tension at low temperatures and compression at high temperatures. The inner surface of the primary wall is always under compression throughout these cycles and the stress variation in the primary wall is small. By comparison, the stress in the interfacial mortar layer is large and that in the insulation slurry layer is almost zero. The maximum displacement in the thickness direction occurs in the insulation slurry layer.

     

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