现浇混凝土聚苯板外墙外保温体系热结构耦合分析

THERMAL-STRUCTURE COUPLING ANALYSIS ON CAST-IN-SITU CONCRETE POLYSTYRENE BOARD EXTERNAL WALL INSULATION SYSTEM

以某高层剪力墙住宅工程中现浇混凝土聚苯板外墙外保温体系为研究对象,建立APDL参数化模型,采用数值计算方法,针对3种不同厚度聚苯板复合墙体,分析了现浇混凝土聚苯板外墙外保温体系在极端高温和骤降暴雨环境下的热结构耦合反应。结果表明:聚苯板具有良好的隔热效果,聚苯板两侧温差大,但随着聚苯板厚度的增加增幅变小;温度改变导致聚苯板层发生显著变形,由于材料性能的差异,致使聚苯板两侧界面处易开裂;变形最大的区域位于窗洞四周,是易开裂处之一,应予以加强。

External wall insulation system, namely cast- in -situ concrete polystyrene board in high -rise shear wall residential projects, was taken as the research subject. In consideration of polystyrene board with three different thicknesses, thermal - structure coupling effect of extreme high temperature and rainstorm on cast - in - situ concrete polystyrene board was analyzed via the APDL parametric model and the numerical methods. The result shows that polystyrene board has great insulation performance, which means that both sides of polystyrene board have large temperature difference. However, with the increment of the thickness of polystyrene board, the large temperature difference would continuously increase with lower amplitude. The polystyrene board exhibits significant deformation under large temperature change, therefore both sides of the polystyrene board interface is liable to crack. One of the most vulnerable areas, namely around opening in a wall, gives us concerns and should be strengthened.