A critical consideration for the serviceability of composite sandwich panels is their thermal behaviour during fire incidents. This research aims to observe the thermal performance and investigate the insulation failure of the lightweight concrete sandwich panels (LCSPs) in non‐load bearing wall systems. Six standard one‐sided coupling fire tests on LCSPs in accordance with Australian standard AS 1530.4 were conducted via an electrical furnace; measured by thermocouples and a thermal camera, to assess the insulation capacity and their behaviour during fire events. The results indicated that the sandwich panels have insulation capacity for 75 to 110 minutes depending on the thickness and density. The bowing of the panels due to the expansion of the exposed steel shield and the consequent de‐bonding and cracking of concrete was one of the primary reasons of insulation failure. Additionally, this bowing led to the opening of the joints between the panels, which could allow the heat flows towards the unexposed surface. Moreover, the propagation of accelerated drying shrinkage cracks in the restrained concrete core was another reason for the failure. Lastly, the results suggested the benefits of increasing the thickness and density on thermal performance and insulation failure of the composite sandwich panels.

中文翻译：

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轻质复合夹芯板暴露于火焰的绝缘失效

复合材料夹芯板使用寿命的关键考虑因素是其在火灾中的热行为。这项研究旨在观察热性能，并研究非承重墙系统中轻质混凝土夹芯板（LCSP）的绝缘故障。通过电炉对符合澳大利亚标准AS 1530.4的LCSP进行了六次标准的单侧耦合耐火测试；通过热电偶和热像仪进行测量，以评估火灾时的绝缘能力及其行为。结果表明，根据厚度和密度，夹心板具有75至110分钟的隔热能力。由于外露的钢屏蔽层的膨胀而导致的面板弯曲以及随之而来的混凝土的脱粘和开裂是绝缘失效的主要原因之一。另外，这种弯曲导致面板之间的接合处打开，这可能使热量流向未暴露的表面。而且，加速干燥收缩裂纹在约束混凝土芯中的传播是失效的另一个原因。最后，结果表明增加厚度和密度对复合夹芯板的热性能和绝缘破坏的好处。加速干燥收缩裂纹在受约束的混凝土芯中的蔓延是破坏的另一个原因。最后，结果表明增加厚度和密度对复合夹芯板的热性能和绝缘破坏的好处。加速干燥收缩裂纹在受约束的混凝土芯中的传播是导致失效的另一个原因。最后，结果表明增加厚度和密度对复合夹芯板的热性能和绝缘破坏的好处。