缩尺结构模型火灾试验方案是近年问世的，该方案考虑了所有重要结构的热响应。调查构件内部的热分布可以建立火灾曲线、热输入和结构位移输出之间的因果关系。进行量纲分析可以确定原型与模型之间动态相似的必要条件。本文论述了等效模型火灾曲线的导出过程，该曲线可通过简单的时间比例系数变换到标准火灾曲线上，不过，由于薄膜效应的存在，曲线会有些变形。由于模型与原型温度分布的性质不同，因此由材料特性对温度的依赖性所导致的误差是可以消除的。这些原理已为不同比例的有机玻璃模型中的低温实验所精确证实。最后，应该注意，与参数调查相比，模型试验法有助于提供足够数量的指示性试验数据。然而，应该认识到，要想获得耐火能力的最佳、最后的评估，则必须进行一次性足尺寸试验。 Scale structure model The fire test program was introduced in recent years, which takes into account the thermal response of all important structures. Investigating the internal heat distribution within a component can establish a causal relationship between the fire profile, heat input, and structural displacement output. Dimensional analysis can determine the necessary conditions for the dynamic similarity between the prototype and the model. This article discusses the derivation of the equivalent model fire curve that can be transformed to a standard fire curve with a simple time scale factor, however, the curve will be somewhat distorted due to the film effect. Due to the different nature of the temperature distribution of the model and prototype, the error caused by the dependence of material properties on temperature can be eliminated. These principles have been accurately demonstrated for cryogenic experiments in different proportions of plexiglass models. Finally, it should be noted that model testing helps to provide a sufficient number of indicative test data as compared to parametric surveys. However, it should be recognized that in order to obtain the best, final assessment of fire resistance, a one-time full-size test is required.