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中文摘要：
通过对我国有关高温下普通混凝土抗压强度、热轧钢筋屈服强度和预应力钢筋极限强度的大量试验数据进行统计分析，发现在绝大多数情况下他们与各自常温强度之比（相对高温强度）均符合正态分布。给出了不同温度作用下上述3类建筑材料相对高温强度的均值和均方差，分别建立了高温下3类建材的相对高温强度均值和具有95％保证率的分位值随温度的定量变化关系。作为基于可靠度的结构抗火设计基础，积极开展高温下各类建筑材料的力学性能统计分析是十分必要的。
英文摘要：
Based on the statistical analysis of a lot of test data on compressive strength of normal-strength concrete, yield strength of mild steel bar, and ultimate strength of prestressed reinforcement at elevated temperature, it is found that the ratio of the strength at elevated temperature to that at room temperature （ i. e. , relative strength in this paper） is consistent with the normal distribution. The mean values and variances of the relative strengths of the above materials at different elevated temperatures are given, and the relationships between the mean value/the value with 95% excess probability and the temperature are proposed, respectively. As a basis of the reliability-based fire resistance design of reinforced concrete structures, it is important to study the statistical mechanical properties of the above materials at elevated temperature.
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