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五、特殊情况下的砼本构关系模式规范中给出的上述砼强度和变形性能指标,一般是根据砼试件在龄期28天、常温条件(平均为20℃)下,以标准速度(表1)进行一次单调加载试验所得的数据进行统计和理论分析的结果.实际工程中,结构砼受力时的龄期长,环境温度可能偏高、且有变化,作用的荷载可能是高速冲击、长期持续或多次重复加卸.此外,砼还与周围环境的液体或气体介质发生物理和化学作用,因而影响其耐久性.所有这些因素都对砼的强度和变形性能产生程度不等的影响.为了进行相应的结构性能分析,模式规范中给出了必要的本构关系.下面分别作简单介绍.
5. The above-mentioned strength and deformation performance indicators given in the model specification under the special circumstances are generally based on the standard speed of the concrete specimens at age 28 days and normal temperature conditions (average at 20°C). Table 1) Results of statistical and theoretical analysis of data obtained from a monotonic loading test. In actual projects, the structural age of the structure is long, the ambient temperature may be high, and changes may occur. The effect of the load may be high-speed impact. , long-lasting or repeated repeated loading and unloading. In addition, helium also has physical and chemical interactions with the surrounding liquid or gaseous medium, thus affecting its durability. All of these factors have varying degrees of strength and deformation properties of helium. Impact. In order to perform the corresponding structural performance analysis, the necessary constitutive relations are given in the model specification. The following is a brief introduction.