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利用换算时间的概念,来考虑干燥了的老混凝土在高温下(达200℃)徐变变形发展特性和混凝土的温度时效,是十分有效的方法。这时,并非采用普通的时间概念来计算时间,而是采用换算时间来计时,换算时间是与徐变变形发展特性有关的温度函数。函数F(t)表示时间尺度随温度的变化,建议按下式计算: F(t)=0.7+0.015t+t~2×10~(-5) (2) 求算F(t)的基本要求是,按换算时间绘制的单位徐变变形曲线和温度时效曲线,应是形状相似的。
Using the concept of conversion time, it is a very effective method to consider the creep deformation properties of the dried concrete under high temperature (up to 200°C) and the temperature aging of the concrete. In this case, instead of calculating the time using the ordinary concept of time, the conversion time is used to time the conversion time, which is a temperature function related to the development characteristics of creep deformation. The function F(t) represents the change of the time scale with temperature. It is suggested that the following formula is used: F(t)=0.7+0.015t+t~2×10~(-5) (2) Find the basic of F(t) The requirement is that the unit’s creep deformation curve and temperature aging curve plotted according to the conversion time should be similar in shape.