基于试验的混凝土高温短期徐变计算模型

SHORT-TERM THERMAL CREEP MODEL OF CONCRETE BASED ON EXPERIMENTS

通过试验考察了应力水平、持荷时间、作用温度和混凝土强度等级等因素对混凝土高温短期徐变的影响。结果表明,混凝土高温短期徐变与应力水平和持荷时间分别呈正比和幂函数关系,而随作用温度增加抛物线状地增大。但混凝土强度等级不同时这些因素的影响程度也有所不同,并且混凝土强度等级和作用温度具有明显的耦合影响特性。基于这些试验结果分析,该文给出了有助于更好地进行混凝土结构高温受力性能计算分析的混凝土高温短期徐变计算模型。

The influences of stress level,load-lasting time,temperature and concrete strength on the short-term thermal creep of concrete are investigated based on experiments.It is shown that the short-term thermal creep of concrete is a linear function of the stress level,a power function of the load-lasting time,a parabolic function of the temperature and affected by the concrete strength.The influences of the concrete strength and the temperature are obviously coupled.A calculation model for the short-term thermal creep of concrete is proposed based on the experimental results.It can be used to analyze the mechanical performance of concrete structures subjected to high temperature.