温度升高20～50℃对混凝土弹性模量的影响探究

Influence of Temperature Rising by 20 ℃ to 50 ℃ on Concrete Elastic Modulus

弹性模量是混凝土的重要力学指标,是混凝土结构计算分析中的关键参数,不同温度下混凝土弹性模量如何变化一直是人们比较关心的问题。本文采用一种加热保温装置,给混凝土试件施加均匀温度场,在不同温度下给试件施加压力;用压力传感器测量试件承受压力,应变计测量试件变形,根据不同温度下的应力和应变计算了试件的弹性模量,分析了不同温度下混凝土弹性模量的变化规律。试验结果表明,常温下当温度升高为20～50℃时,混凝土弹性模量随温度变化不明显,可以近似按常数处理。

Elastic modulus is an important mechanical index of concrete, is a key parameter on concrete structure calculation and analysis, and the change law at different temperatures has been issues that people are concerning about. In this paper, uniform temperature field was applied on the concrete specimens by electric heating strap, the load was applied on specimens at different temperatures, the specimens strain was got by strain gauge, and stress of the specimen was measured by pressure sensor. Based on the stress and strain at different temperatures, elasticity modulus of the specimen was calculated, and the variation law of the elasticity modulus of concrete at different temperatures was analyzed. The test results showed that, in normal temperature, when the temperature rises 20-50 ℃ change of concrete elastic modulus with temperature is negligible, and its value can be handled constant. , the by a