高温后砖砌体抗压性能试验研究

Experimental study on compression behaviors of brick masonry after high temperature

为了研究火灾后砖砌体的抗压性能,对不同温度(室温、200℃、400℃、600℃和800℃)后自然冷却的砖砌体试件进行了抗压试验,得到了砖砌体的破坏特征及抗压强度、弹性模量和泊松比等随温度的变化规律,以及高温后砖砌体的应力-应变关系,分析了温度对砖砌体抗压强度的影响机理。研究表明,随着温度的升高,砖砌体的抗压强度、弹性模量逐渐降低,泊松比逐渐增大。试验结果可为砖砌体结构抗火设计提供参考。

In order to study the compression behaviors of brick masonry after fire, the compression tests of brick masonry suffered different high temperatures （ room temperature, 200 , 400 , 600 and 800 ） and cooled by air were carried out. The failurecharacteristics of brick masonry and the change rules of brick masonry compression strength, elastic modulus and poisson ratio were gained. The curves of stress-strain about brick masonry after high temperature were also gained. The influencing mechanism of temperature on the compression strength of brick masonry was analyzed. The study indicated that the brick masonry strength and elastic modulus reduced with the increasing temperature, but the poisson ratio increased. The results of study can offer a support to the fire design of brick masonry.