徐变对砌体墙温度应力的影响

Effect of Creep on Temperature Stress of Masonry wall

为了研究徐变对砌体温度应力的影响,参照再生混凝土砖砌体徐变模型,采用老化理论和指数函数砌体徐变模型,推导两端固定的砌体杆件在温度变形作用下构件砌体应力变化规律,并将周期性季节温度简化为线性函数,根据季节温度变化,分别推导出考虑徐变时与不考虑徐变时的砌体温度应力的计算公式,通过两个不同条件的计算公式对比,提出了温度应力的松弛系数。研究提出了考虑徐变效应时,两端受约束砌体构件的温度应力计算公式;同时,提出了在季节温度作用下,砌体温度应力的松弛系数计算公式,并建议在分析季节温度作用时,考虑应力松弛系数0.8。

In order to study the effect of creep on the temperature stress of masonry,this paper,based on the creep model of recycled concrete brick masonry,us-ing the aging theory and the creep model of exponential function for masonry to deduce the stress change rule of the component masonry under the action of tem-perature deformation of the masonry member with two ends fixed,and simplified the periodic seasonal temperature into a linear function.According to the season-al temperature change,this paper derived the calculation formulas for the temperature stress of the masonry when creep is considered and not considered,re-spectively.Based on the comparison between the two calculation formulas,the relaxation coefficient of temperature stress is put forward.The study presented the calculation formula for the temperature stress of the masonry members with two ends restrained when considering the creep effect;Meanwhile,a calculation for-mula for the relaxation coefficient of the temperature stress of the masonry under the action of seasonal temperature was proposed,and it is suggested that the stress relaxation coefficient should be considered to be 0.8 when analyzing the effect of the seasonal temperature.