摘要
针对火灾发生时混凝土内部的温度场,通过理论分析,研究了温度场的计算方法。结果表明:升温曲线为对数函数,初期速率高,后期趋于平缓;杆系结构可简化为二维温度场,平面结构可简化为一维温度场;通过软件拟合,得到了综合换热系数和火焰温度的关系曲线;对比三种求解方法,解析法仅适用于简单工况,差分法精度较高但不适用于复杂构件,发现有限元-差分法适用各种复杂工况条件,可用于高温状态下混凝土内部温度场的计算。
Aiming at the temperature field in concrete during fire,the calculation method of temperature field was studied through theoretical analysis.The results show that:The temperature rise curve is a logarithmic function,the rate is high in the initial stage and tends to be flat in the later stage;The bar structure can be simplified into two-dimensional temperature field,and the plane structure can be simplified into one-dimensional temperature field;Through software fitting,the relationship curve between comprehensive heat transfer coefficient and flame temperature is obtained;Comparing the three methods,the analytical method is only suitable for simple working conditions,and the difference method has high accuracy,but it is not suitable for complex components.It is found that the finite element difference method is suitable for various complex working conditions and can be used to calculate the internal temperature field of concrete under high temperature.
作者
杨海林
YANG Hailin(Tangshan Polytechnic College,Tangshan 063299,China)
出处
《工业技术与职业教育》
2022年第3期38-42,共5页
Industrial Technology and Vocational Education
基金
2021-2022年度唐山工业职业技术学院院级课题“冲击回波法检测火灾后混凝土内部损伤的应用研究”(课题编号:YJKT202110),主持人杨海林。
关键词
高温混凝土
热传导微分方程
换热系数
有限元-差分法
温度场
high temperature concrete
differential equation of heat conduction
heat transfer coefficient
finite element difference method
temperature field
