摘要
根据瞬态热传导方程,用有限元分析软件对拱形结构混凝土动态浇筑过程进行模拟和对温度场进行仿真分析。结果表明,采用有限元仿真分析混凝土浇筑温度场是可行的;混凝土内部最大温升在浇筑30.84h时达到峰值,约为62℃;混凝土内部最大温度梯度发生在浇筑22.42h时,为46.4℃/m;混凝土内部最大温度应力发生在浇筑35.84h时,最大温度第一主应力为0.070MPa。根据温度梯度随时间的变化规律,对现场混凝土适时采取保温隔热措施,防止了拱形结构混凝土温度裂缝的产生。
The concrete pouring of an arched structure was simulated by finite element model and the temperature field of mass concrete was calculated based on transient conduction of heat equation and boundary condition.The results indicate that the finite element model is feasible to simulate the temperature field during concrete pouring in practice.The maximum temperature rise inside the concrete is about 62℃,which is achieved at 30.84h.The maximum temperature gradient is 46.4℃ / m at 22.42h.The maximum first temperature stress is 0.070MPa at 35.84h.According to the law of change about temperature gradient,the updating thermal retardation and insulation measures were adopted,which prevented temperature cracks inside concrete of the arched structure.
出处
《建筑结构》
CSCD
北大核心
2011年第3期78-80,共3页
Building Structure
关键词
大体积混凝土
拱形结构
温度场
仿真
有限元分析
mass concrete
arched structure
temperature field
simulation
finite element analysis
