非线性温差作用下混凝土结构的温度应力

Thermal Stress of Concrete Structure Subjected to Non-linear Temperature Variation

为探讨非线性温度梯度作用下混凝土结构温度应力问题,基于松弛法并结合杆件截面分析的网格法,借助Ansys软件二次开发的特性,综合考虑截面配筋及开裂的影响,介绍了空间结构的分析方法.针对上海铁路南站的温度应力,现场量测了环形框架梁中的温度场分布,根据实测结果,提出温度梯度计算的简化公式,并运用前述方法分析主站房的温度应力.分析表明,日照辐射温度对混凝土结构有显著影响.

For investigating the thermal stresses in reinforced concrete structures under the non-linear temperature gradient,an analytical procedure of space structures was presented with the aid of the user-programmable features of ANSYS based on the relaxation-method and the gird-method in sectional analysis.Reinforcing and cracking were also taken into account.In order to study the thermal stresses of the Shanghai south railway station,the temperature variations in the annular girders were measured on site.A simplified formula was proposed to calculate the temperature gradient based on the surveyed data.The forementioned procedure was used to analyze the thermal effect of the main structure.The analytical results show that the temperature load due to solar radiation has a remarkable effect on the concrete structures.