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火力发电厂中汽轮发电机基座的底板为大体积混凝土结构,施工期的温度应力是防渗和抗裂设计的一个重要指标.本文基于非稳态温度场理论,考虑施工期混凝土强度和弹性模量的逐渐发展,建立了大体积混凝土结构的计算模型,进行了温度应力分析.结果表明,水化热产生的温度应力使得底板大体积混凝土的拉应力具有先出现在表面后出现在中心的特点,所得结果对类似结构的抗裂设计具有一定的参考意义.
The base of steam turbine generator base in thermal power plant is a large-volume concrete structure, and the thermal stress during construction is an important indicator of seepage prevention and crack-resistant design.Based on the theory of unsteady temperature field, considering the strength of concrete during construction and Elastic modulus, the calculation model of mass concrete structure is established and the temperature stress analysis is carried out.The results show that the thermal stress caused by hydration heat makes the tensile stress of bulk concrete in the bottom plate appear first in the center The results obtained have certain reference meaning to crack-resistant design of similar structure.