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大体积混凝土结构裂缝的产生主要是由水泥水化热引起的温度应力和温度变形引起的。分层浇筑施工具有较好的降温效果,而在分层浇筑之前预埋呈一定形状布置的垂直钢管则具有更好的降温效果。采用ANSYS有限元软件分别模拟某大体积混凝土底板在施工期预埋垂直钢管与不预埋垂直钢管的分层浇筑过程,并将这两种工况下的温度场和温度应力场进行比较,得出了预埋呈梅花形布置垂直钢管的具体降温效果,为相关大体积混凝土施工温度裂缝控制提供参考。
Cracks in mass concrete structures are mainly caused by temperature stress and temperature deformation caused by cement hydration. Layered pouring construction has a good cooling effect, while in the stratified pouring before the vertical arrangement of a certain shape of the vertical pipe has a better cooling effect. ANSYS finite element software was used to simulate the layered pouring process of a large volume concrete slab in the construction period of embedded vertical pipe and non-embedded vertical pipe respectively. The temperature field and temperature stress field under these two conditions were compared The results show that the plumbago-shaped vertical steel pipe is pre-buried, which can provide a reference for the control of temperature cracks in the construction of mass concrete.