混凝土厚壁结构管冷技术及其效应研究

Numerical Simulation Analysis of Hydration Heat Effect in Bridge Pile Caps

大跨径预应力混凝土连续梁桥中的单箱双室墩顶块,因其庞大的体积和复杂的边界条件,在浇筑初期易因混凝土水化热导致温度急剧上升,进而可能诱发温度裂缝。为有效应对这一挑战,本研究构建了考虑预应力管道影响的综合流固耦合传热及热-力耦合模型,并利用ANSYS软件的自定义功能,成功建立了相应的有限元热力学模型。通过严格的模型验证,证实了所选建模方法、单元类型及材料特性设置的合理性和有效性,为桥梁工程中的温度裂缝防控提供了新的解决思路和有力支持。

Due to the large size and complex boundary conditions of the single-box double-cell pier top block in long-span prestressed concrete continuous beam bridges,the hydration heat of concrete during the initial casting stage can easily lead to a sharp temperature rise,which may subsequently induce temperature cracks.To effectively address this challenge,this study has developed a comprehensive fluid-solid coupling heat transfer and thermo-mechanical coupling model that takes into account the influence of prestressed pipelines.Utilizing the customization capabilities of ANSYS software,we have successfully established the corresponding finite element thermodynamic model.Through rigorous model validation,we have confirmed the rationality and effectiveness of the selected modeling method,element type,and material property settings,providing new solutions and strong support for the prevention and control of temperature cracks in bridge engineering.