施工过程中混凝土徐变对结构竖向变形影响的有限元模拟

The Simulation of the Influence of the Concrete Creep on Structure Vertical Displacement by Finite Element Method

通过有限元模拟及算例验证,分析了高层建筑考虑施工过程中混凝土材料徐变对结构竖向变形的影响。分析表明,混凝土的徐变变形作用对柱的轴力影响不大,但对柱端弯矩影响较大;考虑徐变变形的柱端弯矩计算结果较没有考虑徐变变形的情况有显著减小。在考虑徐变影响的情况下,各层位移均有所增加,且两者的最大差值相差较大,很可能会影响结构的正常使用,在设计过程中不应忽视。该研究结果可为考虑高层建筑结构在施工过程中材料的徐变性能对结构内力的影响提供理论依据及分析方法。

This paper studies the influence of creep deformation on the structure＇s vertical displacements during the construction by the numerical example. Analysis shows that the creep deformation has little effect on the force of the column but it has a great impact on the moment of the column. If the creep deformation is not considered, the moment of the column is bigger than the actual statue. If creep deformation is taken into consideration, the displacement in each floors is greater, thus the maximum difference of them will have a big effect on the structure＇s safety. We should not neglect the concrete creep deformation in our designing. The research results provide a theoretical basis and analysis methods for the influence that the creep deformation of materials may have on high-rise buildings.