考虑施工过程收缩徐变对高层建筑结构影响理论分析

混凝土收缩徐变对高层建筑结构有重要影响，目前还没有一种比较符合实际受力模型的计算方法，将施工过程引入收缩徐变对高层建筑结构影响分析，考虑竖向构件轴力变化，混凝土弹性模量变化及收缩徐变使钢筋混凝土截面应力重分布引起混凝土截面应力的变化。利用混凝土徐变中值系数和混凝土弹性模量中值系数，推导出高层建筑竖向承重构件的应变计算公式，通过分析施工过程收缩徐变的变形特点及其对水平构件的影响，建立了高层建筑结构收缩徐变竖向变形计算公式并进行了算例分析。结果表明收缩徐变对高层建筑结构有重要影响，计算公式符合实际受力模型，可供工程设计参考。

Influence of shrinkage and creep on high-rise building in construction process

By considering the variation of axial force in vertical members through the construction process of high-rise building,of concrete elastic modulus and cross section stress caused by stress redistribution due to shrinkage and creep,calculation formulas for are established calculating strain in vertical bearing members of high-rise building,using concrete creep median coefficient and concrete elastic modulus median coefficient.Through analyz-ing the deformation features of shrinkage and creep in construction process and its influence on horizontal mem-bers,calculation formulas for are established calculating the vertical deformation of high-rise building caused by shrinkage and creep.A calculating example was analyzed by using formulas in this paper.The analysis result indi-cates that shrinkage and creep's influence on high-rise building is important and should be considered.Calculating formulas in this paper accord with practicalcarrying model,and can be a useful reference for engineering design.