南宁某超限项目收缩和徐变分析

Analysis on shrinkage and creep of an over-limited project in Nanning

本工程为钢筋混凝土核心筒+钢管混凝土框架混合结构,采用欧洲规范CEB-FIP模式计算混凝土收缩徐变影响,具体分析了竖向构件累积变形以及收缩徐变对框架柱的影响。分析结果表明,施工完成5年后最大柱轴力(与伸臂桁架连接处柱)约增加10%,在施工图设计阶段应考虑收缩徐变的不利影响,并采用调平设计。收缩徐变对伸臂桁架内力和变形产生影响,计算中应考虑此部分荷载叠加,使伸臂桁架满足规范要求。重力荷载引起的楼层水平位移会影响设备的安装,设计中也应考虑。同时施工阶段和使用阶段必须对收缩徐变进行监控。

The project is a reinforced concrete core tube + concrete-filled steel tube frame hybrid structure.The European standard CEB-FIP mode was used to calculate the shrinkage and creep of concrete.The cumulative deformation and shrinkage and creep of the vertical members were analyzed.The analysis results show that the maximum column axial force( with the column of the truss joint) increases by about 10% after 5 years of construction,and the adverse effects of the deformation should be considered in the design stage of the construction drawing,and the leveling design is adopted.Shrinkage and creep have an effect on the internal force and deformation of the outrigger truss.This part of superimposed load should be considered in the calculation,so that the outrigger truss meets the requirements of the specification.The horizontal displacement of the floor caused by gravity loads will affect the installation of the equipment and should also be considered in the design.The deformation must be monitored during both the construction phase and the use phase.