兰州红楼时代广场施工模拟与混凝土收缩和徐变效应分析  

Simulation of construction and concrete shrinkage and creep effects for Lanzhou Honglou Times Square

作　　者：占毅[1] 杨学林[1] 李晓良[1] 周平槐[1] 

机构地区：[1]浙江省建筑设计研究院,杭州310006

出　　处：《建筑结构》2012年第8期56-61,共6页Building Structure

摘　　要：在兰州红楼时代广场施工过程模拟的基础上,对主楼高层框架柱与钢筋混凝土筒体的竖向变形及竖向变形差异随时间和空间的变化规律进行分析。在分析中采用时间依存累加模型,在混凝土特性中考虑徐变、收缩和强度增长,并计入部分构件(如加强层伸臂桁架)延时安装对整体模型的影响。并比较不同加载模式、框架梁梁端与核心筒不同连接方式对竖向变形的影响等。分析表明,工程施工完毕时,核心筒筒体徐变变形占总变形的40%以上,并在使用阶段继续增长;徐变收缩增加了高层框架柱的轴力及竖向变形,也使得核心筒墙肢轴向力均有不同程度的减小;采用核心筒与框架梁铰接的形式大大减小了核心筒与周边框架之间因竖向变形差异产生的附加内力,也使得施工期间核心筒与周边框架分别承担竖向荷载的分担率基本保持不变。Based on the construction simulation analysis for Lanzhou Honglou Times Square, it focus on the principle of the differential shortening between columns and core-wall depending on the change of time and location. Adopting sequential construction load model, the simulation analysis considers concrete shrinkage and creep effect. It also calculates the effect of installations delay of some parts of structural components and compares the influence of different load patterns and frame beam-core wall connection modes towards vertical deformation＇. Results show the deformation caused by concrete creep will account for more than 40% of total vertical deformation of core-wall when the construction phase finish. And it will continue to increase during use period. The concrete shrinkage and creep effects cause the decrease of axial forces in core-wall and the increase of vertical deformation and axial forces in column in the same time. The adoption of hinged joint between coupling beam and shear-wall significantly decreases the additional internal force caused by differential shortening.

关 键 词：超高层建筑 竖向变形差 时间依存累加模型 混凝土 徐变收缩 加载模式 施工模拟 

分 类 号：TU974[建筑科学—建筑技术科学]