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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 simulation of the construction process of Times Square in Lanzhou Red House, the vertical and vertical deformation differences between the tall building frame columns and the reinforced concrete cylinder with time and space are analyzed. In the analysis, a time-dependent additive model was used to account for the creep, shrinkage and strength increase in the concrete properties, and the effect of delayed installation of some components (such as the strengthening arm) on the overall model was taken into account. The effects of different loading modes, different connection modes of beam ends and core tube on vertical deformation of frames were compared. The analysis shows that the creep deformation of the core barrel accounts for more than 40% of the total deformation at the completion of the construction and continues to increase during the use phase. Creep shrinkage increases the axial force and vertical deformation of the tall frame column, The axial force of the wall limbs are reduced to varying degrees; the use of core tube and frame beam hinged form greatly reduces the core tube and the surrounding frame due to the difference between the vertical deformation of the additional internal force, but also makes the core tube during construction and Peripheral frame to bear the share of vertical load basically remained unchanged.