典型框筒结构加强层楼板刚度折减系数研究

Research on the stiffness reduction factor of the floors at strengthened story in typical frame-tube structures

在框筒结构中，加强层楼板对结构的整体抗震性能影响显著。以结构高度为248．2m典型框筒结构为例，采用ABAQUS软件对加强层楼板进行弹塑性分析，得到了楼板裂缝扩展情况，并分析了楼板配筋率、框架受力状况及楼板厚度对加强层刚度的影响。最后，通过弹塑性楼板模型与不同弹性楼板等效刚度折减系数的弹性楼板模型进行对比，给出了不同情况下结构整体分析时弹性楼板等效刚度折减系数的合理取值。

The floors at strengthened story are significant effect on the seismic performance in frame-tube structures. A typical 248. 2 meters high frame-tube structure was taken as an example, the elastoplastic properties of the floors at strengthened story using ABAQUS were analyzed to get the development of cracks in the floors, and the influence of the reinforcement ratio of the floor, the frame force situation and the thickness of the floor on the stiffness of the strengthened story were analyzed. At last, the reasonable stiffness reduction factor of the elastic floors under different conditions were proposed through comparing the elastoplastic floor model with the elastic floor model using different stiffness reduction factor.