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为研究高层组合框架-混凝土筒体混合结构的动力性能,以某30层混合结构为分析对象,建立整体空间有限元模型,进行模态与弹性时程分析。分析结果表明:外框架与筒体之间连接方式对混合结构的周期与振型影响较明显。地震作用下的层间位移角极值发生在混合结构的中上部楼层,沿结构高度楼层加速度的分布有两个极值区,框架所负担的层间剪力比例较小,但外框架承担的层间弯矩较大;改变连接方式使结构变形与内力分布发生显著变化。
In order to study the dynamic performance of the high-rise composite frame-concrete hybrid structure, a 30-layer mixed structure was taken as the analysis object to establish the overall space finite element model for modal and elastic time-history analysis. The analysis results show that the connection between the outer frame and the cylinder has obvious influence on the period and vibration mode of the hybrid structure. The extremum of the layer displacement under earthquake action occurs in the middle and upper floors of the hybrid structure. There are two extreme values of the distribution of acceleration along the height of the structure, and the proportion of the interbed shear stress borne by the frame is small. However, The bending moment between layers is larger. Changing the connection mode makes the structural deformation and internal force distribution change significantly.