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以高1 180m的中国建筑千米级摩天大楼为载体,在3个周边单塔+中央交通核每100m通过2层共15m高连接平台刚性连接的连接平台楼层、3个周边单塔上设置7种不同伸臂桁架方案,来研究伸臂桁架对结构刚度、刚重比、周期、楼层剪力、位移及框架承担剪力占基底剪力百分比等结构设计控制指标的影响。研究结果表明:伸臂桁架对结构的平动刚度影响较大,对扭转刚度影响较小;可显著提高结构整体刚度,增大结构的刚重比;伸臂桁架对结构的楼层剪力影响不大;可有效减小结构的楼层位移角,对这种巨型组合结构体系的底部加强部位框架承担剪力占基底剪力百分比的影响甚微。
Take the 1 180m high-rise Chinese-built kilometer-skyscraper as the carrier, connect the 3 surrounding single towers + central transportation core through the 2-story connecting platform with a total height of 15m, Different kinds of boom trusses scheme to study the influence of the boom of truss on the structural design control indexes such as the structural rigidity, the weight-to-weight ratio, the periodicity, the floor shear force, the displacement and the percentage of the shear force that the frame takes up the shear force. The results show that: the boom of truss has a great influence on the translational stiffness of the structure and has little effect on the torsional stiffness; it can significantly increase the overall stiffness of the structure and increase the weight-to-weight ratio of the structure; Which can effectively reduce the floor displacement angle of the structure and has little effect on the shear percentage of the base shear strength of the frame of the bottom reinforced part of such a huge composite structural system.