【摘要】 以碳云大厦复杂双塔连体结构为研究对象，详细介绍了结构体系构成、荷载作用取值及抗震性能目标，针对大跨空间斜向弧形连接体设计、塔楼V柱/Y柱转换等关键问题展开研究。采用连接体方案(铰接/刚接/斜腹杆桁架)比选、空间协同受力分析、自平衡设计、包络设计(单/双塔计算模型，关键部位楼板刚度退化与不退化，关键构件、节点混凝土弹性模量折减与不折减)、抗震性能化设计、实体有限元分析、针对性构造措施加强等方法与手段开展设计。结果表明：中高位连接体“多腔宽扁箱形梁+多销轴复合销节点”体系、低位连接体空腹桁架体系可有效解决异形连接体受力难题，连接体铰接连接方式可避免塔楼结构刚度突变，使塔楼层间位移角及层剪力分布更合理；“V柱-拉梁-核心筒”“Y柱-环梁-核心筒”转换体系具有足够的承载能力和可靠的稳定性，能平衡角部V柱水平外推力、满足Y柱受力要求，转换框架承担了40%～75%的地震剪力。更多还原

【Abstract】 Taking the complex twin-tower connected structure of Icarbonx project as the research object, the structural system composition, load action values and seismic performance objectives were detaily introduced. Key issues such as the design of large-span spatial oblique curved connectors and the transfer of tower V-columns/Y-columns were focused on. Methods including comparative analysis of connection schemes(hinged/rigid/diagonal truss), spatial collaborative force analysis, self-balancing design, envelope design(single/twin-tower calculation models, degradation and non-degradation of key floor slab stiffness, reduction and non-reduction of concrete elastic modulus for critical components and joints), performance-based seismic design, solid finite element analysis and targeted structural detailing measures were employed. The results show that, the "multi-cavity wide flat box girder + composite multi-pin joint" system for middle-high connectors and the vierendeel truss system for low connectors effectively solve the stress problems of special-shaped connectors. The hinged scheme of connectors avoids abrupt change in tower stiffness, making the inter-story drift angle and story shear distribution of the twin towers more reasonable. The transfer systems of "V-column-tie beam-double core tube" and "Y-column-ring beam-core tube" demonstrate sufficient load-bearing capacity and reliable stability, can balance the horizontal thrust of the corner V-columns and meet the bearing capacity requirements of Y-columns, with the transfer frames bearing 40%～75% of seismic shear force.更多还原