大跨度斜拉结构在上海美的全球创新园区中的设计与应用
The Design and Application of Long-Span Cable-Stayed Structure in Midea Shanghai Innovation Campus
上海美的全球创新园区以两座相互咬合的L形塔楼组成,每座塔楼分别以7个钢筋混凝土核心筒支撑,悬浮于空中。筒体间纵向设置大跨度斜拉结构,端部设置46 m大跨悬挑桁架,中部纵向结构向两翼设置悬挑的扁担式桁架,通过托柱和吊柱构建各层框架结构。结构借鉴斜拉桥的思路,采用斜拉索与桁架相结合的方式,并对斜拉索施加预应力,减小大跨斜拉结构的变形和内力。整体结构体系新颖,属于规范未列入的特殊类型超限高层建筑。设计设定了较高的抗震性能目标,并通过详细的计算分析和技术论证,验证了结构体系的合理性和防连续倒塌能力,实现了预设的抗震设防目标。针对双索与结构的特殊连接节点,进行了有限元细化分析和足尺节点试验,验证了节点的安全性和可施工性。进行了模拟施工分析,验证施工可行性,并确定分批张拉的控制索力,为施工提供支撑。
The Midea Shanghai Innovation Campus comprises two interlocking L-shaped towers supported by seven reinforced concrete core tubes. Long-span cable-stayed structures are longitudinally arranged between these tubes. A 46-meter-span cantilever truss is positioned at the tower end, while additional cantilever trusses extend laterally from the central longitudinal structure to both wings, forming the building’s frame structure. This structural design draws inspiration from cable-stayed bridge principles, integrating cable-truss combinations within the building. By applying prestress to the cables, structural deformation and internal forces are reduced. The system is novel and falls under the category of special over-limit high-rise structures not covered by existing national codes. A higher seismic performance objective was adopted, necessitating comprehensive analysis and validation to achieve targets. To verify the safety and constructability of cable-frame connections, detailed finite element analysis and a full-scale joint test were conducted. Furthermore, construction process simulation analysis was performed to verify feasibility and determine prestressing force controls for each construction stage.
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