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中海油(深圳)大厦裙房是总高度为24.5m的大跨结构,位于两栋超高层塔楼之间。为满足市政规划及建筑功能提出的结构内部需具备33.6m无柱空间、结构周边双向需分别提供50.4m及27.6m大跨空间的要求,结构设计时提出了一种新型结构体系:型钢混凝土框架-四角筒-双向钢桁架混合结构体系,其中剪力墙筒体和型钢混凝土框架柱作为竖向抗侧力构件,跨层钢桁架实现了竖向抗侧力构件之间的水平力传递,并为梁、楼板的合理布置提供了条件。采用有限元分析方法对此结构进行了罕遇地震作用下的弹塑性时程反应分析,计算结果表明,新型型钢混凝土框架-四角筒-双向钢桁架混合结构体系的结构位移满足规范限值要求,四角筒的损伤主要集中在连梁处,大跨桁架保持不屈服,混凝土梁及钢梁的损坏有效耗散了地震输入能量,证明了此结构布置的合理性。
CNOOC (Shenzhen) Building Podium is a total span of 24.5m long-span structure, located between two super-tall towers. In order to meet the requirements of municipal planning and building functions, a 33.6m non-pillar space is required inside the structure, and the requirements of 50.4m and 27.6m long span respectively are required in the bidirectional structure around the structure. A new structural system is proposed when structural design is adopted: a steel reinforced concrete frame - Square-tube-two-way steel truss composite structure system, in which the shear wall cylinder and steel reinforced concrete frame column act as the vertical anti-side-force component, and the cross-section steel truss realizes the horizontal force transmission between the vertical anti-side-force components For the beam, the rational provision of floor conditions. The finite element analysis method was used to analyze the elasto-plastic time-history response of the structure under rare earthquakes. The calculated results show that the structural displacement of the new type steel reinforced concrete frame-tetragon-steel bidirectional steel truss hybrid structural system meets the specification limits, The damage of the square tube mainly concentrates on the joint beam, and the long-span truss keeps not yielding. The damage of the concrete beam and the steel beam effectively dissipates the input energy of the earthquake, which proves the rationality of this structure arrangement.