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成都传媒中心大厦是由一组交错布置的裙房和超高层办公塔楼组成的不规则结构,外立面为三角形网格。结构利用建筑立面造型的三角形网格,形成具有良好承受水平和竖向荷载能力的空间外框筒结构体系,内部则采用框架结构体系。从结构受力特点、节点构造设计、抗震性能、施工可行性等方面对外框筒结构选型进行了综合比较分析,外框筒主结构体系采用钢结构。对内部有无核心筒进行了对比分析,计算表明可以取消内部核心筒。通过对钢结构、钢筋混凝土结构以及钢骨混凝土结构三种方案结构选型综合分析,钢结构方案结构性能最优。最后专门对钢结构方案进行了Push-over抗震性能分析,在7度罕遇地震性能点,结构构件仍处于弹性状态,无塑性铰出现,结构的最大的层间位移角发生在结构立面收进位置,且都能满足规范的变形要求。对结构进行继续加载,主要出铰位置为结构外框的角部及外框收进开洞部位,随后结构的部分梁出现塑性铰,柱无塑性铰出现,满足“强柱弱梁”。当结构的顶点位移达到结构罕遇地震时的5倍时结构最大层间位移角超过1/50,结构倒塌,因此结构从设防烈度到罕遇地震再到倒塌结构有较大的变形能力和很高的安全储备,完全能满足结构“大震不倒”。结果表明,采用外框筒-内框架钢结构方案具有良好的抗震性能。
Chengdu Media Center Building is an irregular structure composed of a group of staggered podiums and super high-rise office towers with a triangular grid on the façade. The structure uses a triangular grid of building facades to form a space outer frame structure system with good horizontal and vertical load carrying capacity and a frame structure system inside. From the characteristics of the structure of the force, the node structure design, seismic performance, construction feasibility and other aspects of the outer frame structure selection of a comprehensive analysis, the outer frame of the main structural system using steel. On the internal core tube were analyzed, the calculation shows that you can cancel the internal core tube. Through the comprehensive analysis of steel structure, reinforced concrete structure and steel-concrete structure three options, the structure of the steel structure has the best performance. Finally, the Push-over seismic performance analysis of the steel structure scheme was carried out. At the point of rare earthquakes of 7 degrees, the structural members are still in elastic state and no plastic hinges appear. The maximum inter-story drift angle of the structure occurs in the structural facade Into the position, and can meet the specifications of the deformation requirements. Continue to load the structure, the main hinge position for the frame and the outer corner of the frame into the hole, then part of the structure of the plastic hinge appears, the column does not appear plastic hinge to meet the “strong column weak beam” . When the displacement of the structure reaches 5 times of the rare earthquakes, the maximum displacement angle of the structure exceeds 1/50 and the structure collapses. Therefore, the structure has great deformation ability from fortification intensity to rare earthquake to collapse structure High safety reserves, fully able to meet the structure “earthquake does not fall ”. The results show that the outer frame - the framework of the steel framework has good seismic performance.