宁波环球航运广场抗震超限结构设计

Design of seismic and ultra-limit structure in Ningbo Global Shipping Plaza

宁波环球航运广场主楼为带混凝土筒体的钢混巨型结构体系,结构采用两侧筒体+中央大桁架结构形式。X向水平力由巨型桁架协调两个混凝土筒体共同承担,Y向水平力由两个混凝土筒体共同承担,两侧筒体主要为内设型钢的钢筋混凝土结构形式。除判断位移比采用刚性板模型外,其余指标的判定均应基于弹性楼板模型。从楼层刚度分布来看,在桁架层及相邻楼层、层高变化较大处,楼层出现较大刚度差异,设计时将桁架层设置为薄弱层,以加强构造措施。混凝土筒体内对应桁架位置设置劲性钢骨与桁架弦杆连接,桁架贯通对应的水平剪力墙,即在剪力墙内设置暗桁架,同时暗支撑延伸到上下各一层,以保障传力的可靠性。

the main building of Ningbo world shipping Plaza is a steel reinforced concrete mega structure with concrete cylinder. The structure is composed of two cylinders and a central large truss structure. The horizontal force is shared by two concrete cylinders by the mega trusses, and the Y horizontal force is jointly undertaken by two concrete cylinders, and the two sides of the cylinder are mainly reinforced concrete structures of the internal type steel. In addition to judging displacement ratio using rigid plate model, the other criteria should be based on elastic floor model. From the floor stiffness distribution, the truss layer and the adjacent floor and storey height vary greatly. There is a larger stiffiaess difference in the floor. The truss layer should be set as a weak layer to strengthen the structural measures. The position of the corresponding truss in the concrete cylinder is connected with the stiffened steel bone and the truss string. The truss is connected with the corresponding horizontal shear wall, that is, the dark truss is set in the shear wall, while the dark support extends to the upper and lower layers to ensure the reliability of the force transmission.