超高层巨型管柱桁架加工制作技术

RESEARCH ON MANUFACTURING TECHNIQUES OF MEGA TUBE-COLUMN TRUSS OF SUPER HIGH-RISE BUILDINGS

巨型管柱桁架主要是伸臂桁架、腰桁架,在外框柱与核心筒之间设置伸臂桁架可减小结构侧移,通过提高水平荷载作用下的外框架柱的轴力,增加框架承担的倾覆力矩,同时减小了内核心筒的倾覆力矩。对于框架核心筒结构,设置伸臂桁架后侧移减小显著;而对于筒中筒结构而言,侧移减小的效果不明显。在结构周围设置腰桁架可使各框架柱承受的轴力均匀变化,因此也可以达到提高外框架抗倾覆力矩的能力以及减小侧移的目的。超高层建筑结构可以根据具体情况,同时设置伸臂桁架和腰桁架。

Mega tube-column truss is composed of outrigger truss and belt truss,the outrgger truss between outer frame column and core tube can reduce the lateral displacement of structure. By increasing the axial force of the outer frame column under horizontal load,the overturning moment of the frame increased,while the overturning moment of the core tube decreased. Outrigger truss could reduce the lateral displacement of the frame-core wall structure,however,it had little effect on the lateral displacement of tube-in-tube structure. The role of belt truss around the structure was to ensure that the axial force acting on each frame column changed uniformly,so as to improve the capacity to resist overturning moment for outer framework and reduce the lateral deformation. The research results showed that outrigger truss and belt truss could be simultaneously applied in super high-rise buildings in specific situations,outrigger truss and belt trusses would be the most critical members of super high-rise buildings as well as the main force-bearing parts of the structure.