四塔支承超大直径圆环复杂结构设计

Design of a Complex Structure with Supersize Circular Ring Supported by Four Towers

上海临港新片区新建一幢地标建筑,该建筑为四幢46.8 m高的塔楼支承一个直径150 m、高度8.6 m的超大直径圆环,结构复杂。结构主要特点是超大直径圆环内侧采用倒三角形空间桁架、楼面梁采用变截面悬挑钢梁,四幢塔楼采用钢框架-屈曲约束支撑-屈曲约束钢板墙结构体系,超大直径圆环和四幢支承塔楼之间采用一个对角铰接、另一个对角滑动支座加黏滞阻尼器的连接方式。由于建筑师的要求,超大直径圆环横截面为外侧开口的C形截面,如何克服圆环外侧开口带来的扭转作用是设计难点。主要进行了支承塔楼的结构设计和计算分析,超大直径圆环的结构选型和抗扭性能研究,圆环和支承塔楼连接设计,支承塔楼和圆环组成的整体结构计算分析,整体结构大震下弹塑性时程分析。设计和研究成果可为圆环结构、多个塔楼共同支承一个上部结构等类似工程设计提供借鉴。

A landmark building has been newly built in the Lingang New Area of Shanghai,which consists of four 46.8 m high towers supporting a super large circular ring with a diameter of 150m and a height of 8.6m,forming a complex structure.The main characteristics of the structure are that the inner side of the ultra large diameter circular ring adopts an inverted triangular spatial truss,the floor beam adopts a variable cross-section cantilever steel beam,and the four towers adopt a steel frame-BRB-BRW structure system.The connection between the ultra large circular ring and the four supporting towers adopts a diagonal hinge,and another diagonal sliding supports with viscous dampers.The cross-section of the ultra large diameter circular ring is a C-shaped section with an outer opening due to the requirements of the architect,and how to overcome the torsional effect caused by the outer opening of the circular ring is the difficulty in design.The main work contains structural design and calculation analysis of the supporting tower,structural selection and torsional performance research of the ultra large diameter circular ring,connection design between the circular ring and the supporting tower,calculation analysis of the overall structure composed of the supporting towers and the circular ring,and elastic-plastic time history analysis of the overall structure under rare earthquakes.The design and research results of this project can provide reference for similar engineering design such as circular ring structure,multiple towers supported upper structure,etc.