组合抗侧体系在大高宽比和长宽比超高层钢结构建筑中的应用与试验研究

Application and experimental study of combined lateral resistant system in super high-rise steel structure with large aspect ratio and length-width ratio

大高宽比和长宽比高层建筑具有抗侧力效率低、结构扭转振动控制难度大以及风振舒适度控制难度大等典型特点,选择高效的抗侧力体系方案,并控制抗侧力构件在各级超越概率地震作用下的合理屈服机制是该类建筑设计需考虑的关键问题。以南京市某超高层钢结构建筑为工程背景,经多方案比选研究,采用钢框架-钢支撑-钢板墙组合抗侧结构体系,对组合抗侧结构体系进行了分析和性能研究,并对该体系中的大高宽比钢管混凝土端柱-钢板剪力墙消能减震子结构进行了试验研究。研究表明:通过合理布置抗侧力构件,组合抗侧体系可以满足大高宽比、大长宽比条件下结构的刚度和扭转控制要求,满足结构预定的抗震性能目标并可实现结构抗震防线的有序可控退化。钢板墙结构总体表现出较高的承载能力和充足的延性,实现了钢板剪力墙结构“优先屈服”和“高耗能”的设计理念。

High-rise building with large aspect ratio and length-width ratio has the typical characteristics of low efficiency of resisting lateral force,difficulty in controlling torsional vibration and difficulty in ensuring wind vibration comfort.The key issues to be considered in the design of this kind of building are the selection of efficient lateral force resistance system scheme and the reasonable yield mechanism of the lateral force resistance system under earthquake actions associated with different level of exceeding probabilities.For a super high-rise steel structure building in Nanjing,the combined lateral resistant system composed of steel frames,steel braces and steel shear walls was adopted after multiple schemes comparison.The analysis and performance study were conducted on the combined lateral resistant system.The experimental study was conducted on a sub-structure consisted of concrete-filled steel tube column and steel plate shear wall with large aspect ratio as well.The results show that the combined lateral resistant system can meet the stiffness and torsion control requirements of structures with large aspect ratio and length-width ratio,meet the predetermined seismic performance objectives of structures,and realize orderly and controllable degradation of seismic defenses by arranging the lateral force resistant members reasonably.The steel plate shear wall structure has high bearing capacity and sufficient ductility,and the design concept of‘preferential yield’and‘high energy consumption’is realized.