重力柱-核心筒结构体系在某高层塔楼中的应用研究

Research on application of gravity column-core wall structure system in a high-rise tower

基于广州某300m高采用高疏柱框架-核心筒结构的办公塔楼的超限设计和《高层建筑混凝土结构技术规程》(DBJ/T 15-92—2021)的相关条文规定,研究了重力柱-核心筒结构体系在该塔楼中的应用可行性,分析了体系的应用优势和劣势。首先通过对标塔楼超限设计中的主要整体设计指标,说明重力柱-核心筒结构体系应用于该300m高的塔楼是可行的。然后对比了两种结构体系中主要结构构件截面尺寸和材料用量、施工难度等方面的差异;结果表明,与疏柱框架-核心筒结构体系相比,重力柱-核心筒结构体系有助于减小外围支承柱的截面尺寸和型钢用量,简化外环钢梁的施工难度,加快施工进度,但核心筒的抗震性能目标和楼板的构造要求有明显提高,在较大程度上降低了体系的应用优势。

Based on the over-limit design of a 300m high office tower in Guangzhou,whose structural system is the sparsecolumn frame-core tube,and the design regulations of Technical specification for concrete structures of high-rise building(DBJ/T 15-92—2021),the application feasibility of the gravity column-core tube structure system in the tower was studied,and the application advantages and disadvantages of the system were analyzed.Firstly,the main overall design indexes in the tower over-limit design were benchmarked,and it is shown that the gravity column-core tube structural system is feasible to be applied to the 300m high tower.Then,the differences in cross-sectional size,material dosage and construction difficulty of the key structural components in the two structural systems were compared.The results show that compared with the sparse column frame-core tube structural system,the gravity column-core tube structural system can help reduce the cross-sectional size and steel consumption of the peripheral supporting column,simplify the construction difficulty of the outer ring steel beam,and accelerate the construction progress,but the seismic performance target of the core tube and the structural requirements of the floor slab are significantly improved,which greatly reduces the application advantages of the system.