高层建筑斜交网格筒结构抗侧移性能及弹塑性分析

LATERAL DISPLACEMENT RESISTANCE AND ELASTIC-PLASTIC ANALYSIS OF DIAGRID CORE-TUBE STRUCTURE IN HIGH-RISE BUILDINGS

为研究高层建筑斜交网格筒结构在多遇和罕遇地震下的抗震性能,根据广州西塔项目,建立符合我国现行GB 50011—2010《建筑抗震设计规范》的斜交网格筒结构,并建立与斜交网格筒结构材料用量相等的传统框架-剪力墙结构,在此基础上从结构的抗侧刚度、剪力滞后、内外筒体剪力和倾覆力矩分布规律以及两种结构在弹塑性阶段时塑性铰的发展破坏程度、结构倒塌机制以及结构延性进行对比分析。研究结果表明:和传统的框架-剪力墙结构相比,斜交网格筒结构的空间整体协同受力性能更强,斜交外筒对于整体刚度的作用明显,层间位移角的增长远小于传统框架-剪力墙结构。斜交网格筒结构中外筒斜柱的重要性更高,塑性铰发展数量较少、耗能能力不足,延性较差。因此,加强外筒斜柱的强度和稳定性设计是保证整体结构在罕遇地震下外筒结构不至于倒塌的关键。

In order to study the seismic behavior of diagrid core-tube structure in high-rise buildings under frequent and rare earthquakes,according to the Guangzhou West Tower project,the diagrid core-tube structure was established in accordance with the Code for Seismic Design of Buildings (GB 50011-2010). Based on the principle of equal material consumption,the traditional frame-shear wall structure with the same consumption of materials as the diagrid core-tube structure was established. On this basis,the distribution laws of lateral stiffness,shear lag,internal and external tube shear force and overturning moment of the structure,the development and failure extent of plastic hinge,the collapse mechanism and the ductility of the structure were compared and analyzed. The results showed that the diagrid core-tube structure had stronger spatial overall collaborative stress performance compared with the traditional frame shear-wall structure,and the effect of the outer tube of the inclined column on the overall stiffness was obvious,and the growth of the harmful inter-story drift ratio was far less than that of the diagrid core-tube structure. Diagrid core-tube structure had higher importance of outer tube inclined column,less plastic hinge development,less energy consumption capacity and poor ductility. Therefore,the design of strength and stability of the inclined columns of outer tube was the key to ensure that the entire structure will not collapse under the rare earthquake.