广州西塔抗侧力结构超强能力分析  

Analysis on seismic superstrength capacity of lateral force resistance structure of Guangzhou West Tower

作　　者：方小丹[1,2] 张浩鹏 凌育洪 周靖[1,3] FANG Xiaodan;ZHANG Haopeng;LING Yuhong;ZHOU Jing(State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,China;Architectural Design and Research Institute of South China University of Technology,Guangzhou 510640,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,China;Sino-Singapore International Joint Research Institute,Guangzhou 510640,China)

机构地区：[1]华南理工大学亚热带建筑与城市科学全国重点实验室,广东广州510640 [2]华南理工大学建筑设计研究院有限公司,广东广州510640 [3]华南理工大学土木与交通学院,广东广州510640 [4]中新国际联合研究院,广东广州510640

出　　处：《建筑结构学报》2024年第5期42-54,共13页Journal of Building Structures

基　　金：国家自然科学基金项目(52378512,12172135);广东省自然科学基金项目(2022A1515010878);亚热带建筑与城市科学全国重点实验室项目(2021Z12)。

摘　　要：为了分析广州西塔模型结构振动台试验在9度罕遇地震作用后损伤较小的主要原因,研究抗侧力结构的抗震超强能力,以及验证广东省标准DBJ/T 15-92—2021《高层建筑混凝土结构技术规程》(简称“《省高规》”)抗震设计反应谱的安全可靠性,采用广州西塔原型结构(简称“GZTP结构”)以及基于《省高规》重新进行抗震设计的结构(简称“NGZT结构”),进行反应谱分析、弹性和弹塑性动力时程分析,分析基于GB 50011—2010《建筑抗震设计规范》抗震设计反应谱、《省高规》抗震设计反应谱计算的楼层剪力、倾覆力矩分布模式的差异及其主要原因,并计算抗侧力结构的超强系数。分析结果表明,GZTP结构(风荷载控制设计的抗侧力体系)实际具备了“大震不坏”的抗震能力;GZTP结构基于倾覆力矩的超强系数为7.6,弹塑性增量动力时程分析确定的基底屈服倾覆力矩超过8度罕遇地震作用的弹性抗震需求,能够解释7度抗震设防的GZTP结构在9度罕遇地震作用后刚度退化小,未出现明显损伤破坏的振动台试验结果;NGZT结构基于倾覆力矩的超强系数为10.3。This paper analyzes the main reasons for the minor damage to the Guangzhou West Tower model structure after encountering a rare earthquake of intensity nine in the shaking table test.The overstrength capacity of the lateral force-resisting system of the West Tower structure was studied.The safety and reliability of the seismic design spectrum in the DBJ/T 15-92—2021‘Technical specification for concrete structures of tall building’in Guangdong Province(referred to as Provincial standard)were verified.Using the GuangZhou West Tower Prototype structure(referred to as“GZTP structure”)and the corresponding redesigned structure based on the Provincial standard(referred to as“NGZT structure”),the response spectrum analysis and the elastoplastic dynamic time history analysis were carried out.The differences between the story shear force and overturning moment calculated based on the seismic design spectrum in the GB 50011—2010‘Code for seismic design of buildings’and that in the provincial standard were discussed,with their reasons explained and the corresponding overstrength coefficients of the lateral force-resisting systems determined.The results show that the GZTP structure with the lateral force-resisting system designed by wind-load control has a seismic capacity of“not damage encountering rare intensity earthquake”.The overstrength coefficient of GZTP structure is 7.6 based on overturning moment.The yielding overturning moment at structural base,determined by the elastoplastic incremental dynamic time history analysis,exceeds the elastic seismic demand for a rare earthquake of intensity eight.This explains that the GZTP structure with the seismic fortification demand of intensity seven had little stiffness degradation without apparent damage after encountering a rare earthquake of intensity nine in the shaking table test.Moreover,the overstrength coefficient of NGZT structure is 10.3 based on overturning moment.

关 键 词：广州西塔 抗侧力结构 反应谱 时程分析 超强能力 

分 类 号：TU973.213[建筑科学—结构工程]