广东地方标准与《抗规》反应谱的对比及长周期结构影响分析  

Comparison of response spectra between Guangdong local standards and seismic code and analysis of their effects on long⁃period structures

作　　者：徐平辉 倪取佳 XU Pinghui;NI Qujia(Guangzhou BXHH Architects&Engineers Ltd,Guangzhou 510030,China)

机构地区：[1]广州宝贤华瀚建筑工程设计有限公司,广州510030

出　　处：《建筑结构》2023年第22期104-111,共8页Building Structure

摘　　要：对广东地方标准《高层建筑混凝土结构技术规程》(DBJ/T15-92—2021)、《建筑工程混凝土结构抗震性能设计规程》(DBJ/T 15-151—2019)及《建筑抗震设计规范》(GB 50011—2010)三本规范抗震设计反应谱的标定方式、反应谱曲线及主要控制参数进行了对比,阐述了三者之间的异同,其中谱值差异最大的是位移段;通过不同算例的对比分析指出,《抗规》反应谱位移段谱值整体抬高是长周期结构低阶振型的谱值及低阶振型对基底剪力的贡献均与广东《高规》差异巨大的根本原因,亦是两者楼层剪力分布形态、倾覆力矩均差异大的主要原因。基于对比结果探讨了相对《抗规》整体抬高反应谱位移段谱值(辅助小震最小剪力系数规定)的处理方式,广东《高规》中震最小剪力系数规定及楼层剪力的调整方式或与《抗规》避免长周期结构计算剪力过小的出发点更吻合。The calibration methods,response spectrum curves and main control parameters of the seismic design response spectra of three codes(including the Guangdong local standard Technical specification for concrete structures of tall building(DBJ/T 15-92—2021),Specification for performance-based seismic design of reinforced concrete building structure(DBJ/T 15-151—2019)and Code for seismic design of buildings(GB 50011—2010))were compared,and the similarities and differences between them were explained.The largest difference in spectral values is the displacement section.Through comparison and analysis of different calculation examples,it is pointed out that the overall elevation of the spectral value of the displacement section of the response spectrum in the seismic code is the fundamental reason why the spectral value of the low order vibration mode of long-period structures and the contribution of the low order vibration mode to the base shear force are greatly different from those in the Guangdong code,and it is also the main reason why the distribution pattern of the story shearing force and the overturning moment of the two are greatly different.Based on the comparison results,it is discussed that the processing method of the spectral value of the displacement section of the response spectrum(combined with the minimum shear coefficient provisions for frequent earthquake)of the overall uplift response spectrum in the seismic code,the minimum shear coefficient provisions for intermediate earthquake in the Guangdong code and the adjustment method of the story shear force are more consistent with the purpose of the seismic code to avoid too small calculated shear force for long-period structures.

关 键 词：抗震设计反应谱 标定方式 反应谱曲线 长周期结构 低阶振型谱值 楼层剪力分布形态 倾覆力矩 

分 类 号：TU375[建筑科学—结构工程]