基于抗规和隔规的RC框架-核心筒隔震结构设计方法对比研究

Comparison on seismic isolation design methods of RC frame-core tube isolation structure based on "Code for seismic design of buildings" and "Standard for seismic isolation design of building"

以RC框架-核心筒高层隔震结构为研究对象,基于《建筑抗震设计规范》(GB 50011—2010)和《建筑隔震设计标准》(GB/T 51408—2021)两种规范,研究了两种规范不同隔震设计方法对结构关键设计指标的影响,明确了《建筑隔震设计标准》(GB/T 51408—2021)隔震设计方法的设计控制指标,对比分析了两种规范设计的隔震结构的关键结构响应。研究结果表明,《建筑隔震设计标准》(GB/T 51408—2021)隔震设计方法的控制指标为层间位移角。对于相同的上部结构和隔震方案,与《建筑抗震设计规范》(GB 50011—2010)的隔震设计方法相比,采用《建筑隔震设计标准》(GB/T 51408—2021)隔震设计方法,底部剪力比由0.377减小到0.342,中震作用下最大层间位移角降低12.0%,大震作用下最大层间位移角降低8.5%。采用《建筑隔震设计标准》(GB/T 51408—2021)进行结构设计时,上部结构可以采用更柔的设计方案。

Taking the RC frame-core tube high-rise seismic isolation structure as the research object, based on the "Code for seismic design of buildings"(GB 50011—2010) and "Standards for seismic isolation design of buildings"(GB/T 51408—2021) these two codes, the influence of different seismic isolation design methods in two codes on the key design indicators of the structure were studied. The design control indicators of the seismic isolation design methods in "Standards for seismic isolation design of buildings"(GB/T 51408—2021) were clarified. The key structural response of the designed seismic isolation structure of the two codes were compared and analyzed. The research results show that the control index of the seismic isolation design method of "Standards for seismic isolation design of buildings"(GB/T 51408—2021) is the inter-story drift ratio. For the same superstructure and seismic isolation scheme, compared with the seismic isolation design method of "Code for seismic design of buildings"(GB 50011—2010), adopting the seismic isolation design method of "Standards for seismic isolation design of buildings"(GB/T 51408—2021), the base shear ratio decreased from 0.377 to 0.342, the maximum inter-story drift ratio decreased by 12.0% under moderate earthquake, and the maximum inter-story drift ratio decreased by 8.5% under large earthquake. When "Standards for seismic isolation design of buildings"(GB/T 51408—2021) is adopted for structural design, a more flexible design scheme can be adopted for the superstructure.