基于刚度和位移带可更换构件RCS混合框架结构抗震设计方法

SEISMIC DESIGN METHOD OF RCS HYBRID FRAME STRUCTURE WITH REPLACEABLE MEMBERS BASED ON STIFFNESS AND DISPLACEMENT

带可更换构件的RCS混合框架结构作为一种新型的可恢复功能结构,其抗震设计方法尚不明确。基于其结构受力特性及现行抗震规范中性能水准的划分,提出了正常使用、耗能构件可更换、主框架可修复、生命安全及防止倒塌等5个性能水准,明确了结构在不同性能水准下的受力状态和指标限值。将弹性刚度比和屈服位移比作为结构设计控制参数,提出了基于双参数的带可更换构件RCS混合框架结构抗震设计方法,并给出了抗震设计的具体实施步骤和构件截面设计方法。通过非线性静力分析及动力时程分析,对一幢3层带可更换构件的RCS混合框架结构进行抗震设计。分析结果表明:结构能满足预期的不同性能水准,所提抗震设计方法是有效性的。

The RCS hybrid frame structure with replaceable components is a new type of earthquake resilient structure, whose seismic design method is unclear yet. To explore the seismic design method of the RCS hybrid frame structure, five performance levels available for the RCS hybrid frame are proposed. These levels consist of towering the purpose of normal use, replaceable energy-dissipation members, repairable main frame, life safety and collapse prevention, based on the mechanical behavior of the RCS hybrid frame structure and the division of performance levels in China seismic code. And the stress states and parameters limit of structure at different performance levels are also defined. The elastic stiffness ratio and yield displacement ratio are proposed as parameters to control the behavior of the hybrid frame structure, and the steps of seismic design program of the structure and the design method of the component section are also developed. An example of the seismic design of a 3-story RCS hybrid frame structure with replaceable components is carried out by nonlinear static analysis and by dynamic time-history analysis. The structure can meet the performance levels and the seismic designmethod is effective.