基于剪力比的防屈曲支撑-RC框架抗震设计方法研究

STUDY ON THE SEISMIC DESIGN OF BUCKLING-RESTRAINED BRACED-REINFORCED CONCRETE FRAME STRUCTURES BASED ON SHEAR FORCE RATIOS

该文提出了基于剪力比的防屈曲支撑-钢筋混凝土框架结构抗震设计方法。根据不同的剪力比α设置不同参数的防屈曲支撑并进行了多个不同层数结构的抗震设计;基于大震弹塑性时程分析,研究了不同剪力比结构的最大层间位移角和防屈曲支撑滞回耗能比随剪力比α的关系曲线,并得出剪力比α的合理取值范围为0.3<α<0.5。在剪力比合理的取值基础上研究了层间位移角最大值随不同刚度主体框架的变化规律,并建议了主体混凝土框架最大层间位移角的设计取值。该文所提方法简便、实用,为防屈曲支撑耗能减震结构的设计提供了一种新的思路。

A seismic design method based on shear force ratios of buckling-restrained braced （BRB） reinforced concrete frames （RC-BRBFs） was proposed. BRBs with different configurations were determined according to the design shear ratio a, and many RC-BRBFs with different stories were designed. Through inelastic dynamic time history analyses, the relationship curves of maximum interstory drift ratio and hysteretic energy ratio with different design shear ratios of RC-BRBFs were investigated, and the proper design shear ratio was recommended as 0.33〈a〈0.47. Based on the design shear ratio, the relationship between the maximum interstory drift ratio and main frames with different stiffness was investigated, and the recommended design value of the maximum interstory drift ratio of main reinforced concrete frame was proposed. The developed design approach is straightforward and practical, and provides a new idea for the seismic design of BRB-based energy dissipating and seismic mitigation structures.