摘要
The buckling resisting brace(BRB)is an efficient system against lateral loads that enjoy high seismic energy absorption capacity.Although desirable behavior of BRBs has been confirmed,the stiffness of the system is not desirable that it can be compensated by changing the configuration of BRB braces.In so doing,the configuration in the form of double K(DK)is investigated to achieve more favorable behavior.Also,the required mathematical formulas were proposed to design the system.Comparison of DK system with other conventional BRB showed that the DK system has a better structural performance and is more economical(due to needing less core area)than other conventional BRB.Numerical results indicated that the DK system increases the lateral ultimate strength,lateral nonlinear stiffness,and energy absorption.Besides,the DK configuration reduces the axial forces created in columns in the nonlinear zone.Reducing material demand,created forces in the main frame,and also increasing of nonlinear stiffens by DK improve the structure’s safety.
防屈约束支撑(BRB)是一种能有效抵抗具有高地震能量吸收能力的侧向载荷的系统。虽然防屈约束支撑已经证实具有令人满意的行为,但系统刚度不理想,它能被防屈约束支撑的配置变化抵消。为此,研究了双K-BRB(DK)防屈约束支撑的配置,以实现更合适的行为。同时,还提出了设计该系统所需的数学公式。将DK系统与其他传统BRB进行比较,结果表明,DK系统比其他传统BRB具有更好的结构性能,且更经济(需要更少的核心面积)。数值结果表明,DK系统提高了侧向极限强度、侧向非线性刚度和能量吸收能力。此外,DK配置还减少了在非线性区域中纵向产生的轴向力。材料需求的减少、在主框架中产生的力及非线性刚度的增加提高了结构的安全性。
