Theoretical and Numerical Studies of Elastic Buckling and Load Resistance of Double Cross-Arm Pre-Tensioned Cable Stayed Buckling-Restrained Braces
Theoretical and Numerical Studies of Elastic Buckling and Load Resistance of Double Cross-Arm Pre-Tensioned Cable Stayed Buckling-Restrained Braces
复制标题
双横臂预拉斜拉防屈曲支撑弹性屈曲及抗荷载理论与数值研究
DOI：
10.1016/j.engstruct.2017.10.064
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发表时间：
2017
影响因子：
5.5
通讯作者：
Peng-Peng Fu
中科院分区：
文献类型：
--
作者：
Yan-Lin Guo;Peng Zhou;Mark Andrew Bradford;Yong-Lin Pi;Jing-Zhong Tong;Peng-Peng Fu
本文研究了在纵向索桁架内沿着纵向增设横担的双横担预张拉防屈曲支撑（DPCS-BRB）的弹性屈曲性能和承载力。当然，PCS-BRB的跨度和效率可以通过采用多个横臂来增加和提高。利用平衡法推导了端部铰接的DPCS-BRB的弹性屈曲载荷公式，并通过有限元分析验证了所得结果。理论推导和有限元分析表明，DPCS-BRB分别存在单波对称屈曲和双波反对称屈曲模式。此外，在DPCS-BRB中，拉索的弹性屈曲荷载与拉索的初始预拉力之间存在负线性相关关系。此外，它已被探索，通过有限元分析，最佳的位置，以实现更高的弹性屈曲载荷以及更高的极限压缩承载能力的横臂被发现是四分之一长度的每一端的DPCS-BRB。最后，研究发现，DPCS-BRB的极限抗压承载力与其约束比成正比，且存在一个约束比下限，该下限可保证核心层达到其全截面屈服荷载而不会发生整体失稳。对DPCS-BRB的弹性屈曲性能、极限抗压承载力以及破坏机理的研究为进一步发展轴向循环荷载作用下DPCS-BRB的综合设计方法提供了基础。
This paper investigates the elastic buckling behaviour and load resistance of a double cross-arm pre-tensioned cable stayed buckling-restrained brace (DPCS-BRB) where an extra cross-arm is assigned within a longitudinal cable truss along its length. Naturally, the span and efficiency of the PCS-BRB can be increased and improved by adopting multiple cross-arms. Equilibrium method is utilised to derive the formula of elastic buckling load of a pin-ended DPCS-BRB, and the obtained results have been verified through FE analysis. It is found from theoretical derivations and FE analysis that there exists a single-wave symmetric and double-wave antisymmetric buckling modes in the DPCS-BRB, respectively. In addition, a negative linear correlation exists between the elastic buckling load and the initial pre-tensioning force of the cables in the DPCS-BRB. Furthermore, it has been explored through FE analysis that the optimal location of the cross-arms for achieving higher elastic buckling load as well as higher ultimate compressive load-carrying capacity is found to be a quarter length to each end of the DPCS-BRB. At last, the ultimate compressive load-carrying capacity of the DPCS-BRB is found to be directly proportional to its restraining ratio, and there exists a lower limit of the restraining ratio which ensures the core could reach its full cross-sectional yield load without overall instability of the DPCS-BRB. The investigation of the elastic buckling behaviour and ultimate compressive load-carrying capacity as well as the failure mechanism of the DPCS-BRB provides fundamentals to the further development of a comprehensive design method of the DPCS-BRB subjected to axial cyclic loads.