Elastic buckling and load resistance of a single cross-arm pre-tensioned cable stayed buckling-restrained brace
Elastic buckling and load resistance of a single cross-arm pre-tensioned cable stayed buckling-restrained brace
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DOI：
10.1016/j.engstruct.2016.08.013
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发表时间：
2016-11
影响因子：
5.5
通讯作者：
Yan-lin Guo;Peng-Peng Fu-Peng;Peng Zhou;J. Tong
中科院分区：
文献类型：
--
作者：
Yan-lin Guo;Peng-Peng Fu-Peng;Peng Zhou;J. Tong
本文提出了一种新型的抗屈曲支撑（BRB），即预应力斜拉索抗屈曲支撑（PCS-BRB），它是通过在普通BRB的外部引入额外的预应力斜拉索结构体系和一些交叉臂而形成的。这种新系统显著提高了BRB的整体外约束刚度，从而提高了其结构设计的承载效率。由于其美观的结构，它可以用于体育场馆等作为横向抗支撑。利用平衡法推导了销端预应力混凝土梁的弹性屈曲载荷计算公式。通过弹塑性范围内的有限元分析，研究了约束比和初始预张拉力对预应力混凝土-混凝土混凝土轴压承载能力的影响。研究结果表明，PCS-BRB可能存在单波对称屈曲和双波反对称屈曲两种不同的屈曲模式。理论分析和数值分析表明：索的弹性屈曲载荷与初始预张紧力呈负线性相关；斜拉索体系的几何参数对其弹性屈曲载荷有显著影响。此外，PCS-BRB的屈服后行为和极限抗压承载力与约束比成正比，并且存在一个约束比的下限，使PCS-BRB在不发生整体失稳破坏的情况下实现内芯的全截面屈服。此外，存在一个最优的初始预张拉力，使预应力混凝土- brb的承载能力达到最大值。对聚苯乙烯- brb弹性屈曲和抗载性能的研究，为进一步建立完整的聚苯乙烯- brb设计方法提供了基础。
This paper proposes a new type of buckling-restrained braces (BRB), namely a pre-tensioned cable stayed buckling-restrained brace (PCS-BRB) which is formed through introducing an additional structural system of pre-tensioned cables and a number of cross-arms to the outside of a common BRB. This new system significantly improves the BRB’s overall external restraining stiffness, hence increasing the load-carrying efficiency in its structural design. Due to its aesthetically appealing structure, it can be utilised in stadiums and so forth as a laterally resistant brace. Equilibrium method is utilised to deduce formulas of elastic buckling load of pin-ended PCS-BRB. The restraining ratio and the initial pre-tensioning force of cables are investigated to explore the effect on the axial compressive load-carrying capacity of the PCS-BRB through finite element analyses in elastic-plastic range. The findings indicate that two different types of buckling modes may occur in this PCS-BRB, namely single-wave symmetric and double-wave antisymmetric buckling modes. It was found from theoretical and numerical analyses that: a negative linear correlation exists between elastic buckling load and initial pre-tensioning force of the cables; the geometric parameters of the cable stayed system possessed remarkable effect on the elastic buckling load. In addition, the post-yield behaviour and ultimate compressive load-carrying capacity of the PCS-BRB is directly proportional to the restraining ratio, and there exists a lower limit of the restraining ratio which allows the inner core to reach full cross-sectional yielding without overall instability failure of the PCS-BRB. Furthermore, there exists an optimal initial pre-tensioning force of cables to make the load-carrying capacity of the PCS-BRB to reach a maximum value. The investigation of elastic buckling and load resistance of PCS-BRB provides fundamentals to further develop a complete design method of PCS-BRB.