Steel rigid beam-to-column connections strengthened by buckling-restrained knee braces using round steel core bar dampers
Steel rigid beam-to-column connections strengthened by buckling-restrained knee braces using round steel core bar dampers
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DOI：
10.1016/j.engstruct.2021.113431
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发表时间：
2022-01
影响因子：
5.5
通讯作者：
Togtokhbuyan Munkhunur;H. Tagawa;Xingchen Chen
中科院分区：
文献类型：
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作者：
Togtokhbuyan Munkhunur;H. Tagawa;Xingchen Chen
本文提出了一种在刚性节点梁端采用屈曲约束肘撑进行塑性扩散的新方法。提出了一种由钢芯杆和钢管屈曲约束器组成的细长支撑结构。采用钢筋的好处是，它可以缩小支撑和梁翼缘之间的肘撑连接。与砂浆填充的屈曲限制器相比，管屈曲限制器的优点包括相对简单的实施以便于构造和减轻的重量。进行了位移控制的循环加载试验，以检查使用建议的BRKBs刚性时刻连接的塑性行为的传播。结构性能指标，如滞回性能，在给定的负载下的强度能力，并在梁翼缘的应变分布进行了详细的测量和分析。此外，建议的BRKB的最佳参数确定通过广泛的数值研究。结果表明，所提出的细长BRKB的最佳参数显着提高承载能力，并减少在刚性梁柱连接附近的应力集中。因此，梁上的塑性区域在膝部支撑区域的内部和外部都扩展。根据迄今为止进行的研究，确定了所提出的BRKB是刚性梁柱连接中沿梁沿着传播塑性的可行选择。
This paper presents an innovative application of buckling-restrained knee braces (BRKBs) for spreading plasticity at the beam ends of rigid moment connections. A slender knee brace configuration consisting of a steel core bar and tube buckling restrainer is proposed. The benefit of adopting a steel bar is that it enables the downsizing of the knee brace connections between braces and beam flanges. The advantages of tube buckling restrainers include relatively simple implementation for ease of construction and reduced weight compared to mortar-filled buckling restrainers. Displacement-controlled cyclic loading tests were conducted to examine the spreading of the plasticity behaviors of rigid moment connections using the proposed BRKBs. Structural performance metrics such as hysteretic behavior, strength capacity under a given loading, and strain distributions at beam flanges were measured and analyzed in detail. Additionally, the optimal parameters for the proposed BRKBs were determined through an extensive numerical study. The results revealed that the optimal parameters of the proposed slender BRKBs significantly improve load-bearing capacity and reduce stress concentrations in the vicinity of the rigid beam-to-column connections. As a result, the plastic region on the beam is spread both inside and outside the knee brace area. Based on the research conducted thus far, it was determined that the proposed BRKB is a viable option for spreading plasticity along beams in rigid beam-to-column connections.