管状腹板减小梁截面连接抗震性能的分析和数值研究

Ehsan Ekhveh, Rasoul Mirghaderi, Sina Kavei, Mehdi Ghassemieh, Farshid Rashidiyan
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引用次数: 0

摘要

钢结构中的缩减梁截面(RBS)连接被广泛应用,以获得足够的延展性,避免在抗弯框架中产生脆性破坏。与其他类型的连接相比,传统的 RBS 连接可能会降低弯矩承载能力,并导致结构产生较大的侧向变形。为了解决这一问题,近年来有人提出了新型的 RBS 连接形式,如管状腹板 RBS 连接,在以往的研究中,这种连接形式在各种荷载条件下都表现出了理想的性能。因此,本研究对这种连接在地震荷载下的性能进行了分析和数值研究。在这方面,第一步是引入与带有管状腹板的减小梁的结构特性和稳定性相关的分析方程。利用这些方程,提出了管状腹板 RBS 连接设计的综合程序。随后,创建了管状腹板 RBS 连接的数值模型,并使用 ABAQUS 软件中的有限元法对其进行了循环载荷分析。根据模拟结果,建议的连接符合有效的国际标准标准,可用于特殊的抗弯矩框架。为了评估在力矩抵抗框架中使用建议的连接所产生的影响,研究了使用该连接的两个二维力矩抵抗框架的性能。研究结果表明,使用管状腹板 RBS 连接时,相对位移的最大增加百分比为 1.68%,而使用传统 RBS 连接时,这一数字上升到 10.6%。因此,设计人员可以使用管状腹板 RBS 连接件代替传统的 RBS 连接件,以提高结构的横向稳定性,控制地震荷载引起的横向挠度,而无需增加框架构件的尺寸。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analytical and numerical investigation of the seismic behavior of tubular web reduced beam section connections
The reduced beam section (RBS) connections in steel structures are widely used to achieve sufficient ductility and avoid creating brittle failures in moment‐resisting frames. Compared to other types of connections, conventional RBS connections have the potential to reduce moment capacity and induce larger lateral deformation in the structure. In order to resolve this problem, novel forms of RBS connections have been proposed in recent years, such as tubular web RBS connections, which have shown a desirable performance under various loading conditions in previous studies. Therefore, this study conducted an analytic and numerical investigation of this connection under seismic loading. In this regard, the first step is to introduce the analytic equations related to the structural properties and stability of the reduced beam with the tubular web. Using these equations, a comprehensive procedure for the design of the tubular web RBS connections is presented. After that, a numerical model of the tubular web RBS connections is created and then analyzed under cyclic loading using the finite element method in ABAQUS software. Based on the results of this simulation, the suggested connection meets the criteria of valid international standards and can be used in the special moment‐resisting frame. In order to assess the impact of using the proposed connection in moment‐resisting frames, the performance of two 2D moment‐resisting frames with this connection is studied. This study shows that the maximum percentage increase in relative displacement caused by using tubular web RBS connections is 1.68%, whereas this figure rises to 10.6% when conventional RBS connections are used. Therefore, the designers can use tubular web RBS connections instead of conventional RBS connections to increase the lateral stability of the structure and control its lateral deflection due to the seismic loadings without having to increase the dimensions of the frame elements.
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