Incremental stiffening approach for CFS built-up-beams with large imperfections: Tests and flexural-behaviour
Incremental stiffening approach for CFS built-up-beams with large imperfections: Tests and flexural-behaviour
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具有大缺陷的 CFS 组合梁的增量加固方法：测试和弯曲行为
DOI：
10.1016/j.istruc.2023.05.003
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发表时间：
2023
期刊：
影响因子：
4.1
通讯作者：
Dar M
中科院分区：
文献类型：
--
作者：
Dar M
冷弯型钢（CFS）构件通常具有细长的横截面，使其更容易出现几何缺陷。不同的几何缺陷的存在，具有不同的幅度可以显着影响CFS成员的结构性能，这是在文献中有很好的报道。然而，有限的数据是可用于加固CFS梁与大的缺陷。本文报道了第一次试验研究的结果，重点是采用增量加劲法，以加强CFS组合梁与大的几何缺陷，由于不良的制造和随后的测试。CFS槽形截面被用于构造开口和闭合组合梁，在简支边界条件下在四点荷载下对其进行评估。逐步采用简单而有效的加强方法有助于在能力和刚度特性方面取得相当大的改进。将每个受试样本表现出的峰值载荷、弯曲刚度和失效模式用作关键性能指标。结果，在一般情况下，证实了采用增量加劲的可行性，以提高能力和刚度受损CFS组合梁分别高达145%和125%。此外，它表明，高达100%的屈服能力和高达80%的塑性能力，可以通过建议的加劲方法来实现。所提出的测试结果将补充目前不充分的数据库困扰CFS梁，并应证明是有用的，更有效的设计，这样的系统。
Cold-formed steel (CFS) members generally have slender cross-sections making them more prone to geometric imperfections. The presence of different geometric imperfections with varying magnitudes can significantly influence the structural behaviour of CFS members, which is well-reported in the literature. However, limited data is available on the strengthening of CFS beams with large imperfections. This paper reports the findings of the first experimental investigation that focuses on adopting incremental stiffening approach to strengthen CFS built-up beams with large geometric imperfections induced due to poor fabrication and subsequent testing. CFS channel sections were used to construct both open and closed built-up beams, which were evaluated under four-point loading with simply supported boundary conditions. The incremental adoption of simple, yet effective stiffening approaches helped in attaining considerable improvement in both capacity and stiffness characteristics. The peak load, flexural stiffness, and failure mode exhibited by each tested specimen were used as key performance indicators. The results, in general, confirmed the feasibility of adopting incremental stiffening for improving both the capacity and the stiffness in distressed CFS built-up beams by up to 145% and 125%, respectively. Also, it is shown that a yield capacity of up to 100% and a plastic capacity of up to 80% can be achieved through the proposed stiffening approach. The presented test results will supplement the current inadequate database on distressed CFS beams, and should prove useful for more efficient design of such systems.
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