Design equations for maximum stress concentration factors for concrete-filled steel tubular K-joints

IF 7.4 2区 工程技术 Q1 ENGINEERING, CIVIL Journal of Traffic and Transportation Engineering-English Edition Pub Date : 2024-10-01 DOI:10.1016/j.jtte.2022.07.007
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Abstract

Stress concentration factors (SCFs) for welded tubular joints can be decreased by filling the chord with concrete leading to a longer fatigue life. However, there are currently no design formula available in guidelines to predict the SCF of concrete-filled circular hollow section (CFCHS) K-joints, thus limiting their applicability in bridge design. To address this gap, finite element models for CFCHS K-joints were developed and compared against test results to ensure their accuracy. Then, a comprehensive parametric study was conducted to establish relationships between maximum SCFs and four variables: brace-to-chord diameter ratio (β), chord diameter-to-thickness ratio (2γ), brace-to-chord thickness ratio (τ), and the angle between braces and chord (θ). A total of 480 FE models were examined under three loading conditions including brace and chord loading: balanced axial force, chord axial force, and chord bending. Design equations to predict the maximum SCF for CFCHS K-joints were established by multiple regression analyses of the numerical results. A comparison of maximum SCFs between circular hollow section (CHS) and CFCHS K-joints was made, and it was concluded that average reductions of 42% and 33% in maximum SCFs in CFCHS K-joints at the locations of the chord and brace were found compared to CHS joints for balanced axial force, respectively. Finally, a case study illustrating how to use the proposed equations for fatigue safety verification was presented.
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混凝土填充钢管 K 型接头最大应力集中系数的设计方程
通过在弦部填充混凝土可以降低焊接管状接头的应力集中系数(SCF),从而延长疲劳寿命。然而,目前还没有任何设计公式可用于预测混凝土填充圆形空心截面(CFCHS)K 型接头的应力集中系数,因此限制了其在桥梁设计中的应用。为了填补这一空白,我们开发了 CFCHS K 型连接件的有限元模型,并将其与测试结果进行比较,以确保其准确性。然后,进行了全面的参数研究,以确定最大 SCF 与四个变量之间的关系:支撑与弦直径比 (β)、弦直径与厚度比 (2γ)、支撑与弦厚度比 (τ),以及支撑与弦之间的角度 (θ)。共有 480 个有限元模型在三种加载条件下进行了检验,包括支架和弦杆加载:平衡轴向力、弦杆轴向力和弦杆弯曲。通过对数值结果进行多元回归分析,建立了预测 CFCHS K 型关节最大 SCF 的设计方程。对圆形空心截面(CHS)和 CFCHS K 型接头的最大 SCF 进行了比较,得出的结论是,与 CHS 接头相比,CFCHS K 型接头在平衡轴向力下,弦杆和支撑位置的最大 SCF 平均分别降低了 42% 和 33%。最后,介绍了一个案例研究,说明如何使用所提出的公式进行疲劳安全验证。
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来源期刊
CiteScore
13.60
自引率
6.30%
发文量
402
审稿时长
15 weeks
期刊介绍: The Journal of Traffic and Transportation Engineering (English Edition) serves as a renowned academic platform facilitating the exchange and exploration of innovative ideas in the realm of transportation. Our journal aims to foster theoretical and experimental research in transportation and welcomes the submission of exceptional peer-reviewed papers on engineering, planning, management, and information technology. We are dedicated to expediting the peer review process and ensuring timely publication of top-notch research in this field.
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