Fatigue Test Research on Improved T-Stub Specimen of Welded Beam-to-Column Connections

Abstract

The current T-stub specimen of welded beam-to-column connections in steel structures was improved by adding clamping ends at both sides for convenience of fatigue tests. Uniaxial fatigue tests of the T-stub specimens were conducted. The fatigue properties and failure characteristics of the T-stub specimens were summarized and compared with those of two other standard welded joint configurations. Based on finite element analysis, various fatigue assessment approaches were used to predict the fatigue life of the specimens and the assessment results were compared with the test results. Previously developed unified design curves suitable to high-cycle and low-cycle fatigue assessment of standard welded joint configurations were extended to welded joints in beam-to-column connections. The results show that accurate experimental results can be obtained using the improved T-stub specimens with clamping ends; Under cyclic loading, the welded joint in beam-to-column connections has satisfying energy dissipation capacity, but the fatigue strength is relatively poor; the unified design curves are well applicable to the fatigue life assessment and design of welded beam-to-column connections in steel structures.

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Acknowledgements

This research was supported by the National Natural Science Foundation of China (No. 52008202, No. 51978154 and No. 51438002), the Scientific Research Foundation of Nanjing Institute of Technology (YKJ201927), the Distinguished Young Scientists of Jiangsu Province (No. BK20190013) and the Natural Science Foundation of Jiangsu Province in China (No. BK20191016).

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Correspondence to Youliang Ding.

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Fang, Z., Li, A. & Ding, Y. Fatigue Test Research on Improved T-Stub Specimen of Welded Beam-to-Column Connections. J Fail. Anal. and Preven. (2021). https://doi.org/10.1007/s11668-021-01118-6

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Keywords

  • Improved T-stub specimen
  • Beam-to-column connection
  • Axial low-cycle fatigue test
  • Fatigue assessment