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Local Buckling Behavior of High Strength Steel Welded Circular Tubes Under Axial Compression

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Abstract

In this work, 120 finite element models (FEMs) of circular tube stub columns with four different yield strengths including 550 MPa (Q550), 690 MPa (Q690), 800 MPa (Q800) and 960 MPa (Q960) were established and validated with the existing experiment data to confirm the tube wall slender limit and evaluate the effect of the local buckling on the ultimate capacity. The effects of three main types of residual stresses were investigated, which can force ultimate capacity to decrease up to 7.1% and 8.0% for Q690 and Q960, respectively. The relationship between the ratio of diameter to thickness (D/t) and ultimate capacity was examined, which revealed that the ultimate capacity was obviously reduced resulting from increasing D/t; in addition, the effect gradually enhanced for higher steel grades, because of smaller tube wall slenderness limit meaning larger local buckling effect. New D/t limit 36, 28, 22 and 18 was proposed for Q550, Q690, Q800 and Q960 circular tubes, respectively. Compared with the FEM result and experiment data, the formula in the related codes provides conservative result; therefore, new theoretical formula for ultimate capacity assessment of high strength steel circular tubes based on the direct strength method and effective area method was put forward.

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Acknowledgment

This work is financially supported by the Natural Science Foundation of Jiangsu Province Grant No. BK20191013 and Scientific Research Foundation of Nanjing Institute of Technology under Grant No.YKJ201837. All sponsors are gratefully acknowledged. Any opinions, findings, conclusions and recommendations presented in this paper are from the writers and do not necessarily reflect the views of the sponsors.

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Authors and Affiliations

  1. Nanjing Institute of Technology, Nanjing, China

    Bin Huang

  2. China Shipbuilding NDRI Engineering Co., Ltd, Shanghai, China

    Zhou Che Hong

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  1. Bin Huang
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  2. Zhou Che Hong
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Correspondence to Bin Huang.

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Huang, B., Hong, Z.C. Local Buckling Behavior of High Strength Steel Welded Circular Tubes Under Axial Compression. J Fail. Anal. and Preven. 20, 1364–1375 (2020). https://doi.org/10.1007/s11668-020-00942-6

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  • DOI: https://doi.org/10.1007/s11668-020-00942-6

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