Effect of Loading Frequency on Fatigue Life of Structural Steel and Welded Connection
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1.College of Civil Engineering, Tongji University, Shanghai 200092, China;2.Tongji Zhejiang College, Jiaxing 314051, China;3.China Railway Shanghai Design Institute Group Co., Ltd.,Shanghai 200070, China

Clc Number:

TU502+.6

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    Abstract:

    Is there any difference or what difference is in fatigue life between high-cycle fatigue tests of steel structures at the loading with low, medium, and high frequencies has always been a question for experimenters to find an answer to. Comparative analysis of fatigue test data (including tests conducted by the authors of the present paper and other scholars) was performed for structural steel as well as weldment at loadings between low frequency (below 30Hz) and medium-high frequency (around 100Hz). The effects of low and medium-high frequency loadings on fatigue life was investigated. The fatigue tests dealt with high strength steel Q460 and its butt-welded joints, as well as butt-welded joints of normal strength steel Q345. It was found that there was substantial difference in fatigue life between low and medium-high frequency loadings. The former had a longer fatigue life or higher fatigue strength than the latter, whether it was steel or butt-welded joints. The mechanism for this phenomenon was also explained. It is suggested that for engineering steel structures subjected to low frequency fatigue loadings, fatigue tests should be conducted using low frequency fatigue testing machine. It may significantly underestimate fatigue life if a fatigue testing machine with a frequency higher than low frequency is used.

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    Fig.1 Test specimen of Q460C steel at low and medium-high frequency fatigue loadings(unit: mm)
    Fig.2 Comparison of S-N curves of Q460C steel at low and medium-high frequency loadings
    Fig.3 Comparison of S-N curves of Q460D steel between Xi’an University of Technology and those of Tsinghua University
    Fig.4 Fatigue test specimen of Q460C butt-welded joint at low and medium-high frequency (Unit: mm)
    Fig.5 Comparison of S-N curves of Q345 butt-welded joint between the present paper and those of Chang’an University
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    Reference
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TONG Lewei, YUAN Yixin, NIU Lichao, YU Qitong, YAN Yang. Effect of Loading Frequency on Fatigue Life of Structural Steel and Welded Connection[J].同济大学学报(自然科学版),2021,49(1):1~7

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  • Received:August 23,2020
  • Online: February 26,2021
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