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Experimental study on low cycle fatigue strength of beam-to-column connections in steel bridge bents with different plate assembling and material mismatching

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Abstract

This study examined the effects of inherent defects due to plate assembling and material mismatched condition between base and weld metal on the fatigue strength of beam-to-column connections. Low cycle fatigue tests were carried out on specimens with different plate assembling systems and material mismatched conditions. The test results revealed that the global load-displacement relationships from specimens with different plate assembling systems and material mismatched conditions are similar, meaning these effects involve only local behavior of specimens. However, the fatigue strength of the specimens strongly depends on the location of defects resulting from plate assembling and mismatched conditions. The specimen with the undermatched conditions and the existing defect located closer to the corner of beam-to-column connection tends to have lower fatigue strength. The fracture surfaces indicated that failure patterns of specimen are different regarding mismatched conditions. While the crack propagated through the weld metal for the undermatched condition, it propagated towards the boundary between base and weld metal for overmatched condition. Elasto-plastic shell analysis was performed under the same condition as the experiments. And it is found that when evaluating fatigue strength of beam-to-column connections, the effects of plate assembling system and material mismatched condition should be considered.

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Authors and Affiliations

  1. Department of Civil Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8552, Japan

    Kawin Saiprasertkit, Eiichi Sasaki & Chitoshi Miki

Authors
  1. Kawin Saiprasertkit
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  2. Eiichi Sasaki
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  3. Chitoshi Miki
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Correspondence to Kawin Saiprasertkit.

Additional information

Note.-Discussion open until February 1, 2013. This manuscript for this paper was submitted for review and possible publication on January 10, 2012; approved on July 27, 2012.

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Saiprasertkit, K., Sasaki, E. & Miki, C. Experimental study on low cycle fatigue strength of beam-to-column connections in steel bridge bents with different plate assembling and material mismatching. Int J Steel Struct 12, 351–362 (2012). https://doi.org/10.1007/s13296-012-3005-7

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