Steel and Composite Structures

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A study on behavior of steel joints that combine high-strength bolts and fillet welds

  • Chang, Heui-Yung (Department of Civil and Environmental Engineering, National University of Kaohsiung) ;
  • Yeh, Ching-Yu (Department of Civil Engineering, National Cheng Kung University)
  • Received : 2018.11.09
  • Accepted : 2019.03.31
  • Published : 2019.05.25
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Abstract

In recent years, considerable attention has been paid to the research and development of high-strength steel plates, with particular emphasis on the enhancement of the seismic resistance of buildings and bridges. Many efforts have also been undertaken to improve the properties of high-strength bolts and weld materials. However, there are still different opinions on steel joints that combine high-strength bolts and fillet welds. Therefore, it is necessary to verify the design specifications and guidelines, especially for newly developed 1,400-MPa high-strength bolts, 570-MPa steel plates, and weld materials. This paper presents the results of literature reviews and experimental investigations. Test parameters include bolt strengths, weld orientations, and their combinations. The results show that advances in steel materials have increased the plastic deformation capacities of steel welds. That allows combination joints to gain their maximum strength before the welds have fracture failures. When in combination with longitudinal welds, high-strength bolts slip, come in contact with cover plates, and develop greater bearing strength before the joints reach their maximum strength. However, in the case of combinations with transverse welds, changes in crack angles cause the welds to provide additional strength. The combination joints can therefore develop strength greater than estimated by adding the strength of bolted joints in proportion to those of welded joints. Consequently, using the slip resistance as the available strength of high-strength bolts is recommended. That ensures a margin of safety in the strength design of combination joints.

Keywords

Acknowledgement

Supported by : National Center for Research on Earthquake Engineering (NCREE) in Taiwan, Ministry of Science and Technology (MOST) in Taiwan

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Cited by

  1. Effect of welding defects on mechanical properties of welded joints subjected to temperature vol.40, pp.2, 2019, https://doi.org/10.12989/scs.2021.40.2.193