Experimental study on seismic performance of partial penetration welded steel beam-column connections with different fillet radii

  • Ge, Hanbin ;
  • Jia, Liang-Jiu ;
  • Kang, Lan ;
  • Suzuki, Toshimitsu
  • Received : 2014.06.11
  • Accepted : 2014.07.28
  • Published : 2014.12.25


Full penetration welded steel moment-resisting frame (SMRF) structures with welded box sections are widely employed in steel bridges, where a large number of steel bridges have been in operation for over fifty years in Japan. Welding defects such as incomplete penetration at the beam-column connections of these existing SMRF steel bridge piers were observed during inspection. Previous experiments conducted by the authors' team indicate that gusset stiffeners (termed fillets in this study) at the beam-web-to-column-web joint of the beam-column connections may play an important role on the seismic performance of the connections. This paper aims to experimentally study the effect of the fillet radius on seismic performance of the connections with large welding defects. Four specimens with different sizes of fillet radii were loaded under quasi-static incremental cyclic loading, where different load-displacement relations and cracking behaviors were observed. The experimental results show that, as the size of the fillet radius increases, the seismic performance of the connections can be greatly improved.


connection detail;welding defect;cyclic loading;beam-column connection;thick-walled steel member


  1. Bazzaz, M., Kheyroddin, A., Kafi, M.A. and Andalib, Z. (2012), "Evaluation of the seismic performance of off-centre bracing system with ductile element in steel frames", Steel Compos. Struct., Int. J., 12(5), 445-464.
  2. Bruneau, M., Wilson, J.C. and Tremblay, R. (1996), "Performance of steel bridges during the 1995 Hyogo-ken Nanbu (Kobe, Japan) earthquake", Can. J. Civ. Eng., 23(3), 678-713.
  3. Chen, S.J., Yang, K.C., Lin, K.M. and Wang, C.C. (2012), "Experimental studies of circular composite bridge piers for seismic loading", Steel Compos. Struct., 12(3), 261-273.
  4. Ge, H.B., Kawahito, M. and Ohashi, M. (2007a), "Experimental study on ductile crack initiation and its propagation in steel bridge piers of thick walled box sections", J. Struct. Eng. JSCE, 53A, 493-502. [In Japanese)
  5. Erfani, S., Naseri, A.B. and Akrami, V. (2012), "The beneficial effects of beam web opening in seismic behavior of steel moment frames", Steel Compos. Struct., Int. J., 13(1), 35-46.
  6. Ge, H.B. and Luo, X.Q. (2011), "A seismic performance evaluation method for steel structures against local buckling and extra-low cycle fatigue", J. Earthq. Tsunami, 5(1), 1-17.
  7. Ge, H.B. and Kang, L. (2012), "A damage index-based evaluation method for predicting the ductile crack initiation in steel structures", J. Earthq. Eng., 16(5), 623-643.
  8. Ge, H.B., Kawahito, M. and Ohashi, M. (2007b), "Ultimate strains of structural steels against ductile crack initiation", J. Struct. Mech. Earthq. Eng. JSCE, 24(1), 13s-22s. [In Japanese]
  9. Ge, H.B., Kang, L. and Tsumura, Y. (2013), "Extremely low-cycle fatigue tests of thick-walled steel bridge piers", J. Bridge Eng. ASCE, 18(9), 858-870.
  10. Hsu, H.L., Juang, J.L. and Chou, C.H. (2011), "Experimental evaluation on the seismic performance of steel knee braced frame structures with energy dissipation mechanism", Steel Compos. Struct., Int. J., 11(1), 77-91.
  11. Japan Society of Civil Engineers (JSCE) (2008), Standard Specifications for Steel and Composited Structures IV: Seismic Design, Japan Society of Civil Engineers, Tokyo, Japan. [In Japanese]
  12. Jia, L.J. and Kuwamura, H. (2013a), "Prediction of cyclic behaviors of mild steel at large plastic strain using coupon test results", J. Struct. Eng. ASCE, 140(2), 04013056. DOI: 10.1061/(ASCE)ST.1943-541X.0000848
  13. Jia, L.J. and Kuwamura, H. (2013b), "Ductile fracture simulation of structural steels under monotonic tension", J. Struct. Eng. ASCE, 140(5), 04013115. DOI: 10.1061/(ASCE)ST.1943-541X.0000944
  14. Jia, L.J., Ge, H.B. and Suzuki, T. (2014), "Effect of post weld treatment on cracking behaviors of beam-column connections in steel bridge piers", Steel Compos. Struct., Int. J., 17(5), 687-704.
  15. Kang, L. and Ge, H.B. (2013), "Predicting ductile crack initiation of steel bridge structures due to extremely low-cycle fatigue using local and non-local models", J. Earthq. Eng., 17(3), 323-349.
  16. Linzell, D.G. and Nadakuditi, V.P. (2011), "Parameters influencing seismic response of horizontally curved, steel, I-girder bridges", Steel Compos. Struct., Int. J., 11(1), 21-38.
  17. Luo, X.Q., Ge, H.B. and Ohashi, M. (2012), "Experimental study on ductile crack initiation in compact section steel columns", Steel Compos. Struct., Int. J., 13(4), 383-396.
  18. Ma, H., Jiang, W. and Cho, C. (2011), "Experimental study on two types of newbeam-to-column connections", Steel Compos. Struct., 11(4), 291-305.
  19. MacRae, G. and Kawashima, K. (2001), "Seismic behavior of hollow stiffened steel bridge columns", J. Bridge Eng. ASCE, 6(2), 110-119.
  20. Miki, C. and Sasaki, E. (2005), "Fracture in steel bridge piers due to earthquakes", Steel Struct., 5(2), 133-140.
  21. Morikawa, H., Shimozato, T., Miki, C. and Ichikawa, A. (2002), "Study on fatigue cracking in steel bridge piers with box section and temporally repairing", Proceedings of JSCE, 703(I-59), 177-183. [In Japanese]
  22. Soy, U. (2012), "Numerical modelling of stress and deflection behaviourfor welded steel beam-column", Steel Compos. Struct., Int. J., 12(3), 249-260.
  23. Usami, T. (2006), Guidelines for Seismic and Damage-Control Design of Steel Bridges, Gihodo-Shuppan, Tokyo, Japan. [In Japanese]
  24. Yamao, T., Iwatsubo, K., Yamamuro, T., Ogushi, M. and Matsumura, S. (2002), "Seismic behavior of hollow stiffened steel bridge columns", Thin-walled Struct., 40(2), 183-197.
  25. Zahrai, S.M. and Jalali, M. (2014), "Experimental and analytical investigations on seismic behavior of ductile steel knee braced frames", Steel Compos. Struct., Int. J., 16(1), 1-21.

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  1. Seismic Performance of Compact Beam–Column Connections with Welding Defects in Steel Bridge Piers vol.22, pp.4, 2017,


Supported by : JSPS