Effect of vertical flange stiffener on ductility of slotted web exclusive connection on (I)-shape profiles through experimental investigation

  • Mohamad Ghasem Vetr Department of International Institute of Earthquake Engineering and Seismology (IIEES), Iran.
  • farshad ghaffari M.SC.
Keywords: Ductility, lateral torsional buckling, seismic behavior, slotted web connection.


The separation of flange from beam web at slotted web connection improves many weaknesses of connection. Increasing ductility and elimination of the shear force present in beam flanges are benefits of this connection. In this article, the seismic behavior of this connection on IPE cross-sections is investigated with analytical methods and experimental testing, while considering effective factors in design. Using vertical flange stiffener on this connection is strongly impressive in improvement behavior of this connection. Considering design measures, results show no strength reduction in this part, compared to its non-slotted counterpart, and indicate lower strain gradient in beam flange welds. Performance comparisons on experimental study are made based on the total rotation, maximum resistance and energy dissipation of the specimens. Suitable ductility at this connection show that this connection stands in special moment connection class. More participation of panel zone in earthquake energy absorption reduces the total ductility of this connection and its maximum resistance.



Richard, R.M., Allen, C.J., and Partridge, C.E., (1997), “Proprietary Slotted Beam Conections Designs”, Journal of modern Steel Construction.

Richard, R.M., Allen, C.J., and Partridge, C.E., (1997), “Steel Frame Stress Reduction Connection”, United State Patent Application Publication.

Tawil, Sh.EL., Mikesell, T., Vidarsson, E., Kunnath, S. K., (April 1998), “Strength and Ductility of FR Welded-Bolted Connections”, SAC Steel Project. Report. SAC/BD98/01.

ICC Evaluation Service, INC, (2002), “Slotted Web Beam-To-Column Steel Moment Frame Connection”, Division: 05-Metals, Section: 05120-Structural Steel, Californa.

Federal Emergency Management Agency (FEMA), (2000), “Seismic Design Criteria for Steel Moment-Frame Structures”, FEMA 350 and 355D.

American Institute of Steel Construction, INC., (2010), “Seismic Provisions for Structural Steel Buildings”, AISC/ANSI 341-10 .

Richard, R.M., Allen, C.J., Partridge, C.E., (2001), “Accumulated Seismic Connection Damage Based upon Full Scale Low Cycle Fatigue Connection Tests”, Journal of SEAOC Conventions.

Mehrabian, A., Haldar, A., Moslehpour, S., (2006), “Nonlinear Analysis of Steel Frames with Ductile Connections”. IJME - INTERTECH Conference. Session ENG 204-08.

Department of Civil & Env. Engineering, Stanford University, (SAC), (2000), “Dvelopment of Loading Histories For aTesting of Steel Beam-to-Column assemblies”.

Lee, Ch.H., Jeon, S.W., Kim, J.H., Uang, Ch.M., (2004), “Seismic Performance of Reduced Section Steel Frame Connections: Effects of Panel Zone Strength and Beam Web Connection Method", 13th World Conference on Earthquake Engineering.

ANSYS, User’s Manual, (1992), Theory, Swanson Analysis Systems, Inc, Vol. IV.

Ricles, J.M., Mao, C., Lu, L.W., and Fisher, J.W. “Ductile Details for Welded Unreinforced

Moment Connections Subject to Inelastic Cyclic Loading” (2002), Engrg. Struct., 25,667-679.

Mechanical Engineering (1)