American Society of Civil Engineers


Inelastic Cyclic Testing of Welded Unreinforced Moment Connections


by James M. Ricles, M.ASCE, (Prof., Dept. of Civ. and Envir. Engrg., ATLSS Center Fac. Assoc., Lehigh Univ., 117 ATLSS Dr., Bethlehem, PA 18015. E-mail: jmr5@lehigh.edu), Changshi Mao, (Grad. Res. Asst., ATLSS Center, Lehigh Univ., 117 ATLSS Dr., Bethlehem, PA 18015), Le-Wu Lu, M.ASCE, (Prof., Dept. of Civ. and Envir. Engrg., ATLSS Center Fac. Assoc., Lehigh Univ., 117 ATLSS Dr., Bethlehem, PA 18015), and John W. Fisher, Hon.M.ASCE, (Prof., Dept. of Civ. and Envir. Engrg., ATLSS Center Fac. Assoc., Lehigh Univ., 117 ATLSS Dr., Bethlehem, PA 18015)

Journal of Structural Engineering, Vol. 128, No. 4, April 2002, pp. 429-440, (doi:  http://dx.doi.org/10.1061/(ASCE)0733-9445(2002)128:4(429))

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Document type: Journal Paper
Abstract: The results of an experimental study of the seismic performance of improved, welded unreinforced beam-to-column moment connections are presented. The study involved the inelastic cyclic testing of 11 full-scale connection specimens to evaluate the effects of weld access hole geometry, beam web attachment detail, panel zone strength, continuity plates, and composite slab on connection performance. With a high toughness weld metal and modified detailing, it is demonstrated that a welded unreinforced flange moment connection can reliably achieve an inealstic rotation of 0.03 rad or more prior to failure. The modified details include the use of a weld access hole with a modified geometry and a welded beam web. The test results indicate that a strong panel zone enhances inelastic connection performance. Based on the results of the study recommendations are given for the seismic-resistant design of improved welded unreinforced connections for steel moment-resisting frames.


ASCE Subject Headings:
Beams
Cyclic tests
Ductility
Inelasticity
Plates
Welded connections