Abstract
A comprehensive research program on large-size, welded moment connections conducted after the 1994 Northridge earthquake in California has identified three critical issues that could significantly affect the strength and ductility of the connections. They are: fracture toughness of weld metal, geometry and size of weld access hole, and control of panel zone deformation. Experimental and analytical studies on each of the issues have been performed at the Center for Advanced Technology for Large Structural Systems at Lehigh University. This paper presents brief descriptions of the studies, key results obtained and recommendations made to insure ductile performance of the connections.
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