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Eccentrically braced frame links with reduced web sections
AbstractLink-to-column connections in eccentrically braced frames (EBFs) must transmit large moments and shear forces to facilitate link rotation. Experiments have shown that welded link-to-column connections tend to fracture in the link flange prior to large link rotations. The American Institute of Steel Construction (AISC) seismic provisions warn designers of the problems with link-to-column connections and indicate they are the subject of ongoing research. AISC sponsored this pilot study to investigate the effectiveness of removing portions of the EBF link web in an attempt to limit forces that could develop in the flanges and thereby increase connection rotation capacity. Finite element models of nineteen shear yielding links were analyzed under cyclic loading. Modeling techniques were validated using data from previous experiments. Putting holes in the link web reduced stress and strain values in the link flanges at the connection, but increased the plastic strain and stress triaxiality in the web at the edges of holes. Links with reduced web sections are expected to have rotation capacities similar to, or less than, links with no web reductions that fail in the flanges. This study indicates that reduced web sections are not a promising solution to the problem.
Eccentrically braced frame links with reduced web sections
AbstractLink-to-column connections in eccentrically braced frames (EBFs) must transmit large moments and shear forces to facilitate link rotation. Experiments have shown that welded link-to-column connections tend to fracture in the link flange prior to large link rotations. The American Institute of Steel Construction (AISC) seismic provisions warn designers of the problems with link-to-column connections and indicate they are the subject of ongoing research. AISC sponsored this pilot study to investigate the effectiveness of removing portions of the EBF link web in an attempt to limit forces that could develop in the flanges and thereby increase connection rotation capacity. Finite element models of nineteen shear yielding links were analyzed under cyclic loading. Modeling techniques were validated using data from previous experiments. Putting holes in the link web reduced stress and strain values in the link flanges at the connection, but increased the plastic strain and stress triaxiality in the web at the edges of holes. Links with reduced web sections are expected to have rotation capacities similar to, or less than, links with no web reductions that fail in the flanges. This study indicates that reduced web sections are not a promising solution to the problem.
Eccentrically braced frame links with reduced web sections
Prinz, G.S. (author) / Richards, P.W. (author)
Journal of Constructional Steel Research ; 65 ; 1971-1978
2009-04-08
8 pages
Article (Journal)
Electronic Resource
English
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