Steel Latticed Members under Cyclic Axial and Flexural Actions
Publication: Journal of Structural Engineering
Volume 125, Issue 4
Abstract
To evaluate the cyclic behavior of a type of as-built steel latticed member for the seismic retrofit of the San Francisco–Oakland Bay Bridge, cyclic testing of three half-scale specimens was conducted. For eccentrically loaded specimens, local buckling in the end panel caused significant degradation in compressive strength; net section fracture of flange angles near rivet holes where lacing bars were connected was also observed. Bifurcation type global buckling was observed for the concentrically loaded specimen, causing a drastic drop in compressive strength. The buckling strength can be reliably predicted when the shearing effect and the appropriate effective length were considered. All three specimens were able to reach and exceed the strength predicted by the Load and Resistance Factor Design interaction formulas by about 6%, but this overstrength was slightly lower than that typically found in wide-flange beam-columns. Based on the test results, a modified axial force-moment interaction relationship was established. The ductility capacity ranged from 2.0 to 2.4.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 125 • Issue 4 • April 1999
Pages: 393 - 400
History
Received: Aug 26, 1998
Published online: Apr 1, 1999
Published in print: Apr 1999
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