Experimental investigation of local stress distribution along the cross-section of composite steel beams near joints
Sangwook Park,Patricia Clayton,Todd A. Helwig,Michael D. Engelhardt,Eric B. Williamson
Abstract
This research experimentally evaluated the local stress distribution along the cross-section of composite beams under both positive and negative moments. The experiment utilized a large-scale, two-story, two-by-three bay steel gravity frame with a concrete on metal deck floor system. The composite shear connections, which are nominally assumed to be pinned under gravity loading, can develop non-negligible moment-resisting capacity when subjected to lateral loads. This paper discusses the local stress distribution, or shear lag effects, observed near the beam-to-column connections when subjected to combined gravity and lateral loading. Strain gauges were used for measurements along the beam depth at varying distances from the connection. The experimental data showed amplified shear lag effects near the unconnected region of the beam web and bottom flange under the applied loading conditions. These results indicate that strain does not vary linearly across the beam cross-section adjacent to the connection components. This insight has implications for the use of experimental strain gauge data in estimating beam demands near the connections. These findings can be beneficial in informing instrumentation plans for future experimental studies on composite beams.
Sangwook Park — Department of Civil and Environmental Engineering, Oklahoma State University, Stillwater, OK 74074, USA
Patricia Clayton — Department of Engineering, Wake Forest University, Winston-Salem, NC 27109, USA
Todd A. Helwig and Michael D. Engelhardt — Department of Civil, Architectural and Environmental Engineering, University of Texas at Austin, Austin, TX 78758, USA
Eric B. Williamson — Department of Civil and Mechanical Engineering, U.S. Military Academy, West Point, NY 10996, USA
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