Steel and Composite Structures

  • 제51권5호
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  • Pages.563-573
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  • 2024
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  • 1229-9367(pISSN)
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  • 1598-6233(eISSN)
테크노프레스 (Techno-Press)
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Experimental investigation of local stress distribution along the cross-section of composite steel beams near joints

  • Sangwook Park (Department of Civil and Environmental Engineering, Oklahoma State University) ;
  • Patricia Clayton (Department of Engineering, Wake Forest University) ;
  • Todd A. Helwig (Department of Civil, Architectural and Environmental Engineering, University of Texas at Austin) ;
  • Michael D. Engelhardt (Department of Civil, Architectural and Environmental Engineering, University of Texas at Austin) ;
  • Eric B. Williamson (Department of Civil and Mechanical Engineering, U.S. Military Academy)
  • 투고 : 2023.09.06
  • 심사 : 2024.06.04
  • 발행 : 2024.06.10
⟨ 이전 논문 다음 논문 ⟩

초록

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, orshear 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.

키워드

과제정보

This research was supported by the National Science Foundation (NSF) under Award No. CMMI-1825691. The financial support is gratefully acknowledged. The full details and experimental results for this test program have been archived at the DesignSafe website (https://doi.org/10.17603/ds2-xa1b-ac84). The authors gratefully acknowledge the generous donation of structural steel from the American Institute of Steel Construction (AISC) and steel floor deck from New Millennium Building Systems. The authors also gratefully acknowledge the comments and feedback provided by an industry advisory group that included Tom Sputo, Larry Kruth, and Pat McManus. Any opinions, findings, and conclusions or recommendations expressed in this paper are those of the authors and do not necessarily reflect the views of the National Science Foundation or the individuals noted above.

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