TY - JOUR
T1 - Effectiveness of stiffeners on steel plate shear buckling at ambient and elevated temperatures
AU - Glassman, Jonathan D.
AU - Boyce, Veronica
AU - Garlock, Maria E.Moreyra
N1 - Funding Information:
This research was made with Government support under and awarded by DoD , Air Force Office of Scientific Research , National Defense Science and Engineering Graduate (NDSEG) Fellowship , 32 CFR 168a, provided to Dr. Glassman. This research was also sponsored by the National Science Foundation (NSF) under grant CMMI-1068252 . All opinions, findings, and conclusions expressed in this paper are of the authors and do not necessarily reflect the policies and views of the sponsors.
Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2019/2/15
Y1 - 2019/2/15
N2 - There are a growing number of bridge fire events and the National Fire Protection Association (NFPA) requires that critical structural elements of the bridge be protected from elevated temperatures due to fire. However, no guidance is given on how to protect these critical elements, nor how to identify them. Further, slender steel web plates have been shown to be vulnerable to shear buckling in fire events and recent research that indicates that the load path of shear forces in thin web plates is not well understood. The overall objective of this paper is to examine the effectiveness of stiffeners for enhancing the shear capacity of slender plates at ambient and elevated temperatures. Specifically, evaluations are made regarding the effectiveness of stiffeners for increasing the shear buckling capacity through various stiffener orientations, providing lateral restraint, and providing a load path for shear forces. In particular, the elastic shear buckling load, Vcr, and the ultimate shear postbuckling load, Vu, of the steel plate are examined. Finite element analyses, which have been validated with experimental data, are used as a basis for the study. The temperatures studied range from ambient to 1100 °C. This study provides some important insights on the behavior of plates under shear loads. For example, results indicate that the stiffener's role is not that of a load path for the shear forces, but one of lateral restraint, regardless of its geometric orientation. Further, it is shown that for lower temperatures a stiffener oriented along the compression diagonal (opposite to a tension field) provides the most improvement in postbuckling strength.
AB - There are a growing number of bridge fire events and the National Fire Protection Association (NFPA) requires that critical structural elements of the bridge be protected from elevated temperatures due to fire. However, no guidance is given on how to protect these critical elements, nor how to identify them. Further, slender steel web plates have been shown to be vulnerable to shear buckling in fire events and recent research that indicates that the load path of shear forces in thin web plates is not well understood. The overall objective of this paper is to examine the effectiveness of stiffeners for enhancing the shear capacity of slender plates at ambient and elevated temperatures. Specifically, evaluations are made regarding the effectiveness of stiffeners for increasing the shear buckling capacity through various stiffener orientations, providing lateral restraint, and providing a load path for shear forces. In particular, the elastic shear buckling load, Vcr, and the ultimate shear postbuckling load, Vu, of the steel plate are examined. Finite element analyses, which have been validated with experimental data, are used as a basis for the study. The temperatures studied range from ambient to 1100 °C. This study provides some important insights on the behavior of plates under shear loads. For example, results indicate that the stiffener's role is not that of a load path for the shear forces, but one of lateral restraint, regardless of its geometric orientation. Further, it is shown that for lower temperatures a stiffener oriented along the compression diagonal (opposite to a tension field) provides the most improvement in postbuckling strength.
KW - Elevated temperature
KW - Plate girder
KW - Postbuckling
KW - Stiffener
KW - Web shear buckling
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U2 - 10.1016/j.engstruct.2018.12.012
DO - 10.1016/j.engstruct.2018.12.012
M3 - Article
AN - SCOPUS:85058943244
SN - 0141-0296
VL - 181
SP - 491
EP - 502
JO - Engineering Structures
JF - Engineering Structures
ER -