Influence of patch load length on plate girders. Part II: Numerical research

Kovacevic, Sasa; Marković, Nenad M.; Sumarac, Dragoslav; Salatić, Ratko

doi:10.1016/j.jcsr.2019.03.025

Cited by 19 publications

(17 citation statements)

References 21 publications

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“…Additionally, we can also summarize our findings regarding the influence of the web panel aspect ratio (a / hw). A direct comparison between the current study and studies in [13][14]16] reveals that increasing the web panel aspect ratio decreased the patch load resistance of longitudinally unstiffened girders for all the considered initial geometrical imperfections and patch load lengths ss / hw ≤ 0.50. This is especially pronounced for greater patch load lengths (i.e., ss / hw = 0.50) and the decrease can be between 15-46%.…”

Section: Resultssupporting

confidence: 50%

“…In this case, the strengthening effect is negligible for ss / hw ≤ 0.15, while it is significantly pronounced for longer patch load lengths, ss / hw = 0.50. However, in [13][14]16], we showed that for this initial geometrical imperfection (combination of buckling modes) and patch load lengths ss / hw ≤ 0.25, the ultimate strengths of longitudinally stiffened girders were lower than for unstiffened girders. For the considered case in [13][14]16], the second as well as third buckling mode (for ss / hw ≤ 0.05 and ss / hw ≤ 0.20, respectively) returned smaller patch load resistances of longitudinally stiffened than for unstiffened girders.…”

Section: Resultsmentioning

confidence: 99%

“…This change in buckling pattern for the third buckling mode of longitudinally stiffened plate girders is directly influenced by the web panel aspect ratio. For the considered girder geometry in the cur-rent paper, the transition patch load length that changed the buckling pattern of the third buckling mode for longitudinally stiffened girders was for patch load lengths ss / hw > 0.25, while for a smaller web panel aspect ratio [13][14]16] this happened for ss / hw > 0.40. Therefore, the lowest patch load resistance of longitudinally stiffened girders for all the considered geometrical imperfections (Fig.…”

Section: Unfavorable Initial Geometrical Imperfectionmentioning

confidence: 99%

“…Figure 1 Typical failure modes for longitudinally unstiffened and stiffened steel plate girders subjected to patch loading. Source: The authors Additionally, we showed that initial geometrical web panel imperfections can play a decisive role since they affect the ultimate strength and behavior of steel plate girders, especially for longitudinally stiffened girders [13][14]16]. In these studies, different shapes of initial geometrical web panel imperfections were considered along with different patch load length.…”

Section: Introductionmentioning

confidence: 99%

“…Figure13 Third buckling mode for longitudinally stiffened for ss / hw ≤ 0.25 (left) and for ss / hw > 0.25 (right). Source: The authors…”

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confidence: 99%

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Patch load resistance of longitudinally stiffened steel plate girders: A parametric study

Kovacevic¹,

Ceranic²,

Marković³

2021

ce papers

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In this paper, an in‐depth nonlinear finite element analysis is carried out on longitudinally unstiffened and stiffened welded I‐steel plate girders subjected to patch loading. The most realistic load case is during the incremental launching of multi‐span steel and composite bridges over temporary or permanent supports. Bridge plate girders are usually reinforced by longitudinal and transverse stiffeners in order to prevent web panel buckling and to increase the bending and shear strength. The current European design standard EN 1993‐1‐5 also requires a stability control check for concentrated transverse forces (patch loading) since it can be a decisive design criterion. By using longitudinal stiffeners for flexural and shear resistance, the patch loading carrying capacity can be increased as well. Previous experimental studies showed that the EN1993‐1‐5 patch loading resistance model significantly underestimates the ultimate strength of longitudinally stiffened plate girders. The paper is primarily dealing with numerical research of the post‐buckling behavior and ultimate strength of longitudinally stiffened I‐steel plate girders reinforced by one longitudinal stiffener. The main objective of the present work is to investigate the influence of different geometrical parameters, including patch load length, web panel aspect ratio, and initial geometrical imperfections, on the ultimate strength of longitudinally stiffened plate girders. We showed in this study that for all the considered initial geometrical imperfections, the patch load resistance increases as the patch load length is increased. The lowest ultimate strength of longitudinally stiffened plate girders was determined for initial geometrical imperfections that resembled the deformed shape at collapse (collapse‐affine imperfections). The web panel aspect ratio also influenced the patch load resistance and lower ultimate strengths were returned for bigger web panel aspect ratios. Finally, further research recommendations are presented.

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Section: Resultssupporting

confidence: 50%

Section: Resultsmentioning

confidence: 99%

Section: Unfavorable Initial Geometrical Imperfectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Figure13 Third buckling mode for longitudinally stiffened for ss / hw ≤ 0.25 (left) and for ss / hw > 0.25 (right). Source: The authors…”

mentioning

confidence: 99%