A contribution to the analysis of the behaviour of plate girders subjected to patch loading

Marković, Nenad M.; Hajdin, Nikola

doi:10.1016/0143-974x(92)90025-a

Cited by 40 publications

(23 citation statements)

References 2 publications

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“…As expected, the formulas developed by Bergfelt (1979), Kutmanova and Skaloud (1992), and Markovic and Hajdin (1992) show good correlation with their own experimental results. However, they fail to capture the full range of experimental data available in the literature (Graciano 2002).…”

Section: Introductionsupporting

confidence: 64%

“…Laboratory tests have shown that longitudinal wed stiffening enhances the ultimate resistance of plate girders under patch loading (Bergfelt 1979, Galea et al 1987, Shimizu et al 1987, Janus et al 1988, Dubas and Tschamper 1990, Markovic and Hajdin 1992, Carretero and Lebet 1998, Walbridge and Lebet 2001, Graciano and Casanova 2005, Pavlovcic et al 2007, among others). The experimental results show an increase between 5% and 60% in ultimate loads due to the inclusion of a longitudinal stiffener.…”

Section: Introductionmentioning

confidence: 99%

“…Markovic and Hajdin (1992) proposed a linear equation for the consideration of a longitudinal stiffener based on the statistical analysis of 133 experimental tests carried out previously by different authors.…”

Section: Introductionmentioning

confidence: 99%

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Effect of longitudinal stiffening on bridge girder webs at incremental launching stage

Graciano¹,

Zapata-Medina²

2015

ing.inv.

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Patch loading is a predominant load case at incremental bridge launching. Bridge girder webs are frequently provided with longitudinal stiffeners to increase in-service shear and bending strength, and its effect has been included in design codes. However, no straightforward rules are given to account for the influence of such stiffeners on improving the patch loading resistance. This paper presents a review of some available formulae found in the literature to estimate the girder ultimate strength including the provisions of the European, American and Colombian design codes. Additionally, a nonlinear finite element analysis is conducted on three case studies related to actual launched bridges. The case studies are also used to study the influence of the longitudinal stiffener and girder depth on the girder capacity. Different load-displacement responses are observed depending on the girder depth. Finally, the finite element analysis shows to what extent the longitudinal stiffeners can increase the patch loading capacity of bridge girder webs during launching.Keywords: Patch loading, longitudinal stiffeners, ultimate strength, girders, bridge launching, finite element method. RESUMENCargas concentradas son normalmente la condición de carga predominante durante el lanzamiento de puentes por empujes sucesivos, por lo cual, las almas de las vigas del puente son frecuentemente rigidizadas con placas longitudinales para incrementar la resistencia de servicio a cortante y flexión. Este efecto benéfico del rigidizador longitudinal es tomado en cuenta por varios códigos de diseño. Sin embargo, no hay normas claras que indiquen como tener en cuenta la influencia de tales rigidizadores en el incremento de la resistencia bajo cargas concentradas. Este artículo, presenta una revisión de algunas de las formulaciones disponibles en la literatura técnica para el cálculo de cargas últimas de pandeo en vigas bajo cargas concentradas incluyendo los lineamientos de los códigos de diseño Europeo, Americano y Colombiano. Adicionalmente, se presenta un análisis no lineal por elementos finitos de tres casos de estudio concernientes con el lanzamiento de puentes. Los casos de estudio son también utilizados para estudiar la influencia del rigidizador y de la profundidad de la viga en la carga última. Se observaron diferentes respuestas carga-deformación dependiendo de la profundidad de la viga y se muestra hasta qué punto los rigidizadores longitudinales pueden incrementar la capacidad de carga de vigas de puente durante su lanzamiento.Palabras clave: cargas concentradas, rigidizadores longitudinales, resistencia última, vigas, lanzamiento de puentes, método de los elementos finitos.

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Section: Introductionsupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

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Effect of longitudinal stiffening on bridge girder webs at incremental launching stage

Graciano¹,

Zapata-Medina²

2015

ing.inv.

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“…Markovic et al [15] suggest that the mean value for the ratio of predicted to experimental capacity should be 0.72. This means that, instead of using a coefficient of 0.55 in equation (1), a new value of 0.76 could be used.…”

Section: Compression Zonementioning

confidence: 99%

“…From the early stages of this investigation it was realised that the ultimate load capacity of the column web was determined essentially by the strength characteristics of the specimen. Literature searches for empirical formulas for calculating the ultimate load capacity of column webs at ambient temperature were unsuccessful, as these did not include the effects of the stiffness of the column flanges, but studies of plate girders subjected to patch loading [15] proved useful. One formula by Drdacky [16], for rather thick plate girder webs, had given good correlation with ambient-temperature tests [15].…”

Section: Compression Zonementioning

confidence: 99%

Experimental and analytical studies of steel joint components at elevated temperatures

et al. 2004

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This paper reports on experimental furnace testing and development of simple analytical models intended to initiate the development of a Component Method for modelling of steel beam-to-column connections in fire conditions. The basic theme of the Component Method is to consider any joint as an assembly of individual simple components. Each of these components is simply a non-linear spring, possessing its own level of strength and stiffness in tension, compression or shear, and these will degrade as its temperature rises.The main objective of this study was to investigate experimentally and analytically the behaviour of tension and compression zones of end-plate connections at elevated temperatures. A series of experiments has been carried out, and these are described in the paper. Simplified analytical models of the component behaviour have been developed, and these have been validated against the tests and against detailed finite element simulations. The simplified models have been shown to be very reliable for this very common type of joint, although similar equations will need to be developed for other configurations. The component models developed have been shown to produce moment-rotation curves which correlate well with the results of previous furnace tests on complete connection behaviour in fire. The principles of the Component Method can be used directly in either simplified or finite element modelling, without attempting to predict of the overall joint behaviour in fire. This will enable semi-rigid behaviour to be taken into account in the analytical fire engineering design of steel-framed buildings, for which it is inadequate simply to consider the degradation of the ambient-temperature moment-rotation characteristics of a joint without taking account of the high axial forces which also occur.

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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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A contribution to the analysis of the behaviour of plate girders subjected to patch loading

Cited by 40 publications

References 2 publications

Effect of longitudinal stiffening on bridge girder webs at incremental launching stage

Effect of longitudinal stiffening on bridge girder webs at incremental launching stage

Experimental and analytical studies of steel joint components at elevated temperatures

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

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