Resistance of longitudinally stiffened I-girders subjected to concentrated loads

Graciano, Carlos; Johansson, Bertil

doi:10.1016/s0143-974x(02)00046-9

Cited by 43 publications

(22 citation statements)

References 6 publications

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“…For the patch loading case, Graciano [4] demonstrated that the resistance to patch loading is also increased considerably with longitudinal stiffening, particularly when the stiffener is placed rather closed to the loaded flange. Interaction between patch loading and bending moments in longitudinally stiffened girder webs is often treated as for unstiffened webs [5]. In the last two decades, a number of experimental studies [6][7][8] have shown that longitudinal stiffening increases the ultimate resistance of plate girder webs to patch loading, in the presence of global bending (Fig.…”

Section: Introductionmentioning

confidence: 99%

Ultimate strength of longitudinally stiffened I-girder webs subjected to combined patch loading and bending

Graciano

Casanova

2005

Journal of Constructional Steel Research

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Section: Introductionmentioning

confidence: 99%

Ultimate strength of longitudinally stiffened I-girder webs subjected to combined patch loading and bending

Graciano

Casanova

2005

Journal of Constructional Steel Research

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“…Graciano and co-workers have already validated the finite element methodology presented herein with experimental results for patch loaded girders (Graciano et al 2014). In summary, shell elements are used to model the girder components, additionally initial shape imperfections are assumed to have sine curves in both along and across the web plate.…”

Section: Description and Calibration Of The Modelmentioning

confidence: 99%

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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“…Graciano and Lagerqvist [10] investigated critical patch loading capacity of longitudinally stiffened I-girders. Graciano and Johansson [11] developed a theoretical methodology for assessing the behavior of longitudinally stiffened I-girders subjected to patch loads. On the other hand, little work has been reported on the effects of eccentrically patch loading which is very common in engineering application such as crane girders loaded by crane wheels [1,9].…”

Section: Influence Of Eccentric Patch Loadingmentioning

confidence: 99%

“…By increasing web thickness of I-shape girders and using certain dimension based on results of researcher [7,8,10,11] for longitudinal stiffeners, weight of these sections have been equaled by each other. Then for different values of eccentricity, critical load of these sections has been achieved by analyzing the models.…”

Section: Comparison Of Girders Stiffeningmentioning

confidence: 99%

Strength of I-girders with Delta stiffeners subjected to eccentric patch loading

Arabzadeh

Varmazyari

2009

Journal of Constructional Steel Research

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Resistance of longitudinally stiffened I-girders subjected to concentrated loads

Cited by 43 publications

References 6 publications

Ultimate strength of longitudinally stiffened I-girder webs subjected to combined patch loading and bending

Ultimate strength of longitudinally stiffened I-girder webs subjected to combined patch loading and bending

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

Strength of I-girders with Delta stiffeners subjected to eccentric patch loading

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