Resistance of bridge girder webs subjected to concentrated forces

Lagerqvist, Ove

doi:10.1016/s0143-974x(98)00091-1

Cited by 11 publications

(21 citation statements)

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“…The model presented by Graciano (2001) proposes that the ultimate load for the unstiffened web is calculated according to the model developed by Lagerqvist (1995). Results show a good correlation with the full range of experimental results used in the regression analysis.…”

Section: Introductionmentioning

confidence: 90%

“…Implementation of nonlinear finite element analysis has been proven to be a rational tool to study the behavior of plate girders subjected to concentrated loads (Lagerqvist 1995, Granath 1998, Tryland et al 2001, Graciano and Edlund 2002, Graciano and Casanova 2005, Graciano et al 2011, Graciano and Ayestarán 2013 …”

Section: Numerical Analysis Generalmentioning

confidence: 99%

“…This problem has caught the attention of bridge engineering practitioners. Lagerqvist (1995) developed a design procedure based on a strength curve approach to determine the resistance to patch loading of unstiffened girders webs. Later on, Graciano (2002) proposed a methodology for the patch loading resistance of longitudinally stiffened girder webs.…”

Section: Introduction 123mentioning

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: Introductionmentioning

confidence: 90%

Section: Numerical Analysis Generalmentioning

confidence: 99%

Section: Introduction 123mentioning

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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“…Lagerqvist [6] realiza estudios en vigas de acero de alta resistencia sometidas a carga concentrada y carga aplicada en el extremo sin rigidizar longitudinalmente (Figura 2). Finalmente propone un modelo para determinar la resistencia última de la viga que incluye tres partes: resistencia a fluencia del material, carga elástica de pandeo y una función de resistencia.…”

Section: Antecedentesunclassified

Resistencia de vigas esbeltas de acero inoxidable bajo cargas concentradas mediante elementos finitos

Ayestarán

Ingeniería

Graciano

et al. 2017

revuin

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Este artículo puede compartirse bajo la licencia CC BY-ND 4.0 y se referencia usando el siguiente formato: A. Asdrúbal, C. Graciano, O.A. González-Estrada, "Resistencia de vigas esbeltas de acero inoxidable bajo cargas concentradas mediante elementos finitos", UIS Ingenierías, vol. RESUMENEl uso de acero inoxidable en estructuras ha cobrado fuerza en los últimos años debido a su gran relación costobeneficio en el tiempo, brindando una gran protección a la corrosión, resistencia al fuego y una resistencia a la fluencia mayor que la brindada por los aceros estructurales de uso común en la industria. A pesar de este incremento en su uso todavía existe cierto grado de incertidumbre y desconocimiento de sus aplicaciones, pues los códigos de diseño de acero enfocan su atención principalmente en el acero estructural. Por lo tanto, en el presente trabajo se reportan los resultados de un estudio numérico de vigas esbeltas de acero inoxidable utilizado en puentes, sometidos a carga concentrada con el objeto de aumentar el estado del arte de esta aplicación en particular. En este trabajo, se elabora un modelo no lineal por elementos finitos tomando en cuenta el comportamiento no lineal del material y las imperfecciones geométricas iniciales. El modelo es validado utilizando datos experimentales encontrados en la literatura. Posteriormente se realizó un estudio paramétrico sobre la influencia de la relación de espesores (tf /tw) y relación de zona de carga -largo de viga (Ss /a) en la resistencia última. Finalmente, se obtiene que el uso del acero inoxidable presenta ventajas en su comportamiento post-crítico respecto a paneles geométricamente similares de acero estructural, permitiendo la optimización estructural de vigas esbeltas para puentes. PALABRAS CLAVE:Vigas esbeltas, Carga concentrada, Acero inoxidable, Resistencia última. ABSTRACTThe use of stainless steel in structures has gained momentum in recent years due to its good cost-benefit over time, protection to corrosion, fire resistance and creep resistance greater than that provided by structural steel commonly used in industry. Despite this increase in use there is still some degree of uncertainty and lack of knowledge regarding their application, as steel design codes focus mainly on structural steel. Therefore, the present work reports the results of the numerical study of thin stainless steel beams used in bridges, subjected to concentrated loads, in order to increase the state-of-the art of this particular application. A finite element model is constructed herein taking into account the non-linear behavior of the material and the initial geometric imperfections. This model is validated using experimental data found in the literature. Then, a parametric study on the influence of the thickness ratio (tf /tw) and load arealength of beam ratio (Ss /a) on the ultimate strength is performed. Finally, it is obtained that the use of the stainless steel presents advantages in its post-critical behavior with respect to geometrically similar panels of structural steel, ...

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“…4-3a). In another study (Lagerqvist 1995, Johansson andLagerqvist 1995), a series of experimental investigations were conducted on simplysupported high strength steel plate girders under lateral patch loading. Among all specimens, a girder with geometrical configurations illustrated in Fig.…”

Section: Phase I: Intact Element-level Validationmentioning

confidence: 99%

Performance Evaluation of Damage-Integrated Composite Steel Girder Highway Bridges

Gheitasi

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AcknowledgementFirst and foremost, I would like to express my most sincere thanks and appreciation to Dr. Devin K. Harris for his years of advice on this dissertation and his continuous support during my time at Michigan Tech. and University of Virginia. More than all the scientific knowledge and experience with regards to my research, you have helped me tremendously with the career pursuit and at the same time allowed me to flourish on my own. All the classroom experiences I have gained during these four years would have not been possible without your trust and help. I will be forever grateful for your guidance and wisdom, which I believe will continue to prove invaluable to me throughout my future career.My dissertation committee, Dr. Theresa M. Ahlborn, Dr. Thomas T. Baber, Dr. Osman E.Ozbulut, and Dr. John R. Scully, your guidance, assistant, and time are much appreciated. Your experience and insight have given me the opportunity to visualize concepts from different perspectives which I believe helped me significantly to improve the research work done.I would also like to express my appreciation to my research sponsor; Mid-Atlantic Universities Transportation Centers (MAUTC) for providing support and interest for this project. I am also thankful to the Department of Civil and Environmental Engineering at theUniversity of Virginia for their financial support that enabled me to attend several national conferences and annual meetings during my PhD, and for the unique opportunity to teach my own class on "Bridge Engineering and Design". I would also like to thank Dr. Brown, Dr. Chase, Dr. Kassner for providing structural details and plans of the selected in-service structures within the Commonwealth of Virginia; and Mr.Prasad Nallapaneni from Virginia Department of Transportation (VDOT) for his help on providing details on the selected damage scenarios. AbstractThe safety and condition of transportation infrastructure has been at the forefront of national debates in recent times due to the catastrophic bridge failures occurred in the United States, but the issue has been a longstanding challenge for transportation agencies for many years as resources continue to diminish. The performance of this infrastructure has a direct influence on the lives of most of citizens in developed regions by providing a critical lifeline between communities and the transportation of goods and services, and as a critical component of the transportation network, bridges have received a lot of attention regarding condition assessment and maintenance practices. To date, several inspection methods and monitoring techniques have been developed and used by the bridge owners to monitor the in-service behavior and detect different sourced of damage and deterioration in bridge structures. Despite successful implementation of these methods, what is still lacking is a fundamental understanding of the system behavior in the presence of deteriorating conditions that can be used to estimate the remaining service life of the structure and facilit...

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Resistance of bridge girder webs subjected to concentrated forces

Cited by 11 publications

References 0 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

Resistencia de vigas esbeltas de acero inoxidable bajo cargas concentradas mediante elementos finitos

Performance Evaluation of Damage-Integrated Composite Steel Girder Highway Bridges

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