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

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.

• Autores: Graciano, Carlos; Zapata-Medina, David G.
• Tipo de recurso: Article of journal
• Fecha de publicación: 2015
• Institución: Universidad Nacional de Colombia
• Repositorio: Universidad Nacional de Colombia
• Idioma: spa
• OAI Identifier: oai:repositorio.unal.edu.co:unal/67681
• Acceso en línea: https://repositorio.unal.edu.co/handle/unal/67681; http://bdigital.unal.edu.co/68710/
• Palabra clave: 62 Ingeniería y operaciones afines / Engineering; patch loading; longitudinal stiffeners; ultimate strength; girders; bridge launching; finite element method; cargas concentradas; rigidizadores longitudinales; resistencia última; vigas; lanzamiento de puentes; método de los elementos finitos
• Rights: openAccess
• License: Atribución-NoComercial 4.0 Internacional