Influence of the boundary conditions on FE-modeling of longitudinally stiffened I-girders subjected to concentrated loads/Influencia de las condiciones de borde en el modelado por elementos finitos de vigas rigidizadas longitudinalmente sometidas a cargas concentradas

• Published in: Revista Facultad de Ingeniería 2014-06 (71), p.221-221
• Main Authors: Graciano, Carlos A, Mendez, Jose, Medina, David G Zapata
• Format: Article
• Language: eng ; spa
• Subjects: Boundary conditions; Construction; Deformation effects; Girders; I beams; Iron; Mathematical analysis; Mathematical models
• ISSN: 0120-6230; 2422-2844

Longitudinally stiffened I-girders are commonly used to build incrementally launched steel bridges. During the bridge launching, the girders are subjected to concentrated loading at the support points. These loads are generally larger than those the structure would sustain once located in its final operating position. This paper is aimed at investigating the validity of this hypothesis for longer lengths of the applied load. The ultimate load of a stiffened girder is determined through finite element modeling, considering the boundaries conditions in two different ways, i.e., considering kinematic constraints and simulating a transverse stiffener. In addition, the used model considers the plastic behavior of the material, the existence of imperfections in the web of the girder and the effects of large deformations. The results show that for short length loadings both hypotheses yield similar results. However, as the loading length increases, significant differences in the results are observed.