Stability of curved steel I-girder bridges during construction

T. Andres Sanchez, Donald W. White

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

12 Citas (Scopus)

Resumen

Structural stability is one of the essential aspects of the construction of curved steel I-girder bridges. The AASHTO load and resistance factor design (LRFD) bridge design specifications require the consideration of stability-critical conditions during the construction of curved I-girder bridges through checking (a) nominal initial yielding due to combined major-axis bending and flange lateral bending, (b) strength under combined major-axis and flange lateral bending, and (c) web-bend buckling. These specifications limit the flange lateral bending stress to 0.6Fy. In some cases, these rules may not be sufficient unless global second-order amplification of the lateral-torsional response is considered. In particular, structures with narrow widths and long spans may be susceptible to large second-order amplification that could compromise the overall system constructability. This paper presents analytical studies of a slender curved and skewed I-girder bridge unit that exhibited difficulties during the placement of the concrete deck. The results of approximate one-and two-dimensional analyses of the construction phase are compared with refined three-dimensional finite element solutions to highlight their differences. Guidelines are provided for handling cases in which the slender geometry of the structure may be an important constructability consideration.

Idioma originalInglés
Páginas (desde-hasta)122-129
Número de páginas8
PublicaciónTransportation Research Record
N.º2268
DOI
EstadoPublicada - 1 dic. 2012
Publicado de forma externa

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