Timber Arch Bridges with V-shaped Hangers

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Timber Arch Bridges with V-shaped Hangers. / Crocetti, Roberto; Branco, Jorge M.; Barros, Jorge F.

In: Structural Engineering International, Vol. 29, No. 2, 2019, p. 261-267.

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Crocetti, Roberto ; Branco, Jorge M. ; Barros, Jorge F. / Timber Arch Bridges with V-shaped Hangers. In: Structural Engineering International. 2019 ; Vol. 29, No. 2. pp. 261-267.

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TY - JOUR

T1 - Timber Arch Bridges with V-shaped Hangers

AU - Crocetti, Roberto

AU - Branco, Jorge M.

AU - Barros, Jorge F.

PY - 2019

Y1 - 2019

N2 - The arch is a very efficient load bearing structure, especially when its shape is affine to the funicular of forces. However, if live loads are predominant as compared to permanent uniformly distributed gravity loads, the arch will be subjected to substantial bending moments, thus losing a great part of its structural efficiency. In traditional arch bridges with hangers arranged in a vertical manner, asymmetrical loads would cause a substantial deviation of the pressure line from the axial line of the arch. In this paper, an innovative concept for timber arch bridges is introduced where V-shaped hangers, rather than vertical hangers, are used. The adoption of V-shaped hangers significantly contributes to the reduction of the eccentricity between the pressure line and the axial line of the arch, thus decreasing the magnitude of bending moments in the arch. The paper discusses the advantages of using V-shaped hangers as an alternative to vertical hangers, both in terms of statics, in-plane stability and dynamic efficiency. Moreover, the design and the recent construction of a parabolic three-hinged arch made of timber, with a steel V-shaped hanger is thoroughly discussed in the paper.

AB - The arch is a very efficient load bearing structure, especially when its shape is affine to the funicular of forces. However, if live loads are predominant as compared to permanent uniformly distributed gravity loads, the arch will be subjected to substantial bending moments, thus losing a great part of its structural efficiency. In traditional arch bridges with hangers arranged in a vertical manner, asymmetrical loads would cause a substantial deviation of the pressure line from the axial line of the arch. In this paper, an innovative concept for timber arch bridges is introduced where V-shaped hangers, rather than vertical hangers, are used. The adoption of V-shaped hangers significantly contributes to the reduction of the eccentricity between the pressure line and the axial line of the arch, thus decreasing the magnitude of bending moments in the arch. The paper discusses the advantages of using V-shaped hangers as an alternative to vertical hangers, both in terms of statics, in-plane stability and dynamic efficiency. Moreover, the design and the recent construction of a parabolic three-hinged arch made of timber, with a steel V-shaped hanger is thoroughly discussed in the paper.

KW - Arch bridges

KW - buckling

KW - timber structures

KW - V-shaped

KW - vibrations

U2 - 10.1080/10168664.2018.1516124

DO - 10.1080/10168664.2018.1516124

M3 - Article

AN - SCOPUS:85064940681

VL - 29

SP - 261

EP - 267

JO - Structural Engineering International: Journal of the International Association for Bridge and Structural Engineering (IABSE)

JF - Structural Engineering International: Journal of the International Association for Bridge and Structural Engineering (IABSE)

SN - 1683-0350

IS - 2

ER -