Abstract
In tied-arch bridges with a single arch, the deck is usually suspended from the arch by means of a single set of cables, pinned at both ends and anchored to the centerline, using either vertical or Nielsen-type hanger arrangements. When properly designed, this layout can significantly reduce forces and deflections under loads that are symmetrical with respect to the plane of the arch. However, it does not contribute to the support of nonsymmetrical loads, such as eccentric loads distributions or wind loading, and does not reduce the sensibility of the arch to out-of-plane buckling. Thus, this paper studies how a cable arrangement composed of two sets of lateral hangers, attached to both edges of a deck, can be very suitable to address these problems. Firstly, it is demonstrated that the structural behavior under symmetrical loads improves with respect to the bridge with centered hangers. Secondly, it is shown how nonsymmetric loads are partially carried by structural systems (such as the transversal stiffness both of the arch and the deck) that would remain inactive for tied-arch bridges with centered hangers, leading to a general reduction in the forces and the deflections of the bridge and in the critical buckling load of the arch.
Highlights
In tied-arch bridges with a single arch, the most common method of linking the arch and the deck is by suspending the deck from the arch by means of a single set of cables, pinned at both ends, anchored to the centerline
The objective of this paper is to study how a cable arrangement, composed of two sets of lateral hangers, that links the arch to the two edges of the deck can be used by the designer as a strategy to satisfy serviceability and failure requirements in a tied-arch bridge under eccentric loads, i.e., whose resultant is not contained in the plane of the arch
The following conclusions can be drawn from the studies carried out in this research: In tied-arch bridges, the most frequent method of linking the arch and the deck is by means of a single set of hangers that links the arch and the axis of the deck, using either vertical or Nielsen-type hangers
Summary
In tied-arch bridges with a single arch, the most common method of linking the arch and the deck is by suspending the deck from the arch by means of a single set of cables, pinned at both ends, anchored to the centerline. This solution has been studied in detail by García-Guerrero and Jorquera-Lucerga [12,13] and involves additional structural systems (such as out-of-plane bending and torsional stiffness both of the arch and the deck) to help limit forces and deflections Another possible alternative within the designer’s possibilities, consists, of doubling the set of hangers and attaching the arch to both edges of the deck (Figure 3b) by means of two lateral sets of hangers. The objective of this paper is to study how a cable arrangement, composed of two sets of lateral hangers, that links the arch to the two edges of the deck can be used by the designer as a strategy to satisfy serviceability and failure requirements in a tied-arch bridge under eccentric loads, i.e., whose resultant is not contained in the plane of the arch When properly used, this strategy has the advantage where the cross-sections, both of the arch and the deck, do not need to be enlarged.
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