Abstract
Purpose. Investigation and analysis of the hanger arrangement and the structural stability of a Network arch bridge – a tied-arch bridge with inclined hangers that cross each other at least twice. It is also necessary to make a comparative analysis with other types of hanger arrangements. Methodology. The authors in their research investigated a large number of parameters to determine their influence in the force distribution in the arch. Eventually they determined optimal values for all parameters. These optimal values allowed developing a design guide that leads to optimal arch design. When solving this problem, the authors used three-dimensional finite element models and the objective was to determine the most suitable solution for a road bridge, with a span of 100 meters, consisting of two inclined steel arches, located on a road with two traffic lanes, subjected to medium traffic. The virtual prototype of the model is performed by finite element simulator Midas Civil. Findings. In this study, for the bridge deck, a concrete tie appears to be the best solution considering the structural behavior of network arches, but economic advantages caused by easier erection may lead to steel or a composite bridge deck as better alternatives. Design requirements and local conditions of each particular bridge project will decide the most economic deck design.Originality. To ensure passenger comfort and the stability and continuity of the track, deformations of bridges are constricted. A network arch is a stiff structure with small deflections and therefore suitable to comply with such demands even for high speed railway traffic. A network arch bridge with a concrete tie usually saves more than half the steel required for tied arches with vertical hangers and concrete ties. Practical value. Following the study design advice given in this article leads to savings of about 60 % of structural steel compared with conventional tied arch bridges with vertical hangers.
Highlights
This paper discusses aspects of designing of «network arch» type tied-arch bridge superstructures with the polygonal top chord and flexible inclined hangers
In the arch with vertical hangers, bending is a decisive factor when it comes to the choice of the cross-section of the chords
– Choice of hanger net construction scheme; – Determination of reasonable hanger inclination angle; – Calculation of the most rational number of hangers; – Analysis of solution cost-effectiveness as compared to superstructures with vertical hangers; This paper presents selection of information both from foreign practice of this type bridge designing and construction, and from the author’s own researches
Summary
This paper discusses aspects of designing of «network arch» type tied-arch bridge superstructures with the polygonal top chord and flexible inclined hangers. – Choice of hanger net construction scheme; – Determination of reasonable hanger inclination angle; – Calculation of the most rational number of hangers; – Analysis of solution cost-effectiveness as compared to superstructures with vertical hangers; This paper presents selection of information both from foreign practice of this type bridge designing and construction, and from the author’s own researches.
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