In-Plant Arch Buckling of Network Arch Bridge




Introduction

Until several years ago only a few network arch bridges had been built, although it was its development started in the 1950s. But, as it can be seen in Table 1, in the last 5 years many network arches have been built in the whole world.



Network arches are defined by its inventor, Per

Tveit, as tied arch bridges with inclined hangers, that cross each other at least twice [7] (Figure 1). There are principally two reasons for today’s turning away from the traditional tied arch with vertical hangers towards the network arch. First, the reduction of maximum bending moments in arch and tie by a ratio of ≈1:10, which promises important material savings [5]. And second, the nowadays common use of powerful FEM software that allow the analysis of the highly hyperstatic structure within seconds.


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