Overview of Floating Bridge Projects in Norway

Abstract

This paper describe the development of floating bridge projects along the coast of Norway. Over the decades, the need to replace existing ferry connections with fixed linkes has beed rapidly increasing. However, the Norwegian nature with its deep and wide fjords, together with low traffic numbers have given the engineers big challenges in designing cost effective bridges for many of the crossings. One solution that was developed in the late 80s and early 90s by a combination of offshore technology and bridge technology was the end-anchored floating bridge concept. So far, two bridges of this design have been completed, the Bergsøysund Bridge and the Nordhordland Bridge. Prof. Moan was a key contributer in the developing work, enabling a safe design of the bridges. As the remaining ferry crossings are even deeper and wider, there is a need to further develop this concept, as well as developing new concepts, so that we are able to replace even further ferries with fixed links. The paper will look back at the two already buildt floating bridges, as well as the floating bridge concepts that might be used to cross the Bjørnafjord, on the west coast of Norway.

Wave diffraction from multiple truncated cylinders of arbitrary cross sections

“…Multiple caissons arise in many offshore projects, such as floating bridges [43] and mobile offshore bases [1]. In this section, the case of two caissons (Fig.…”

Wave radiation from a truncated cylinder of arbitrary cross section

“…Vertical cylinders with elliptical cross sections can be adopted as the foundations of some coastal/offshore bridges as well (Wan et al, 2017). A more common shape of the bridge's foundation, however, might be a quasi-elliptical section (Liu et al, 2017;Eidem 2017). For all these marine structures, the radiation problem of a cylinder with different cross-sections is involved in either their operation or installation.…”

“…"rectangular" or "quasi-elliptical". Recently, Liu et al (2016;2017) solved the wave diffraction problem of a uniform (i.e. bottom mounted) and a truncated cylinder with non-circular/elliptical cross section, respectively.…”

“…A semi-analytical model for solving such problem is presented based on linear potential flow theory. The Fourier series expansion method previously used by Liu et al (2016;2017) for wave diffraction problem is applied to deal with the radius function associated terms. The rest of the paper is organized as follows.…”

Hydrodynamic load modeling and analysis of a floating bridge in homogeneous wave conditions

“…The site considered in this study is the Bjørnafjorden located on the west coast of Norway, as shown in Fig. 1 Several floating bridge concepts have been proposed for the crossing of Bjørnafjorden, including submerged floating tube bridge concept, cable stayed bridge with towers supported by TLP (tension leg platform) concept, sideanchored straight pontoon supported floating bridge concept, and end-anchored curved pontoon supported floating bridge concept [2]. Among them the endanchored curved floating bridge concept is considered in this study, as shown in Figs.…”