Abstract
In this paper, a numerical study is presented to investigate wave force on the connections of main parts of a side-anchored straight floating bridge concept for the Bjørnafjorden fjord crossing. The floating bridge is supported by 18 pontoons, and three groups of mooring lines are employed to restrain the bridge against horizontal loads and increase its transverse stiffness. The created wave forces at the connections of pontoon-column and column-girder of the floating bridge considering the effects of short-crested and long-crested waves, varying wave direction, hydrodynamic interaction between pontoons, and mooring system are analyzed. It is found that short-crested and long-crested waves depending on their direction decrease or increase the wave forces on the joints. Considering that the effect of hydrodynamic interaction between pontoons can increase or reduce the wave forces and moments created in the joints, which means the neglect of the hydrodynamic interaction effects between the pontoons to simplify the modeling of this type of floating bridge, may be unacceptable. Moreover, the results showed that the bridge mooring system does not merely reduce the wave forces and moments at joints along the bridge.
Highlights
Floating bridges are structures that create a span over a body of water that is between two lands using a set of pontoons and a continuous girder
The mooring line system resists against the transverse and longitudinal loads, and buoyancy resists against vertical loads [2]. e curved end-anchored bridge (CEAB) is an inclined arch bridge girder resting on 19 unmoored pontoons, where the curve provides persistence against the loads by using the axial force from the end anchoring (Figure 1(c)). e CEAB and side-anchored straight bridge (SASB) concepts have a navigation channel; depending on their location, the configuration of the bridge may be changed [3]. e suspension bridge with floating pylons consists of a three-span bridge with two floating tension leg Mathematical Problems in Engineering (b) platform floaters (Figure 1(d)) [4]
LC1, LC3, long-crested wave with direction 315° (LC5), and LC7 are defined for column-girder joints, and LC2, LC4, LC6, and LC8 are defined for pontoon-column joints. e wind waves created in a fjord may be in the short-crested form
Summary
Floating bridges are structures that create a span over a body of water that is between two lands using a set of pontoons and a continuous girder. This type of bridge is suggested in areas where the construction of a fixed bridge is not cost-effective due to deep water, or it is not possible to build a foundation with necessary resistance due to the loose and soft seabed. The side-anchored straight bridge (SASB) is a straight bridge, including a long steel girder, which is placed on the 18 moored pontoons In this concept, the mooring line system resists against the transverse and longitudinal loads, and buoyancy resists against vertical loads [2]. The mooring line system resists against the transverse and longitudinal loads, and buoyancy resists against vertical loads [2]. e curved end-anchored bridge (CEAB) is an inclined arch bridge girder resting on 19 unmoored pontoons, where the curve provides persistence against the loads by using the axial force from the end anchoring (Figure 1(c)). e CEAB and SASB concepts have a navigation channel; depending on their location, the configuration of the bridge may be changed [3]. e suspension bridge with floating pylons consists of a three-span bridge with two floating tension leg
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