E39 Bjørnafjorden - floating bridge – challenges and solutions

2016 ◽  
Author(s):  
Sverre Wiborg ◽  
Tina Vejrum ◽  
Erik Sundet ◽  
Per Norum Larsen ◽  
Bernt Sørby ◽  
...  
Keyword(s):  
Mooring Lines ◽  
Curved Bridge ◽  
Floating Bridge ◽  
Bridge Crossing

The purpose of this paper is to investigate the main challenges and corresponding solutions for a floating bridge crossing Bjørnafjorden. The paper investigates challenges related to quantification of loads, design of permanent structures as well as temporary phases. The paper evaluates a curved bridge without mooring lines, but considerations are partly valid for a straight bridge anchored to the seabed as well. Both solutions have been used, but the length of the Bjørnafjorden crossing is significantly larger than previous bridges and thus more challenging.

scholarly journals Effect of wave inhomogeneity on fatigue damage of mooring lines of a side-anchored floating bridge

2021 ◽  
Vol 219 ◽  
pp. 108304
Author(s):  
Jian Dai ◽  
Bernt Johan Leira ◽  
Torgeir Moan ◽  
Hagbart Skage Alsos
Keyword(s):  
Fatigue Damage ◽  
Mooring Lines ◽  
Floating Bridge

Mooring System Design and Optimization for Floating Bridge of Urmia Lake

2002 ◽  
Author(s):  
M. Daghigh ◽  
R. T. Paein Koulaei ◽  
M. S. Seif
Keyword(s):  
Burial Depth ◽  
Floating Bodies ◽  
Mooring Lines ◽  
Sea Floor ◽  
Design And Optimization ◽  
Sea Bed ◽  
Floating Bridge ◽  
The Mean

In order to get better understanding on the response of floating bodies, different design aspects of mooring lines has been investigated in this paper. Mooring lines are categerized into two types; the catenary settling on the sea floor (type 1) and the limited one which has no dead-length on sea floor (type 2). It has been observed that the stiffness of both types may be well predicted by Jain’s formulation and in the design process of floating bodies the mooring lines may be replaced by uncoupled horizontal and vertical springs. On the other hand, the anchor capacity against sliding and release from the mean still water has been studied in this paper. From the results of a parametric study, using the discrete element method, the block anchor the dimensions for the Urmia floating bridge has been optimized and the behavior of anchor and seabed deposits for release of block anchor indicates that the burial depth and the stress level on the block anchor itself and the sea bed are in the allowable and elastic region, respectively.

Crossing of Bjørnafjorden - Floating Bridge Concept

2016 ◽  
Author(s):  
Bruno Villoria
Keyword(s):  
Mooring Lines ◽  
Southern Shore ◽  
Navigation Channel ◽  
Floating Bridge

The purpose of this paper is to present the different floating bridge solutions that have been evaluated for the crossing of Bjørnafjorden. It appears to be feasible to place the navigation channel either in the middle of the fjord or in the vicinity of the southern shore. In both scenarios a straight bridge alternative anchored to the seabed and a curved solution without mooring lines are evaluated.

Comparison of Global Response of a 3-Span Floating Suspension Bridge With Different Floater Concepts

2016 ◽  
Author(s):  
Arnt G. Fredriksen ◽  
Basile Bonnemaire ◽  
Halvor Lie ◽  
Jan Munkeby ◽  
Anders Nesteby ◽  
...  
Keyword(s):  
Numerical Model ◽  
Structural Model ◽  
Wind Waves ◽  
Suspension Bridge ◽  
Point Of View ◽  
Irregular Waves ◽  
Floating Bridge ◽  
Bridge Crossing ◽  
Extreme Responses ◽  
Suspended Bridge

Several bridge concepts for crossing deep and wide fjords along E39 at the west coast of Norway have been developed the last years. One of the most challenging fjord crossing is suspected to be the crossing of Sulafjord, 3 to 5 km wide, 400 m deep and with presence of relatively large swell waves. A suspended floating bridge concept is a marine slender flexible structure with large volume elements as floating support. The hydrodynamic actions on the floaters is an additional excitation compared to a traditional suspended bridge with fixed piles. In order to assess the effects of this excitation, it is important to consider the whole system and accurate hydrodynamic methods. While the superstructure type — a suspended bridge — is set, the type of floating foundation remains open. From the offshore experience, it is seen that different types of floaters are used for moored platforms, and these floaters have significantly different characteristics in particular with regards to wave response and stability. The design requirements for an offshore platform differ greatly from those of a suspended floating bridge crossing a fjord. For a floating bridge, the payload requirements are not the most challenging, while it is more difficult to limit the tilting and dynamic excitation of the tower (mounted on the floaters). The bridge beam is suspended at the top of the towers and will respond to any excitation due to motions of the tower tops. A global numerical model of the bridge to simulate nonlinear dynamic response due to regular and irregular waves is built. The numerical model of the bridge is simplified from a structural point of view. However, the dynamical properties and eigenmodes are verified against a more detailed structural model. Together with a 50-year long continuous time-series of wind, wind waves and swells a study of the bridge operability and extreme responses for different floater concepts is conducted. Normally the design phase should aim at avoiding any natural periods to fall within the wave frequency domain. This seems difficult for the proposed 3-span floating suspension bridge, instead solutions to minimize the excitation from waves for wave periods around the given bridge eigenperiods are sought.

scholarly journals Homogeneous Wave Load Effects on the Connections of Main Parts of Side-Anchored Straight Floating Bridge

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Meysam Rajabi ◽  
Hassan Ghassemi ◽  
Hamidreza Ghafari
Keyword(s):  
Hydrodynamic Interaction ◽  
Numerical Study ◽  
Wave Force ◽  
Wave Forces ◽  
Mooring System ◽  
Wave Direction ◽  
Wave Load ◽  
Mooring Lines ◽  
Homogeneous Wave ◽  
Floating Bridge

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.

Sensitivity of a Floating Bridge Global Responses to Different Wave Drift Force Models

2021 ◽  
Author(s):  
Carlos Eduardo Silva de Souza ◽  
Nuno Fonseca ◽  
Marit Irene Kvittem
Keyword(s):  
Mooring Line ◽  
Sea State ◽  
Mooring Lines ◽  
Wave Drift ◽  
Floating Bridge ◽  
Promising Solution ◽  
Bridge Girder ◽  
Wave Drift Forces ◽  
Wave Incidence ◽  
Drift Forces

Abstract Floating bridges are a promising solution for replacing ferries in the crossing of Norwegian fjords. Their design involves the adoption of accurate, but at the same time efficient models for the loads the structure is subjected to. Wave drift forces at the bridge’s pontoon may excite the bridge’s lower horizontal modes, with consequences to the loads on the bridge and mooring lines. Newman’s approximation is normally adopted to calculate the wave drift forces in such applications. A common simplification is to assume that the pontoons are fixed in the calculation of wave drift coefficients, while it is known that wave frequency motions may significantly influence drift loads. This paper evaluates the consequences of this simplification, in comparison to coefficients obtained considering the pontoons’ motions. First, the effect of the bridge deflection, due to mean drift, on the pontoon’s motions, is evaluated. It is found that this effect is negligible. Then, the RAOs are used in the calculation of wave drift coefficients, showing very different results than those obtained with fixed pontoons. Time-domain simulations are then performed with wave drift coefficients calculated with both approaches, with focus on the bridge girder moments and mooring line tensions. It is shown that using wave drift coefficients obtained with fixed pontoon is a non-conservative simplification, depending on sea state and wave incidence direction.

A Research on Tension Determination and Morphological Simulation Model of Mooring Lines

ICTIS 2013 ◽  
2013 ◽  
Author(s):  
Shengli Li ◽  
Zhengwei He ◽  
Jia Shi ◽  
Youqin Zheng ◽  
Xiaoqiao Geng ◽  
...  
Keyword(s):  
Simulation Model ◽  
Mooring Lines

BRIDGE BUILDING AS A PROBLEM OF URBAN INFRASTRUCTURE DEVELOPMENT IN THE EUROPEAN NORTH OF RUSSIA IN THE EARLY XX CENTURY

2019 ◽  
Vol 15 (2) ◽  
pp. 125-135
Author(s):  
Tatiana S. Minaeva ◽  
Sergey S. Gulyaev
Keyword(s):  
Urban Infrastructure ◽  
Local Administration ◽  
Infrastructure Development ◽  
European North ◽  
Long Time ◽  
History Of ◽  
Floating Bridge ◽  
Historical Comparative ◽  
Bridge Building ◽  
Xix Century

Introduction. The organization of transport links and the bridge building in cities located on the banks of wide rivers has always been one of the most important tasks of the local administration. The study of the history of bridge building allows not only to trace the process of modernization of different regions of the country, but also to help in solving similar problems of our time. Nevertheless, the history of Russian bridge building is poorly studied. The purpose of the article is to determine the characteristics and features of the organization of bridge building in big cities of the European North of Russia as a way to solve one of the problems of urban infrastructure in the early XX century. Materials and Methods. The sources for this study are the documents of the State archive of the Arkhangelsk region, published documents on the history of Vologda, articles in the local periodicals of the early XX century. The analysis of the studied problem used a systematic approach, the method of economic analysis, historical and historical-comparative methods. Results and Discussion. The building of permanent bridges was a need for the development of Arkhangelsk and Vologda. In Vologda the two wooden bridges were built in the middle of XIX century on city funds and in the future these bridges were repaired or rebuilt. The Arkhangelsk city authorities did not hurry to solve a problem of city infrastructure by own efforts and a long time they used the floating bridge. The lack of experience in the building of large bridges and the desire to save money led to the rapid destruction of the first permanent bridge in Arkhangelsk. Conclusion. The Development of trade and industry in cities of the European North of Russia, such as Arkhangelsk and Vologda, led to the expansion of their territory and the emergence over time, the so-called third parts of the cities. Despite the comparable size of the population of the districts located across the river, the process of connecting them with bridges to the rest of the city went at different rates, which depended on the attitude of the local administration to the problem of urban infrastructure.

Sign in / Sign up

Export Citation Format

Share Document