A novel tri-semicircle shaped submerged breakwater for mitigating wave loads on coastal bridges part I: Efficacy

2022 ◽  
Vol 245 ◽  
pp. 110462
Author(s):  
Shihao Xue ◽  
Yong Xu ◽  
Guoji Xu ◽  
Jinsheng Wang ◽  
Qin Chen
Keyword(s):  
Wave Loads ◽  
Submerged Breakwater ◽  
Coastal Bridges

Nonlinear Wave Loads on a Submerged Deck by the Green–Naghdi Equations

2015 ◽  
Vol 137 (1) ◽  
Author(s):  
Masoud Hayatdavoodi ◽  
R. Cengiz Ertekin
Keyword(s):  
Shallow Water ◽  
Water Waves ◽  
Periodic Wave ◽  
Wave Forces ◽  
Two Dimensional ◽  
Wave Loads ◽  
Laboratory Measurements ◽  
Coastal Bridges ◽  
Inviscid Incompressible Fluid ◽  
Level I

We present a comparative study of the two-dimensional linear and nonlinear vertical and horizontal wave forces and overturning moment due to the unsteady flow of an inviscid, incompressible fluid over a fully submerged horizontal, fixed deck in shallow-water. The problem is approached on the basis of the level I Green–Naghdi (G–N) theory of shallow-water waves. The main objective of this paper is to present a comparison of the solitary and periodic wave loads calculated by use of the G–N equations, with those computed by the Euler equations and the existing laboratory measurements, and also with linear solutions of the problem for small-amplitude waves. The results show a remarkable similarity between the G–N and the Euler solutions and the laboratory measurements. In particular, the calculations predict that the thickness of the deck, if it is not “too thick,” has no effect on the vertical forces and has only a slight influence on the two-dimensional horizontal positive force. The calculations also predict that viscosity of the fluid has a small effect on these loads. The results have applications to various physical problems such as wave forces on submerged coastal bridges and submerged breakwaters.

A Comparative Study of Nonlinear Shallow-Water Wave Loads on a Submerged Horizontal Box

2014 ◽  
Author(s):  
Masoud Hayatdavoodi ◽  
R. Cengiz Ertekin
Keyword(s):  
Shallow Water ◽  
Water Waves ◽  
Wave Forces ◽  
Two Dimensional ◽  
Wave Loads ◽  
Laboratory Measurements ◽  
Linear Solution ◽  
Coastal Bridges ◽  
Inviscid Incompressible Fluid ◽  
Level I

This paper is concerned with calculations of the two-dimensional nonlinear vertical and horizontal forces and overturning moment due to the unsteady flow of an inviscid, incompressible fluid over a fully-submerged horizontal, fixed box. The problem is approached on the basis of the Level I Green-Naghdi (GN) theory of shallow-water waves. The main objective of this paper is to present a comparison of the solitary and cnoidal wave loads calculated by use of the GN equations, with those computed by Euler’s equations and the recent laboratory measurements, and also with a linear solution of the problem for small-amplitude waves. The results show a remarkable similarity between the GN and Euler’s models and the laboratory measurements. In particular, the calculations predict that the thickness of the box has no effect on the vertical forces and only a slight influence on the two-dimensional horizontal positive force. The calculations also predict that viscosity of the fluid has a small effect on these loads. The results have applications to various physical problems such as wave forces on submerged coastal bridges and submerged breakwaters.

Review of Wave Loads on Coastal Bridge Decks

2016 ◽  
Vol 68 (3) ◽  
Author(s):  
Masoud Hayatdavoodi ◽  
R. Cengiz Ertekin
Keyword(s):  
Failure Mechanism ◽  
Bridge Decks ◽  
Complex Problem ◽  
Wave Loads ◽  
Coastal Bridges ◽  
Structure Interaction ◽  
New Findings ◽  
Air Pockets ◽  
Tohoku Tsunami ◽  
Wave Induced

Recent natural extreme events, such as Hurricane Ike in the U.S. (2008), Tohoku tsunami in Japan (2011), and Typhoon Haiyan in Southeast Asia (2013), have caused significant damage to the decks of coastal bridges. The failure of the structure occurs when wave-induced loads on the decks of coastal bridges exceed the bridge capacity, resulting in partial removal or a complete collapse of bridge decks. Tsunami, storm waves, and storm surge are known to be the ultimate agents of such failures. An understanding of the failure mechanism and possible solutions require a better knowledge of the destructive loads on the structure. Interaction of surface waves with the bridge deck is a complex problem, involving fluid–structure interaction, wave breaking, and overtopping. Possible submergence of the deck and entrapment of air pockets between girders can increase destructive forces and add to the complexities of the problem. In recent years, remarkable progress has been made on this topic, resulting in some new findings about the failure mechanism and the destructive wave loads. A review of the key studies on wave loads on the coastal bridge decks, including those in the past and very recently, is presented here. Emphasis is given to the pioneering works that have significantly improved our understanding of the problem. Challenges associated with the existing solutions are highlighted, and suggestions for future studies are provided.

Wave Interaction With a Pair of Submerged Floating Tunnels in the Presence of An Array of Submerged Porous Breakwaters

2021 ◽  
Vol 143 (2) ◽  
Author(s):  
R. B. Kaligatla ◽  
Manisha Sharma ◽  
T. Sahoo
Keyword(s):  
Water Depth ◽  
Eigenfunction Expansion ◽  
Wave Interaction ◽  
Expansion Method ◽  
Wave Forces ◽  
Intermediate Water ◽  
Angle Of Incidence ◽  
Wave Loads ◽  
Submerged Breakwater ◽  
Eigenfunction Expansion Method

Abstract In this article, a coupled model is proposed for wave interaction with a pair of submerged floating tunnels in the presence of an array of bottom-standing trapezoidal porous breakwaters. The theory of Sollitt and Cross is adopted to govern the fluid flow inside the porous medium. For constant water-depth, the eigenfunction expansion method is employed, whereas for varying water-depth, the eigenfunction expansion method along with the mild-slope approximation is employed. The solutions, thus derived, are matched at the shared boundaries under defined physical conditions. First, the performance of a single breakwater of impermeable and permeable type in reducing wave forces on tunnels is analyzed. Next, the performance of two and three submerged breakwaters is studied. The reflection and transmission coefficients of waves are high in the absence of the submerged breakwater and in the presence of an impermeable breakwater. These coefficients significantly reduce in the presence of the submerged porous breakwater. As a result, the horizontal and vertical forces acting on bridges and tunnels are substantially subsided. Wave forces on tunnels reduce with an increase in the angle of incidence. Multiple porous breakwaters show better performance in mitigating wave forces on tunnels. Higher wave force on tunnels is noticed in intermediate water-depth. The findings can enhance the knowledge of submerged porous breakwaters’ performance in reducing wave loads on bridges and tunnels.

EXPERIMENTAL STUDY OF WAVE LOADS ON COASTAL BRIDGES AND THE ROLE OF AIR

2009 ◽  
Author(s):  
Giovanni Cuomo ◽  
Ken-ihiro Shimosako ◽  
Shigeo Takahashi ◽  
Tatsuo Ookama ◽  
Katsunobu Morohoshi
Keyword(s):  
Experimental Study ◽  
Wave Loads ◽  
Coastal Bridges

scholarly journals Evaluation of Ride Comfort and Driving Safety for Moving Vehicles on Slender Coastal Bridges

2018 ◽  
Vol 140 (5) ◽  
Author(s):  
J. Zhu ◽  
W. Zhang ◽  
M. X. Wu
Keyword(s):  
Ride Comfort ◽  
Comprehensive Evaluation ◽  
Evaluation Criteria ◽  
Weather Conditions ◽  
Dynamic Responses ◽  
Evaluation Methodology ◽  
Driving Safety ◽  
Wave Loads ◽  
Coastal Bridges ◽  
Moving Vehicles

Evaluating driving safety of moving vehicles on slender coastal bridges as well as bridge safety is important to provide supporting data to make decisions on continuing or closing the operations of bridges under extreme weather conditions. However, such evaluations could be complicated due to the complex dynamic interactions of vehicle-bridge-wind-wave (VBWW) system. The present study proposes a comprehensive evaluation methodology on vehicle ride comfort and driving safety on the slender coastal bridges subject to vehicle, wind, and wave loads. After a brief introduction of the VBWW coupling dynamic system and obtaining the dynamic responses of the vehicles, the vehicle ride comfort is evaluated using the advanced procedures as recommended in the ISO 2631-1 standard based on the overall vibration total value (OVTV). The vehicle driving safety is analyzed based on two evaluation criteria, i.e., the roll safety criteria (RSC) and the sideslip safety criteria (SSC), through the vehicle contact force responses at the wheels. Finally, the proposed methodology is applied to a long-span cable-stayed bridge for the vehicle ride comfort and driving safety evaluation.

Rehabilitation and Preservation of Oregon’s Historic Concrete Coastal Bridges

1997 ◽  
Vol 1601 (1) ◽  
pp. 9-12 ◽  
Author(s):  
Galen McGill ◽  
Terry Shike
Keyword(s):  
New Technology ◽  
Corrosion Damage ◽  
Cultural Resources ◽  
Construction Project Management ◽  
Coastal Bridges ◽  
Bridge Program ◽  
Design Engineers ◽  
Management Personnel ◽  
Protection Technology ◽  
Significant Concentration

Oregon’s Coastal Bridge Program was designed to preserve the economic and cultural resources invested in Oregon’s coastal bridges. The Oregon Coast Highway contains a significant concentration of bridges listed on or eligible for the National Historic Register. Many of these reinforced concrete structures are suffering extensive corrosion damage resulting from years of exposure to the marine environment. Oregon has developed this program to evaluate, prioritize, and preserve these magnificent bridges. Preservation of these bridges has relied on the innovative application of cathodic protection technology. This new technology has been applied successfully through a project design and construction process that includes ongoing interaction among design engineers, researchers, construction project management personnel, and contractors.

Kajian Model Fisik Pengaruh Freeboard dan Susunan Buis Beton Sebagai Pemecah Gelombang Tenggelam Ambang Rendah (Pegar) Dalam Mereduksi Gelombang

2017 ◽  
Vol 1 (2) ◽  
pp. 34
Author(s):  
Zulkarnain Zulkarnain ◽  
Nadjadji Anwar
Keyword(s):  
Low Cost ◽  
Relative Depth ◽  
Submerged Breakwater ◽  
Wave Flume ◽  
Concrete Cylinder ◽  
Engineering Department ◽  
Sea Area ◽  
The Waves ◽  
Transmission Test ◽  
Better Than

The Research Center and Development of Water (Puslitbang) is currently developing the Submerged Breakwater in shallow sea area (PEGAR). The author is interested to examine the material that easily obtained in the field of RCP concrete cylinder. The observation is how it to be ability in function as submerged breakwater an go green and low cost. The physical model of wave transmission test is how the response to the structure in ability to damping of wave as the breakwater function. In this research breakwater used is submerged breakwater type by using concrete cylinder (buis beton). The purpose from this research is to know how the response of breakwater structure to the waves through it, with some variation of the structure by creating a structure with three variations of the arrangement and freeboard that is the relative depth with the crest width is constant. The wave generated test in this study is using regular waves in wave flume at FTSP Civil Engineering Department of Institute Technology Ten November. From the analysis of the effect of the installation of submerged breakwater by using concrete cylinder to the wave damping value, it can be concluded that the factors that are very influential is the freeboard and the composition of concrete cylinder. Scenario A (rigid vertical massive) is capable of producing the smallest value of kt is 0.33. As for scenario B (rigid horyzontal massive) with a damping value of 0.5, while the scenario C (rigid permeable) is only able to produce kt value of 0.71. Scenario A is better than scenario B and C Because the position of arrangement of A is very good used to damp wave in small or big freeboard conditions.

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