Wave Forces on Groups of Slender Cylinders in Comparison to an Isolated Cylinder Due to Non-Breaking Waves

Hildebrandt, Arndt; Sparboom, Uwe; Oumeraci, Hocine

doi:10.1142/9789814277426_0312

Cited by 8 publications

(10 citation statements)

References 9 publications

(8 reference statements)

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“…In order to predict the wave loads on the pile-group, the laboratory approaches are usually adopted in which the wave load on a slender pile within a pile-group is calculated by multiplying the wave load on an individual pile with an experimentally determined force coefficient. Recently, Bonakdar et al [34] proposed the wave force coefficients to modify the Morison equation to predict the wave-induced force on a slender pile within a pile-group with various configurations, which were found to agree well with the experimental data in the literature [35,36]. In the present study, the wave force coefficients proposed by Bonakdar et al [34] are adopted to calculate the wave force for the slender pile within pile-group with the arrangement shown in Fig.…”

Section: Modeling Of the Bridge And The Vehiclessupporting

confidence: 68%

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

Zhu

Zhang

2018

Journal of Vibration and Acoustics

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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.

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Section: Modeling Of the Bridge And The Vehiclessupporting

confidence: 68%

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

Zhu

Zhang

2018

Journal of Vibration and Acoustics

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“…The knowledge of this distance, as well as of the values of eroded sediment, is of practical use for the design of a scour protection system and the required spatial extent. around circular cylinders [16][17][18], which is partly transferred as a border of influence for global scouring processes [10]. The present jacket model has a spacing of ~14 D between the pile centers, which is far above a previously described critical distance of 6 D. The volume analysis presented in paragraph 3 proves that there is a significant influence on the global erosion for areas > 6 D for the present structure.…”

Section: Local Scour Around Individual Pilesmentioning

confidence: 71%

“…Furthermore, it is reported that hydrodynamic interactions between individual circular piles are small if the distance between them exceeds six times the piles' diameter (see e.g. [16][17][18]). Bolle et al [10] transferred this knowledge to jacket structures, arguing that the distance was clearly above 6 D in their study and thus global scour does not have to be considered.…”

Section: Introductionmentioning

confidence: 99%

Volume-Based Assessment of Erosion Patterns around a Hydrodynamic Transparent Offshore Structure

et al. 2019

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The present article presents results of a laboratory study on the assessment of erosion patterns around a hydrodynamic transparent offshore foundation exposed to combined waves and currents. The model tests were conducted under irregular, long-crested waves in a scale of 1:30 in a wave-current basin. A terrestrial 3D laser scanner was used to acquire data of the sediment surface around the foundation structure. Tests have been conducted systematically varying from wave- to current-dominated conditions. Different volume analyzing methods are introduced, which can be related for any offshore or coastal structure to disclose physical processes in complex erosion patterns. Empirical formulations are proposed for the quantification of spatially eroded sediment volumes and scour depths in the near-field and vicinity of the structure. Findings from the present study agree well with in-situ data stemming from the field. Contrasting spatial erosion development between experimental and in-situ data determines a stable maximum of erosion intensity at a distance of 1.25 A, 1.25 times the structure’s footprint A, as well as a global scour extent of 2.1–2.7 A within the present study and about 2.7–2.8 A from the field. By this means, a structure-induced environmental footprint as a measure for erosion of sediment affecting marine habitat is quantified.

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“…A single isolated pile and 14 pile group configurations including side by side, tandem and staggered arrangements with gaps of up to three times the pile diameter (1 ≤ S G /D ≤ 3) were tested. The results were analysed by , , Hildebrandt et al (2008), Bonakdar andOumeraci (2012, 2014) and Bonakdar (2014). Some of the general conclusions drawn from these analyses are:…”

Section: Introductionmentioning

confidence: 99%

Wave load formulae for prediction of wave-induced forces on a slender pile within pile groups

Bonakdar

Oumeraci

Etemad‐Shahidi

2015

Coastal Engineering

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Pile-supported structures commonly found in both offshore (e.g. offshore oil and gas platforms) and coastal environments (e.g. sea bridges, piers and jetties) are generally built by means of a group of piles in different arrangements. The correct prediction of the wave loading of closely-spaced piles of these structures is vital for both safety and economical viewpoints. Unlike single isolated piles, where a large number of studies are available together with the well-known Morison equation which is still widely applied for the calculation of wave-induced force, less research studies have been made on wave-pile group interactions. In fact, no reliable wave load formula is yet available for the prediction of wave-induced forces on a slender pile, for which the pile diameter (D) is generally less than about 0.2 times the wave length (L), within a pile group. In this study, new wave load formulae for the prediction of wave-induced force on a slender pile in pile groups with different arrangements are developed using a series of laboratory data obtained from systematic model tests conducted in the 2 m-wide wave flume of Leichtweiss-Institute for Hydraulic Engineering and Water Resources (LWI) in Braunschweig, Germany. For the analysis of the laboratory data and the development of the new prediction formulae, an artificial intelligence (AI)-based computational tool, named "hybrid M5MT-GP model", is implemented. The new hybrid model and the new wave load formulae allow us to systematically assess the pile group effect (K G ) as a function of the flow regime (KC number) and the relative spacing (S G /D) for each tested pile group arrangement. The results show that the pile group effect needs to be considered in calculating wave loads on the slender piles in pile groups, unless K G = 1 where there is no interference effect between neighbouring piles and piles in the group can be treated as a single isolated pile. The accuracy of the new formulae in predicting pile group effect K G is confirmed by the statistical indicators using agreement index I a , correlation coefficient CC and scatter index SI.

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Wave Forces on Groups of Slender Cylinders in Comparison to an Isolated Cylinder Due to Non-Breaking Waves

Cited by 8 publications

References 9 publications

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

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

Volume-Based Assessment of Erosion Patterns around a Hydrodynamic Transparent Offshore Structure

Wave load formulae for prediction of wave-induced forces on a slender pile within pile groups

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