Characteristics of wave forces on pile group foundations for sea-crossing bridges

Wang, Zhenguo; Qiu, Wenliang

doi:10.1016/j.oceaneng.2021.109299

Cited by 26 publications

(4 citation statements)

References 30 publications

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“…The wave torque acting on the azimuth gimbal is periodic, and its maximum value under the level 4 sea conditions is calculated by the Morrison formula [ 33 ]. Therefore, a sine function is proposed to represent

, that is,

…”

Section: Simulations and Experimentsmentioning

confidence: 99%

Research on the Line of Sight Stabilization Control Technology of Optronic Mast under High Oceanic Condition and Big Swaying Movement of Platform

Lan

Jiang

Hua

2023

Sensors

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To realize high-performance line of sight (LOS) stabilization control of the optronic mast under high oceanic conditions and big swaying movements of platforms, a composite control method based on an adaptive radial basis function neural network (RBFNN) and sliding mode control (SMC) is proposed. The adaptive RBFNN is used to approximate the nonlinear and parameter-varying ideal model of the optronic mast, so as to compensate for the uncertainties of the system and reduce the big-amplitude chattering phenomenon caused by excessive switching gain in SMC. The adaptive RBFNN is constructed and optimized online based on the state error information in the working process; therefore, no prior training data are required. At the same time, a saturation function is used to replace the sign function for the time-varying hydrodynamic disturbance torque and the friction disturbance torque, which further reduce the chattering phenomenon of the system. The asymptotic stability of the proposed control method has been proven by the Lyapunov stability theory. The applicability of the proposed control method is validated by a series of simulations and experiments.

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, that is,

…”

Section: Simulations and Experimentsmentioning

confidence: 99%

Research on the Line of Sight Stabilization Control Technology of Optronic Mast under High Oceanic Condition and Big Swaying Movement of Platform

Lan

Jiang

Hua

2023

Sensors

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“…We introduce K cp into the theoretical formula of wave forces on pile groups [37], which can be expressed as follows:…”

Section: Modified Theoretical Formula For Calculating Wave Forces Con...mentioning

confidence: 99%

Effect of Square Cap on Pile-Group Wave Force: Parametric Analysis and Case Study

Ma,

Liu,

Chang

et al. 2023

JMSE

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The square cap is a typical semi-submersible component of sea-crossing bridges, which connects piers and pile-group foundations. As the cap size is large, it usually has a non-negligible influence on the wave motion around the pile-group foundation, so it is not considered in the relevant specification. However, neglecting this influence may have adverse effects on the structure. In this paper, the wave forces on capped pile groups are simulated by a numerical wave flume. Firstly, the numerical flume used in this paper is validated by an experiment in the previous literature. Then, capped pile groups with different arrangements and different water levels are modeled to study the interference effect of the square cap on the wave force, and the variation law of the interference effect coefficient Kcp of the cap is given. Next, we introduce Kcp into the theoretical formula of wave forces on pile groups and obtain a modified formula that considers the cap effect. To verify the feasibility of the modified formula in practical engineering, we use the formula to calculate the wave forces acting on capped pile groups of a sea-crossing bridge. The results of the modified theoretical formula are compared with that of the numerical water flume and recommended values in the specification. It is found that the theoretical values are relatively close to the numerical results, while the specification values tend to be conservative. The modified theoretical formula proposed in this paper and the obtained parameter distribution law can provide a reference for engineering design.

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“…With the exploitation of marine resources, the construction of cross-sea bridges [1,2], offshore wind power [3], and maintenance and repair (IMR) operations [4] has started to develop towards deeper waters. Consequently, deep-water pile foundations are developing towards having larger diameters [5,6] to cope with complex marine environments.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Hydrodynamic Behavior of a Remotely Operated Vehicle in Multi-Directional Flow

Cao¹,

Lyu²,

Peng³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

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In recent years, Remotely Operated Vehicles (ROVs) have played an increasingly important role in the construction and monitoring of underwater pile foundations. However, due to the open frame structure of such vehicles, a gap of knowledge still exists with regard to their hydrodynamic behavior. In this study, the hydrodynamic stability of such vehicles is investigated numerically by means of a multiple reference frame method. The hydrodynamic characteristics of the ROV when it moves horizontally and upward in the vertical plane are examined. It is found that there is interference between the horizontal and vertical thrusters of the ROV. There is also interference between the propeller thrust and drag (or lift). The effect of the vertical thrusters can increase the horizontal thrust by about 5%. The horizontal thrusters create a low-pressure area below the body, which can make vertical drag experienced by the ROV significantly higher.

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Characteristics of wave forces on pile group foundations for sea-crossing bridges

Cited by 26 publications

References 30 publications

Research on the Line of Sight Stabilization Control Technology of Optronic Mast under High Oceanic Condition and Big Swaying Movement of Platform

Research on the Line of Sight Stabilization Control Technology of Optronic Mast under High Oceanic Condition and Big Swaying Movement of Platform

Effect of Square Cap on Pile-Group Wave Force: Parametric Analysis and Case Study

Numerical Analysis of the Hydrodynamic Behavior of a Remotely Operated Vehicle in Multi-Directional Flow

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