Influences of the pile-restrained floating breakwater on extreme wave forces of coastal bridge with box-girder superstructure under the action of two-dimensional focused waves

Huang, Bo; Hou, Jie; Yang, Zhiying; Zhou, Jianting; Ren, Qingyang; Zhu, Bing

doi:10.1016/j.apor.2023.103508

Cited by 19 publications

(4 citation statements)

References 51 publications

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“…The specific extension step lengths for each step are shown in Table 2, and the crack changes throughout the extension process are shown in Figures 16-22. Due to the relatively large number of extension steps, only the crack changes for some key extension steps are shown [35,36]. The stress intensity factor for each key extension step was calculated using the method of calculating the stress intensity factors for the initial crack, and the results are shown in Figure 24.…”

Section: Fatigue Cracking's Locationmentioning

confidence: 99%

Fatigue Life Evaluation of Orthotropic Steel Deck of Steel Bridges Using Experimental and Numerical Methods

et al. 2023

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Orthotropic steel deck (OSD) structures are widely used in the bridge deck system of rail transit bridges. Reducing the amplitude of the stress intensity factor is the most effective method to improve the fatigue life of OSD structures. In order to explore the fatigue crack propagation of the OSD structure and the factors affecting the amplitude of the structural stress intensity factor, linear elastic fracture mechanics and Paris’ law is used for theoretical support in this paper. Firstly, a cable-stayed bridge of urban rail transit is taken as the research object, a full-scale segment model of the OSD structure is designed and static and fatigue tests are carried out. Based on the test data, the fatigue life of the structure is simulated and predicted. Finally, ABAQUS and Franc3D are used to analyze the influence of parameters, such as U-rib thickness, roof thickness and diaphragm thickness, of the OSD structure on the amplitude of the stress intensity factor. The test and FEM analysis results show that the thickness of diaphragm and the height of the U-rib have little effect on the fatigue life of the OSD structure, appropriately increasing the thickness of the top plate and U-rib has a positive significance for prolonging the fatigue life of the structure. In addition, it is also of reference value to the application of sustainability and the science of sustainable development.

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Section: Fatigue Cracking's Locationmentioning

confidence: 99%

Fatigue Life Evaluation of Orthotropic Steel Deck of Steel Bridges Using Experimental and Numerical Methods

et al. 2023

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“…Regardless of the influence of material properties, stress amplitude is the key factor in the fatigue evaluation of steel bridges. Therefore, it can be considered that the chief cause of fatigue cracking at the peak point A of a diaphragm's arc opening is in-plane stress [30,[39][40][41][42][43]. Out-of-plane stress has a minor effect on fatigue cracking at the peak point A.…”

Section: Stress Composition Of Diaphragm's Arc Opening Areamentioning

confidence: 99%

Study on Fatigue Cracking of Diaphragm’s Arc Opening of OSD in Steel Bridges by Using Biaxial Stress Method

Zeng

Kang

et al. 2023

Materials

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Changes in loading position have a significant impact on the stress field of each vulnerable area of an orthotropic steel deck (OSD). The arc opening area of the diaphragm and the connecting area between the U-rib and the diaphragm under the moving load are prone to fatigue cracking. By comparing the stress responses under different methods, the hot spot stress (HSS) method is used as the main stress extraction method in fatigue performance evaluation. The control stress of fatigue cracking was analyzed by comparing the direction of the principal stress field with the crack direction in this experiment. According to the stress amplitude deviation under the biaxial stress state, a set of methods for evaluating the effects of in-plane biaxial fatigue was developed. An improved luffing fatigue assessment S–N curve was applied to analyze the fatigue life of the diaphragm’s arc opening area. The results show that when the moving load is exactly above the connection of the deck and the web of the U-rib on one side, it is in the most unfavorable position in the transverse direction, and the diaphragm is mainly under the in-plane stress state. The longitudinal range of the stress influence line of the arc opening is approximately twice the diaphragm spacing. Two to three stress cycles are caused by one fatigue load. Fatigue crack control stress is the principal stress tangential to the arc opening’s edge in this area. The normal direction of the principal stress in the model test is roughly consistent with the crack initiation direction. The variation in the stress amplitude deviation in this area is caused by changes in the action position of the moving load. When the moving load is at a certain distance from the involved diaphragm, it is reduced to zero, implying that the in-plane fatigue effect is the greatest in this area.

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“…where G k is the turbulent energy generation term caused by the mean velocity gradient, G b is the turbulent energy generation term caused by buoyancy, Y M represents the contribution of pulsation expansion in turbulence, C 1ε , C 2ε and C 3ε are empirical constants, σ k and σ ε are the Prandtl numbers corresponding to the turbulent energy k and dissipation rate ε, respectively, and S k and S ε are source terms. The introduction of a turbulence model is instrumental in enhancing the precision of the calculation of wave forces on offshore bridge superstructures and wave-structure interactions [3,26].…”

Section: Wave-structure Interactionmentioning

confidence: 99%

“…In comparison, the reduction in vertical wave force caused by the floating breakwater is more significant than that of horizontal wave force. A wave-structure coupling method was proposed and utilized to numerically investigate the focused wave forces on a two-dimensional coastal bridge with a box-girder superstructure under the influence of a pile-restrained floating breakwater by Huang et al [26]. A study of the effectiveness of floating breakwaters in protecting a box-girder superstructure from extreme wave damage was conducted by them, and the effects of floating breakwater control parameters on extreme wave forces were investigated.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Wave Forces on the Box-Girder Superstructure of the Offshore Bridge with the Influence of Floating Breakwater

Wang

Liu

Chen

et al. 2023

JMSE

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In recent years, with global warming and frequent natural disasters, existing offshore bridges are facing the risk of extreme wave action. The research on disaster prevention and mitigation measures of the box-girder superstructure of offshore bridges under extreme wave action is still scarce. In this paper, a numerical model based on the RANS equation and k-ε turbulence model is established to study the wave forces on the box-girder superstructures of offshore bridges with the influence of a floating breakwater. A numerical method for studying the interaction of waves and structures is proposed and verified through experimental data. The effects of many parameters of the floating breakwater on wave attenuation are investigated and a prediction model of the wave reduction rate based on neural network algorithm is proposed. The results show that the reduction rate of wave forces for fixed breakwaters can reach more than 30%, which indicates that a floating breakwater has a significant effect in reducing the wave forces on the box-girder superstructure. The wave reduction performances of the displacement-restricted breakwater and the fixed breakwater are better than that of an elastic restricted breakwater. The prediction model proposed based on the BP neural network is accurate in estimating the maximum wave forces on the box-girder superstructure with the influence of the floating breakwater.

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Influences of the pile-restrained floating breakwater on extreme wave forces of coastal bridge with box-girder superstructure under the action of two-dimensional focused waves

Cited by 19 publications

References 51 publications

Fatigue Life Evaluation of Orthotropic Steel Deck of Steel Bridges Using Experimental and Numerical Methods

Fatigue Life Evaluation of Orthotropic Steel Deck of Steel Bridges Using Experimental and Numerical Methods

Study on Fatigue Cracking of Diaphragm’s Arc Opening of OSD in Steel Bridges by Using Biaxial Stress Method

Prediction of Wave Forces on the Box-Girder Superstructure of the Offshore Bridge with the Influence of Floating Breakwater

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