Experiment and Calculation Method of the Dynamic Response of Deep Water Bridge in Earthquake

Li, Yue; Zhi, Li; Wu, Qing

doi:10.1590/1679-78253872

Cited by 13 publications

(6 citation statements)

References 10 publications

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“…It was found that the presence of water around the pier reduced the natural frequency of the pier. Similarly, Li et al [6] reported that the vibration periods of bridge piers increased in the presence of water, and the natural frequency of deep-water bridges was low. Under earthquake action, the fluid-structure interaction increased the internal force at the bridge girders and the piers' bottom.…”

Section: Introductionmentioning

confidence: 86%

Experimental Study on Effect of Water Depth on Earthquake Response of a Deep-water Cable-stayed Bridge Tower

Geng

Leng

et al. 2023

J. Phys.: Conf. Ser.

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With the aim of investigating the effect of water depth on the earthquake response of a deep-water cable-stayed bridge tower, this study designed and manufactured a large-scale bridge tower model, taking a cable-stayed bridge across a deep reservoir of a hydropower station as a reference. Under the boundary conditions similar to the reference, shaking table tests were conducted to reflect the structural response of the bridge tower under white noise and earthquake actions at different water depths. The time history curve of the bridge tower’s structural response was recorded and used to investigate the variations in the natural frequency, displacement, stress and strain of a deep-water cable-stayed bridge tower at different water depths under earthquake actions. The results showed that the natural frequency of the bridge tower decreased almost linearly with the increase in the water depth. The displacement at the tower top increased gradually with the increase in the water depth under earthquake actions. In addition, the stress and strain at the tower bottom increased almost linearly in the transverse direction and nonlinearly in the longitudinal direction with the increase in the water depth.

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Section: Introductionmentioning

confidence: 86%

Experimental Study on Effect of Water Depth on Earthquake Response of a Deep-water Cable-stayed Bridge Tower

Geng

Leng

et al. 2023

J. Phys.: Conf. Ser.

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“…To study the elastic dynamic response of bridge piers in water under unidirectional horizontal ground motions, Lai 37 adopted the increased scale factor for the acceleration ( S a = 3) and polymethyl methacrylate (PMMA) with substantially lower elastic modulus ( S E = 1/10) as the model material but kept the scale factor for the density of the structure constant ( S ρ,s = 1) by adding additional mass, to satisfy both the elasticity similitude criterion (i.e., S l = S E / S ρ,s S a ) and the same scale factor of hydrodynamic force ( S H ) with other forces ( S F ). To study the structural behavior of the South Tower of the Nanjing 3rd Yangtze River Bridge, Song et al 17,39,40 and Li et al 41 designed a scaled ( S l = 1/50) model by using steel tubes to mimic the reinforced concrete (RC) bridge piers in the prototype, but the scaled modeling procedure did not follow exactly any existing similitude criteria. Huang 42 designed a scaled ( S l = 1/50) pier model in compliance with the elasticity–gravity similitude criterion (i.e., S l = S E / S ρ,s and S a = 1) by employing rubber with S ρ,s = 1 and S E = 1/50 as the model material.…”

Section: Ust Model Tests On Cylindrical Marine Structuresmentioning

confidence: 99%

Strategy of scaled modeling for underwater shaking table tests on cylindrical marine structures under coupled earthquake and wave–current action: A review

Han,

Li,

Wang

et al. 2023

Earthquake Engineering and Resilience

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Marine structures located in earthquake‐prone areas may be subjected to coupled earthquake and wave–current action and the underwater shaking table (UST) model test is one of the most effective methods to investigate the dynamic responses of them. However, the strategy of scaled modeling, including the selection of similitude criterion and the implementation of it, plays an important role in the test design, and hence influences the accuracy of response predictions of the prototype. This paper presents a comprehensive review of the strategy of scaled modeling utilized in UST model tests on marine structures subjected to coupled earthquake and wave–current action. The key performance parameters of USTs in service and being built in the world are first introduced. Then, the strategies of scaled modeling adopted in existing UST model tests of bridges, offshore wind turbines, submarine pipelines, and submerged floating tunnels are summarized. Following this, the applicability of current similitude criteria for UST model tests for different research focuses is fully discussed and the specific measure to realize the similitude criteria is concluded. Finally, recommendations for future work on similitude criteria are set out, providing insights into the improvements of the applicability and accuracy of the similitude criteria for UST model tests.

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“…Then, formula (4) can be rewritten as: is the additional hydrodynamic mass of the underwater structure. Next, formula (5) can be sorted out as: (6) where, M, C and K are the matrices of structural mass, damping and stiffness, respectively. As shown in formula (6), the structural impact of hydrodynamic pressure can be considered as the additional hydrodynamic mass that moves together with the structure.…”

Section: Analysis Of Structural Motions Based On Morison Equationmentioning

confidence: 99%

“…Next, formula (5) can be sorted out as: (6) where, M, C and K are the matrices of structural mass, damping and stiffness, respectively. As shown in formula (6), the structural impact of hydrodynamic pressure can be considered as the additional hydrodynamic mass that moves together with the structure. The coefficient of hydrodynamic inertia force CM depends on the shape of the structure.…”

Section: Analysis Of Structural Motions Based On Morison Equationmentioning

confidence: 99%

“…The piers of a cross-sea bridge are subject to the joint excitation of various loads induced by earthquake, wind and waves [1][2][3]. However, China has not yet acquired enough theoretical knowledge and empirical data about cross-sea bridges [4][5][6]. Therefore, it is of great engineering significance to develop a vibration control technique that suits cross-sea bridges.…”

Section: Introductionmentioning

confidence: 99%

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Semi-active Control of Continuous Girder Bridges Considering the Coupling Effect of Earthquake and Hydrodynamic Pressure

Ma¹,

Wang²

2019

IJHT

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Under the action of earthquakes, the dynamic responses of cross-sea bridges are greatly influenced by the dynamic interaction between each pier and the surrounding water. Based on Morison equation, this paper mainly explores the responses of a continuous girder cross-sea bridge in uncontrolled and semi-active control modes, under the combined effect of earthquake and hydrodynamic pressure. First, a simplified two-degree-of-freedom (2DOF) analysis model was constructed for the bridge: the combined stiffness was proposed to reflect the effects of the bending and shear deformation features of the pier; the pier mass was aggregated on the top of the pier as the additional pier mass, using the shape function of linear deformation; the hydrodynamic pressure distributed on the pier was calculated by the Morison equation, converted into the equivalent node load on the top of the pier, and further transformed into the additional hydrodynamic mass. Then, a magnetorheological (MR) damper was added between the pier and the girder. The semi-active algorithm of the MR damper was designed based on the clipped-optimal control algorithm. The control force of the MR damper was optimized by the H2/LQG active control method. The results show that the hydrodynamic pressure changes the dynamic features of the bridge and increases the seismic responses of the bridge, calling for a stronger control force for semi-active control; the impact of hydrodynamic pressure must be considered in the seismic design of cross-sea bridges; the MR semi-active control can effectively suppress the dynamic responses of cross-sea bridges, enhancing the seismic safety of the bridge. The research results provide new insights into the vibration control of cross-sea bridges.

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Experiment and Calculation Method of the Dynamic Response of Deep Water Bridge in Earthquake

Cited by 13 publications

References 10 publications

Experimental Study on Effect of Water Depth on Earthquake Response of a Deep-water Cable-stayed Bridge Tower

Experimental Study on Effect of Water Depth on Earthquake Response of a Deep-water Cable-stayed Bridge Tower

Strategy of scaled modeling for underwater shaking table tests on cylindrical marine structures under coupled earthquake and wave–current action: A review

Semi-active Control of Continuous Girder Bridges Considering the Coupling Effect of Earthquake and Hydrodynamic Pressure

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