Underwater shaking table tests on bridge pier under combined earthquake and wave-current action

Ding, Yang; Ma, Rui; Shi, Yundong; Li, Zhongxian

doi:10.1016/j.marstruc.2017.12.004

Cited by 68 publications

(34 citation statements)

References 10 publications

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“…Underwater shaking table was recently proposed, which is deemed to be more suitable to examine fluidstructure interaction and could further expand STST application. Recent studies explored the feasibility of STST using underwater shaking table, including providing a practical similitude law (Li Z. et al, 2018) and applying to piers of a cross-sea bridge (Ding et al, 2018). All these examples show the promise of STST being applied to other engineering systems.…”

Section: Application To Other Engineering Problemsmentioning

confidence: 99%

Advances in Real-Time Hybrid Testing Technology for Shaking Table Substructure Testing

Tian

Shao

Zhou

et al. 2020

Front. Built Environ.

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Shaking table substructure testing (STST) takes the substructure with complex behavior physically tested, with the behavior of the rest structural system being numerically simulated. This substructure testing allows the payload of a shaking table being fully utilized in testing of the most concerned part, thus significantly increases its loading capacity. The key to achieve a successful STST is to coordinate among the substructures, specifically, to satisfy compatibility, equilibrium, and synchronization at the boundary between numerical and experimental substructures. A number of studies have focused on the essential techniques of STST, and several applications have been carried out. Nonetheless, its progress is still in the preliminary stage, because of the limited applications using multi-directional shaking tables on large-scale specimens. This paper reviews a series of STSTs and their associated implementation aspects including hybrid testing frameworks, time integration algorithms, delay compensation methods, shaking table and actuator control schemes and boundary force measurement methods. The key techniques required for a successful test are also stressed, such as the force control of actuators to coordination among the substructures. Finally, challenges for future studies and applications are identified and presented.

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Section: Application To Other Engineering Problemsmentioning

confidence: 99%

Advances in Real-Time Hybrid Testing Technology for Shaking Table Substructure Testing

Tian

Shao

Zhou

et al. 2020

Front. Built Environ.

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“…When the distributed mass of the pier is equivalent to the mass of the pier top, assuming that the deformation of the pier conforms to a parabola, then its deformation function is: The hydrodynamic pressure acts on the bridge pier as distributed load. First, the distributed hydrodynamic pressure on unit pier was converted into the equivalent node load on the pier top; then, to facilitate the use of the simplified Morison equation, the equivalent node load on the pier top was converted into the mass of the additional moving water on the pier top [21].…”

Section: Figure 1 a Simplified Bridge Model With Viscous Dampersmentioning

confidence: 99%

Stochastic Optimization of Continuous Beam Bridge Viscous Damper Considering the Fluid-Solid Coupling Effect and Its Damping Performance

Ma¹,

Tan²,

Wang³

et al. 2020

IJHT

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Under the action of earthquake, the dynamic interaction between the bridge pier and the surrounding water has a great impact on the dynamic response of the bridge structure. With a continuous sea-crossing beam bridge as an example, this paper studied the stochastic optimization of the parameters of nonlinear viscous damper and its damping performance under the fluid-solid coupling effect of waves and piers. In this study, a 2-degree-offreedom bridge analysis model considering the fluid-solid coupling effect was constructed, and a nonlinear viscous damper was set in the model and subject to equivalent linearization according to the equivalent energy consumption criterion. Then on this basis, with minimizing the variance of the displacement of pier top as the target, this study applied the Lyapunov method to optimize the parameters of the damper, and explored its impact on the seismic response of the bridge and the damping performance considering the fluid-solid coupling effect. The research results showed that the fluid-solid coupling effect changed the dynamic characteristics of the bridge and increased its seismic response, and the viscous damper can effectively reduce the seismic response of the sea-crossing bridge and improve its damping performance.

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“…In recent years, pile group foundation has been widely used in cross-sea bridges or brides in deep water due to the structural efficiency, ease of construction, and low cost [1], where most of these foundations have their piles partially or totally submerged in deep water. It should be noted that the dynamic behavior of structures in deep water requires special considerations due to the interaction of water with structure [2][3][4]. e earthquake-induced hydrodynamic force on the structure may increase the structural responses.…”

Section: Introductionmentioning

confidence: 99%

Seismic Fragility Analysis of Bridge Group Pile Foundations considering Fluid-Pile-Soil Interaction

Zhang

Wang

2020

Shock and Vibration

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The cross-sea bridges play an important role to promote the development of regional economy. These bridges located in earthquake-prone areas may be subjected to severe earthquakes during their lifetime. Group pile foundations have been widely used in cross-sea bridges due to their structural efficiency, ease of construction, and low cost. This paper investigates the seismic performance of bridge pile foundation based on the seismic fragility analysis. Based on the analysis platform OpenSees, the three-dimensional finite model of the bridge pile foundation is developed, where the pile-water interaction is replaced by the added mass method, nonlinear p-y, t-z, and q-z elements are used to simulate pile-soil interaction, and the displacement of the surface ground motion due to seismic excitations is applied on all spring supports. The seismic fragility curves of the bridge pile foundation are generated by using the earthquake records recommended by FEMA P695 as input motions. The curvature ductility based fragility curves are obtained using seismic responses for different peak ground accelerations. The effects of pile-water interaction, soil conditions, and different types of ground motions on the bridge pier fragilities are studied and discussed. Seismic fragility of the pier-group pile system shows that Sec C (the bottom section of the pier) is the most vulnerable section in the example fluid-structure-soil interaction (FSSI) system for all four damage LSs. The seismic responses of Sec E (a pile section located at the interface of the soil layer and water layer) are much lower than other sections. The parameter analysis shows that pile-water interaction has slight influence (less than 5%) on the fragility curves of the bridge pier. For the bridge group pile foundations considering the fluid-pile-soil interaction, PNF may induce larger seismic response than far-field (FF) and no-pulse near field (NNF). The bridge pile foundation in stiff soil is most vulnerable to seismic damage than soft condition.

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Underwater shaking table tests on bridge pier under combined earthquake and wave-current action

Cited by 68 publications

References 10 publications

Advances in Real-Time Hybrid Testing Technology for Shaking Table Substructure Testing

Advances in Real-Time Hybrid Testing Technology for Shaking Table Substructure Testing

Stochastic Optimization of Continuous Beam Bridge Viscous Damper Considering the Fluid-Solid Coupling Effect and Its Damping Performance

Seismic Fragility Analysis of Bridge Group Pile Foundations considering Fluid-Pile-Soil Interaction

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