Influences on the Seismic Response of the Gravity Dam‐Foundation‐Reservoir System with Different Boundary and Input Models

Chen, Denghong; Hou, Chunping; Wang, Feng

doi:10.1155/2021/6660145

Cited by 6 publications

(5 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Salamon et al [4] compared the seismic responses of the Pine Flat dam under free-field boundary and non-reflection boundary conditions, and the results showed that the free-field boundary condition was essential to obtain realistic ground motions. Chen et al [20] investigated the influences of two boundary conditions (the viscous-spring boundary and the viscous boundary) in their earthquake input models on the seismic analysis of the Pine Flat and Jin'anqiao gravity dam-foundation-reservoir systems, and the results revealed that the agreement between the two boundary conditions was good. Wang et al [21] investigated the seismic damage development and potential failure pattern of the 142 m high Guandi concrete gravity dam using incremental dynamic analysis (IDA), in which the massless foundation model was used to simulate the damfoundation dynamic interaction, and the truncation boundary of the foundation was set to 1.5 times the dam height in the upstream and downstream directions, and 2 times the dam height in the depth direction.…”

Section: Introductionmentioning

confidence: 99%

Influences on the Seismic Response of a Gravity Dam with Different Foundation and Reservoir Modeling Assumptions

Wang

Zhang²,

Zhang

et al. 2021

Water

View full text Add to dashboard Cite

The seismic design and dynamic analysis of high concrete gravity dams is a challenge due to the dams’ high levels of designed seismic intensity, dam height, and water pressure. In this study, the rigid, massless, and viscoelastic artificial boundary foundation models were established to consider the effect of dam–foundation dynamic interaction on the dynamic responses of the dam. Three reservoir water simulation methods, namely, the Westergaard added mass method, and incompressible and compressible potential fluid methods, were used to account for the effect of hydrodynamic pressure on the dynamic characteristics and seismic responses of the dam. The ranges of the truncation boundary of the foundation and reservoir in numerical analysis were further investigated. The research results showed that the viscoelastic artificial boundary foundation was more efficient than the massless foundation in the simulation of the radiation damping effect of the far-field foundation. It was found that a foundation size of 3 times the dam height was the most reasonable range of the truncation boundary of the foundation. The dynamic interaction of the reservoir foundation had a significant influence on the dam stress.

show abstract

Section: Introductionmentioning

confidence: 99%

Influences on the Seismic Response of a Gravity Dam with Different Foundation and Reservoir Modeling Assumptions

Wang

Zhang²,

Zhang

et al. 2021

Water

View full text Add to dashboard Cite

show abstract

“…is is because for two-dimensional models, the free-field system is a one-dimensional column for both the direct FE method and the analytical method. e analytical method has been used for linear two-dimensional modelling of concrete gravity dams, e.g., by Enzell et al [48] and Chen et al [49].…”

Section: Influence Of the Free-field Modelling Of The Foundation On The Computed Response Of The Dammentioning

confidence: 99%

Nonlinear Behaviour of Concrete Buttress Dams under High‐Frequency Excitations Taking into Account Topographical Amplifications

Abbasiverki

Malm

Ansell

et al. 2021

Shock and Vibration

View full text Add to dashboard Cite

Concrete buttress dams could potentially be susceptible to high-frequency vibrations, especially in the cross-stream direction, due to their slender design. Previous studies have mainly focused on low-frequency vibrations in stream direction using a simplified foundation model with the massless method, which does not consider topographic amplifications. This paper therefore investigates the nonlinear behaviour of concrete buttress dams subjected to high-frequency excitations, considering cross-stream vibrations. For comparison, the effect of low-frequency excitations is also investigated. The influence of the irregular topography of the foundation surface on the amplification of seismic waves at the foundation surface and thus in the dam is considered by a rigorous method based on the domain-reduction method using the direct finite element method. The sensitivity of the calculated response of the dam to the free-field modelling approach is investigated by comparing the result with analyses using an analytical method based on one-dimensional wave propagation theory and a massless approach. Available deconvolution software is based on the one-dimensional shear wave propagation to transform the earthquake motion from the foundation surface to the corresponding input motion at depth. Here, a new deconvolution method for both shear and pressure wave propagation is developed based on an iterative time-domain procedure using a one-dimensional finite element column. The examples presented showed that topographic amplifications of high-frequency excitations have a significant impact on the response of this type of dam. Cross-stream vibrations reduced the safety of the dam due to the opening of the joints and the increasing stresses. The foundation modelling approach had a significant impact on the calculated response of the dam. The massless method produced unreliable results, especially for high-frequency excitations. The free-field modelling with the analytical method led to unreliable joint openings. It is therefore recommended to use an accurate approach for foundation modelling, especially in cases where nonlinearity is considered.

show abstract

“…In the design and safety analysis of the dam structures, the dynamic dam-foundation interaction is crucial. Numerous computational techniques, such as rigid, massless, and massed foundation models, have been employed to investigate the dynamic dam-foundation interaction [5,10,16,18,20,21]. Using large foundation models is not necessary, A massless foundation model, in which only the impacts of foundation flexibility are taken into account, was put forth by Clough et al in the 1970s [7].…”

Section: Introductionmentioning

confidence: 99%

Effect of Dam–Rock Foundation Interaction Modeling on the Modal Ratio-Related Quantity of Beni Behdel and ‘El Mefrouch Multi-Arch Dams

Berrabah,

Attia,

Habib

et al. 2023

Acta Mechanica Et Automatica

View full text Add to dashboard Cite

Using the Beni Behdel dam and the El Mefrouch dam as example studies, this paper intends to clearly demonstrate how modeling of the interactions between rock foundations and dams impacts the modal behavior of these two multi-arch dams. The uniqueness of this study is that the modal behavior of each dam is represented in terms of related parameters (period, participation factor, ratio, and effective mass), and more precisely in terms of ratio (defined as the ratio between the participation factor of the mode i and the maximum participation factor), as opposed to other works that have expressed this behavior in terms of frequency. In this article, stiff rock foundation, massless rock foundation, and massed rock foundation are the three methods used to simulate dynamic interactions. The investigated dams are three-dimensionally simulated using the ANSYS finite elements code. The modeling of the rock foundation–dam interaction has an effect on the fundamental mode value, its location, and the related parameters, according to the results. Furthermore, it is found that the upstream–downstream direction is not always the most important direction for dams and that interaction modeling influences the resonance bandwidth, which affects the forecast of the resonance phenomenon.

show abstract

Influences on the Seismic Response of the Gravity Dam‐Foundation‐Reservoir System with Different Boundary and Input Models

Cited by 6 publications

References 41 publications

Influences on the Seismic Response of a Gravity Dam with Different Foundation and Reservoir Modeling Assumptions

Influences on the Seismic Response of a Gravity Dam with Different Foundation and Reservoir Modeling Assumptions

Nonlinear Behaviour of Concrete Buttress Dams under High‐Frequency Excitations Taking into Account Topographical Amplifications

Effect of Dam–Rock Foundation Interaction Modeling on the Modal Ratio-Related Quantity of Beni Behdel and ‘El Mefrouch Multi-Arch Dams

Contact Info

Product

Resources

About