Seismic safety of arch dams with aging effects

Wang, Jinting; Feng, Jian; Zhang, Chuhan

doi:10.1007/s11431-010-4279-7

Cited by 20 publications

(4 citation statements)

References 24 publications

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“…(1) are quite suitable for the simulation of the behaviors of contraction joints and have been justified in refs. [11][12][13]20].…”

Section: Modeling Of Contraction Joints With Shear Keysmentioning

confidence: 99%

“…However, these researchers both ignored the effects of shear keys on the seismic responses of arch dams. In Zhang et al's subsequent studies [11][12][13], in order to represent the shear key action, linear springs between the contact surface pairs were introduced to constrain the tangential relative displacement, but the shear sliding was neglected.…”

Section: Introductionmentioning

confidence: 99%

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Effects of shear keys on nonlinear seismic responses of an arch-gravity dam

Jiang

Ju-wei³

2011

Sci. China Technol. Sci.

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In the paper, the added tangential nonlinear springs are introduced to represent the effects of one-way and two-way shear keys. The added tangential stiffness coefficient is relative to the joint opening and the relative tangential movement and determined numerically by using a refined model of shear keys. The user subroutine of nonlinear spring elements has been implemented into ABAQUS program. The seismic responses of an arch-gravity dam are mainly examined. It is shown by the results that a significant increase of about 17%-30% in joint opening can be observed for the dam with one-way shear keys; the two-way shear keys are beneficial to restrain the sliding displacement along both the radial and vertical directions, whereas the one-way shear keys mainly restrain the displacement along the radial direction; for the dam with shear keys, the maximum arch stress is increased, the cantilever stress is reduced, and the location of the maximum cantilever stress is also moved from the dam heel to the midheight of the cantilever. seismic responses, arch-gravity dam, contraction joints, shear keys, nonlinear spring elements Citation:Jiang S Y, Du C B, Yuan J W. Effects of shear keys on nonlinear seismic responses of an arch-gravity dam.

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“…(1) are quite suitable for the simulation of the behaviors of contraction joints and have been justified in refs. [11][12][13]20].…”

Section: Modeling Of Contraction Joints With Shear Keysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of shear keys on nonlinear seismic responses of an arch-gravity dam

Jiang

Ju-wei³

2011

Sci. China Technol. Sci.

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“…As one essential component of society's infrastructure system, concrete arch dams play the roles of flood control, power Sensors 2024, 24, 3845 2 of 24 generation, irrigation, shipping, and water supply. Many of these existing arch dams are located in seismically active regions, and their seismic safety has been one of the crucial issues in the design and construction stages for researchers because of potential damage or failure that threatens public safety and economic infrastructure [4,5]. Several instances of dam damage sustained due to strong earthquakes have been recorded, including in the Hsinfengkiang concrete dam [6] in China, the Koyna gravity dam [7] in India, and the Pacoima arch dam [8] in the USA.…”

Section: Introductionmentioning

confidence: 99%

Modal Parameter Recursive Estimation of Concrete Arch Dams under Seismic Loading Using an Adaptive Recursive Subspace Method

Zhu,

Qiu,

et al. 2024

Sensors

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Modal parameter estimation is crucial in vibration-based damage detection and deserves increased attention and investigation. Concrete arch dams are prone to damage during severe seismic events, leading to alterations in their structural dynamic characteristics and modal parameters, which exhibit specific time-varying properties. This highlights the significance of investigating the evolution of their modal parameters and ensuring their accurate identification. To effectively accomplish the recursive estimation of modal parameters for arch dams, an adaptive recursive subspace (ARS) method with variable forgetting factors was proposed in this study. In the ARS method, the variable forgetting factors were adaptively updated by assessing the change rate of the spatial Euclidean distance of adjacent modal frequency identification values. A numerical simulation of a concrete arch dam under seismic loading was conducted by using ABAQUS software, in which a concrete damaged plasticity (CDP) model was used to simulate the dam body’s constitutive relation, allowing for the assessment of damage development under seismic loading. Utilizing the dynamic responses obtained from the numerical simulation, the ARS method was implemented for the modal parameter recursive estimation of the arch dam. The identification results revealed a decreasing trend in the frequencies of the four initial modes of the arch dam: from an undamaged state characterized by frequencies of 0.910, 1.166, 1.871, and 2.161 Hz to values of 0.895, 1.134, 1.842, and 2.134 Hz, respectively. Concurrently, increases in the damping ratios of these modes were observed, transitioning from 4.44%, 4.28%, 5.42%, and 5.56% to 4.98%, 4.91%, 6.61%, and 6.85%%, respectively. The correlation of the identification results with damage progression validated the effectiveness of the ARS method. This study’s outcomes have substantial theoretical and practical importance, facilitating the immediate comprehension of the dynamic characteristics and operational states of concrete arch dam structures.

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“…Relevant material deterioration models and structural safety and reliability evaluation models of arch dams are not studied and established. Wang et al introduced a concrete degradation model with aging because of chemo-mechanical damage and studied the seismic response of an arch dam with aging effects 12 . Pan et al proposed a unified approach for long-term behavior and seismic response analysis of AAR (alkali-aggregate reaction) -affected concrete dams by combining AAR kinetics, effects of creep and plastic-damage model in the finite element method 13 .…”

Section: Introductionmentioning

confidence: 99%

Study on the freeze–thaw effect on concrete arch dam using an improved response surface method

Cai,

Yang,

Yang

2023

Sci Rep

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The damming materials will be deteriorated during the long-term service of concrete arch dam by weathering, seepage dissolution, freeze–thaw and other factors which will put dams at potential risk. However, there are few researches on the reliability assessment of arch dams considering the effect of material deterioration. In this paper, a prediction model of concrete mechanical properties under freeze–thaw cycles is established using regression analysis. Considering various uncertain factors, a time-varying structural reliability analysis model is established using finite element equivalent stress method and an optimized response surface method with improved sampling strategy and convergence criterion. A case study is later carried out. The results show that, at the early stage of freeze–thaw, the structural failure probability will increase steadily in a small range. However, as the tensile strength of concrete continues to decrease under long-time freeze–thaw action, the reliability of the arch dam structure will suddenly fall off a cliff. The proposed deterioration model and reliability analysis probability model are reasonable and practical and could be serve as a technical support for similar engineering projects.

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Seismic safety of arch dams with aging effects

Cited by 20 publications

References 24 publications

Effects of shear keys on nonlinear seismic responses of an arch-gravity dam

Effects of shear keys on nonlinear seismic responses of an arch-gravity dam

Modal Parameter Recursive Estimation of Concrete Arch Dams under Seismic Loading Using an Adaptive Recursive Subspace Method

Study on the freeze–thaw effect on concrete arch dam using an improved response surface method

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