Challenges of high dam construction to computational mechanics

Zhang, Chuhan

doi:10.1007/s11709-007-0002-6

Cited by 8 publications

(3 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, for the sand soil sample, the corresponding pre-consolidation pressure can only be accurately determined at high stress levels 15 . To predict the mechanical properties of sand soils, Jefferies 35 and Zhang 47,50 proposed an approximation method that can be used under the conditions of known the current void ratio and state parameters (such as mean stress). As shown in Fig.…”

Section: Model Predictions For Sandsmentioning

confidence: 99%

An implicit integration algorithm for implementing the CASM model into the finite difference method analysis

Cui

2023

Preprint

View full text Add to dashboard Cite

This paper firstly presents an implementation of the unified critical state model for CLAY and SAND, i.e., CASM, into the finite difference method analysis platform FLAC3D, via the user defined constitutive models (UDM). The numerical implementation is performed with an implicit integration algorithm, and validation is conducted through a series of triaxial drained and undrained compression tests on normally consolidated clay, over-consolidated clay and sand. Application to an embankment loading is analyzed to demonstrate the efficiency and reliability of the proposed implementation of CASM model. Conclusions can be drawn that the algorithm exhibits high computational accuracy and efficiency, and has the ability to reasonably predict the stress-strain relationship of soil samples with varying consolidation degrees. Additionally, applications of the CASM model to geotechnical problems are widely expected for that the FLAC3D is better in dealing with convergence problems.

show abstract

Section: Model Predictions For Sandsmentioning

confidence: 99%

An implicit integration algorithm for implementing the CASM model into the finite difference method analysis

Cui

2023

Preprint

View full text Add to dashboard Cite

show abstract

“…There have already been several cases of concrete dams being damaged by seismic loads, threatening the security of concrete dams. [4][5][6][7] Therefore, the damage identification of concrete arch dams is important for understanding their operation state, promoting project benefits, and ensuring their safe operation. As one part of Structural Health Monitoring, the goal of damage identification is to detect, localize, and quantify the structural damage of concrete dams due to earthquakes in this study.…”

Section: Introductionmentioning

confidence: 99%

Online structural damage state identification of concrete arch dams under dynamic loads using a recursive TVARX approach

Qiu

Zheng

et al. 2022

Structural Health Monitoring

View full text Add to dashboard Cite

Concrete arch dams have been widely constructed worldwide, and many of these dams are located in areas with high seismic activity. However, strong seismic loading poses a severe threat to concrete arch dams, and dams have the risk of suffering damage and the possibility of an ensuing dam break. In past decades, seismic and structural health monitoring has undergone rapid growth in the context of arch dams to track the operation state of arch dams under strong seismic loading. In fact, arch dams with damage caused by seismic loading normally exhibit nonlinear dynamic behaviors and time-variable dynamic properties. To effectively identify the structural damage state development of arch dams under seismic loading, an online damage identification method using a novel recursive time-variable autoregressive with exogenous (TVARX) input model was presented in this paper. To improve the tracking capability for the time-variable coefficients of the TVARX model, an adaptive adjustment algorithm of variable weighting factors was incorporated into the recursive least-squares method. In the proposed method, the predicted model residual, a damage index named the fit ratio (FR), the difference between fit ratios (DF), and a damage index based on the change in ARX model parameters (CH) were proposed to identify the presence of damage, damage area, and relative damage extent for arch dams. Eventually, the proposed approach was used for the online damage state identification of arch dams in a numerical simulation example and a shaking table test, and the identification results demonstrated the effectiveness of the proposed approach.

show abstract

“…In current design practice, the linear elastic theory is commonly used for earthquake resistance design of arch dams and the criteria of maximum principal stresses are adopted to evaluate safety factors of dams [1] , where the nonlinear behavior of contraction joint opening and damage-cracking of the material are ignored. However, as a quasi-brittle material, concrete behaves as linear elastic only when it is subjected to limited normal loads, while damage-cracking will occur when the tensile stresses exceed the concrete strength during strong earthquakes.…”

Section: Introductionmentioning

confidence: 99%

Seismic damage-cracking analysis of arch dams using different earthquake input mechanisms

Pan

Zhang

Wang

et al. 2008

Sci. China Ser. E-Technol. Sci.

Self Cite

View full text Add to dashboard Cite

In this study, a nonlinear model is presented for analysis of damage-cracking behavior in arch dams during strong earthquakes using different seismic input mechanisms. The nonlinear system includes a plastic-damage model for cyclic loading of concrete considering strain softening and a contact boundary model of contraction joint opening. Two different earthquake input mechanisms are used for comparison, including massless foundation input model and viscous-spring boundary model considering radiation damping due to infinite canyon. The results demonstrate that effects of seismic input mechanism and radiation damping on nonlinear response and damage-cracking of the dam are significant. Compared with the results of using massless foundation input model, the damage-cracking region and contraction joint opening are substantially reduced when using viscous-spring boundary model to take into account radiation damping. However, if the damping ratio of the dam is artificially increased to about 10%-15% for massless foundation input model, the joint opening and damage-cracking of the dam are comparable to the results obtained from the viscous-spring boundary model. earthquake input mechanism,

show abstract

Challenges of high dam construction to computational mechanics

Cited by 8 publications

References 30 publications

An implicit integration algorithm for implementing the CASM model into the finite difference method analysis

An implicit integration algorithm for implementing the CASM model into the finite difference method analysis

Online structural damage state identification of concrete arch dams under dynamic loads using a recursive TVARX approach

Seismic damage-cracking analysis of arch dams using different earthquake input mechanisms

Contact Info

Product

Resources

About