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Seismic analysis of dam-foundation-reservoir system including the effects of foundation mass and radiation damping

Mohammadnezhad, H ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1007/s11803-019-0499-4
  3. Publisher: Institute of Engineering Mechanics (IEM) , 2019
  4. Abstract:
  5. One of the main concerns in using commercial software for finite element analyses of dam-foundation-reservoir systems is that the simplifying assumptions of the massless foundation are unreliable. In this study, an appropriate direct finite element method is introduced for simulating the mass, radiation damping and wave propagation effect in foundations of dam-foundation-reservoir systems using commercial software ABAQUS. The free-field boundary condition is used for modeling the semi-infinite foundation and radiation damping, which is not a built-in boundary condition in most of the available commercial software for finite element analysis of structures such as ANSYS or ABAQUS and thus needs to be implemented differently. The different mechanism for modeling of the foundation, earthquake input and far-field boundary condition is described. Implementation of the free-field boundary condition in finite element software is verified by comparing it with analytical results. To investigation the feasibility of the proposed method in dam-foundation-reservoir system analysis, a series of analyses is accomplished in a variety of cases and the obtained results are compared with the substructure method by using the EAGD-84 program. Finally, the massed and massless foundation results are compared and it is concluded that the massless foundation approach leads to the overestimation of the displacements and stresses within the dam body. © 2019, Institute of Engineering Mechanics, China Earthquake Administration and Springer-Verlag GmbH Germany, part of Springer Nature
  6. Keywords:
  7. Dam-foundation interaction ; Free-field boundary condition ; Massed foundation ; ABAQUS ; Boundary conditions ; Damping ; Dams ; Foundations ; Radiation effects ; Reservoirs (water) ; Synchrotron radiation ; Wave propagation ; Dam foundation ; Different mechanisms ; Displacements and stress ; Finite element software ; Free fields ; Radiation damping ; Semi-infinite foundation ; Simplifying assumptions ; Finite element method
  8. Source: Earthquake Engineering and Engineering Vibration ; Volume 18, Issue 1 , 2019 , Pages 203-218 ; 16713664 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s11803-019-0499-4