Transient analysis of concrete gravity dam-reservoir systems by Wavenumber-TD approach

Vahid Lotfi, Gerald Zenz

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The Wavenumber approach was initially introduced as an ideal substitute for the rigorous type of analysis which had been the basis of extensive studies in seismic analysis of concrete gravity dams. The former technique is formulated in the context of pure finite element programming, while the latter relies heavily on a two-dimensional semi-infinite fluid element (i.e., hyper-element). Recently, a variation of Wavenumber method was proposed which was referred to as Wavenumber-TD approach. The approximation to the original technique improves its realm of application and allows it to be carried out in time domain as well as frequency domain. In that study, the formulation was examined for harmonic type of excitation which proved to be promising. Herein, this will be evaluated for its real intended application, which is transient analysis of dam-reservoir systems. For this aim, the prepared special purpose finite element program is modified and the analysis of Pine Flat dam is considered as a typical example. Several models are considered with different values of normalized reservoir length. In each case, the reservoir truncation surface is treated by Wavenumber-TD and the extensively utilized Sommerfeld conditions. The dynamic loading considered is the S69E component of Taft earthquake record. Furthermore, two types of reservoir bottom condition of full reflective as well as absorptive, are adopted. Overall, this will allow for a thorough examination and evaluation of Wavenumber-TD approach in regard to its effectiveness.

Original languageEnglish
Pages (from-to)313-326
Number of pages14
JournalSoil Dynamics and Earthquake Engineering
Volume90
DOIs
Publication statusPublished - 1 Nov 2016

Fingerprint

Gravity dams
gravity dam
Concrete dams
gravity
Transient analysis
Dams
Earthquakes
dam
earthquakes
Fluids
Pinus
methodology
earthquake
fluid
analysis

Keywords

  • Absorbing boundary conditions
  • Concrete gravity dams
  • Truncation boundary
  • Wavenumber

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Geotechnical Engineering and Engineering Geology
  • Soil Science

Cite this

Transient analysis of concrete gravity dam-reservoir systems by Wavenumber-TD approach. / Lotfi, Vahid; Zenz, Gerald.

In: Soil Dynamics and Earthquake Engineering, Vol. 90, 01.11.2016, p. 313-326.

Research output: Contribution to journalArticleResearchpeer-review

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