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Evaluation of the pseudostatic analyses of earth dams using Fe simulation and observed earthquake-induced deformations: case studies of Upper San Fernando and Kitayama dams.

Akhlaghi T, Nikkar A - ScientificWorldJournal (2014)

Bottom Line: Dynamic analyses were conducted to simulate the earthquake-induced deformations of the dams using the computer program Plaxis code.Then the pseudostatic seismic coefficient used in the design and analyses of the dams were compared with the seismic coefficients obtained from dynamic analyses of the simulated model as well as the other available proposed pseudostatic correlations.Based on the comparisons made, the accuracy and reliability of the pseudostatic seismic coefficients are evaluated and discussed.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Civil Engineering, University of Tabriz, Tabriz 5166116471, Iran.

ABSTRACT
Evaluation of the accuracy of the pseudostatic approach is governed by the accuracy with which the simple pseudostatic inertial forces represent the complex dynamic inertial forces that actually exist in an earthquake. In this study, the Upper San Fernando and Kitayama earth dams, which have been designed using the pseudostatic approach and damaged during the 1971 San Fernando and 1995 Kobe earthquakes, were investigated and analyzed. The finite element models of the dams were prepared based on the detailed available data and results of in situ and laboratory material tests. Dynamic analyses were conducted to simulate the earthquake-induced deformations of the dams using the computer program Plaxis code. Then the pseudostatic seismic coefficient used in the design and analyses of the dams were compared with the seismic coefficients obtained from dynamic analyses of the simulated model as well as the other available proposed pseudostatic correlations. Based on the comparisons made, the accuracy and reliability of the pseudostatic seismic coefficients are evaluated and discussed.

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The sliding failure zone in Kitayama dam caused by Kobe 1995 earthquake.
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fig2: The sliding failure zone in Kitayama dam caused by Kobe 1995 earthquake.

Mentions: The Kobe earthquake of January 17, 1995, in Japan caused slides on the upstream slope of the Kitayama dam which is an earth dam located about 33 kilometers northeast of the epicenter. It was minor damage that did not affect the structural safety and the water storage functions of the dam. But this was the first time that an embankment dam designed based on design standards and filled by the engineered rolling compaction was damaged in this way in Japan. The sliding failure zone with a depth of 1.5 to 2 m was confirmed and the length in the dam axis direction of the sliding was about 100 m (Figure 2).


Evaluation of the pseudostatic analyses of earth dams using Fe simulation and observed earthquake-induced deformations: case studies of Upper San Fernando and Kitayama dams.

Akhlaghi T, Nikkar A - ScientificWorldJournal (2014)

The sliding failure zone in Kitayama dam caused by Kobe 1995 earthquake.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3927942&req=5

fig2: The sliding failure zone in Kitayama dam caused by Kobe 1995 earthquake.
Mentions: The Kobe earthquake of January 17, 1995, in Japan caused slides on the upstream slope of the Kitayama dam which is an earth dam located about 33 kilometers northeast of the epicenter. It was minor damage that did not affect the structural safety and the water storage functions of the dam. But this was the first time that an embankment dam designed based on design standards and filled by the engineered rolling compaction was damaged in this way in Japan. The sliding failure zone with a depth of 1.5 to 2 m was confirmed and the length in the dam axis direction of the sliding was about 100 m (Figure 2).

Bottom Line: Dynamic analyses were conducted to simulate the earthquake-induced deformations of the dams using the computer program Plaxis code.Then the pseudostatic seismic coefficient used in the design and analyses of the dams were compared with the seismic coefficients obtained from dynamic analyses of the simulated model as well as the other available proposed pseudostatic correlations.Based on the comparisons made, the accuracy and reliability of the pseudostatic seismic coefficients are evaluated and discussed.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Civil Engineering, University of Tabriz, Tabriz 5166116471, Iran.

ABSTRACT
Evaluation of the accuracy of the pseudostatic approach is governed by the accuracy with which the simple pseudostatic inertial forces represent the complex dynamic inertial forces that actually exist in an earthquake. In this study, the Upper San Fernando and Kitayama earth dams, which have been designed using the pseudostatic approach and damaged during the 1971 San Fernando and 1995 Kobe earthquakes, were investigated and analyzed. The finite element models of the dams were prepared based on the detailed available data and results of in situ and laboratory material tests. Dynamic analyses were conducted to simulate the earthquake-induced deformations of the dams using the computer program Plaxis code. Then the pseudostatic seismic coefficient used in the design and analyses of the dams were compared with the seismic coefficients obtained from dynamic analyses of the simulated model as well as the other available proposed pseudostatic correlations. Based on the comparisons made, the accuracy and reliability of the pseudostatic seismic coefficients are evaluated and discussed.

Show MeSH
Related in: MedlinePlus