Comparison between Strain-Based vs. Stress-Based Criteria in Seismic Performance Evaluation of High Arch Dams
Masood Heshmati,
Seyed Mohammad Seyed Kolbadi,
Seyed Mahdi Seyed Kolbadi
Issue:
Volume 3, Issue 2-1, March 2015
Pages:
1-8
Received:
24 October 2014
Accepted:
30 October 2014
Published:
12 November 2014
Abstract: In the present paper, seismic performance of a high concrete arch dam is evaluated based on both the stress and strain criteria. For this purpose, the finite element model of the selected arch dam-reservoir-foundation system was provided. Reservoir was modeled using Eulerian approach as a compressible domain and the foundation rock was assumed to be mass-less. Dynamic equilibrium equations for the coupled system were solved using Newmark’s time integration algorithm. Seismic performance evaluation of dam-foundation-reservoir systems were performed considering parameters such as demand-capacity ratio, cumulative inelastic duration and extension of overstressed (or overstrained) areas obtained from linear elastic analyses and compared with the real crack profile from nonlinear analysis. It was found that although results obtained for the stress and strain rules have similarities, performance evaluation based on the strain gives different results which can be lead to different decision making in dam safety related projects.
Abstract: In the present paper, seismic performance of a high concrete arch dam is evaluated based on both the stress and strain criteria. For this purpose, the finite element model of the selected arch dam-reservoir-foundation system was provided. Reservoir was modeled using Eulerian approach as a compressible domain and the foundation rock was assumed to b...
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Effect of Ground Motions on Nonlinear Seismic Behavior of Corroded Buried Gas Pipeline
S. Mohammad S. Kolbadi,
Nemat Hassani,
S. Mahdi S. Kolbadi,
M. R. Shiravand
Issue:
Volume 3, Issue 2-1, March 2015
Pages:
9-13
Received:
3 January 2015
Accepted:
8 January 2015
Published:
14 January 2015
Abstract: Recent earthquakes have damaged many lifeline structures. Buried gas pipelines are also no exceptions. Sometimes, theses pipes are subjected to a thinning of the wall thickness due to corrosion. Therefore, it is important to evaluate the strength of the pipes undergoing local wall thinning to maintain the integrity of the piping systems. The main purpose of this study is to understand failure aspects of buried pipeline caused by earthquake and degradation of metal due to corrosion through FEM. In dynamic analysis, corroded pipeline approaches to critical criteria (reaching the yield stress) in much less time. In this case, if the corroded pipe thickness be half, the yielding angle is reduced to a quarter.
Abstract: Recent earthquakes have damaged many lifeline structures. Buried gas pipelines are also no exceptions. Sometimes, theses pipes are subjected to a thinning of the wall thickness due to corrosion. Therefore, it is important to evaluate the strength of the pipes undergoing local wall thinning to maintain the integrity of the piping systems. The main p...
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