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ISSN : 1026-3098
e-ISSN : 2345-3605
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Publication Information : Volume 21 - Number 4
Type : Article
Topics of Paper : Transaction on Civil Engineering
English Title : Rate-Dependence of Rockfill Behavior on Propagated Near Fault Ground Motions
English Abstract : Equivalent linear one-dimensional site response analysis, which approximates the nonlinear soil behavior within the linear analysis framework, is widely used in estimating local site effects. In this analysis, soil behavior is often assumed to be independent of the frequency of seismic loading. However, the large scale triaxial test results on rockfill material have shown that the shear modulus, and especially the damping ratio, are influenced by the loading frequency. A series of one-dimensional equivalent linear analyses were performed on 30m and 90m thick profiles of the studied rockfill material to evaluate the frequency-dependent soil behavior under several well-known near-fault ground motions. The analyses are carried out for three base acceleration levels, namely, 0.1 g, 0.35 g, and 1 g, using the simple time history scaling method. Results show that the frequency-dependent shear modulus and damping ratio can have a pronounced influence on propagated ground motions. The frequency-dependent soil behavior is also dependent on the thickness of soil profile,amplitude, equivalent no. of cycles at 0.65τmax, and frequency content of the input ground motion.
English Keywords : Triaxial, rockfill, frequency, modulus, damping, spectra
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Number Of Pages :
From 1263 to 1280


Authors :
The AuthorAuthor SequenceOrganizationOrganization ( english )AffiliationEmailEducation
Dr. Hamid-Reza Razeghi
(Author)
1School of Civil Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran, P.O. Box 16765-163, Iran  razeghi@iust.ac.irAssistant Professor
Dr. Ata Aghaei Araei 2Head of Geotechnical Engineering Lab., Road, Housing and Urban Development Research Center (BHRC), Tehran, P.O. Box:13145-1696, Iran  aghaeiaraei@bhrc.ac.irAssistant professor
Dr. Abbas Ghalandarzadeh 3School of Civil Engineering, College of Engineering, University of Tehran, P.O. Box 11365-4563, Iran  aghaland@ut.ac.irAssociated Professor
Dr. Saeid Hashemi Tabatabaei 4Department of Geotechnical Engineering, Road, Housing and Urban Development (BHRC), Tehran, P.O. Box:13145-1696, Iran  htabatabaei@bhrc.ac.irAssistant professor
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