TY - JOUR ID - 1721 TI - Rate-Dependence of Rockfill Behavior on Propagated Near Fault Ground Motions JO - Scientia Iranica JA - SCI LA - en SN - 1026-3098 AU - Razeghi, Hamid-Reza AU - Aghaei Araei, Ata AU - Ghalandarzadeh, Abbas AU - Hashemi Tabatabaei, Saeid AD - School of Civil Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran, P.O. Box 16765-163, Iran AD - Head of Geotechnical Engineering Lab., Road, Housing and Urban Development Research Center (BHRC), Tehran, P.O. Box:13145-1696, Iran AD - School of Civil Engineering, College of Engineering, University of Tehran, P.O. Box 11365-4563, Iran AD - Department of Geotechnical Engineering, Road, Housing and Urban Development (BHRC), Tehran, P.O. Box:13145-1696, Iran Y1 - 2014 PY - 2014 VL - 21 IS - 4 SP - 1263 EP - 1280 KW - triaxial KW - rockfill KW - frequency KW - modulus KW - damping KW - spectra DO - N2 - 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 0.65Ď„max, and frequency content of the input ground motion. UR - https://scientiairanica.sharif.edu/article_1721.html L1 - https://scientiairanica.sharif.edu/article_1721_dbb4e42e4ed1a00a302ee03d72ac687d.pdf ER -