مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Persian Verion
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

video

Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

sound

Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Persian Version

Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View:

451
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Download:

0
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Cites:

Information Journal Paper

Title

Assessment of Seismic Non-linear Behavior of Hill-Type Topographies Subjected to propagating SV Waves

Pages

  15-33

Abstract

 Introduction Generally, topographic effects are mostly introduced by hills, canyons, basins, and slopes. Besides, the topographic features produce significant seismic site-effects and can apply a crucial influence on the severity of building damages and its spatial distribution during earthquakes. Some experience observation such as Tarzana hill in the 1994 Northridge earthquake and the Kushiro Meteorological Observatory in the 1993 Kushiro-Oki earthquake, revealed the effective role of surface topographies such as hill and ridges on the seismic damage on the crest and hillsides. Reviewing the technical literature can deduce that the most studies about the effects of topography and the Amplification patterns are limited to the linear behavior of the medium. However, the use of linear models to estimate Amplification patterns of waves can lead to misleading results than the actual behavior of the soil, especially in the soft soils. The non-linear seismic behavior of the hill topographic features unknown in comparison with other types of topographic irregularities, e. g. basins or alluvial valleys. Hence, in this study, the effects of Non-linear Behavior of the hill type-discussed. In this regard, the trapezoidal-shaped hill has been taken into account for parametric study with four shape ratio (SR=0. 1, 0. 3, 0. 5 and 0. 7). Besides, in order to evaluate the effect of topography geometry, the semi-sine and semi-elliptical shapes of the hills have been studied. The constitutive model used herein is based on non-linear Kinematic Hardening model with Von-Mises failure criterion. Parametric Studies In this research, the finite element method (ABAQUS software) is used to evaluate the Hill-Type Topographies behavior due to the vertically in-plane propagating incident SV Waves. The Hill-Type Topographies has been excited vertically by Ricker-type pulse excitations. In this regard, two center frequencies (fp) of low (i. e. 1. 4 Hz) and high (i. e. 4. 3 Hz) have been considered to cover all frequency responses with a maximum acceleration equal to 0. 3 g. The constitutive model used herein is based on non-linear Kinematic Hardening model, which is suitable for clay materials. The results are presented as horizontal component Amplifications (direct component) or vertical (indirect component). Spectral Amplifications have been defined with respect to the free-field motion, based on the maximum Fourier amplitude of the horizontal or vertical component, to the maximum Fourier amplitude of the Free-field motion. In this research, the horizontal and vertical component Amplifications are shown, with AH and AV-Moreover, the obtained results provided for the dimensionless distance (X/L) in which X is points from the center of the hill and L is half the width of the hill. All results have been compared in two linear and non-linear soil behaviors. Concluding Remarks The obtained results indicated that considering the non-linear soil behavior can reduce seismic response of topographic effects in comparison with linear behavior. Furthermore, the maximum Amplification appears on the crest of the hill in both linear and Non-linear Behaviors. The non-linear Amplification values reduced about 15 percent at the Extended Abstracts سال پنجم, شماره دوم, تابستان 9317 lower frequencies for the trapezoidal-shaped hill with shape ratio (SR) of 0. 7 compared with linear behavior. The seismic response of topographic irregularities tends towards free-field ground motion with far from surrounding hills. Besides, in this research the PGA values versus depth and the impedance ratio between inside of hill and its base materials have been studied. The results of this research can be used in seismic hazard and microzonation studies of various urban areas and to point out this the hills with softer materials than the bed, where soil behavior can be non-linear and using linear models, can lead to misleading results than the actual behavior of the soil.

Cites

  • No record.

    • References

  • No record.

    • Cite

    APA: Copy

    Pezeshki, Mohammad Majd, & Alielahi, Hamid. (2018). Assessment of Seismic Non-linear Behavior of Hill-Type Topographies Subjected to propagating SV Waves. BULLETIN OF EARTHQUAKE SCIENCE AND ENGINEERING, 5(2 ), 15-33. SID. https://sid.ir/paper/265842/en

    Vancouver: Copy

    Pezeshki Mohammad Majd, Alielahi Hamid. Assessment of Seismic Non-linear Behavior of Hill-Type Topographies Subjected to propagating SV Waves. BULLETIN OF EARTHQUAKE SCIENCE AND ENGINEERING[Internet]. 2018;5(2 ):15-33. Available from: https://sid.ir/paper/265842/en

    IEEE: Copy

    Mohammad Majd Pezeshki, and Hamid Alielahi, “Assessment of Seismic Non-linear Behavior of Hill-Type Topographies Subjected to propagating SV Waves,” BULLETIN OF EARTHQUAKE SCIENCE AND ENGINEERING, vol. 5, no. 2 , pp. 15–33, 2018, [Online]. Available: https://sid.ir/paper/265842/en

    Related Journal Papers

    Related Seminar Papers

  • No record.

    • Related Plans

  • No record.

    • Recommended Workshops






    Move to top