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هفتمین کنفرانس بین المللی زلزله شناسی و مهندسی زلزله
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  • evaluation of the effect of pgv/pgaratio of strong ground motions onresponses of soil structure sdofsystems

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    • تاریخ ارائه: 1394/02/01
    • تاریخ انتشار در تی پی بین: 1394/02/01
    • تعداد بازدید: 636
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     generally, in order to evaluate the seismic demand of structures, it is assumed that the structure is located on a rigid soil. however, with increasing the soil flexibility there will be significant variations in the structural response, i.e. the effects of soil-structure interaction (ssi). furthermore, in the near-field zone, pulse-like motions play crucial roles in the design of structures. this paper addresses the effects of peak ground velocity to peak ground acceleration ratio (pgv/pga) of near-fault ground motions as a compound intensity index that can describe the frequency characteristics of ground motion on response of various soil-structure sdof systems. a total 49 near-field ground motions records were selected which have been classified into two categories: first, records with a strong velocity pulse, (i.e. forward-directivity); second, records with a residual ground displacement (i.e. fling-step). parametric studies between pgv/pga ratio of pulse-like ground motions and maximum relative displacement (umax) indicate that with increase in structure-to-soil stiffness ratios (s-), earthquakes with higher pgv/pga ratio produce greater responses. moreover, increasing in slender ratios (h-) and decreasing in mass ratios (m-) result in the responses of soil-structure sdof systems become greater in all structure-tosoil stiffness ratios.

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