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هشتمین کنگره ملی مهندسی عمران
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  • the inspection of site characteristics on far field dynamic stiffness of soil-structure systems in coupled ssi analyses using the cone model

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 761
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     to anticipate the response of a foundation to seismic excitations including earthquakes, machinery loadings and explosions, it is essential to have at hand the dynamic stiffness of each two media which are attached to one. in coupled analysis methods, substructure and rigorous methods are made use at the same time each involving its own advantages and the whole putting aside individual disadvantages. in this paper, assuming the cone model as the method going to be used for the far field impedance calculation, different site characteristics have been inspected and their effects on dynamic stiffness of the far field are observed. having categorized the problem into three major classes including uniform infinite, continuously non-uniform infinite sand and continuously non-uniform sand resting on bedrock, amplitudes of dynamic stiffness are calculated and it is observed that for infinite sand the more the depth gets the more the impedance amplitude results; and this is the case for all different site considerations. convergence is observed for non-uniform infinite sand around a frequency of about 10 rad/sec with discrepancies observed for bigger frequencies. this is while for the half space consisting of uniform sand results converge for frequencies between 20 and 30 rad/sec and no discrepancy is observed afterwards. for the half space restricted to bedrock, the impedance amplitude period against frequency decreases with depth and no convergence is observed except for greater depths.

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