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نهمین کنگره ملی مهندسی عمران
جزئیات رویداد
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  • the effect of using seismic isolation system under the top stories, on the base shear force of outrigger braced structures

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    • تاریخ ارائه: 1395/01/01
    • تاریخ انتشار در تی پی بین: 1395/01/01
    • تعداد بازدید: 434
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     current research is carried out on outrigger braced steel structures with welded connections, illustrating the effect of using seismic base isolation system under the top stories, on the seismic base shear forces of above mentioned structures. for this purpose, 8 two dimensional 20~61 stories high outrigger braced structures are modeled and designed according to the iranian 2800 seismic code, due to 1st, 2nd and 3rd types of soil specifications and sa=0.25g & sa=0.35 g spectral accelerations. on the next stage, all designed models are equipped with base isolation system under the top one or two stories (based on the height of the structure), to perform as a soft story on the top of the whole structure, demonstrating a tuned mass damper passive control system(tmd) there. after tuning the frequency and the damping ratio for this secondary systems, time history analysis is carried out for all preliminary and secondary systems due to accelerograms recorded on above mentioned site specifications, normalized to sa=0.25g & sa=0.35g. finally, by studying the lateral base shear force of all preliminary and secondary models for all mentioned records, the effects of using base isolation system on the top of outrigger braced structures are discussed.

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