تعیین پاسخ لرزه ای پل صدر تحت اثر اندرکنش خاک-سازه و تحریک غیر یکنواخت

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، گروه مهندسی عمران، دانشگاه خوارزمی، تهران، ایران

2 استاد، گروه مهندسی عمران، دانشگاه خوارزمی، تهران، ایران

3 دانشیار، پژوهشکده مهندسی ژئوتکنیک، پژوهشگاه بین المللی زلزله شناسی و مهندسی زلزله، تهران، ایران

چکیده

چکیده

در سازه‌های عظیم و طویل مانند پل‌ها فرض گیرداری پی و تحریک یکنواخت لرزه‌ای در تمام تکیه گاه های سازه موجب انحراف پاسخ‌ها از واقعیت می‌شود. هدف از انجام این مطالعه ارزیابی پاسخ لرزه ای یک پل طویل تحت اثر اندرکنش خاک- سازه و تحریک غیر یکنواخت می باشد که در آن یک مدل تحلیلی جدید جهت مدل سازی اثر اندرکنش خاک-سازه ارائه شده است. همچنین تحریکات غیر یکنواخت در محل تکیه گاه های مختلف محدوده ی مطالعه ی پل صدر به عنوان یک پل طویل شبیه سازی شد و بر مدل اعمال گردید. مقایسه پاسخ های دینامیکی سازه در شرایط اندرکنش و تحریک غیر یکنواخت با حالت پایه گیردار و تحریک یکنواخت حاکی از تأثیر بسزای هر دو عامل اندرکنش و تحریک غیر یکنواخت در تحلیل و طراحی پل های طویل بوده و نشان داد که عدم در نظرگیری این عوامل ممکن است منجر به پاسخ های دور از واقعیت شود. نتایج بیانگر این مطلب است که در نظر گیری اثر اندرکنش و تحریک غیر یکنواخت می تواند تا 275 و 176 درصد باعث افزایش تغییر مکان نسبی عرشه در راستای طولی و عرضی شود. همچنین لحاظ نمودن اثر اندرکنش به طور میانگین کاهش 67 و 75 درصدی برش و لنگر پایه و در نظر گیری تحریک غیر یکنواخت افزایش 37 و 29 درصدی آن مقادیر را نشان می‌دهد.

کلیدواژه‌ها

موضوعات

مراجع

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سابقه مقاله

  • تاریخ دریافت: 11 مرداد 1397
  • تاریخ بازنگری: 12 شهریور 1400
  • تاریخ پذیرش: 20 شهریور 1400

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