مطالعه ضربه دو ساختمان قاب خمشی فولادی مجاور یکدیگر در اثر زلزله‌های متوالی دور و نزدیک گسل

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی عمران، موسسه آموزش عالی جهاد دانشگاهی خوزستان، اهواز، ایران

2 دانشکده مهندسی عمران، واحد آبادان، دانشگاه آزاد اسلامی، آبادان، ایران

چکیده

آیین‌نامه‌های لرزه‌ای، پیش‌گام در ارائه ضوابط لرزه‌ای در رفتار غیرخطی سازه‌ها هستند لیکن معمولا توجه کمتری به دو پدیده اصلی می شود. اول پدیده ضربه سازه‌های مجاور است که این پدیده می‌تواند عامل رفتارهای غیرخطی شدید باشد و آیین‌نامه‌ها معمولاً برای پیشگیری از اثرات آن بر سازه‌های مجاور، یک درز انقطاع بین دو سازه پیشنهاد می‌کنند اما در صورت نیاز به بررسی اثر ضربه ساختمان‌های مجاور با درز انقطاع پیشنهاد شده یا اجرا شده، پیشنهادی ارائه نشده است و دوم، اثرات توالی لرزه‌ای است. در این مقاله جهت بررسی ضربه ساختمان‌های خمشی فولادی مجاور یکدیگر در اثر زلزله‌های متوالی دور و نزدیک گسل از شش زوج قاب فولادی با ارتفاع‌های متفاوت، با و بدون اختلاف ارتفاع در طبقه همکف استفاده شده است. این قاب‌ها با استفاده از تحلیل تاریخچه زمانی غیرخطی تحت اثر 24 رکورد زلزلة متوالی حوزة دور و نزدیک گسل در قالب سه دسته ترکیب زلزله سکانسی که با توجه به ویرایش چهارم استاندارد 2800 مقیاس شده‌اند مورد ارزیابی قرار گرفته‌اند. نتایج حاصل از تحقیق نشان داد که درز آیین‌نامه مانع از برخورد قاب‌های مجاور به یکدیگر نگردیده و نیاز به بازنگری داشته ولی به نسبت قاب‌های در تماس که در اکثر موارد ضربه قاب‌ها به یکدیگر منجر به فروریزش سازه گردیده، حالت مناسب‌تری بوده و باعث کاهش خسارات می‌گردد. نیروی ضربه رفتار قاب‌های مجاور برخورد کننده را به نسبت رفتارهای مورد انتظار قاب‌ها در حالت بدون ضربه (قاب‌های جدا از هم) تغییر داده و پاسخ‌های متفاوتی را از خود نشان می‌دهند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Study of the Impact of Pounding of Steel Moment Frames due to Sequential near- and far-fault Earthquakes

نویسندگان [English]

  • Navid Siahpolo 1
  • Seyed Abdonnabi Razavi 2
  • Javad Moslemzadeh 1
1 Department of Civil Engineering, Institute for Higher Education ACECR, Khouzestan, Iran
2 Department of Civil Engineering, Abadan Branch, Islamic Azad University, Abadan, Iran
چکیده [English]

Seismic codes, the pioneers in presenting seismic criteria in the nonlinear behavior of structures, usually address less the two main factors. The first accident hits adjacent structures, which can be a severe nonlinear cause, and regulations are usually used to execute the program on adjacent structures, a discontinuous seam between two adjacent structures, but if necessary, the effect of adjacent buildings with discontinuous joints is recommended. Or, no suggestion is made and second, the sequence is executed. In this paper, in order to investigate the impact of adjacent steel bending structures due to successive earthquakes near and near the fault, six pairs of steel frames with different heights, with and without height differences on the ground floor have been used. These frames have been evaluated using nonlinear time history analysis under the effect of 24 consecutive earthquakes in the near and far faults in the form of three sequential seismic composition scales that have been scaled according to the fourth edition of the 2800 standard. The results of the study showed that the seam of the regulation did not prevent adjacent frames from colliding with each other and needed to be reviewed, but compared to the frames in contact, which in most cases led to the collapse of the frame, it is more suitable and reduces damage. . Impact force changes the behavior of adjacent colliding frames relative to the expected behaviors of the frames without impact (separate frames) and exhibits different responses.

کلیدواژه‌ها [English]

  • Discontinuous joint
  • Gap element
  • Sequential earthquake
  • Far fault
  • Near fault
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