ارزیابی احتمالاتی عملکرد لرزه‌ای ساختمان‌های قاب خمشی فولادی با جداساز سرب لاستیکی

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده فنی و مهندسی، دانشگاه مراغه، مراغه، ایران

چکیده

بررسی احتمالاتی سازه‌ها یکی از روش‌های مناسب جهت در نظر گرفتن اثرات عدم قطعیت و افزایش اطمینان به نتایج حاصل از تحلیل‌ سازه‌ها است. نمودارهای شکنندگی یکی از مؤثرترین روش‌های بررسی و ارزیابی احتمالاتی سازه‌ها هستند. این نمودارها احتمال رخداد خسارت را به صورت تابعی از شدت بار لرزه‌ای اعمالی بر سازه نمایش می‌دهند. روش تحلیل دینامیکی افزایشی (IDA) یکی از متداول‌ترین روش‌های تحلیلی برای ترسیم نمودار‌های شکنندگی است. در این پژوهش به بررسی آماری و احتمالاتی عملکرد لرزه‌ای سازه‌های معیار (SAC) 3 و 9 طبقه فولادی تحت 22 جفت رکورد دور از گسل معرفی شده در FEMA P695 با استفاده از نرم‌افزار OpenSEES پرداخته خواهد شد. سازه‌های ذکر شده با استفاده از تحلیل دینامیکی افزایشی برای حالت بدون جداساز و با جداساز سرب - لاستیکی مورد بررسی قرار خواهند گرفت. سپس با استفاده از نمودارهای IDA، یک رابطه کلی ریاضی متناظر با سازه مورد مطالعه، برای تمامی سطوح عملکرد تعیین خواهد شد، این رابطه معرف مدل احتمالاتی تقاضای لرزه‌ای هر سازه می‌باشد. با استفاده از این روابط، نمودارهای شکنندگی سطح عملکرد فروریزش برای سازه بدون جداساز و با جداساز ترسیم خواهد شد. به منظور ارزیابی احتمالاتی تأثیر سطوح مختلف شدت‌های لرزه‌ای بر عملکرد سازه جداسازی شده، نمودارهای شکنندگی فروریزش برای سه سطح متفاوت از شدت‌های رکوردهای مورد بررسی ارائه شده است. با توجه به نمودارهای شکنندگی ترسیم شده، می‌توان علاوه بر تأثیر سطوح مختلف شدت لرزه‌ای بر عملکرد لرزه‌ای احتمالاتی سازه، تأثیر مثبت جداساز سرب – لاستیکی را در کاهش احتمال رخداد فروریزش مشاهده کرد. همچنین طبق نتایج منحنی شکنندگی، نسبت حاشیه اطمینان فروریزش در سازه 3 و 9 طبقه به ترتیب 100% و 81% افزایش یافته است که نشان دهنده عملکرد احتمالاتی بهتر جداساز در سازه‌های کوتاه مرتبه است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Probabilistic seismic performance evaluation of the steel frame buildings controlled with lead rubber bearings (LRBs)

نویسندگان [English]

  • Mazyar Fahimi Farzam
  • MirAmir yousefi
Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran
چکیده [English]

The probabilistic analysis could effectively apply the effects of uncertainty in the structural analysis, where fragility curves are a well-established technique for the probabilistic evaluation of the structural performance. Notably, incremental dynamic analysis (IDA) is one of the most common analytical methods for obtaining fragility curves. In this study, the statistical and probabilistic seismic performance of 3- and 9-story steel buildings are investigated under 22 pairs of far-fault records introduced in FEMA P695. The seismic performance of both uncontrolled and controlled buildings with LRB is studied using IDA. Then, a general mathematical equation corresponding to each structure will be determined for all damage states known as the probabilistic seismic demand model (PSDM) of the structures. Using this equation, the collapse fragility curve of the structures will be determined for both uncontrolled and controlled structures with LRB. To evaluate the possible impact of different levels of seismic intensities on the performance of the isolated structure, the collapse fragility curves for three different levels of intensities of the benchmark records are presented. According to the collapse fragility curves, in addition to the effect of different levels of seismic intensity on the seismic performance of the structure, it is possible to see the positive effect of the LRB in reducing the probability of collapse. Also, the collapse margin ratio (CMR) in the 3- and 9-story buildings has increased by 100% and 81%, respectively, which indicates the better performance of the LRB isolators in low-rise structures.

کلیدواژه‌ها [English]

  • Fragility Curve
  • Nonlinear Analysis
  • Incremental Dynamic Analysis
  • Passive Control
  • OpenSEES

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نشریه مهندسی عمران امیرکبیر
دوره 55، شماره 1
فروردین 1402
صفحه 163-184

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