مهندسی سازه و ساخت

مهندسی سازه و ساخت

ارزیابی شکنندگی لرزه‌ای قاب‌های ساختمانی فولادی مهاربندی‌شده در سطوح خسارت مختلف با درنظر گرفتن تاثیر مقیاس‌های شدت متفاوت

نوع مقاله : علمی - پژوهشی

نویسندگان
1 فارغ‌التحصیل کارشناسی ارشد سازه، دانشکده مهندسی عمران، دانشگاه تبریز، تبریز، ایران
2 دانشیار، دانشکده مهندسی عمران، دانشگاه تبریز، تبریز، ایران
چکیده
هدف این مقاله استخراج و ارزیابی شکنندگی لرزه‌ای قاب‌های ساختمانی فولادی مهاربندی شده در سطوح خسارت مختلف با درنظر گرفتن تاثیر شاخص‌های شدت لرزه‌ای متفاوت می‌باشد. برای این منظور از مدل‌های اجزای محدود دو قاب‌ فولادی پنج و ده طبقه دارای مهاربند کمانش‌تاب (BRB) تحت 44 رکورد زلزله حوزه دور FEMA-P695 استفاده شده است. با استفاده از تحلیل‌های دینامیکی افزایشی مدل‌ها، منحنی‌های شکنندگی لرزه‌ای به‌ صورت تابعی از چهار شاخص شدت لرزه‌ای مختلف شامل حداکثر شتاب زمین (PGA)، حداکثر سرعت زمین (PGV)، شتاب طیفی در مود اول ارتعاش سازه (Sa (T1, 5%)) و شتاب طیفی وزن‌دار در سه مود اول سازه (Sa (T123, 5%))، به دست آمد. همچنین براساس معیار جابجایی نسبی بین طبقه‌ای، چهار سطح عملکردی (خسارت) به صورت سطح آسیب یا خسارت خفیف، ملایم، وسیع و کامل برای حصول منحنی‌های شکنندگی در نظر گرفته شد. نتایج حاصل نشان می‌دهد بهترین شاخص شدت لرزه‌ای تابعی از سطح خسارت مورد نظر میباشد، بطوریکه در سطوح خسارت پایین که رفتار سازه تا حد زیادی خطی می‌باشد، مقادیر طیفی باعث کاهش چشمگیر در پراکندگی نتایج نسبت به دو شاخص شدت دیگر می‌شوند و در نتیجه کارایی بالاتری دارند؛ در حالیکه در سطوح خسارت بالا که رفتار غیرخطی کاملا حاکم می‌شود، اختلاف کارائی شاخصهای شدت مختلف کمتر می‌شود. همچنین مقایسه مقادیر عددی احتمال آسیب در دو سطح خطر زلزله سطح طراحی (DBE) و حداکثر زلزله محتمل(MCE) نشان داد که انتخاب شاخص شدت می‌تواند مقدار عددی حاصل برای احتمال آسیب را به مقدار قابل توجهی تحت تاثیر قرار دهد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Evaluation of seismic fragility of braced steel building frames at various damage states by considering the effect of different intensity measures

نویسندگان English

Reza Saadi Andis 1
Saman Bagheri 2
1 M.Sc., Faculty of Civil Engineering, University of Tabriz, Tabriz, Iran
2 Associate Professor, Faculty of Civil Engineering, University of Tabriz, Tabriz, Iran
چکیده English

The purpose of this article is to extract and evaluate the seismic fragility of braced steel building frames at different damage states by considering the effect of different seismic intensity measures. For this purpose, the finite element models of two steel frames with buckling-restrained braces (BRBs) have been used under 44 far-field earthquake records of FEMA-P695. Using incremental dynamic analysis (IDA) of models, seismic fragility curves of buildings as functions of four different seismic intensity measures including peak ground acceleration (PGA), peak ground velocity (PGV), spectral acceleration at the first mode of structural vibration (Sa (T1, 5%)) and weighted spectral acceleration with three modes (Sa (T123, 5%)) were obtained. Based on the criterion of interstory drift, four damage states including slight, moderate, extensive and complete damage were also considered to obtain fragility curves. The results show that the best seismic intensity measure depends on the desired damage states. At low damage states, where the response of the structure is mainly linear, the spectral parameters cause a significant reduction in the dispersion of the results compared to the other two intensity measures, and as a result, they are more efficient. However, at high damage states, where the nonlinear behavior becomes completely dominant, the difference in efficiency of different intensity measures decreases. Furthermore, the comparison of numerical values of probability of damage in two seismic hazard levels, i.e., design basis earthquake (DBE) and maximum considered earthquake (MCE) showed that the selection of the intensity measure can significantly affect the numerical values of the probability of damage.

کلیدواژه‌ها English

Fragility curve
Earthquake
Incremental dynamic analysis
Seismic intensity measure
Steel building frame
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  • تاریخ دریافت 13 دی 1402
  • تاریخ بازنگری 12 اسفند 1402
  • تاریخ پذیرش 30 فروردین 1403