برآورد پاسخ لرزه‌ای قاب‌های خمشی فولادی در سطح آستانه فروریزش با استفاده از یک روش تحلیل پوش‌اور مودال پیشنهادی

نوع مقاله : مقاله پژوهشی

نویسندگان

پژوهشکده مهندسی سازه، پژوهشگاه بین‌المللی زلزله‌شناسی و مهندسی زلزله، تهران، ایران.

چکیده

برآورد پارامترهای تقاضای مهندسی مبتنی بر جابه‌جایی در فرآیند ارزیابی فروریزش لرزه‌ای سازه‌ها از اهمیت بالایی برخوردار است. در این پژوهش، یک روش پوش‌اور مودال به منظور برآورد این پارامترها توسعه داده می‌شود. در روش پیشنهادی، ابتدا یک معیار فروریزش برای تعیین سطح آستانه فروریزش در تحلیل‌های پوش‌اور پیشنهاد می‌گردد. این معیار براساس منحنی ظرفیت طبقات ارائه شده و تنها به مشخصات سازه وابسته است. سپس به منظور تعیین پارامترهای پاسخ مبتنی بر جابه‌جایی در سطح آستانه فروریزش سازه، یک روش ترکیب پاسخ‌های مودال ارائه می‌شود. در این روش، پاسخ‌های حاصل از تحلیل پوش‌اور مودال با ضرایب حاصل از بهینه‌سازی به صورت جبری ترکیب می‌گردند. دو روش بهینه‌سازی برخورد اجسام و بهینه‌سازی ازدحام ذرات به منظور استخراج این ضرایب مورد استفاده قرار می‌گیرند. بهینه‌سازی بر اساس نتایج تحلیل دینامیکی افزایشی سه قاب خمشی فولادی 5، 8 و 11 طبقه انجام شده است. دو قاب 9 و 12 طبقه نیز به منظور ارزیابی روش پیشنهادی مورد استفاده قرار گرفته‌اند. نتایج تحلیل‌های صورت گرفته نشان می‌دهد روش پوش‌اور پیشنهادی پروفیل دریفت و جابه‌جایی طبقات در آستانه فروریزش سازه را با دقت بسیار خوبی تخمین می‌زند. این روش بسیار کاربردی بوده و برای عموم مهندسین قابل استفاده می‌باشد. 

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Seismic Response Evaluation of Steel Moment Resisting Frames for Collapse Prevention Level Using a Proposed Modal Pushover Analysis Method

نویسندگان [English]

  • Sassan Eshghi
  • Mohammad Mahdi Maddah
  • Alireza Garakaninezhad
Structura Engineering Research Center, International Institute of Earthquake Engineering and Seismology ( IIEES)
چکیده [English]

In this paper, a new nonlinear static (pushover) analysis method is presented to evaluate the displacement-based demands of steel moment-resisting frames (MRFs) at the collapse prevention performance level. In this method, the modal pushover responses are integrated using modal combination coefficients, which are calculated from optimization procedures. Two metaheuristic algorithms, including particle swarm optimization and colliding bodies optimization, are utilized for this purpose. In the proposed procedure, the collapse prevention performance level is obtained by a new suggested criterion, which is based on the onset of severe local damages at the structure. This criterion corresponds to occur backward shape in the story capacity curves. The modal combination coefficients are obtained from incremental dynamic analysis (IDA) results of 5, 9, and 11 story steel moment-resisting frames. The optimized modal pushover (OMPA) method is applied to two 9 and 12 story steel MRF buildings. The results showed that the proposed method is easy to implement and is accurate enough to evaluate the displacement-based responses at the CP performance level. 

کلیدواژه‌ها [English]

  • Modal pushover analysis
  • Modal combination rules
  • Optimization algorithms
  • Seismic collapse assessment
  • Mid-rise steel moment-resisting frames

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 53، شماره 5
مرداد 1400
صفحه 1981-2002

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