بررسی شاخص‌های تعیین آسیب لرزه‌ای در قاب‌های بتنی و معرفی یک شاخص جدید برای تشخیص طبقات آسیب‌دیده

نوع مقاله : علمی - پژوهشی

نویسندگان

1 گروه عمران، دانشکده فنی، دانشگاه گیلان، رشت، ایران

2 سازه وزلزله، دانشکده مهندسی عمران، دانشگاه صنعتی نوشیروانی بابل،بابل،ایران

چکیده

مطالعه سازه آسیب‌ندیده که منجر به تشخیص طبقات با پتانسیل آسیب‌دیدگی بیشتر در صورت وقوع زلزله بشود، می‌تواند کمک شایانی در کاهش خسارات ناشی از زلزله داشته باشد. برای این منظور باید بتوان خسارت در طبقه را بر اساس دریافت اطلاعاتی از سازه و به کمک شاخص‌های خسارت تعیین کرد. از این حیث در این مقاله، چند قاب خمشی بتنی در برنامه IDARC مدلسازی شده و تحت تحلیل بارافزون قرار گرفتند. با استفاده از نتایج این تحلیل و نیز مقادیر شاخص خسارت پارک و انگ، 5 سناریوی خرابی مشخص شد. برای پایش خسارت مدل‌ها در این سناریوها‌، در بخشی از مطالعه، خرابی کل سازه به کمک شاخص‌های پارک و انگ، رافایل و میر و نیز تغییر مکان نسبی جانبی (دریفت) بررسی شده و ارتباط بین شاخص‌ها ارائه شد و در ادامه کار به کمک شاخص‌های خسارت در مقیاس طبقه، طبقات آسیب‌دیده مشخص شدند و نتایج با یکدیگر مقایسه شد. از معیار آماری پیرسون نیز برای بررسی همبستگی بین داده‌های مربوط به خسارت تیرها و ستون‌های طبقات و نیز معیار دریفت استفاده شد. بر اساس اطلاعات مودال، شاخص خسارت جدیدی به نام MMFDI بر اساس شیب بردار شکل مود و فرکانس ارائه شد و دقت آن در مقایسه با سایر شاخص‌های مودال روی مدل‌های مورد مطالعه بررسی شد. مطالعات نشان داد که دریفت طبقه، شاخص قابل اعتمادی جهت شناسایی طبقه آسیب‌دیده در ساختمان است که همخوانی بسیار مناسبی با شاخص خسارت تیرهای طبقه پارک دارد. همچنین نتایج نشان داد که به کمک شاخص‌های مودال می‌توان طبقه آسیب‌دیده را با دقت خوبی شناسایی کرد که شاخص جدید تعریف‌شده در این مقاله با استفاده از پارامترهای حساس‌تر به آسیب توانست دقت تعیین طبقه یا طبقات محتمل آسیب‌دیدگی را نیز افزایش دهد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Evaluation of Seismic Damage indexes in Concrete Frames and Introducing a New damage index for Detection of Damaged stories

نویسندگان [English]

  • meisam mazloom 1
  • Nosratollah Fallah 2
1 Faculaty of engineering,University of guilan,rasht,iran
2 Structural & Earthquake,Civil Engineering,Babol Noshirvani University of Technology,Babol,Iran
چکیده [English]

Studying the undamaged structure that can identify the stories with the greatest potential for damage in the event of an earthquake, can be a great help in reducing the damage caused by the earthquake. for this purpose , the damage to the story should be determined based on the information obtained from the structure and the calculation of damage indexes . In this paper, several Rc moment frames in the IDARC program are modeled and the Pushover analysis is performed on them. Based on the results of this analysis, 5 damage scenarios were selected. In order to monitor the models' damage in these scenarios, in a part of the study, the total damage of the structure was estimated using Park &Ang Damage Index, Rafael and meyer index and Drift index and the relationship between the indexes was presented. At the Story scale, the affected Stories were detected and the results compared. Subsequently, the affected stories were identified using Story-scale damage indexes and the results were compared. Pearson's statistical criterion was used to investigate the correlation between the damage data of the beams and columns of the floors as well as the drift criterion. Based on the modal information, a new damage index called MMFDI was developed and its accuracy was compared with the other modal indexes on the studied models. Studies have shown that story drift is a reliable index for identifying damaged stories in a building and is very well matched with the results of park&ang beam damage index. The results also showed that with the help of modal indexes, the damaged stories can be accurately identified, and the new index developed in this paper can increase the accuracy of detection the probable damaged stories by using more sensitive parameters.

کلیدواژه‌ها [English]

  • Pushover analysis
  • Damage index
  • Drift
  • Rc frame
  • Story damage index
  • Modal based damage index

مراجع

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سابقه مقاله

  • تاریخ دریافت: 28 دی 1398
  • تاریخ بازنگری: 10 تیر 1399
  • تاریخ پذیرش: 28 تیر 1399

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