پیاده‌سازی روش انرژی و ارزیابی دقت روابط کاهش شکل‌پذیری در تخمین پاسخ لرزه‌ای سازه‌های مرکزگرا

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی، دانشگاه زنجان، زنجان، ایران

چکیده

ترمیم خسارات ناشی از تغییر شکل‌های ماندگار پس از زلزله در سازه­های رایج هزینه زیادی دارد. از این ‌رو سازه­ های مرکزگرا جهت کاهش تغییر شکل‌های ماندگار پس از زلزله توسط محققین معرفی شده است. در طراحی معمول این سازه ­ها به روش نیرویی، برای محاسبه برش پایه از یک ضریب رفتار مشخص جهت در نظر­گیری رفتار غیرالاستیک استفاده می­ شود که به‌ خوبی نمی ­تواند بیانگر عملکرد واقعی سازه ­ها باشد. از طرفی روش انرژی با انتخاب مکانیزم تسلیم مطلوب و تغییر مکان هدف در ابتدای روند طراحی، برآورد دقیق‌تری از نیروی وارد بر سازه نسبت به روش نیرویی ارائه می­ دهد. از آنجایی‌ که تاکنون این روش برای تحلیل سازه­ های مرکزگرا استفاده نشده است، در این مطالعه، برای اولین بار از روش انرژی برای تعیین پاسخ لرزه­ای سازه مهاربندی مرکزگرا استفاده شده و دقت آن با نتایج آزمایشگاهی و تحلیلی مقایسه گردیده است. نتایج مطالعه نشان داد روش انرژی به عنوان یک روش تحلیلی ساده و سریع و بدون نیاز به مدل‌سازی نرم‌افزاری می­ تواند برآورد قابل قبولی از پاسخ سازه ارائه نماید. با مقایسه روابط مختلف کاهش شکل­ پذیری، مشاهده شد که رابطه ارائه شده توسط لای-بیگز به علت انتخاب رکورد زلزله مصنوعی و نزدیک به طیف طراحی مناسب­ترین رابطه، با دقت بالای 80 درصد می­ باشد. همچنین نتایج نشان داد با افزایش ارتفاع سازه، دوران نهایی سازه کاهش یافت که سبب شد دقت روش انرژی با سایر روابط نیز در برآورد پاسخ سازه، به دلیل کاهش شکل­ پذیری افزایش یابد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Implementation of energy method and evaluation of ductility reduction factors accuracy to estimate the seismic response of self-centering structures

نویسندگان [English]

  • Moein Abdolmohammadi
  • Kiarash Nasserasadi
  • Jamal Ahmadi
PhD Student in Civil Engineering, Faculty of Civil Engineering, Zanjan University, Iran
چکیده [English]

Self-centering structures have been introduced to overcome the financial and social difficulties of rebuilding structural damage caused by the residual deformation of structures. On the other hand, applying the force method as a common approach to the design of many structural systems cannot predict the actual performance of this advanced system. Meanwhile, energy-based approaches provide more accurate results than force-based approaches by selecting the desired yield mechanism and the desired displacement at the outset of the design process. In this study, the feasibility of using the energy method to compute the seismic performance of the self-centering concentrically-braced frame (SC-CBF) was evaluated for the first time. Comparing the calculated results with the laboratory and analytical outputs showed that the energy method is an efficient technique that can accurately estimate the structural response without any complex modeling. Also, by comparing the different ductility reduction relationships, it was observed that the equation presented by Lai-Biggs is the most appropriate relationship with more than 80% accuracy because of artificial earthquake records applications. Furthermore, the results revealed that the structure’s ultimate rotation and ductility ratio decreased by raising the structure elevation. The height increase improved the accuracy of predicted values from the energy method with other relationships to estimate the structural response.

کلیدواژه‌ها [English]

  • Self-centering structure
  • Energy-based approach
  • Residual deformation
  • Ductility reduction factor
  • Energy modification factor

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نشریه مهندسی عمران امیرکبیر
دوره 54، شماره 7
مهر 1401
صفحه 2509-2526

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