ارزیابی عملکرد لرزه‌ای ستون‌های بتن مسلح تحت اثر میزان خوردگی آرماتورهای عرضی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، گروه مهندسی عمران، دانشکده مهندسی عمران و منابع زمین، دانشگاه آزاد اسلامی واحد تهران مرکزی

2 کارشناس ارشد سازه، گروه مهندسی عمران، دانشکده مهندسی عمران و منابع زمین، دانشگاه آزاد اسلامی واحد تهران مرکزی

چکیده

درک رفتار لرزه‌ای ستونهای بتن مسلح محصور توسط خاموت‌های بادرجات مختلف خوردگی از اهمیت بسزایی برخوردار می‌باشد. در این مطالعه سعی می‌گردد تأثیر شاخص‌های عملکرد لرزه‌ای نظیر تنزل مقاومت، میزان استهلاک انرژی، شکل‌پذیری و میرایی هیسترزیس در نمونه‌ها و مدل‌های مختلف به ازای درصدهای مختلف خوردگی خاموت‌ها مورد بررسی و ارزیابی قرار گیرد. با توجه به تحلیل‌های انجام شده نتایج حاصله بیانگر تأثیر غیرمطلوب میزان خوردگی آرماتورهای عرضی بر پیوستگی بین بتن و آرماتور و عملکرد لرزه‌ای ستون می‌باشد. بدلیل تضعیف اثر محصورشدگی هسته بتنی ناشی از شرایط خوردگی شدید آرماتور عرضی، پاسخ‌های لرزه‌ای تنزل یافته و مود خرابی از حالت شکل‌پذیر به شکننده تغییر می‌یابد. با افزایش درصد خوردگی خاموت‌ها، شکل‌پذیری و ظرفیت استهلاک انرژی کاهش می‌یابد، بنحوی‌که کاهش پاسخ ها به درصد خوردگی خاموت‌ها وابسته است. در این مطالعه رابطه کاهندگی برای درصد خوردگی خاموت‌های ستون‌های بتن مسلح تحت مقادیر مختلف مقاومت تسلیم آرماتورهای عرضی، مقاومت مشخصه بتن، پوشش بتن و فاصله خاموت‌ها پیشنهاد گردید. مقادیر پیش‌بینی‌شده حاصل از رابطه کاهندگی پیشنهادی تطابق مناسبی را در قیاس با نتایج تحلیلی نشان می‌دهد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effect of Corrosion Rate of Stirrups on Seismic Performance of Reinforced Concrete Columns

نویسندگان [English]

  • Abbas Ghasemi 1
  • saba ferasati 2
1 Assistant Professor, Department of Civil Engineering, Faculty of Civil and Earth Resources Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran
2 MS Graduated, Department of Civil Engineering, Faculty of Civil and Earth Resources Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran
چکیده [English]

It is essential to properly understand the seismic behavior of reinforced concrete (RC) columns confined by stirrups that experience different corrosion rates. The current study investigated the effect of seismic performance indicators such as strength loss, energy dissipation rate, ductility and hysteresis damping on specimens and models for different stirrup corrosion rates. Analysis revealed the adverse effects of corrosion on the bond performance between the concrete and steel bars which affected the seismic performance of the columns. It was observed that severe corrosion of the stirrups undermined confinement of the concrete core and caused the seismic response to degrade. This changed the failure mode from a ductile to a brittle state. As the corrosion rate of the stirrups increased, their ductility and energy dissipation capacity decreased such that the amount of decrease depended on the corrosion rate. An attenuation relationship is proposed for the corrosion rate of the stirrups for different stirrup yield strengths, concrete compressive strengths, concrete covers and stirrup spacing. The values estimated by the proposed relationship were shown to be in acceptable agreement with the analytical results.

کلیدواژه‌ها [English]

  • CORROSION
  • STIRRUP
  • REINFORCED CONCRETE
  • COLUMN
  • SEISMIC PERFORMANCE

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  • تاریخ دریافت: 09 مرداد 1401
  • تاریخ بازنگری: 10 آذر 1401
  • تاریخ پذیرش: 12 آذر 1401
  • تاریخ اولین انتشار: 12 آذر 1401