Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

The effect of employing micro-silica in concrete on ductility of exterior reinforced concrete beam-column joint at ambient temperature and after exposure to high temperatures of fire

Document Type : Original Article

Authors
1 Associate professor, Department of Civil Engineering, Technical and Engineering Faculty, Imam Khomeini International University. Qazvin. Iran.
2 PhD candidate, Department of Civil Engineering. Technical and Engineering Faculty, Imam Khomeini International University. Qazvin. Iran
Abstract
مطالعة حاضر با هدف ارزیابی اثر‌گذاری کاربرد میکروسیلیس بر رفتار شکل‌پذیری اتصال خارجی بتن مسلح در دمای معمولی و همچنین پس از اثر حرارت‌های زیاد آتش‌سوزی صورت گرفته است. بدین جهت، شش نمونة اتصال خارجی مقیاس شدة مشابه در حالات کاربرد و عدم کاربرد میکروسیلیس ساخته شد و نمونه‌ها در شرایط دمای محیط و همچنین پس از اثر دو رژیم‌ حرارتی با دماهای هدف ۴۰۰ و ۶۰۰ درجة سانتی‌گراد، تحت بارگذاری جانبی چرخه‌ای قرار گرفتند. نتایج حاصل نشان داد که در دمای محیط اثر کاربرد میکروسیلیس با بروز مکانیسم غالب حرکت گهواره‌ای المان تیر در مود شکست خمشی اتصال، تغییر جزئی در ضریب شکل‌پذیری و افزایش قابل توجه در ظرفیت استهلاک انرژی همراه بوده است. این در حالیست که تحت اثر دو رژیم‌ حرارتی اعمال شده، کاهش نسبی در پارامترهای مذکور (نسبت به مقادیر متناظر در دمای محیط) بواسطة جایگزینی ۷٪ از سیمان مصرفی با میکروسیلیس تشدید یافت، طوریکه تحت اثر رژیم حرارتی ۶۰۰ درجه، مقادیر کاهش نسبی در ضریب شکل‌پذیری، استهلاک انرژی تجمعی و بار حداکثر بترتیب بمیزان ۱۳/۶٪، ۲۶/۰٪ و ۱۳/۴٪ در مقایسه با حالت عدم کاربرد میکروسیلیس افزایش یافت و به مقادیر قابل توجه ۵۱/۹٪، ۶۴/۱٪ و ۴۶/۷٪ رسید. همچنین، علیرغم بروز گسیختگی برشی برای کلیة نمونه‌های اتصال حرارت دیده، کاربرد میکروسیلیس تغییرات قابل توجهی را در جزئیات الگوی خرابی برشی تحت رژیم حرارتی با دمای هدف ۶۰۰ درجه ایجاد نمود و موجب بروز خرابی شکننده‌تری در هستة اتصال گردید.
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  • Receive Date 07 June 2025
  • Revise Date 07 August 2025
  • Accept Date 05 September 2025