مهندسی سازه و ساخت

مهندسی سازه و ساخت

اثر کاربرد میکروسیلیس در بتن مصرفی بر شکل‌پذیری اتصال خارجی تیر-ستون بتن مسلح در دمای محیط و پس از تحمل حرارتهای ناشی از آتش‌سوزی

نوع مقاله : علمی - پژوهشی

نویسندگان
1 دانشیار، گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه بین المللی امام خمینی (ره)، قزوین، ایران.
2 دانشجوی دکتری، گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه بین المللی امام خمینی (ره)، قزوین، ایران
چکیده
The present study has been conducted with the main objective of evaluating the influence of employing micro-silica in the mix proportion of concrete on the ductility behavior of exterior reinforced concrete (RC) beam-column joint (BCJ) at ambient temperature as well as after exposure to high temperatures of fire. In this way, six similar scaled RC BCJ specimens were fabricated under two conditions of utilizing and not utilizing micro-silica in concrete. BCJ specimens were subjected to cyclic loading at two conditions of ambient temperature and 24 hours after exposure to the heating regimes with target temperatures of 400 and 600. Based on results at the ambient temperature, the utilization of micro-silica was accompanied by the predominant mechanism of beam rocking movement in the flexural failure mode, negligible changes in the ductility factor, and noticeable enhancement in the energy dissipation. Under the applied heating regimes, relative reductions in the mentioned parameters (relative to the corresponding counterparts at ambient temperature) were intensified for the BCJs due to the 7% replacement of cement by micro-silica, so that under the effect of the 600 heating regime, relative reduction values in ductility factor, cumulative energy dissipation, and maximum load increased by 13.6%, 26.0%, and 13.4% and reached to considerable reductions of 51.9%, 64.1%, and 46.7%, respectively. Also, despite the observation of shear failure mode for all heated BCJs, employing micro-silica led to noticeable changes in the details of damage mechanisms under the effect of the 600 heating regime and led to more brittle failure at the joint core.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

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

نویسندگان English

Ramezanali Izadifard 1
Alireza Hajishabanian 2
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
چکیده English

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.

کلیدواژه‌ها English

Exterior beam-column joint
Reinforced concrete
Micro-silica
Ductility
High temperatures
Fire
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  • تاریخ دریافت 17 خرداد 1404
  • تاریخ بازنگری 16 مرداد 1404
  • تاریخ پذیرش 14 شهریور 1404