بررسی اثر فیبر پلی‌پروپیلن بر رفتار در برابر حریق قطعات بتنی تونل‌ها

افخمی, وحیدرضا; دهقانی, احسان

doi:10.22075/jtie.2018.15569.1331

بررسی اثر فیبر پلی‌پروپیلن بر رفتار در برابر حریق قطعات بتنی تونل‌ها

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ دانشجوی دکتری، مهندسی سازه، دانشگاه قم، قم، ایران

² استادیار، دانشکده فنی و مهندسی، دانشگاه قم

10.22075/jtie.2018.15569.1331

چکیده

با توجه به اهمیت سامانه‌ی قطار شهری، در طراحی قطعات بتنی تونل‌های قطار شهری علاوه بر عوامل لرزه‌ای، عواملی مثل حریق نیز باید در نظر گرفته شود تا سرویس‌دهی این سامانه بدون وقفه صورت گیرد و دچار اختلال نشود. در ساخت قطعات بتنی تونل‌ها از رده‌ی بتن‌های پرمقاومت بهره گرفته می‌شود که علی‌رغم رفتار لرزه‌ای مناسب، در برابر افزایش دما و حریق، عملکرد مناسبی ندارد. آتش‌سوزی طی یکسری فعل و انفعلات می‌تواند منجر به کاهش ضخامت قطعات بتنی تونل‌ها شده و ایمنی این قطعات را تحت تاثیر خود قرار ‌دهد. در تحقیق پیش‌رو با معرفی یک مدل مبتنی بر نرم‌افزار اجزای محدود آباکوس، رفتار قطعات بتنی تونل‌ها در برابر حریق مورد ارزیابی قرار گرفته است. در ادامه در جهت اطمینان از نتایج تحقیق با معرفی و اعمال انواع منحنی‌های حریق بر قطعه‌ی بتنی، اثر اضافه کردن فیبر پلی‌پروپیلن بر مخلوط بتنی، تحت بررسی قرار گرفته است. نتایج حاصل از این تحقیق بیانگر این موضوع است که اضافه کردن حداقل ۰.۹ کیلوگرم فیبر پلی‌پروپیلن، بصورت یکنواخت، در هر متر مکعب مخلوط بتنی درقطعات بتنی تونل‌ها، تا حد زیادی منجر به بهبود رفتار این قطعات در برابر انواع حریق‌های مورد انتظار شده و از تورق و کاهش ضخامت این قطعات جلوگیری می‌کند.

کلیدواژه‌ها

عنوان مقاله [English]

Evaluate Polypropylene Fiber Effect on Concrete Segments of Tunnel under Fire

نویسندگان [English]

Vahid Reza Afkhami ¹
Ehsan Dehghani ²

¹ دانشجوی دکتری سازه، دانشکده فنی و مهندسی، دانشگاه قم

² Assistant Professor, Faculty of Engineering, University of Qom

چکیده [English]

In today`s world urban railway is one of the important transportation systems that should be examined against various environmental phenomena including fire condition to service permanent citizens. Usually construction of concrete segments of the tunnel simultaneous to used high strength concrete (HSC) that have bad reaction under fire in spite of good seismic reaction. When a fire occurs in tunnel surrounding, some interaction occurred in concrete segments of the tunnel that can reduce the thickness and decrease the safety of these segments. Most of the researches in applying heat effect on concrete segments of the tunnel are experimental and under this situation and analytical or numerical researches in this issue are low. This paper presents an analytical model using ABAQUS software based on the finite element for evaluating concrete segments of tunnel behaviour under fire condition. To ensure the safety of results, some fire curves are applied and effect of Polypropylene fiber in the concrete mix is evaluated. Results show that adding minimum 0.9 Kg per cubic meter of concrete mix in concrete segments of tunnel causing loss of spalling and improve fire behavior interaction.

کلیدواژه‌ها [English]

Concrete segments
fire
Polypropylene fiber
Abaqus software
Spalling

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