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رفتار بعد از ترک دال مجوف بتن مسلح در خمش | ||
تحقیقات بتن | ||
دوره 15، شماره 2 - شماره پیاپی 38، تیر 1401، صفحه 51-64 اصل مقاله (1.62 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22124/jcr.2022.21007.1532 | ||
نویسندگان | ||
سیده مائده معینی* 1؛ جواد رزاقی لنگرودی2 | ||
1دانشجوی دکترا عمران- سازه، دانشکده فنی، دانشگاه گیلان | ||
2استادیار گروه مهندسی عمران، دانشکده فنی، دانشگاه گیلان | ||
چکیده | ||
دالهای مجوف بتنی به علت مزایای زیادی که از لحاظ عملکردی و اقتصادی دارند، امروزه به یکی از سیستم های پرکاربرد در سقف ساختمانها و عرشه پلها تبدیل شده اند. با وجود تحقیقات و مطالعات عددی و آزمایشگاهی جامعی که بر روی دالهای مجوف و عملکرد آنها صورت گرفته است، اطلاعات اندکی درباره رفتار بعد از ترک این نوع دالها وخصوصا ویژگی سخت شدگی کششی در آنها وجود دارد. رفتار بعد از ترک عمدتا در دالها و تیرهای توپر مورد مطالعه قرار گرفته است و در این میان دالهای مجوف کمتر مورد توجه قرار گرفته اند. در این تحقیق 9 رابطه معروف تنش-کرنش کششی بتن که اثر سخت شدگی کششی نیز در آنها لحاظ شده، مورد مطالعه قرار گرفته و کارایی آنها در پیش بینی رفتار دالهای مجوف بتنی مورد بررسی قرار گرفته است. بدین منظور یک برنامه کامپیوتری بر مبنای مدل لایه ای برای تحلیل دالها و تیرهای سوراخدار ارائه شده است. در نهایت با به کارگیری روابط تنش-کرنش کششی مذکور برای بتن در برنامه کامپیوتری و مقایسه نتایج عددی با نتایج آزمایشگاهی بهترین رابطه کششی بتن برای پیش بینی رفتار دالهای مجوف بتن مسلح بعد از ترک معرفی و پیشنهاد میگردد. | ||
کلیدواژهها | ||
دال مجوف؛ رفتار بعد از ترک؛ خمش؛ سخت شدگی کششی؛ مطالعات عددی | ||
مراجع | ||
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