مطالعه تاثیر شیارشدگی بر رفتار مکانیکی بستر آسفالت تحت بارگذاری متحرک

نوع مقاله: مقاله علمی پژوهشی

نویسندگان

1 دانشکده مهندسی مکانیک، دانشگاه تهران، تهران، ایران

2 عضو هیات علمی دانشکده مهندسی مکانیک دانشگاه تهران

چکیده

شیارشدگی یکی ازاصلی‌ترین اختلالات بوجودآمده دربستر آسفالت است که عملکردآسفالت راتحت‌شعاع قرار می‌دهد. باتوجه به پیچیدگی رفتار آسفالت، دراین مطالعه به شبیه‌سازی پاسخ مکانیکی آن‌تحت اعمال بارگذاری واقعی حرکتی ودو بارگذاری معادل و پالسی که درمطالعات پیشین اغلب بعنوان جایگزین بارگذاری واقعی حرکتی بوده، پرداخته شده است. ازین‌رو یک مدل سازگار ترمودینامیکی ویسکوالاستیک-ویسکوپلاستیک-ویسکوآسیب رابصورت ضمنی گسسته‌سازی زمانی کرده تا درقالب سابروتین UMAT در نرم‌افزار اجزا محدود ABAQUS مورد تحلیل قرار گیرد. درتعداد سیکل بالا، حدود 40درصد اختلاف میزان شیارشدگی دربارگذاری‌های معادل وپالسی نسبت به بارگذاری واقعی حرکتی مشاهده می‌شود. این امر موجب تخمین نادرست عمربسترآسفالت حاصله ازاین دونوع بارگذاری می‌شود.

کلیدواژه‌ها

موضوعات


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