رفتار مکانیکی عرشۀ کامپوزیتی متشکل از FRP و هستۀ فولادی

نوع مقاله : پژوهشی

نویسندگان

دانشگاه صنعتی نوشیروانی بابل

چکیده

طراحی عرشه ی پل ها به‌منظور حفظ مقاومت، دوام و پایایی در طول عمر مفید آن ها از چالش های فراروی مهندسان سازه به‌حساب می آید. برای فائق شدن بر این چالش ها راه حل های مختلفی ارائه گردیده است که یکی از آن ها استفاده از سیستم ترکیبی متشکل از مصالح متداول نظیر بتن و فولاد به‌همراه صفحات FRP می باشد که تحت عنوان عرشه های کامپوزیتی نیز شناخته می شود. از آن جایی که این عرشه ها نسبتاً جدید است عملکرد آن ها برای حالت های مختلف کاملاً شناخته شده نمی باشد. تحقیق حاضر به بررسی عرشه ی کامپوزیتی متشکل از هسته ی فولادی و صفحات GFRP اختصاص یافته است. عرشه ی مورد بررسی شامل لایه های فوقانی و تحتانی از جنس GFRP و چندین جعبه ی سلولی فولادی در مرکز است. با استفاده از روش اجزای محدود و تحلیل استاتیکی غیرخطی رفتار این عرشه ها مورد ارزیابی قرار گرفته است در وهله ی اول با نتایج آزمایشگاهی موجود مقایسه و پس از اطمینان از صحتِ مدل سازی عرشه ی کامپوزیتی، تغییر پارامترهای مختلف نظیر ابعاد هندسی، شکل هسته ی فولادی و خواص مکانیکی مصالح صورت پذیرفته است. نتایج نشان می دهد که الگوی گسیختگی عرشه ی مورد مطالعه به‌دلیل تسلیم هسته ی فولادی، نسبت به عرشه های ساخته شده از FRP مطلوب تر است و با افزایش ضخامت و تغییر هندسه ی هسته ی فولادی، می توان ظرفیت باربری عرشه را افزایش داد. هم‌چنین افزایش مدول الاستیسیته ی لایه ی Grid که بیشترین ضخامت را در بین لایه های GFRP دارد، سبب افزایش ظرفیت باربری عرشه می گردد.

کلیدواژه‌ها

عنوان مقاله [English]

Mechanical Behavior of Composite Sandwich Bridge Decks with Hybrid FRP-Steel Core

نویسندگان [English]

  • Elham Alizadeh
  • Mehdi Dehestani
  • Bahram Navayinia
Department of Civil Engineering, Babol Noshirvani University of Technology, Babol.
چکیده [English]

Design of bridge deck with long-term strength, durability and permanence is a significant interest for engineers. One applicable solution to this challenge could be via using hybrid system consisting of conventional materials such as concrete and steel with FRP plates which is also known as composite deck. Since these deck are relatively new so their performance is not completely known. The present study is dedicated to composite deck consists of a steel core and GFRP plates. This composite sandwich bridge deck system is composed of wrapped hybrid core of GFRP grid and multiple steel box cells with upper and lower GFRP facings. The structural performance of deck was evaluated by nonlinear finite element method and numerical results have been compared with available experimental results where possible. After ensuring the validity of numerical modeling of composite deck, parametric studies such as change in geometry, steel core shape and mechanical properties of materials have been done. It was found that failure mode of the proposed hybrid deck was more favorable because of the yielding of the steel tube when compared with that of absolute GFRP decks. Increasing the thickness and changing the steel core geometry can improve the ultimate load capacity of the deck. The grid layer has the maximum thickness among the GFRP layers and therefore ultimate load capacity of the deck enhanced by increase the elastic modulus of grid layer.

کلیدواژه‌ها [English]

  • Composite bridge decks
  • FRP
  • Steel core
  • Grid system
  • Finite Element Method

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