ارزیابی عمر خستگی روسازی آسفالتی تحت اثر سرعت بار و فشار باد چرخ به روش عددی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران.

2 دانشکده مهندسی عمران، دانشگاه اصفهان، اصفهان، ایران.

چکیده

خرابی خستگی عبارت است از مجموعه‌ای از ترک‌های متصل به هم در رویه‌ بتن آسفالتی که تحت تکرار بارگذاری ترافیکی به‌وجود می‌آید. عوامل مختلفی سبب پیدایش این نوع از ترک‌ها می‌شود، از آن جمله می‌توان تکرار زیاد تنش‌ها و کرنش‌های کششی در تارهای تحتانی رویه‌ آسفالتی، ضخامت کم رویه و یا اتصال نامناسب لایه‌های آن، تغییرشکل بیش از حد لایه‌های روسازی در اثر بارگذاری، مقاومت کم خاک بستر و سرعت وسایل نقلیه عبوری را نام برد. در این تحقیق، پارامتر سرعت چرخ وسیله نقلیه و همچنین فشار باد لاستیک جهت بررسی عمر خستگی و محاسبه پارامتر تعداد تکرار مجاز عبور، مورد بررسی قرار گرفته است. از این‌رو، از نرم‌افزار آباکوس بهره گرفته شد. جهت شبیه‌سازی چرخ، تنها از نیروهای وارده بر سطح رویه آسفالت استفاده شد. همچنین جهت بررسی و آنالیز خستگی، کرنش افقی زیرلایه آسفالتی مورد بررسی قرار گرفت. جهت صحت‌سنجی نیز پاسخ‌های مدل با نتایج آزمایش میدانی پنسیلوانیا که در سال 1993 میلادی و توسط اداره بزرگراه‌ها‌ی فدرال آمریکا صورت گرفت، مقایسه گردید. نتایج نشان داد که با افزایش سرعت، مقادیر تنش، کرنش و جابه‌جایی کاهش پیدا می‌کند. تأثیر سرعت بر کرنش کششی طولی انتهای لایه آسفالتی در سرعت‌های پایین چشمگیرتر است و با افزایش سرعت از شیب نمودار تغییرات کرنش کاسته می‌شود، به این صورت که با افزایش سرعت از 32 کیلومتر بر ساعت به 56، تقریبا 37 درصد و تا سرعت 80 کیلومتر بر ساعت حدود 42 درصد کاهش کرنش مشاهده می‌گردد. 

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Evaluation of Fatigue Life of Asphalt Pavement under the Effect of Load Speed and Tire Inflation Pressure by Numerical Method

نویسندگان [English]

  • Alireza Shokouhi 1
  • Gholamali Shafabakhsh 1
  • Peyman Hassanzadeh 2
1 Department of Civil Engineering, Semnan University, Semnan, Iran.
2 Department of Civil Engineering, University of Isfahan, Isfahan, Iran.
چکیده [English]

Fatigue failure is a set of interconnected cracks in the asphalt concrete surface that occurs under repeated traffic loading. Various factors cause this type of cracks, including high repetition of tensile stresses and strains in the lower layers of the asphalt surface, low thickness of the surface or improper connection of its layers, excessive deformation of the pavement layers due to loading, low strength of the subgrade and the speed of passing vehicles.  In this research, the tire speed parameter of the vehicle has been investigated in order to evaluate the fatigue life and calculate the parameter of the number of repetitions allowed to pass. Therefore, ABAQUS software was used and only the forces acting on the surface of the asphalt were used to simulate the tire. Also, in order to investigate and analyze the fatigue, the horizontal strain of the asphalt substrate was investigated. In order to check the accuracy, the answers of the model were compared with the results of the Pennsylvania field test that was conducted in 1993 by the US Federal Highway Administration. The results showed that with increasing speed, the values of stress, strain and displacement decrease. The effect of speed on the longitudinal tensile strain at the end of the asphalt layer is more significant at low speeds and the slope of the strain changes graph decreases with increasing speed in such a way that by increasing the speed from 32 kilometers per hour to 56, approximately 37% and up to 80 kilometers per hour, approximately 42% reduction in strain is observed.

کلیدواژه‌ها [English]

  • Top-Down Crack
  • Variable Speed
  • Tire Inflation Pressure
  • Fatigue Life
  • Finite Element Method

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