ارزیابی اثر عمق ترانشه در کاهش ارتعاشات ناشی از عبور خودروهای سنگین

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، دانشکده عمران، واحد علوم و تحقیقات،دانشگاه آزاد سلامی ، تهران، ایران

2 استاد، دانشکده راه‌آهن، دانشگاه علم و صنعت ایران، تهران، ایران

3 استادیار، دانشکده عمران، واحد علوم و تحقیقات،دانشگاه آزاد سلامی ، تهران، ایران

چکیده

یکی از چالش‌های استفاده از سیستم حمل‌ونقل جاده‌ای تأثیرات ارتعاشات ناشی از خودروها در هنگام عبور از سرعت‌گیرها و ناهمواری‌های سطح جاده بر روی ساختمان‌های مجاور آن‌ها است. این ارتعاشات در مقادیر بالا می‌تواند باعث بروز آسیب در ساختمان‌های حساس و تاریخی گردد. برخورد وسایل نقلیه سنگین با ناهمواری‌ها در سطح جاده باعث ایجاد بارهای دینامیکی می‌شوند که از طریق خاک‌های اطراف به ساختمان‌ها منتقل‌شده و باعث لرزش در آن‌ها می‌شود. در این مقاله به‌منظور بررسی تأثیر استفاده از ترانشه باز با عمق‌های مختلف بر میزان ارتعاشات، یک مدل عددی 5/2 بعدی توسعه داده شد. به این منظور ابتدا میزان بارمحوری ناشی از عبور یک کامیون بر روی سرعت‌گیر در برنامه متلب شبیه‌سازی شد. سپس جهت ارزیابی ارتعاشاتی یک مدل المان محدود از مسیر موردنظر و محیط اطراف آن توسعه داده شد. اعتبارسنجی مدل با نتایج حاصل از اندازه‌گیری میدانی لامبرت صورت گرفته است. بدین منظور با بررسی سرعت ذره و محتوای فرکانسی ارتعاشات در نقاط مختلف، اثر ترانشه مورد ارزیابی قرار گرفت. تجزیه و تحلیل عددی نشان می دهد با افزایش عمق ترانشه، دامنه ارتعاشات کاهش بیشتری دارد و باعث کاهش دامنه فرکانس غالب ارتعاش میشود .

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation in to the Effect of Trench Depth on Reducing Vibrations Caused by the Passage of Heavy Vehicles

نویسندگان [English]

  • Zolfaghar Zarei 1
  • Seyed Javad Mir Mohammad Sadeghi 2
  • Alireza Sarkar 3
1 Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.
2 Professor, School of Rail Engineering, Iran University of Science and Technology, Tehran, Iran.
3 Assistant Professor, Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.
چکیده [English]

Inevitably, vibrations induced by vehicles passing over bumps and surface irregularities affect adjacent buildings. High-amplitude vibrations can be damaging to monumental and historic buildings. The passage of heavy vehicles on irregular road pavement surfaces generates dynamic loads that are transmitted to the buildings through the surrounding soils and cause them to vibrate. To address the aforementioned challenge, herein, a 2.5-dimensional numerical model was developed to investigate the effect of open-trenches with different depths on the amplitude of vibrations. For this purpose, initially, the axial load caused by a truck hurtling over a speed bump was simulated in MATLAB program. Then, a finite element model of the road and its surroundings was developed to evaluate the vibrations. The model was then validated by the results from Lambert field measurements. To evaluate the effect of trench depth, the particle velocity and the frequency content of vibrations at different points were investigated. Numerical analysis indicates that greater trench depth leads to more reduction in the vibrations’ amplitude and a decline in the amplitude of the dominant vibration frequency.

کلیدواژه‌ها [English]

  • Vibration
  • Trench
  • Road Transportation
  • Finite Element

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