مکان‌یابی آسیب در پل در حضور پروفیل سطح جاده با استفاده از اندازه‌گیری ارتعاشات وسیله نقلیه عبوری

مرعشی, سیدمازیار; پاشایی, محمدهادی; خطیبی, محمد مهدی

doi:10.22075/jtie.2019.17539.1376

مکان‌یابی آسیب در پل در حضور پروفیل سطح جاده با استفاده از اندازه‌گیری ارتعاشات وسیله نقلیه عبوری

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ دانشجوی دکتری، دانشکده مهندسی مکانیک، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران

² دانشیار، دانشکده مهندسی مکانیک، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران

³ استادیار، دانشکده مهندسی مکانیک، دانشگاه سمنان، سمنان، ایران

10.22075/jtie.2019.17539.1376

چکیده

مکان‌یابی مستقیم آسیب در پل مستلزم به‏کارگیری تعداد زیادی حسگر ارتعاشی روی سازه است که این امر معمولاً پُرهزینه‌ و زمان‌بر می‌باشد. در برهم‌کنش وسیله نقلیه– پل، پاسخ ارتعاشی وسیله نقلیه عبوریشامل پاسخ ارتعاشی پل نیز می‌باشد که می‌توان از آن برای استخراج پارامترهای مودال پل بهره برد. در این مقاله، به منظورمکان‌یابیغیرمستقیم آسیب در پل از نسبت انتقال‌پذیری پاسخ وسیله نقلیه استفاده شده است. با نصب شتاب‌سنج روی محور وسیله نقلیه، اندازه‌گیری شتاب در حین حرکت صورت می‌گیرد و نیازی به توقف وسیله نقلیه روی پل ندارد. در اغلب روش‌ها، فرض بر این است که نیروی تحریک به صورت نویز سفید باشد. اما در این روش، خصوصیات نیروی تحریک در نظر گرفته نمی‌شود، که این مورد از دیگر مزایای روش می‌باشد. از آنجا که وجود پروفیل سطح جاده باعث می‌شود شناسایی پارامترهای مودال دشوار گردد، در این مقاله از تفاضل سیگنال شتاب از دو محور مشابه برای حذف اثر پروفیل سطح استفاده شده است. در شبیه‌سازی عددی به روش المان محدود، پل با حضور پروفیل سطح و سه وسیله نقلیه به صورت سیستم‌های دو درجه آزادی جرم- فنر- دمپر مدل شده‌اند. با حل هم‌زمان مدل پل- وسیله نقلیه و سپس حذف اثر پروفیل سطح، شناسایی شکل مود پل میسر می‌گردد. سپس، مسأله برهم‌کنش پل- وسیله نقلیه با درنظر گرفتن آسیب در پل، مجدداً حل شده و مکان‌یابی آسیب با استفاده از شاخص تغییر انحنای شکل مود مورد بررسی قرار گرفته است. نتایج شبیه‌سازی عددی دلالت بر توانایی روش پیشنهادی در حضور نویز اندازه‌گیری دارد.

کلیدواژه‌ها

عنوان مقاله [English]

Damage Localization of Bridge in the Presence of Road Profile using Vibration Measurement of the Passing Vehicle

نویسندگان [English]

Seyed Maziar Marashi ¹
Mohammad Hadi Pashaei ²
Mohammad Mahdi Khatibi ³

¹ PhD Candidate, Department of Mechanical Engineering, Babol Noushirvani University of Technology, Babol, Iran

² Associate Professor, Faculty of Mechanical Engineering, Babol Noushirvani University of Technology, Babol, Iran

³ Assistant Professor, Faculty of Mechanical Engineering, Semnan University, Semnan, Iran

چکیده [English]

Direct damage localization of bridge involves the use of a large number of vibration sensors on the structure, which is often costly and time-consuming. Through vehicle bridge interaction, dynamic response of a passing vehicle includes the bridge response which may be used for extracting bridge modal parameters. In this paper, transmissibility measurement of the vehicle response is dedicated to localize indirectly the bridge damage. As the sensor is embedded on the axle of the vehicle, recording the signal is fulfilled during the vehicle passage and there is no need to stop the vehicle. There is white noise assumption in most other techniques. But excitation characteristics are not considered in this method; which is another advantage. Since the road profile may cause modal parameter identification to be difficult, subtracting the acceleration signals from two identical axles is used here in order to remove the influence of road profile. In the numerical simulation by finite element method, the bridge model is accompanied by road profile and three vehicles are assumed to be 2DOF systems of mass-spring-damper. By solving the vehicle-bridge interaction equations simultaneously and then removing the effect of road profile, the estimation of bridge mode shape would be possible. Then, by considering bridge damage, the vehicle-bridge interaction equations are solved once more and the damage localization is fulfilled using the changes in the mode shape curvature. Results of numerical simulations indicated the capability of the proposed method in the presence of measured noise.

کلیدواژه‌ها [English]

Bridge health monitoring
Damage localization
Transmissibility
Mode shape curvature
Road profile

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