شناسایی موقعیت و شدت ترک‌های چندگانه در تیر طره‌ی بتن‌آرمه با استفاده از تحلیل مودال و آنالیز موجک

نوع مقاله: علمی - پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه قم، قم، ایران

2 استادیار، دانشکده فنی و مهندسی، دانشگاه قم، قم، ایران

3 دانشیار، دانشگاه سمنان، سمنان، ایران

4 دانشجوی کارشناسی ارشد مهندسی عمران، دانشگاه سمنان، سمنان، ایران

چکیده

در این تحقیق روش شناسایی ترک‌های چندگانه در تیر طره بتن مسلح بر پایه تبدیل موجک ارائه شده است. به این منظور، سناریوهای مختلف خرابی در تیر بتنی درنظر گرفته شد. سپس، شکل های مودی چهار مود اول تیر در حالت سالم و آسیب دیده با استفاده از نرم افزار ABAQUS استخراج گردید. شکل های مودی بدست آمده برای شناسایی آسیب های در نظر گرفته شده، تحت تبدیل موجک پیوسته و گسسته قرار گرفتند. مشاهده شد که موجک گسسته به موقعیت آسیب برای تیر بتنی تعریف شده در این مطالعه، نسبت به موجک پیوسته حساس تر می باشد. همچنین اثر مرتبه مودها و تاثیر فاصله آسیب از تکیه‌گاه در شناسایی آسیب ارزیابی شد. ملاحظه شد که فاصله ترک‌ها از یکدیگر تاثیری در شناسایی موقعیت آنها ندارد.

کلیدواژه‌ها


عنوان مقاله [English]

Identifying location and severity of multiple cracks in reinforced concrete cantilever beams using modal and wavelet analysis

نویسندگان [English]

  • Tahere Arefzade 1
  • Seyed Rohollah Hosseini Vaez 2
  • Hosein Naderpour 3
  • Amir Ezzodin 4
1 MSc student in Civil Engineering, Faculty of Engineering, University of Qom, Qom, Iran
2 Assistant Professor, Department of Civil Engineering, Faculty of Engineering, University of Qom, Qom, Iran
3 Associate Professor, Faculty of Civil Engineering, Semnan University, Semnan, Iran
4 MSc student in Civil Engineering, Faculty of Civil Engineering, Semnan University, Semnan, Iran
چکیده [English]

In this paper, a method of multiple cracks detection in a cantilever reinforced concrete beam based on wavelet transform is presented. For this purpose, different damage scenarios in concrete beam were considered. Then, the four first mode shapes of undamaged and damaged beam using ABAQUS software were extracted. The estimated mode shapes of the beam are analyzed by the continuous and discrete wavelet transform (CWT & DWT) to detect the damage scenarios. It was found that DWT is more sensitive to damage location than CWT in the concrete beam which introduced in this paper. Also, the influence of the mode order and the effect of damage distance from support on the effectiveness of damage detection was evaluated. It was observed that the distance of cracks to each other have no effect on identifying their location.

کلیدواژه‌ها [English]

  • Damage detection
  • concrete beam
  • Mode shape
  • Continuous wavelet
  • Discrete wavelet

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