آسیب‌یابی در سازه‌ تیر فولادی مبتنی بر مقایسه نتایج تحلیلی آنالیز موجک

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری سازه، دانشکده مهندسی عمران، دانشگاه کردستان، سنندج، ایران

2 استاد، دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران

3 هیئت علمی گروه مهندسی عمران، دانشکده مهندسی، دانشگاه ولایت، ایرانشهر، ایران

چکیده

پایش سلامت سازه‌ها با هدف تأمین ایمنی و کاهش هزینه‌های نگهداری مورد توجه بسیاری از پژوهشگران است. تیرها و ستون‌ها از اعضای اصلی سازه‌های مهندسی عمران هستند و طراحان انتظار دارند آخرین اعضای آسیب‌دیده سازه‌ها از تیرها و ستون‌ها باشد. در این مقاله به شناسایی آسیب تیر فولادی بر اساس داده‌های دینامیکی مودال پرداخته شده است. پس از انجام آنالیز مودال تیر مدل‌سازی شده در نرم افزار اجزا محدود ABAQUS اطلاعات مودال شامل فرکانس‌ها و شکل‌های مود سالم و آسیب استخراج شد. تفاوت در مقادیر فرکانس وضعیت‌های اولیه و ثانویه به دلیل وجود آسیب مشاهده گردید. همچنین، مقادیر معیار همبستگی مودال (MAC) کمتر از 1 به دست آمد که تائیدی بر وجود آسیب است. پردازش سیگنال‌های شکل مود سالم و معیوب با استفاده از روش تحلیلی آنالیز موجک در محیط نرم افزار MATLAB.R2021a انجام شد. در تمامی مودها مقایسه بین نمودار‌ سیگنال‌‌های خروجی وضعیت‌های سالم و آسیب تفاوت را در منطقه آسیب نشان می‌دهد به نحوی که با یک بررسی ساده می‌توان موقعیت‌های آسیب را با خطای کمتر از 2% شناسایی نمود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Damage Identification in Steel Beam Structures Based on the Comparison of Analytical Results of Wavelet Analysis

نویسندگان [English]

  • Mohtasham Khanahmadi 1
  • Majid Gholhaki 2
  • Omid Rezaifar 2
  • Behzad Dejkam 3
1 Ph.D. Student of Structural Engineering, Faculty of Civil Engineering, University of Kurdistan, Sanandaj, Iran
2 Professor, Faculty of Civil Engineering, Semnan University, Semnan, Iran
3 Department of Civil Engineering, Faculty of Engineering, Velayat University, Iranshahr, Iran
چکیده [English]

Numerous researchers focus on monitoring the health of structures to ensure safety and reduce maintenance costs. Beams and columns are the primary elements of structures in civil engineering, and designers expect beams and columns to be the last elements to experience damage. This paper identifies steel beam damage based on dynamic modal data. After a modal analysis was performed on the modeled beam using the ABAQUS finite element software, modal information was extracted, including the frequencies and shapes of healthy and damaged modes. Due to the presence of damage, differences in the frequency values of primary and secondary conditions were observed. In addition, modal assurance criteria (MAC) values below one were obtained, confirming the presence of damage. Using an analytical method based on wavelet analysis, MATLAB.R2021a processed healthy and damaged mode shape signals. In all modes, a comparison of the output signal diagrams of healthy and damaged modes revealed the difference in the damaged area, allowing the damage locations to be identified with an error of less than 2 percent using a simple examination.

کلیدواژه‌ها [English]

  • "Structural Health Monitoring"
  • "Modal Analysis"
  • "Signal Processing"
  • "Wavelet Transform"
  • "Damage Identification"

مراجع

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