@article { author = {Hanteh, M. and Rezaifar, O. and Gholhaki, M.}, title = {Selecting the appropriate wavelet function in the damage detection of precast panel building based on experimental results and numerical method}, journal = {Sharif Journal of Civil Engineering}, volume = {37.2}, number = {2.2}, pages = {131-147}, year = {2021}, publisher = {Sharif University of Technology}, issn = {2676-4768}, eissn = {2676-4776}, doi = {10.24200/j30.2020.56237.2812}, abstract = {Most building structures are damaged over time under environmental conditions and external loads. In this regard, the occurrence of damage is common and the detection of damage is the subject of much research. In this regard, wavelet conversion, which is a powerful mathematical tool for signal processing, has attracted the attention of many researchers in the field of health monitoring. In this study, free vibrations of a four-story building with specified boundary conditions and monitored the health of the building based on experimental results using the continuous wavelet analytical method are studied and the damage that may occur in these structures were evaluated and analyzed. The finite element software is used to Model of the Building by the sandwich model. In this four-story building, eight-layer sandwich panel (polystyrene, concrete, steel, concrete) is used symmetrically. The fourteen natural frequencies of the sandwich structure were compared with the experimental model and the main modes of the structure were obtained to influence the health of the structure. An error of less than 2.5% reveals a good match between the results of the two models. Precast panel health monitoring results show that based on the experimental results, the damage location using the coif5 function with scale parameter 8 has been successfully identified and showed a higher perturbation of the coefficients at the damage locations than the other functions. Thus, the relative maximum and minimum jumps in the wavelet coefficients occurred at the location of the damage and considering the maximum or minimum wavelet coefficients generated at the damage location as the center of damage, the damage center can be identified with an error of less than 8%. Also, effects of higher modes are more pronounced in the damage intensity index as in the torsional modes of the structure, the maximum wavelet coefficients are greater and the intensity of the damage more pronounced.}, keywords = {3D Panel,Wavelet analysis,structural health monitoring,Damage detection,signal processing}, title_fa = {انتخاب تابع موجک مناسب در تشخیص خرابی ساختمان پیش ساخته پانلی مبتنی بر نتایج آزمایشگاهی و روش عددی}, abstract_fa = {بیشتر سازه‌های عمرانی به مرور زمان و تحت شرایط محیطی و بارهای خارجی دچار آسیب می‌شوند و همواره وقوع خرابی امری اجتناب‌ناپذیر است. لذا تشخیص آسیب، موضوع بسیاری از مطالعات بوده است. در این زمینه، تبدیل موجک که یک ابزار ریاضی توانمند پردازش سیگنال است، در حوزه‌ی پایش سلامت، نظر بسیاری از پژوهشگران را به خود جلب کرده است. پژوهش حاضر به پایش سلامت ساختمان پیش‌ساخته‌ی پانلی کامل بر مبنای نتایج آزمایشگاهی و به کمک روش تبدیل موجک پیوسته پرداخته است و آسیب‌هایی که ممکن است در سازه‌های مذکور رخ دهند، ارزیابی شده است. با توجه به نتایج آزمایشگاهی و تحلیل نتایج توابع موجک مختلف، موقعیت خرابی به کمک تابع ۵ c‌o‌i‌f با پارامتر مقیاس ۸ با موفقیت شناسایی شده است. همچنین اثر مودهای بالاتر در نمایش شدت خرابی محسوس‌تر بوده است، به طوری که در مود پیچشی سازه، بیشینه‌ی ضرایب موجک بزرگ‌تر و شدت خرابی بیشتر نمایان شده است.}, keywords_fa = {پانل سه‌بُعدی,تبدیل موجک,پایش سلامت سازه,تشخیص خرابی,پردازش سیگنال}, url = {https://sjce.journals.sharif.edu/article_22187.html}, eprint = {https://sjce.journals.sharif.edu/article_22187_b0658af12b5083649e1b58bccaed1fa2.pdf} }