شناسایی ترک‌های مدفون در تیر-ستون‌ها تحت بار محوری با استفاده از داده‌های استاتیکی آزمایشگاهی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد،گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه بین المللی امام خمینی(ره)

2 گروه مهندسی عمران، دانشکده مهندسی، دانشگاه بین المللی امام خمینی (ره)، قزوین، ایران

چکیده

شناسایی آسیب در سازه به منظور جلوگیری از گسترش آن و یا بهسازی مسئله مهمی است که مورد توجه محققین بسیاری قرار گرفته است. علی‌رغم ارائه روش‌های مختلف برای شناسایی آسیب، کشف ترک‌های مدفون در تیر-ستون‌ها کمتر مورد توجه قرار گرفته است. در این پژوهش آزمایشگاهی برای اعمال ترک‌های مدفون به کمک دستگاه ابزار دقیق بر روی تیر-ستون‌های آزمایشگاهی از یک مدل مثلثی استفاده شده است. اندازه المان‌ها به گونه‌ای می‌باشد که طول موثر ترک در داخل المان قرار گرفته و از آن خارج نشده است. برای شناسایی آسیب در تیر-ستون اویلر برنولی تحت بار محوری در این پژوهش از شاخص مبتنی بر داده‌های استاتیکی استفاده شده است. که در این روش برای محاسبه پاسخ‌های استاتیکی از یک روش المان محدودی بهره گرفته شده است. در ادامه بر اساس روش تفاضل مرکزی محدود، شیب و انحنای تغییر مکان‌های افقی محاسبه شده و در شاخص قرار گرفته است. برای این منظور در این پژوهش آزمایشگاهی دو مدل تیر دو سر ساده با سناریو خرابی تکی، چندگانه و بارگذاری متفاوت در نظر گرفته شد. در مرحله اول تغییر مکان‌های آزمایشگاهی به صورت تغییر مکان محوری تیر-ستون ثبت، سپس در شاخص مورد نظر قرار گرفتند و در نهایت مقایسه نتایج آزمایشگاهی و تئوری بیانگر صحت کارایی شاخص مبتنی بر داده‌های استاتیکی می‌بود. همچنین تفاوت جزئی بین نتایج آزمایشگاهی و تئوری بیانگر نویزها و خطاهایی (ساخت قطعات،انجام آزمایش‌ها،خطای سنسورها و...) است که در آزمایشگاه رخ داده بودند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental static data based Embedded Crack Identification of beam-column structures under axial load

نویسندگان [English]

  • MIRSAYYAD HASHEMI 1
  • RAMEZAN ALI IZADIFARD 2
1 M.Sc., Department of Civil Engineering, Faculty of Engineering, Imam Khomeini International University, Qazvin, Iran,
2 Civil Eng. Dep., Engineering Faculty, Imam Khomeini Int. Un., Qazvin, Iran
چکیده [English]

Identification of damage to structures in order to prevent their expansion or improvement is an important issue that has received much attention from researchers. In this experimental study, a triangular model was used to apply the embedded cracks using CNC on the laboratory beam-columns. The size of the elements is such that the effective length of the crack is located inside the element and from it has not been removed. To identify embedded cracks, a static data index was used for Euler-Bernoulli beam-columns under axial load. In this laboratory study, two simple beams models with single, multiple damages and different loading scenarios were used. In the first step, the laboratory horizontal displacements are recorded and then included in the index. Finally, a comparison of the laboratory and the numerical results have shown the performance accuracy of the static database index.

کلیدواژه‌ها [English]

  • Experimental data
  • Embedded crack detection
  • Axial load
  • Simply supported beam-column
  • Static index

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 53، شماره 12
اسفند 1400
صفحه 5139-5154

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