توسعه کاربرد طیف انرژی کرنشی در پایش سلامت سازه‌های با سیستم قاب خمشی

نوع مقاله : علمی - پژوهشی

نویسندگان

1 استادیار دانشکده فنی و مهندسی، دانشگاه خوارزمی، تهران، ایران

2 کارشناسی ارشد مهندسی عمران، دانشگاه خوارزمی، تهران، ایران

چکیده

سازه‌ها در طول عمر تحت اثر بارهای معمول مختلفی همانند بار ناشی از تغییر درجه حرارت، ترافیک، خوردگی و بارهای شدید مانند بار لرزه‌ای قرار می گیرند. وقوع خرابی در ساختمان‌ها، پل‌ها، سکوهای نفتی و به‌طورکلی تمام سیستم‌های سازه‌ای در طول عمر سازه امری اجتناب‌ناپذیر است. تاکنون نمونه‌های بسیاری از انواع خرابی‌ها در سازه‌های مختلف مهندسی به ثبت رسیده که در پی وقوع آن‌ها، خسارات جانی و مالی فراوانی به بار آمده است. بیشتر چنین خرابی‌هایی را می‌توان با بررسی‌های اولیه از وضعیت موجود سازه‌ها، اصلاح و ترمیم نمود و بدین ترتیب از گسترش خرابی در سازه‌ها و فروریختن ساختمان‌ها جلوگیری کرد. این موضوع در مناطق زلزله‌خیز که خرابی‌های موضعی در المان‌های سازه‌ها می‌توانند منشأ خرابی‌های کلی باشند اهمیت موضوع پایش سلامتی سازه‌ها را دوچندان می‌نماید. بنابراین تعیین خرابی در سیستم‌های سازه‌ای و اجزای آن برای پایش سلامتی سازه‌ها و افزایش ایمنی و اطمینان از وضعیت موجود سازه‌ها امری مهم و ضروری است. در روش پیشنهادی، انرژی کرنشی طیفی به‌عنوان یک شاخص برای تشخیص موقعیت آسیب بکار گرفته شد. با محاسبه انرژی کرنشی طیفی برای حالت سازه آسیب‌دیده نسبت به سازه سالم، اعضای آسیب‌دیده نمایان می‌گردند. بدین منظور برای سازه با سیستم قاب خمشی تحت سناریوهای مختلف خرابی تحلیل دینامیکی سازه در دو حالت خطی و غیر خطی انجام و  توانایی روش مبتنی بر انرژی کرنشی طیفی در تشخیص محل آسیب مورد بررسی قرار گرفت. نتایج به‌دست آمده بیانگر دقت و عملکرد مناسب روش پیشنهادی برای شناسایی خرابی در سازه‌ها است.

کلیدواژه‌ها


عنوان مقاله [English]

Developing the Application of Strain Energy Spectrum in the Health Monitoring of Steel Resistance Frame Structures

نویسندگان [English]

  • Gholamreza Nouri 1
  • Mohammad Shahrabi 2
  • S.H. Lavasani 1
1 Faculty of Engineering, Kharazmi University, Tehran, Iran
2 Faculty of Engineering, Kharazmi University, Tehran, Iran
چکیده [English]

Structures are subjected to different kinds of loads during their lifetime, such as those caused by daily temperature swings, traffic loads, abrasion and severe loads like earthquake.  The occurrence of damage in building structures, oil platforms, and generally all structural systems is inevitable. Different kinds of failure in various engineering structures have been observed so far, which have incurred massive financial losses and serious casualties. Most of such damages could be identified with structural condition assessment, and therefore crack propagation in and total collapse of the structure can be prevented by taking rehabilitation measures. The fact that in seismic prone regions where the occurrence of minor and local damages could lead to the total collapse of the structure increases the importance of structural health monitoring substantially. Hence, determining the damages in structures in order to monitor structural health, increase the safety of the structure, and determining the current condition of the structure seems vital. In this research, spectral strain energy is considered as an index for determining the location of the damage. By making a comparison between the spectral strain energy of healthy structure and damaged structure, damaged elements can be identified. In addition, the capability of the aforementioned method in the linear and nonlinear regimes will be assessed. To demonstrate the efficiency of the adopted procedure, numerical examples are provided whose results indicate precision and suitable performance of the proposed method in identifying damages in structures.

کلیدواژه‌ها [English]

  • Damage detection
  • structural health monitoring
  • Spectral strain energy
  • Moment resistance frame
  • Damaged element
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