اعتبار،چابکی،پاسخگویی

مقایسه‌ی عملکرد لرزه ای سازه‌های فولادی دارای مهاربندهای نوین با آموزش مدلسازی المان محدود در نرم‌افزار آباکوس

نوع مقاله : مقاله پژوهشی

نویسنده

دانشجوی دکتری، دانشکده مهندسی عمران، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران، ایران.

چکیده
استفاده از سیستم‌های مهاربندی نوین در سازه های فولادی، از روش‌های رایج در افزایش سختی جانبی سازه است. مهاربندها ضمن کاهش جابجایی سازه‌ی فولادی، به افزایش استهلاک انرژی حین زلزله و طوفان‌های شدید نیز کمک زیادی می‌کنند. امکان تعمیر، تجهیز و در صورت نیاز، تعویض آن‌ها پس از وقوع زلزله و طوفان‌های شدید و بروز خرابی در مهاربندها، از جمله مزایای این نوع سیستم‌های استهلاک انرژی محسوب می‌شود. ارزیابی عملکرد مهاربندهای جدید، با استفاده از روش‌های تحلیلی مختلف، مزایا و معایب آن‌ها را نشان خواهد داد. لذا در پژوهش حاضر، قاب‌های فولادی با مهاربندهای قطری، شورون، دروازه‌ای، زانویی، لوزی و ضربدری با روش المان محدود و نرم‌افزار آباکوس طراحی شدند. سازه‌های فولادی مهاربندی شده، تحت تحلیل مودال در حوزه‌ی فرکانسی قرار گرفته و 50 مود ارتعاشی آن‌ها بررسی شد. نتایج نشان داد از نظر پارامترهای عملکردی مودال شامل تنش وون‌میزس، جابجایی سازه، فرکانس ویژه و جرم تعمیم‌یافته، به ترتیب مهاربندهای لوزی (26/26% کاهش نسبت به میانگین عددی سایر مهاربندها)، دروازه‌ای (19/51% کاهش)، لوزی (12/77% کاهش) و زانویی (11/11%)، بهترین عملکرد را داشتند. همچنین، قاب‌های فولادی مهاربندی شده در پارامتر ضریب مشارکت دورانی در جهات افقی، عمودی و قائم به ترتیب با مهاربند محوری (0/079) مهاربند محوری (0/088) و مهاربند زانویی (0/051)، بهترین عملکرد را داشتند.

کلیدواژه‌ها

موضوعات

عنوان مقاله English

Comparison of Seismic Performance of Steel Structures with Modern Braces with Finite Element Modeling Training in ABAQUS Software

نویسنده English

Masoud Mahdavi
PhD student, Faculty of Civil Engineering, K. N. Toosi University of Technology, Tehran. Iran.
چکیده English

The use of modern bracing systems in steel structures is a common method for increasing the lateral stiffness of the structure. Braces, while reducing the displacement of the steel structure, also contribute greatly to increasing energy dissipation during earthquakes and severe storms. The possibility of repairing, equipping and, if necessary, replacing them after earthquakes and severe storms and damage to the braces is considered one of the advantages of this type of energy dissipation systems. Evaluating the performance of new braces using different analytical methods will show their advantages and disadvantages. Therefore, in the present study, steel frames with diagonal, chevron, gate, knee, rhombus and cross braces were designed using the finite element method and Abaqus software. The braced steel structures were subjected to modal analysis in the frequency domain and their 50 vibration modes were investigated. The results showed that in terms of modal performance parameters including von Mises stress, structural displacement, specific frequency and generalized mass, rhombus braces (26.26% reduction compared to the numerical average of other braces), gate (19.51% reduction), rhombus (12.77% reduction) and knee (11.11%) had the best performance, respectively. Also, the braced steel frames had the best performance in the rotational participation factor parameter in the horizontal, vertical and perpendicular directions with axial brace (0.079), axial brace (0.088) and knee brace (0.051), respectively.

کلیدواژه‌ها English

  • Steel Structure
  • Structural Bracing System
  • Finite Element Method
  • Modal Analysis in the Frequency Domain
  • Modeling by Abaqus
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  • تاریخ دریافت 11 شهریور 1404
  • تاریخ بازنگری 14 شهریور 1404
  • تاریخ پذیرش 15 مهر 1404
  • تاریخ اولین انتشار 15 مهر 1404
  • تاریخ انتشار 01 دی 1404