بکارگیری روشی نوین به منظور کاهش اثرات مود های بالاتر در سیستم های گهواره ای مهاربندی مرکز گرا

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشجوی دکتری مهندسی سازه، گروه مهندسی عمران، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران

2 استادیار،گروه مهندسی عمران، واحد علوم و تحقیقات، دانشگاه آزاداسلامی،تهران،ایران

3 دانشیار، پژوهشگاه بین المللی زلزله شناسی و مهندسی زلزله، تهران، ایران

4 استادیار، گروه مهندسی عمران ، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی ، تهران، ایران.

چکیده

سیستم‌های نوین آسیب‌گریز جزء سازه‌های نوین لرزه‌بر جانبی محسوب می‌شوند. این سازه‌ها جابجایی پسماند حداقل دارند و نیز انرژی زلزله را از طریق فیوز‌های تعویض‌پذیر جذب می‌کنند. سیستم‌های مهاربندی مرکزگرای گهواره‌ای که در این تحقیق مورد بررسی قرار گرفته‌اند جزء این سیستم‌های نوین لرزه‌ای محسوب می شوند. در سازه‌های گهواره‌ای مرکزگرا و نیز دیگر سازه‌های بلند، اثر مودهای بالاتر می‌تواند خسارات جبران ناپذیری را در سازه ایجاد نماید. در این تحقیق سعی شده است که با استفاده از ستون‌ها و مهاربند‌های کمانش‌تاب به عنوان فیوز جاذب انرژی به جای ستون‌ها و مهاربند‌های متداول آیین‌نامه‌ای در سازه‌های گهواره‌ای مهاربندی مرکزگرا، اثرات مود‌های بالاتر کاهش یابد. پنج سازه 12 طبقه مورد بررسی قرار گرفت که شامل؛ سیستم مهاربندی پایه-گهواره‌ای مرکزگرا و 4 نوع با قرار گیری ستون و مهاربند کمانش‌تاب در پایه، یک‌سوم، میانه و سه‌چهارم ارتفاع، هستند. برای بررسی رفتار لرزه‌ای این سازه‌ها، مدل‌سازی‎ها در نرم‌افزار OpenSees به‌صورت دوبعدی انجام شده است و سپس تحت 22 رکورد دور از گسل مطابق FEMA P695 مورد بررسی قرار گرفته اند. رفتار غیرخطی هندسی و مصالح در مدل‌سازی در نظر گرفته شده است. نتایج نشان دهنده بهبود عملکرد لرزه‌ای و کاهش اثرات مودهای بالاتر در حالت استفاده از مهاربندها و ستون‌های کمانش‌تاب در طبقات، در مقایسه با حالت سیستم مهاربندی گهواره‌ای مرکزگرای متداول است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Using a new method in order to reduce the effects of higher modes in self-centering rocking steel brace frame systems

نویسندگان [English]

  • farzad raeiszadeh 1
  • mohammad Reza Mansoori 2
  • Abdolreza Sarvghad Moghadam 3
  • armin aziminejad 4
1 Ph.D. Student in Structural Engineering, Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
2 Assistant professor, Department of Civil Engineering, Science and Research Branch, Islamic Azad University Tehran, Iran
3 Associate Professor, International Institute of Earthquake Engineering and Seismology, Tehran, Iran
4 Assistant professor Department of Civil Engineering Science and Research Islamic A zad university Tehran.Iran
چکیده [English]

Modern damage-free systems are part of modern lateral seismic structures. These structures have minimal residual displacement and dissipate earthquake energy through replaceable fuses. self -centering rocking steel braced frame systems that have been investigated in this research are considered among these modern seismic systems. In self-centering rocking structures as well as other tall structures, the effect of higher modes can cause irreparable damages in the structure. In this research, an attempt has been made to reduce the effects of higher modes by using buckling restrained columns and braces (BRCs and BRBs) as energy dissipating fuses instead of standard columns and braces in self -centering rocking structures. Five 12-story structures were investigated, including;self -centering rocking steel braced frame system and four other structure with placement of BRBs and BRCs at the base, one-third, middle and three-quarter of the height. To investigate the seismic behavior of these structures, several analyses has been performed in OpenSees software under 22 far field records according to FEMA P695. Geometric and material nonlinearities is considered in the modeling. The results show the improvement of the seismic performance and the reduction of the effects of higher modes in the case of using BRBs and BRCs in the stories, compared to the case of the common self-centering rocking bracing system.

کلیدواژه‌ها [English]

  • Self-Centering System
  • Rocking Bracing Frame
  • Nonlinear
  • Dynamic Analysis
  • Residual Displacement
  • Effect of Higher Modes
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