ارزیابی عملکرد لرزه ای سیستم قاب خمشی خرپایی ویژه با بخش ویژه ویراندیل

نوع مقاله : پژوهشی

نویسندگان

دانشکده‌ی مهندسی عمران، دانشکدگان فنی، دانشگاه تهران.

چکیده

در پژوهش حاضر، تأثیر تعداد طبقات و چشمه‌های بخش ویژه از نوع ویراندیل سیستم قاب خمشی خرپایی ویژه (STMF) در پارامترهای لرزه‌ای آن بررسی شده است‌. قاب‌های بررسی‌شده، شامل ۹ قاب: دو، پنج، و هشت ‌طبقه با بخش ویژه‌ی یک، دو، و سه‌ چشمه‌ای بوده است، که طراحی آن در نرم‌افزار ETABS صورت گرفته و تحلیل‌های غیرخطی بارافزون طبق ضوابط 695P FEMA و تاریخچه‌ی زمانی با اعمال 11 جفت شتاب‌نگاشت براساس آیین‌نامه‌ی 7-22 ASCE در نرم‌افزار OpenSees انجام شده است‌. نتایج نشان داده‌اند که شکل‌پذیری قاب‌ها با افزایش تعداد طبقات و چشمه‌های بخش ویژه، افزایش یافته و میانگین ضرایب اضافه مقاومت به‌دست‌آمده 5/2 بوده است، که به مقدار ۳ پیشنهادی آیین‌نامه نزدیک است. همچنین، مقادیر میانگین تغییرمکان جانبی طبقات کمتر از 2٪ و میانگین تغییرمکان پسماند حدود 15/0٪ بوده است، که در محدوده‌ی مجاز آیین‌نامه‌ است. در مجموع سیستم STMF مذکور، عملکرد مناسبی در برابر بارهای لرزه‌ای نشان داده است و می‌تواند گزینه‌ای مناسب برای طراحی سازه‌های با دهانه‌های بزرگ باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Evaluation of seismic performance of Special truss moment frames (STMF) with Vierendeel special segment

نویسندگان [English]

  • ََAlireza Mirzaei
  • Abazar Asghari
  • Amirreza Ghiami Azad
School of Civil Engineering, College of Engineering, University of Tehran, Iran‌.
چکیده [English]

In designing structures subjected to seismic forces, selecting an appropriate system based on seismic performance and building height is essential. Special Truss Moment Frames (STMF) are an innovative structural system designed to provide adequate lateral stiffness and control deformations. This system, combining steel trusses and columns instead of traditional beams, is highly efficient in absorbing lateral seismic forces, making it suitable for tall buildings and large spans. This study investigates the influence of the number of stories and the number of Vierendeel special segment panels in the STMF system on its seismic performance parameters. The analyzed models include nine cases with two, five, and eight stories, each designed with one, two, and three special segment panels. These models were developed in the ETABS software for preliminary design, while nonlinear analyses, including pushover and time history, were conducted in OpenSees. The pushover analysis was performed following FEMA P695 guidelines, and the nonlinear dynamic time history analysis was conducted based on ASCE 7 standards with 11 pairs of far-field ground motion records. The results highlight the high ductility of the STMF system, which increases with the number of stories and special segment panels, along with average over-strength factors of 2.5, which are close to the ASCE 7 recommended value of 3. The average transient story drift remained below 2%, while the average residual drift was approximately 0.15%, both within the permissible limits outlined in the code. Moreover, the models exhibit desirable seismic performance without any indications of non-compliance under severe seismic demands. In terms of design, increasing the number of panels in the special segment reduces the amount of structural steel required. This occurs because longer special segments result in lower expected shear forces, leading to smaller cross-sections for members outside the special segment. Conversely, models with shorter special segments demonstrate higher lateral stiffness and greater base shear capacities. Overall, this research confirms that the STMF system with Vierendeel special segments offers excellent seismic performance and can serve as a suitable and cost-effective option for designing structures with large spans.

کلیدواژه‌ها [English]

  • Special truss moment frame
  • vierendeel
  • pushover
  • time history
  • over-strength factor
  • ductility factor
  • drift

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