بررسی پاسخ لرزه ای ساختمان های بلندمرتبه فولادی دارای اسکلت پیرامونی متشکل از پانل های پیوسته مهاربندی شده تحت اثر رکوردهای حوزه نزدیک

نوع مقاله : Articles

نویسندگان

1 دانشگاه خوارزمی، تهران، ایران

2 گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه خوارزمی، تهران، ایران

3 پژوهشکده مهندسی سازه، پژوهشگاه بین‌المللی زلزله‌شناسی و مهندسی زلزله، تهران، ایران

چکیده

سیستم سازه­ای قاب محیطی مهاربندی­شده، یکی از ساختارهای بسیار مناسب برای مقاومت در برابر بارهای ناشی از زلزله است. این سیستم دارای ویژگی­های عملکرد لرزه­ای بسیار مناسبی بوده و قابلیت­های مقاومتی اسکلت ساختمان­های بلندمرتبه را نیز به‌صورت چشمگیری نسبت به کاربرد ساختارهای سه‌بعدی قاب خمشی افزایش می­دهد. پژوهش حاضر، دربرگیرنده نتایج مطالعه ویژگی­های رفتار لرزه­ای حاصل از کاربرد  چهار سیستم مقاوم قاب محیطی مهاربندی ­شده در ساختمان­های بلند با پیکربندی20 طبقه تحت اثر رکوردهای نیرومند حوزه نزدیک است. دو سازه مطالعاتی دارای آرایش پانل­های متمرکز مهاربندی شده و دو سازه دیگر نیز دارای سیستم مهاربندهای بزرگ‌مقیاس می­باشند. به‌منظور تعیین پارامترهای پاسخ سازه­های مطالعاتی، تعداد زیادی تحلیل دینامیکی غیرخطی تاریخچه زمانی صورت پذیرفت. بررسی تحلیلی پارامترهای پاسخ حاصله، نشان­گر عملکرد لرزه­ای خوب اسکلت‌های مهاربندی­شده تحت اثر رکوردهای حوزه نزدیک است.ملاحظه شد که به‌کارگیری آرایش­های متمرکز مهاربندی در یک تعداد محدود و هم­راستا از پانل­های سیستم مقاوم قاب محیطی در اسکلت ساختمان­های بلند، چندان مناسب نیست. همچنین دانسته شد که پارامتر­های پاسخ لرزه­ای غیرخطی مربوط به مدل20 طبقه با آرایش متمرکز پانل­های مهاربندی شده، نسبت به مدل متناظر20 طبقه دارای مهاربندهای بزرگ، دچار تغییرات گسترده­تری می­شود. کاربرد المان­های منفرد و نیز همگرای مهاربندی در پانل­های پیرامونی یک سازه قاب محیطی مهاربندی­شده، به‌تنهایی نمی­تواند در کنترل حداکثر تغییر مکان جانبی و دریفت طبقات مؤثر باشد. سیستم قاب محیطی با مهاربندهای بزرگ‌مقیاس، دارای عملکرد بهتری از نظر کنترل آسیب­پذیری و بهبود پارامترهای پاسخ لرزه­ای نسبت به سیستم­های مهاربندی­شده منظم در ارتفاع سازه، است.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of Seismic Response of Tall Buildings comprised of Braced Tube Skeleton with Contiguous Braced Panels Configuration Subjected to Nearfield Records

نویسندگان [English]

  • Farshad Barati 1
  • Marzie Heydari 1
  • Afshin Meshkat-Dini 2
  • Abdolreza Sarvghad-Moghadam 3
1 Kharazmi University, Faculty of Engineering, Tehran, Iran
2 Department of Civil Engineering, Faculty of Engineering, Kharazmi University, Tehran, Iran
3 Structural Engineering Research Center, International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran
چکیده [English]

The braced tube structure is one of the most efficient lateral load resistant skeletal systems under seismic loads. This high-rise mega frame has desirable aspects in terms of seismic response. Also, this system increases the resistance potential of high-rise structures in comparison with three-dimensional steel rigid frames. The present study denotes the seismic response properties of four mega braced tube structural systems of 20-story with different bracing configurations, which are the same in plan and loading arrangements, subjected to strong near-field records. The two studied structures have skeletal configuration of centralized braced panels. Moreover, the two other studied models were designed based on mega braced tube system considered as the resistant structure. In order to assess dynamic response parameters of the studied structures, several nonlinear time history analyses were performed. The selected earthquake records contain a variety of wave-like characteristics such as long period pulses and high amplitude spikes in the ground velocity and acceleration time histories. The analytical evaluation of seismic response parameters indicates the desirable performance of mega braced tube structural systems under powerful near-fault records.
The aforementioned seismic performances were investigated in terms of maximum lateral displacement, inter-story drift as well as absolute acceleration, relative velocity of floors and total base shear along with the integrated formations of skeletal nonlinear hinges. It was obtained that the concentrated configuration of a limited number of aligned braced panels in high-rise framed skeleton is not relatively suitable. Also, dynamic response parameters of the 20-story models with the configuration of centralized braced panels are influenced more while being subjected to near-field ground motions in comparison to the mega braced tube systems. The application of centralized braced panels would lead to the more intensive variation in seismic response parameters. It should be noted that the application of single elements as well as concentric aligned braced panels cannot be effective in controlling the maximum lateral displacement and drift demands. The structural vulnerability assessment indicated that mega braced tube structures have better seismic performance than the other type of resistant skeletons under influencing of large coherent velocity pulses which displayed in the time history of strong earthquake records.

کلیدواژه‌ها [English]

  • Braced Tube Frame
  • Perimeter Resistant Skeleton
  • Large Scale Braces
  • Nonlinear behavior
  • Near-Field Record
  • Velocity Pulse
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