تأمین ملاحظات طراحی لرزه‌ای قاب‌های خمشی کوتاه مرتبه بتن مسلح با شکل‌پذیری زیاد به کمک تحلیل غیرخطی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، گروه مهندسی عمران، دانشگاه آزاد اسلامی، واحد علوم تحقیقات، تهران، ایران

2 دانشیار، پژوهشگاه بین المللی زلزله شناسی ومهندسی زلزله، تهران، ایران

چکیده

به طور سنتی، طراحی لرزه‌ای ساختمان‌ها بر اساس معیارهای نیرو می‌باشد. در  طراحی با استفاده از آیین­ نامه‌های الاستیک، مقدار خسارت بسیار زیاد بوده زیرا روش الاستیک طراحی لرزه­ای نتوانسته است بینشی در مورد چگونگی رفتار سازه در طول زلزله ارائه دهد. رویکرد اصلی این پژوهش نشان دادن این موضوع است که با توزیع مناسب مقاومت برشی با استفاده از تحلیل غیرخطی در اجزاء، طبقات و کل ساختمان می‌توان شرایطی را فراهم نمود که خرابی ساختمان در زلزله‌های قوی به حداقل ممکن برسد. همچنین نشان داده می‌شود که انتخاب نوع تحلیل در دست یافتن به توزیع مقاومت بهینه مناسب نقش به سزایی خواهد داشت. برای رسیدن به چنین الگویی از یک قاب با سیستم قاب خمشی ویژه به عنوان مدل اصلی، استفاده شده‌است، که در ابتدای امر به وسیله تحلیل استاتیکی خطی طراحی شد، سپس الگوی توزیع مقاومت بهینه قاب مذکور به کمک تحلیل دینامیکی غیرخطی مکرر بر روی ساختمان، برای طراحی قاب اصلی با دقت مناسبی تخمین زده شد و مقاطع ساختمان تعیین شد. سپس ساختمان‌های طراحی شده با توزیع‌ مقاومت تخمین زده شده و توزیع پیشنهادی آیین ­نامه با استفاده از تحلیل تاریخچه زمانی غیرخطی تحت مجموعه ۲۲ تایی از حرکات دور و نزدیک گسل مورد ارزیابی و مقایسه قرار گرفتند و در نهایت بهترین نوع تحلیل در طراحی لرزه­ای ساختمان‌های بتنی با شکل­ پذیری زیاد در مناطق دور و نزدیک گسل انتخاب شد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Providing Seismic Design Considerations of Low-Rise High Ductility Reinforced Concrete Frames Using Nonlinear Analysis

نویسندگان [English]

  • Sara Naghavi 1
  • abdolreza sarvghad moghadam 2
  • MohammadReza Mansoori 1
1 M.Sc. student Department of Civil Engineering Science and Research Branch Islamic Azad University
چکیده [English]

Traditionally, the seismic design of buildings has been based on strength criteria. In design using elastic codes, the damage was very high because the elastic method of seismic design has failed to provide insight into how the building behaves during earthquakes. The main approach of this research is to show that with proper distribution of shear strength of components, storiesو and the whole building, using nonlinear analysis, it is possible to provide a situation that minimizes the building damages in strong earthquakes. Moreover, it is shown that selecting the type of analysis will play an important role in determining the optimal strength distribution. To achieve such a pattern, a frame with a special moment frame system was used as the main model, which was initially designed by linear static analysis, then the optimal strength distribution pattern of the frame was estimated with proper accuracy by repetitive nonlinear dynamic analysis on the building and the structure sections were determined. Then, the buildings, which were designed according to the estimated strength distribution and the code proposed distribution, were evaluated and compared using nonlinear time history analysis under a set of 22 near-fault and far-fault motions. Finally, the best analysis type in the seismic design of high ductility concrete buildings in near-fault and far-fault regions was select.

کلیدواژه‌ها [English]

  • High Dductility Reinforced Concrete Frames
  • Linear Analysis
  • Nonlinear Analysis
  • Optimal Strength Ddistribution Pattern
  • Far- fault and Near-fault motions

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 53، شماره 4
تیر 1400
صفحه 1525-1544

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