بررسی پارامتریک عدم قطعیت در شاخص اعتماد سازه‌های قاب خمشی بتنی با استفاده از تحلیل دینامیکی افزایشی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی عمران، دانشگاه کردستان، سنندج، ایران

2 دانشکده مهندسی، دانشگاه صنعتی خاتم الانبیاء بهبهان، بهبهان، ایران

چکیده

چکیده: در سال‌های اخیر طراحی سازه‌ها بر اساس تئوری قابلیت اطمینان توجه بسیاری را به خود جلب کرده است. محققین روش‌های متفاوتی برای محاسبه شاخص اعتماد ارائه داده‌اند که هر کدام از نظر فرضیات، سادگی و یا دقت متفاوت هستند. با توجه به تنوع روش‌های موجود لازم است اثرات عدم قطعیت در هر روش به نحو مناسبی در نظر گرفته شود. در این پژوهش به کمک تئوری قابلیت اطمینان عدم قطعیت های ناشی از روش‌های انتخاب رکورد، در نظر گرفتن اثرات فروریزش در توزیع‌های آماری، روش‌های تخمین نیاز و ظرفیت لرزه ای و در نظر گرفتن عدم قطعیت های مبانی، بر ایمنی عملکردلرزه ای سازه‌های بتن آرمه در سطوح عملکردی بهره برداری، بهره برداری بی وقفه، ایمنی جانی و آستانه ی فروریزش بررسی می شود. نتایج نشان می‌دهد که در نظر گرفتن عدم قطعیت ناشی از روش‌های انتخاب رکورد بر نتایج شاخص اعتماد سازه‌ها تاثیر قابل ملاحظه دارد. همچنین در سطح عملکردی آستانه‌ی فروریزش، در نظر گرفتن اثرات فروریزش بر مقادیر شاخص اعتماد سازه‌ها ضروری به نظر می‌رسد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Parametric Assessment of Uncertainties in Reliability Index of Reinforced Concrete MRF Structures Using Incremental Dynamic Analysis

نویسندگان [English]

  • A. Yazdani 1
  • A. Mehrabi Moghaddam 1
  • M.S. Shahidzadeh 2
1 Department of Civil Engineering, University of Kurdistan, Sanandaj, Iran
2 Department of Engineering, Behbahan Khatam Alanbia University of Technology, Behbahan, Iran
چکیده [English]

Recently, increasing attention has been paid to reliability based design methods due to its ability to consider different uncertainties associated with demand and capacity. Recent studies show that presence of unaccounted uncertainty may inflict unacceptable bias to computation of reliability index.
Exact computations of global reliability index for multi-member structures are only possible through simulation methods. Therefore, researchers have proposed numerous methods using simplified assumption for reliability index calculation. Each method is different in the simplicity and accuracy it offers. For this purpose, in assessment of the effect of different uncertainty different methods of record selection for IDA analysis, probabilistic distribution of demand data and demand-capacity relation assumptions were used in this study to compute reliability index for “Operational”, “Immediate Occupancy”, “Life Safety” and “Collapse Prevention” limit states. The results showed that considering epistemic uncertainty in record selection and probabilistic distribution dramatically affects the reliability index and thus should be considered in future analyses.

کلیدواژه‌ها [English]

  • Uncertainty
  • Reliability Incremental Dynamic Analysis Conditional Mean Spectra Reinforced Concrete

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 49، شماره 4
اسفند 1396
صفحه 755-768

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