عملکرد لرزه‏ای مهاربندهای کمانش‏تاب در ساختمان‏های بتن‏آرمه نامنظم در معرض زلزله‏های متوالی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی عمران، دانشگاه تفرش، تفرش، ایران

2 دانشکده مهندسی عمران، دانشگاه تفرش، تفرش، ایران گروه پژوهشی تحلیل کمی و کیفی سیالات و محیط زیست، دانشگاه تفرش، تفرش، ایران.

چکیده

در این پژوهش، عملکرد لرزه‌ای سازه‌های بتن‌آرمه نامنظم مجهز به مهاربندهای کمانش‌تاب در برابر زلزله‌های متوالی مورد بررسی قرار گرفته است. پدیده‌ی توالی لرزه‌ای به وقوع چند زلزله‌ی پی‏ درپی شامل پیش‏ لرزه-لرزه اصلی و یا لرزه اصلی-پس‏ لرزه در بازه‌ی زمانی کوتاه اشاره دارد که اثر تجمعی آن‌ها می‌تواند پاسخ سازه را به‌طور چشمگیری نسبت به یک زلزله‌ی منفرد تغییر دهد. در این راستا، سه مدل سازه‌ی سه، شش و نه‌ طبقه براساس ضوابط آیین‌نامه‌ی ۲۸۰۰ ایران طراحی و پس از صحت‌ سنجی تحت تحلیل دینامیکی غیرخطی در محیط نرم افزاری OpenSees قرار گرفتند. مقایسه‌ی پاسخ قاب‌های مورد مطالعه تحت تحریک‌های لرزه‌ای منفرد و متوالی نشان داد که استفاده از مهاربندهای کمانش‌ تاب موجب بهبود توزیع نیروی جانبی، افزایش شکل‌پذیری در طبقات فوقانی (به طور متوسط حدود 32%) و کاهش ابعاد مقاطع تیر و ستون می‌شود. همچنین در قاب‌های دارای تعداد کمتر مهاربند، جابه‌جایی پسماند و کرنش‌های غیرالاستیک به طور متوسط حدود 47% افزایش یافته و افزایش شاخص خسارت تا 2 برابر مشاهده شده است. در مجموع، نتایج بیانگر آن است که مهاربندهای کمانش‌تاب با فراهم‌سازی ظرفیت بالای جذب انرژی و رفتار پایدار هیسترزیس، گزینه‌ای قابل اعتماد برای بهبود عملکرد لرزه‌ای سازه‌های نامنظم بتن‌آرمه در برابر زلزله‌های متوالی هستند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Seismic Performance of Buckling-Restrained Braces in Irregular Reinforced Concrete Buildings under Successive Earthquakes

نویسندگان [English]

  • Mohammad Fardkakaei 1
  • Elham Rajabi 2
1 Qualitative and Quantitative Analysis of Fluids and Environmental Research Group, Department of Civil Engineering, Tafresh University, Tafresh 39518-79611, Iran
2 Qualitative and Quantitative Analysis of Fluids and Environmental Research Group, Department of Civil Engineering/ Tafresh University/ Tafresh/ Ian.
چکیده [English]

This study evaluates the seismic performance of irregular reinforced concrete (RC) structures equipped with buckling-restrained braces (BRBs) under successive earthquakes involved foreshock-mainshock and mainshock-aftershock. Seismic sequence phenomenon refers to the occurrence of multiple shocks in a short time interval, whose cumulative effects can significantly change the structural response compared to a single shock. In this regards, three RC frames with 3, 6, and 9 stories were designed based on the Iranian Code 2800. Nonlinear dynamic analyses were conducted in OpenSees after verification of the studied frames based on reference model. Comparison of the response of frames under single and successive shocks indicate that BRBs improve lateral force distribution, increased ductility in the upper stories (up to 32%), and reduced beam and column cross-section dimensions. Also, residual displacements and inelastic strains have been increased about 47% in frames with fewer BRBs. Moreover, increased damage has been observed up to two times. Generally, the results indicate that buckling braces are a reliable option for improving the seismic performance of irregular reinforced concrete structures under successive earthquakes due to providing high energy absorption capacity and stable hysteresis behavior.

کلیدواژه‌ها [English]

  • Buckling Restrained Brace
  • Reinforced Concrete Structures
  • Seismic Sequence Phenomenon
  • Irregularity
  • Nonlinear Dynamic Analysis

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 57، شماره 9
آذر 1404
صفحه 1619-1642

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