ارزیابی رفتار لرزه‌ای قاب‌ بتن مسلح پیش‌ساخته آسیب دیده در زلزله بجنورد با لحاظ اندرکنش خاک-سازه

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران، دانشکده مهندسی، دانشگاه بجنورد، بجنورد، ایران

2 گروه آموزشی عمران، دانشکده مهندسی، دانشگاه بجنورد، بجنورد، ایران

3 مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه بجنورد، بجنورد، ایران

چکیده

رخ‌دادهای لرزه‌ای اخیر نشان‌دهنده تأثیر قابل ملاحظه اندرکنش-خاک سازه و همچنین رفتار اتصالات تیر به ستون بر پاسخ لرزه‌ای ساختمان‌های بتن مسلح پیش‌ساخته است. از این رو در این پژوهش، تأثیر اندرکنش خاک-سازه و مدل‌سازی اتصالات تیر به ستون بر آسیب‌پذیری ساختمان پنج طبقه بتن مسلح پیش‌ساخته اجرا شده در شهر بجنورد و واقع بر خاک نوع II ارزیابی شده است. مدل‌های عددی با لحاظ اثر اندرکنش خاک-سازه و رفتار غیرخطی اتصالات تیر به ستون، توسط نرم‌افزار Opensees ساخته شده‌اند. برای لحاظ اثر اندرکنش غیرخطی خاک-سازه از مدل تیر واقع بر بستر غیرخطی وینکلر (BNWF) استفاده شده است. در مدل بستر غیرخطی وینکلر از فنرهای قائم q-z برای بیان مقاومت قائم و دورانی شالوده سطحی استفاده شده است و مقاومت اصطکاکی خاک نیز در این مدل در نظر گرفته شده است. از روش تحلیل استاتیکی غیرخطی، تحلیل تاریخچه زمانی غیر خطی و همچنین تحلیل دینامیکی افزایشی جهت ارزیابی عملکرد و آسیب‌پذیری لرزه‌ای ساختمان‌های پیش‌ساخته استفاده گردیده است. همچنین مدل‌سازی رفتار اتصال تیر-ستون نیز با استفاده از یک مدل غیرخطی پیشنهادی انجام شده است. نتایج بدست آمده حاکی از آن است که لحاظ اثرات اندرکنش خاک-سازه و رفتار غیرخطی اتصالات تیر به ستون در ساختمان پیش‌ساخته مورد بررسی در این تحقیق، منجر به افزایش دوره تناوب و کاهش برش پایه نسبت به مدل بدون لحاظ این اثرات می‌گردد. با این وجود نتایج تحلیل حاکی از آن است که مدل‌سازی رفتار اتصالات تیر به ستون پیش‌ساخته منجر به کاهش سطح عملکرد و افزایش احتمال فروریزش ساختمان‌های پیش‌ساخته می‌شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Seismic Behavior Assessment of RC Precast Frame Damaged in Bojnord Earthquake 2017 Considering Soil-Structure Interaction Effects

نویسندگان [English]

  • Mahdi Adibi 1
  • Alialbar Yahyaabadi 2
  • Roozbeh Talebkhah 3
1 School of Civil Engineering, Faculty of Engineering, University of Bojnord, Bojnord, Iran
2 School of Civil Engineering, Faculty of Engineering, University of Bojnord, Bojnord, Iran
3 Department of Civil Engineering, Faculty of Engineering, University of Bojnord, Bojnord, Iran
چکیده [English]

Experiences of previous earthquakes show the effects of soil-structure interaction and behavior of beam-column connections on the seismic behavior of the building structures. In this research, seismic vulnerability assessment of RC precast Frames is investigated by consideration of the effect of soil-structure interaction and nonlinear behavior of beam-column connections. The RC precast building represented in this study, damaged in the Bojnord earthquake 2017 and located on the soil type II of Iranian seismic design code. The soil-structure interaction is modeled using the Beam-on-Nonlinear-Winkler foundation. In this procedure, an array of vertical q–z springs are used to capture vertical and rotational resistance of the foundation, while two springs, namely p–x and t–x, are placed horizontally to capture the passive and sliding resistance of the foundation, respectively. The seismic vulnerability and performance of RC precast frames are evaluated using nonlinear static pushover, nonlinear dynamic time-history analyses, and incremental dynamic analyses (IDA). The numerical models are developed using OpenSees software by consideration of the nonlinear behavior of the beam-column joints. The numerical results showed the significant role of soil-structure interaction and beam-column connections on the seismic vulnerability and performance of RC precast buildings. In fact, seismic vulnerability of RC precast buildings was increased by considering soil-structure interaction and beam-column connections effects.

کلیدواژه‌ها [English]

  • RC precast frames
  • Soil-structure interaction
  • Beam-Column Connections
  • incremental dynamic analyses
  • seismic fragility curve
 
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