بررسی عملکرد لرزه‌ای میان‌قاب‌های مصالح بنایی بازشودار و بدون بازشو با در نظر گرفتن اندرکنش رفتار داخل و خارج‌ از صفحه و ارائه ضریب کاهش سختی مؤثر و مقاومت نهایی

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

دانشکده مهندسی عمران، دانشگاه صنعتی شاهرود

چکیده

قاب با میان‌قاب مصالح بنایی رایج­ترین نوع سازه‌ای است که برای ساخت سازه‌های چندطبقه در کشورهای در حال توسعه استفاده می‌شوند. اثر میان‌قاب مصالح بنایی عمدتاً باعث افزایش سختی اولیه و مقاومت ساختمان‌های قاب بتن مسلح (RC) است. از سوی دیگر، بازشوهای پنجره و درب به دلایل کاربردی جزء اجتناب ­ناپذیر میان‌قاب‌های مصالح بنایی هستند. مشاهده آسیب‌های زلزله‌های گذشته نشان می‌دهد که، آسیب­ دیدگی و خسارت میان‌قاب‌ها در داخل صفحه و کاهش سطح تماس میان‌قاب و قاب پیرامونی منجر به افزایش آسیب‌پذیری در خارج از صفحه میان‌قاب می‌شود. در این مقاله، قاب‌های میان‌پر با بازشو با ابعاد مختلف (پنجره و درب) تحت سه بارگذاری که عبارتند از: بارگذاری خارج از صفحه، بارگذاری خارج از صفحه بعد از بارگذاری داخل صفحه، بارگذاری داخل صفحه بعد از بارگذاری خارج از صفحه، با استفاده از نرم­ افزار اجزا محدود ABAQUS ارزیابی شده است. تحلیل‌های پوش ­آور غیرخطی برای هر یک از سه بارگذاری انجام شده است. بر اساس نتایج اجزای محدود موجود، معادلات تحلیلی برای به ­دست آوردن ضریب کاهش پیشنهاد شد. میانگین کاهش سختی میان‌قاب با در نظر گرفتن اندرکنش داخل صفحه و خارج از صفحه با استفاده از ضریب کاهش سختی 30 درصد محاسبه شد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigating the Seismic Performance of Masonry Infills with Opening and Non-Opening by Considering the Interaction of Behavior in Plane and Out of the Plane and Providing the Reduction Factor of Effective Stiffness and Ultimate Strength

نویسندگان [English]

  • Delaram Ostad
  • Jalil Shafaei
Faculty of Civil Engineering, Shahrood University of Technology, Shahrood, Iran
چکیده [English]

Masonry infills are an unavoidable member of any building. The presence of openings in a masonry infill alters its behaviour and reduces the load strength and stiffness of the infilled frame. Considering the reality of the masonry infill, the capacity of masonry infill is defined in two separate modes of in-plane (IP) force and out-plane (OOP) force (Asteris et al., 2017). In this paper, the main goal is to investigate masonry infills with different window and door openings with different dimensions and locations under three types of loading, which are: 1-Out-of-plane Loading of masonry infill under different accelerations. 2-Out-of-plane loading after in-plane loading at relative displacements (drift) of 0.5%, 1%, 2%, and 3% and check for Out-of-plane damage. 3-In-plane loading up to 6% relative displacement (drift) after out-of-plane loading and checking for in-plane damage. The numerical models are generated in finite element ABAQUS soft. Nonlinear pushover analyses have been conducted for each of the three loading. At the end, reduction factors of effective stiffness and ultimate strength are suggested. By using these suggested reduction factors, the design engineer can model the interaction effects in-plane and out-of-plane using the compression diagonal struts method. The average reduction of the infill stiffness was calculated by considering the interaction in-plane and out-of-plane 30%.

کلیدواژه‌ها [English]

  • Masonry infill
  • Opening
  • Out of plane loading
  • In plane loading
  • Finite element method
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