تأثیر شرایط مرزی بر عملکرد لرزه‌ای خارج از صفحه میان‌قاب مصالح بنایی با در نظر گرفتن اندرکنش رفتار داخل صفحه

نوع مقاله : مقاله پژوهشی

نویسندگان

• جلیل شفائی ¹
• دلارام استاد ²

¹ دانشکده مهندسی عمران، دانشگاه صنعتی شاهرود، شاهرود، ایران.

² دانشکده مهندسی عمران، دانشگاه صنعتی شاهرود، شاهرود، ایران

10.22067/jfcei.2024.79409.1187

چکیده

خسارت‌های مشاهده شده در طی زمین لرزه‌های گذشته، نشان می‌دهد آسیب دیدگی میان‌قاب‌ها در داخل صفحه و کاهش سطح تماس میان‌قاب و قاب پیرامونی منجر به افزایش آسیب‌پذیری در خارج‌ از صفحه می‌شود. با توجه به شرایط متفاوت تماس میان‌قاب با قاب بتنی پیرامونی، اند‌رکنش و تأثیر رفتار خارج از صفحه برروی رفتار داخل صفحه یکی از موضوعات جدید در زمینه بررسی عملکرد لرزه‌ای میان‌قاب‌های مصالح بنایی می‌باشد. در این مقاله، تأثیر شرایط مرزی مختلف میان‌قاب با قاب بتن مسلح که عبارتند از چهار لبه متکی به قاب، سه لبه متکی به قاب، دو لبه افقی متکی به قاب و یک لبه متکی به قاب، با تحلیل سه نوع بارگذاری که عبارتند از: 1- بارگذاری خارج از صفحه تنها، 2- بارگذاری خارج از صفحه بعد از بارگذاری داخل صفحه، 3- بارگذاری داخل صفحه بعد از بارگذاری خارج از صفحه با استفاده از نرم افزار اجزای محدود ABAQUS ارزیابی شده است. نتایج نشان داد که عدم وجود اتصال مناسب بین ساختار قاب و میان‌قاب آسیب پذیری در جهت خارج از صفحه را افزایش می‌دهد و از فروپاشی آن‌ها جلوگیری نمی‌کند. آسیب قبلی ناشی از بارگذاری داخل صفحه که به حداکثر جابه‌جایی نسبی 3% رسیده است، می‌تواند حدود 70 درصد ظرفیت خارج از صفحه میان‌قاب را کاهش دهد؛ در نتیجه مقاومت و سختی تحت تاثیر شرایط مرزی و نوع بارگذاری قرار گرفته‌اند.

کلیدواژه‌ها

• میان‌قاب مصالح بنایی
• اندرکنش داخل و خارج از صفحه
• شرایط مرزی
• تحلیل اجزای محدود

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عنوان مقاله [English]

The Effect of the Boundary Conditions on the Seismic Performance of Out-of-Plane Masonry Infill by Considering In-Plane Behavior Interaction

نویسندگان [English]

• Jalil Shafaei ¹
• Delaram Ostad ²

¹ Shahrood University of Technology, Shahrood, Iran.

² Shahrood University of Technology, Shahrood, Iran.

چکیده [English]

The observed damage during the past earthquakes shows that the damage of the masonry infill in the in-plane and the reduction of the contact surface between the masonry infill and the surrounding frame led to an increase in the vulnerability out-of-plane. Considering the different contact conditions of the masonry infill with the surrounding concrete frame, the interaction, and influence of the out-of-plane on the in-plane behavior of the masonry infills, which is a new topic in the field of seismic performance of the masonry infills. In this paper, the effect of different boundary conditions the masonry infill and the reinforced concrete frame, which include four edges supported by the frame, three edges supported by the frame, two horizontal edges supported by the frame, and one edge supported by the frame, by analyzing three types of loading, which are: 1-out-of-plane loading only, 2-the out-of-plane loading after in-plane loading, 3-the in-plane loading after out-of-plane loading, have been evaluated by using the finite element software ABAQUS. The results demonstrated that the absence of proper connection between the frame structure and the infill increases the Out-of-plane direction vulnerability, and does not prevent their collapse. Previous damage due to in-plane loading, which reached a maximum drift of 3%, can reduce about 70% of the out-of-plane capacity of the infill frame and consequently, the strength and stiffness were affected by the boundary conditions and type loading.

کلیدواژه‌ها [English]

• Masonry infill
• In-plane and out-of-plane interaction
• Boundary condition
• Finite element analysis

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