مهندسی سازه و ساخت

مهندسی سازه و ساخت

بررسی آزمایشگاهی و عددی رفتار خارج از صفحه دیوارهای بنایی AAC مقاوم‌سازی‌شده با ژئوگرید و کلاف فولادی تحت بارگذاری چرخه‌ای

نوع مقاله : علمی - پژوهشی

نویسندگان
1 دانشجوی دکتری، گروه عمران، واحد مهاباد، دانشگاه آزاد اسلامی، مهاباد، ایران
2 دانشیار، دانشکده مهندسی عمران، دانشگاه تبریز، تبریز، ایران
3 استادیار،گروه عمران، ,واحد مهاباد، دانشگاه آزاد اسلامی، مهاباد، ایران
4 استاد، دانشکده فنی و مهندسی، دانشگاه آزاد اسلامی واحد مهاباد، مهاباد، ایران
10.22065/jsce.2025.526315.3749
چکیده
سازه‌های بنایی از جمله سیستم‌های رایج در مهندسی عمران هستند که در سال‌های اخیر مقاوم‌سازی آن‌ها با روش‌های نوین مورد توجه قرار گرفته است. در این پژوهش، عملکرد خارج از صفحه دیوارهای بنایی میا‌ن‌قاب ساخته شده از بلوک هوادار اتوکلاوشده (AAC) مورد بررسی قرار گرفت. در این راستا دو روش مقاوم‌سازی با استفاده از کلاف فولادی قائم و لایه‌های ژئوگرید ارزیابی شدند. بدین منظور چهار نمونه دیوار با ابعاد طول دهانه 3 متر، ارتفاع 65/2 و ضخامت 2/0 ساخته شد؛ دیوار اول به ‌عنوان نمونه شاهد و سه نمونه دیگر به روش‌های مختلف مقاوم‌سازی شدند. برای مقاوم‌سازی در نمونه دوم از پروفیل‌های نبشی فولادی در محل گوشه‌های دیوار استفاده شد و در نمونه‌های سوم و چهارم، لایه‌های ژئوگرید به عرض ۵۵ سانتی‌متر در ابتدا و انتهای دهانه دیوار نصب گردید. در نمونه چهارم، علاوه بر نصب لایه‌های ژئوگرید، بلوک‌ها با استفاده از تسمه‌های فولادی در رج‌های افقی به یکدیگر متصل شدند. در ادامه بارگذاری چرخه‌ای خارج از صفحه در بالای دیوار و در میانه دهانه اعمال شد و الگوی ترک‌خوردگی و نمودار بار-جابجایی هر یک از نمونه‌ها بدست آمد. به منظور بررسی عددی هر یک از روش‌های مقاوم‌سازی، شبیه‌سازی عددی به روش میکرو در نرم‌افزار ABAQUS انجام شد. نتایج نشان داد استفاده از کلاف فولادی قائم مقاومت خارج از صفحه دیوار را تا ۴ برابر افزایش داده و جذب انرژی را نیز بهبود می‌بخشد، در حالی‌که ژئوگرید بیشتر موجب افزایش شکل‌پذیری و جذب انرژی شده و تأثیر کمتری بر افزایش مقاومت داشته است.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Experimental and Numerical Investigation of Out-of-Plane Behavior of AAC Masonry Infill Walls Reinforced with Geogrid and Steel Frames under Cyclic Loading

نویسندگان English

Rezgar Boukani 1
Masood Farzam 2
Kaveh Nezamisavojbolaghi 3
Alaedin Behravesh 4
1 Ph.D. candidate, Department of Civil Engineering, Mah.c., Islamic Azad University, Mahabad, Iran
2 Associate Professor, Faculty of Engineering, University of Tabriz, Tabriz, Iran
3 Assistant Professor, Department of Civil Engineering, Mah.c., Islamic Azad University, Mahabad, Iran
4 Professor, Faculty of Engineering, Mah. C, Islamic Azad University, Mahabad, Iran
چکیده English

Masonry structures are among the most common systems in civil engineering, and in recent years, their retrofitting using modern techniques has received significant attention. This study investigated the out-of-plane performance of infill masonry walls constructed with autoclaved aerated concrete (AAC) blocks. Two strengthening methods were evaluated: vertical steel Frame and geogrid layers. For this purpose, four wall specimens with a span length of 3 meters, a height of 2.65 meters, and a thickness of 20 cm were constructed. The first wall was a control specimen, while the remaining three were strengthened using different techniques. In the second specimen, steel angle profiles were installed at the corners of the wall. In the third and fourth specimens, 55 cm wide geogrid strips were applied at both ends of the wall span. In the fourth specimen, steel straps were used to connect the AAC blocks along horizontal courses. Out-of-plane cyclic loading was applied at the top and mid-span of each wall, and the crack propagation patterns and load-displacement responses were recorded. Micro-modeling was conducted in ABAQUS to assess each strengthening technique's effectiveness numerically. The results showed that vertical steel ties increased the out-of-plane strength up to four times and significantly improved energy dissipation. In contrast, geogrid layers mainly enhanced ductility and energy absorption, with a relatively minor effect on strength.

کلیدواژه‌ها English

AAC infill wall
out-of-plane behavior
vertical steel frame
geogrid
crack propagation pattern
"
load-displacement curve."
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  • تاریخ دریافت 13 تیر 1404
  • تاریخ بازنگری 20 مهر 1404
  • تاریخ پذیرش 26 آذر 1404