مهندسی سازه و ساخت

مهندسی سازه و ساخت

تقویت خارج از صفحه‍ی میان‍قاب‍های بنایی بازشودار با استفاده از نوارهای بتنی مسلح شده با الیافی فولادی

نوع مقاله : علمی - پژوهشی

نویسندگان
1 دانشجوی دکتری، گروه مهندسی عمران، واحد نجف‍آباد، دانشگاه آزاد اسلامی، نجف‍آباد، ایران
2 استادیار، گروه مهندسی عمران، واحد نجف‍آباد، دانشگاه آزاد اسلامی، نجف‍آباد، ایران
3 دانشیار، دانشکده مهندسی عمران و محیط زیست، دانشگاه صنعتی شیراز، شیراز، ایران
10.22065/jsce.2025.541406.3799
چکیده
در این مقاله نتایج حاصل از یک مطالعه‍ی آزمایشگاهی با هدف بررسی رفتار خارج از صفحه‍ی قاب‍های فولادی دارای میان‍قاب آجری بازشودار تقویت شده توسط نوارهای بتنی مسلح شده با الیاف فولادی ارائه شده است. برای این منظور، نمونه‍های آزمایشگاهی شامل سه نمونه‍ی بزرگ مقیاس قاب فولادی با میان‍قاب به ترتیب، نمونه با میان‍قاب مصالح بنایی متکی به قاب بدون تقویت (به عنوان نمونه‍ی مرجع)، میان‍قاب تقویت شده توسط نوارهای بتن الیافی در هر دو وجه دیوار و متکی به قاب و میان‍قاب تقویت شده توسط نوارهای بتن الیافی در هر دو وجه دیوار و جدا از قاب می‍باشند. بارگذاری خارج از صفحه به صورت بار استاتیکی فزاینده بوده است. طرح تقویتی پیشنهادی به صورت نوارهای بتنی الیافی به عرض 200 میلی‍متر و ضخامت 20 میلی‍متر می‍باشند. نتایج حاصل از آزمایش‍های انجام شده نشان می‍دهد که تقویت میانقاب توسط نوارهای بتن الیافی باعث افزایش سختی اولیه تا حدود 5/2 برابر برای حالت میان‍قاب چسبیده به قاب و حدود 8/1 برابر برای حالت جدا از قاب نسبت به نمونه مرجع شد. همچنین مقاومت خارج از صفحه‍ی میان‍قاب در حالات مختلف شرایط تکیه گاهی تا حدود 7/2 برابر بهبود یافت. علاوه بر این تقویت دیوارهای میانقاب به این شیوه ظرفیت تغییرشکل‍های غیرخطی میان‍قاب‍ها را ارتقا می بخشد. بنابراین از این روش اجرایی می‍توان به طور موثر جهت بهبود رفتار خارج از صفحه‍ی میان‍قاب‍ها، هم به عنوان یک روش تقویت میان‍قاب موجود و هم به عنوان پایدارسازی میان‍قاب‍های مصالح بنایی جدید بهره گرفت.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Out-of-plane retrofitting of unreinforced masonry infills with an opening using steel fiber reinforced concrete

نویسندگان English

Asgar Panahnadeh 1
Farshid Fathi 2
Mohammad Amir Najafgholipour 3
1 PhD. Candidate, Department of Civil Engineering, Najafabad Unit, Islamic Azad University
2 Assistant Professor, Department of Civil Engineering, Najafabad Unit, Islamic Azad University
3 Associate Professor, Department of Civil and Environmental Engineering, Shiraz University of Technology, Shiraz, Iran
چکیده English

In this paper the results of an experimental study on the out-of-plane behavior of steel frames with unreinforced masonry infills (constructed with light hollow clay blocks) with an opening, retrofitted with steel fiber reinforced strips are presented. Large scale test specimens are constructed, prepared, and tested in this study, The test specimens include an unreinforced masonry infill with an opening, a masonry infill retrofitted with steel fiber-reinforced strips in full contact with the surrounding frame, and a masonry infill retrofitted with steel fiber-reinforced strips with no contact with the steel frame. Steel fiber reinforced strips with a width and thickness of 200 mm and 20 mm, respectively are used to strengthen the masonry infills. Hooked-end steel fibers are used to reinforce the concrete overlay. The retrofitting stirps are added on both faces of the walls and anchored with steel rods to prevent premature separation of the concrete layer from the wall. According to the test results, this retrofitting technique can enhance the out-of-plane strength and deformation capacity of the masonry infills. Therefore, it can be used as an effective technique to provide stability for existing unreinforced masonry infills. Moreover, this technique can be utilized to stabilize the masonry infill in new building frames.

کلیدواژه‌ها English

Steel Frame
Masonry Infill
Out Of Plane Behavior
Steel Fiber Concrete
Increasing Static Load
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  • تاریخ دریافت 03 شهریور 1404
  • تاریخ بازنگری 06 آذر 1404
  • تاریخ پذیرش 26 آذر 1404