بررسی آزمایشگاهی بهسازی میان‌قاب‌های‌ بلوک ‌سفال با استفاده از الیاف شیشه مقاوم در برابر قلیا در بارگذاری داخل صفحه

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

دانشکده مهندسی عمران، دانشگاه صنعتی شاهرود

10.22034/ceej.2025.67265.2437

چکیده

رفتار سازه‌های قاب بتن‌آرمه تحت تأثیر نیروهای سه‌گانه زلزله (دو مؤلفه افقی و یک مؤلفه قائم) دست‌خوش تغییرات اساسی می‌شود. بررسی حوادث زلزله سرپل ذهاب در سال ۱۳۹۶، نشان‌دهنده آسیب‌های قابل‌توجه ناشی از اندرکنش نامطلوب بین قاب و میان‌قاب‌های غیرسازه‌ای است. اثر اندرکنشی قاب و میان‌قاب و پارامترهای کلیدی رفتاری شامل سختی، شکل‌پذیری و ظرفیت جذب انرژی از طریق بارگذاری چرخه‌ای داخل‌صفحه قابل ارزیابی است. در این پژوهش، مطالعه آزمایشگاهی روی سه نمونه قاب بتن‌آرمه ویژه با مقیاس نیم انجام گرفته است که شامل: یک قاب مرجع بدون میان‌قاب، یک قاب با میان‌قاب بلوک ‌سفال و یک قاب با میان‌قاب بلوک ‌‌سفال بهسازی شده با استفاده از الیاف شیشه مقاوم در برابر قلیا دارای وال‌پست می‌باشد. مشخصات هندسی، جزئیات آرماتوربندی و خصوصیات مکانیکی بتن در تمامی نمونه‌ها یکسان در نظر گرفته شده و بلوک‌های ‌سفال با ابعاد استاندارد (10×۲۰×25 سانتی‌متر) کار رفته‌اند. هدف اصلی این تحقیق، ارزیابی رفتار دینامیکی میان‌قاب‌های بلوک‌ سفال و اثرات متقابل آن‌ها با قاب‌های بتنی تحت بارگذاری داخل‌ صفحه است. نتایج نشان داد که نمونه بهسازی شده بیشترین مقاومت را (در فشار 79% و در کشش 138%) نسبت به نمونه‌های دیگر را داشته. همچنین در قاب با میان‌قاب کامل با ارائه سختی بالاتر (در فشار 206% و در کشش260%) نسبت به نمونه قاب بتن آرمه تنها داشته، اما در مقایسه با نمونه بهسازی شده با الیاف شیشه، شاهد کاهش چشمگیر این سختی در فشار 171% و در کشش 299% بودیم. همچنین شکل‌پذیری نمونه تقویت شده از سایر نمونه‌ها عملکرد مناسب‌تری را ارائه داد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Experimental Study of Clay Block Infill Frame Strengthening Using AR Glass Fibers Under In-Plane Loading

نویسندگان [English]

  • Mohammad Javad Zarei
  • Jalil Shafaei
  • Farnoosh Basaligheh
Department of Civil Engineering, Shahrood University of Technology, Shahrood, Iran
چکیده [English]

In structural engineering, reinforced concrete frame systems filled with masonry walls are designated as "infilled frames". Studies have demonstrated that infills increase structural stiffness while reducing ductility. The interaction between masonry walls and the surrounding concrete frame fundamentally alters the behavioral characteristics of the system. This interaction can either enhance seismic performance or exacerbate damage; additionally, it also significantly modifies the effective stiffness and natural period of the structure. Field investigations following the Kermanshah earthquake (2017) revealed predominant in-plane failure mechanisms, including diagonal cracking, local crushing in force transfer regions, and sliding along mortar joint interfaces. The Iranian Seismic Code (Standard 2800) emphasizes the separation of infills from frames to prevent this interaction.

کلیدواژه‌ها [English]

  • Reinforced concrete frame
  • Clay brick block
  • In-plane loading
  • Wall post
  • AR glass fiber
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