ارزیابی عددی رفتار چرخه‌ای دیوار برشی بتن‌آرمه دارای بازشو مقاوم‌سازی شده با کامپوزیت CFRP

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران

چکیده

امروزه استفاده از دیوارهای برشی بتن‌آرمه به ‌عنوان سیستم سازه‌ای باربر جانبی به علت عملکرد مطلوب در شکل‌پذیری، مورد استقبال طراحان قرار گرفته است. با این ‌حال ایجاد بازشو در دیوار برشی بتن‌آرمه به دلیل مسائل معماری که امری اجتناب‌ناپذیر است، سبب کاهش مقاومت، سختی و شکل‌پذیری دیوار برشی می‌شود که جهت جبران این ضعف‌ها موضوع مقاوم‌سازی دیوار برشی بتن‌آرمه مطرح می‌گردد. در مقاله حاضر ابتدا یک نمونه آزمایشگاهی دیوار برشی بتن‌آرمه بدون بازشو در نرم‎افزار ABAQUS مورد صحت‌سنجی قرار گرفت. پس از صحت‌سنجی نمونه مورد نظر به ارزیابی رفتار چرخه‌ای دیوار برشی بتن‌آرمه دارای بازشو مقاوم‌سازی شده با هشت طرح مختلف به صورت افقی، عمودی، مورب و ترکیبی توسط ورق‌های مسلح شده با الیاف کربن (CFRP) در نرم‌افزار اجزا محدود ABAQUS پرداخته شده است. جهت تحلیل استاتیکی غیرخطی، نمونه‌ها تحت بارگذاری ‌جانبی‌ چرخه‌ای قرار گرفته و پارامترهای مختلفی از قبیل سختی، تغییر مکان و شکل‌پذیری مورد بررسی و مقایسه واقع شده‌اند. نتایج به ‌صورت منحنی‌های ظرفیت (نیرو-تغییر مکان)، شکل‌پذیری، کانتور خرابی فشاری و کششی ارائه گردید. همانطور که نتایج نشان می‌دهد مقاوم‌سازی دیوارهای برشی بتن‌آرمه دارای بازشو باعث افزایش مقاومت خمشی، برشی و شکل‌پذیری می‌گردد. نتایج نشان داد که نمونه RCSW8 به مقدار 12% نسبت به نمونه مرجع ظرفیت باربری افزایش پیدا کرده است. سختی نمونه RCSW8 به میزان 15% افزایش یافته و شکل‌پذیری بهبود یافته است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Evaluation Cyclic Behavior of Concrete Shear Wall with Opening Retrofitting with Composite

نویسندگان [English]

  • fatemeh zahiri
  • ali kheyroddin
  • majid gholhaki
Faculty of Civil Engineering - Semnan UNniversity
چکیده [English]

In recent years, reinforced concrete (RC) shear walls have been welcomed by structural designers with regard to their desirable seismic performance in terms of ductility. Most of the time, creating an opening in the RC shear wall due to architectural issues, which is inevitable, results in reducing the strength, ductility and stiffness of the wall. For this reason, the issue of retrofitting the RC shear walls is developed to solve these weaknesses. In this paper, first, a laboratory sample of the reinforced concrete shear wall without opening was validated in ABAQUS software. After verification of the sample, the cyclic shear wall behavior of reinforced concrete with retractable openings with eight different designs horizontally, vertically, diagonally and combined by carbon fiber reinforced sheets (CFRP) in ABAQUS finite element software has been evaluated. For nonlinear static analysis, the specimens were subjected to lateral loading, cycling, and various parameters such as stiffness, displacement, and ductility were examined and compared. The results were presented in the form of capacity (force-displacement) curves, ductility, compressive and tensile failure contours. As the results show, reinforcement of shear walls of reinforced concrete with opening increases flexural strength, shear and ductility. The results showed that the RCSW8 sample increased by 12% compared to the reference sample bearing capacity. The hardness of the RCSW8 sample is increased by 15% and the ductility is improved.

کلیدواژه‌ها [English]

  • RC shear wall
  • Cyclic behavior
  • Retrofitting
  • Composite
  • Finite element

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نشریه مهندسی عمران امیرکبیر
دوره 54، شماره 10
دی 1401
صفحه 3857-3878

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