شبیه سازی اثرات ورق های FRP روی رفتار غیر خطی اتصالات تیر– ستون بتن مسلح | ||
| پژوهش های زیرساخت های عمرانی | ||
| دوره 7، شماره 1 - شماره پیاپی 12، شهریور 1400، صفحه 131-151 اصل مقاله (3.49 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22091/cer.2021.7364.1296 | ||
| نویسندگان | ||
| مهدی نعمت زاده* 1؛ سینا بهارلو2؛ جواد شایان فر3؛ سیدمحمدرضا حسنی4 | ||
| 1گروه مهندسی عمران، دانشکده مهندسی و فناوری، دانشگاه مازندران، بابلسر، ایران | ||
| 2دانشکده مهندسی و فناوری، دانشگاه مازندران، بابلسر، ایران | ||
| 3گروه مهندسی عمران، دانشکده مهندسی و فناوری، دانشگاه مازندران. | ||
| 4دانشکده عمران، دانشگاه صنعتی نوشیروانی بابل. | ||
| چکیده | ||
| آسیبپذیری و رفتار لرزهای نامناسب اتصالات تیر- ستون در سازههای بتنی که براساس آییننامههای گذشته و بدون ملاحظات لرزهای طراحی شدهاند، با توجه به نتایج حاصل از آزمایشگاه و زلزلههای گذشته اثبات شده است. به منظور ارتقا و بهبود سطح عملکرد سازههای قدیمی به سطح عملکرد مورد انتظار آییننامههای جدید، در وهله نخست، تعیین نقاط ضعف و رفتار لرزهای سازه و در وهله دیگر، در صورت نیاز به مقاومسازی نقاط ضعف، ارائه یک راهحل مقاومسازی مقتضی ضروری میباشد. از اینرو در این تحقیق، تأثیر استفاده از الیاف تقویتشده پلیمری در مقاومسازی اتصالات در سطح عضو مورد ارزیابی و بررسی قرار میگیرد. در این مقاله، مدلی تحلیلی به منظور شبیهسازی رفتار غیرخطی اتصالات مقاومسازی شده با ورقهای FRP ارائه شده است. در مدل مذکور، رفتار غیرخطی در هسته اتصالات با استفاده از دو فنر محوری مورب شبیهسازی میشود. خصوصیات بار- تغییرشکل نظیر در فنرهای محوری تابعی از رابطه تنش اصلی کششی- تغییرشکل برشی در هسته اتصال میباشد. از اینرو، براساس مکانیسم رفتاری اتصالات و با استفاده از نتایج آزمایشگاهی، روابط تنش اصلی کششی- تغییرشکل برشی برای اتصالات بتنمسلح با مهارهای مختلف آرماتورهای طولی تیر ارائه شده است. مقایسه نتایج حاصل از مدل عددی و نتایج گزارش شده از آزمایشات، قابلیت مدل پیشنهادی در پیشبینی رفتار غیرخطی اتصالات مقاومسازی شده با ورقهای FRP را تأیید کرده است. | ||
| کلیدواژهها | ||
| اتصالات بتن مسلح؛ ورق های FRP؛ تحلیل غیرخطی؛ مقاومسازی لرزه ای؛ شبیهسازی | ||
| عنوان مقاله [English] | ||
| Simulating Effect of FRP Sheets on Nonlinear Behavior of Reinforced Concrete Beam- Column Connections | ||
| نویسندگان [English] | ||
| Mahdi Nematzadeh1؛ Sina Baharlo2؛ Javad Shayanfar3؛ Seyed Mohammad Reza Hasani4 | ||
| 1Department of Civil Engineering, Faculty of Engineering and Technology, University of Mazandaran, Babolsar, Iran | ||
| 2Department of Civil Engineering, Faculty of Engineering and Technology, University of Mazandaran, Babolsar, Iran | ||
| 3Department of Civil Engineering, Faculty of Engineering and Technology, University of Mazandaran, Babolsar, Iran | ||
| 4PhD Candidate, Faculty of Civil Engineering, Babol Noshirvani University, Babol, Iran. | ||
| چکیده [English] | ||
| The vulnerability and improper seismic behavior of beam-column connections in reinforced concrete structures designed based on past codes without seismic considerations has been established through data obtained from experiments and past earthquakes. In this research, the use of fiber-reinforced polymer (FRP) sheets attached to the surface of the member for strengthening connections was investigated. Here, an analytic model was presented for simulating the nonlinear behavior of connections strengthened with FRP sheets. In this model, the nonlinear behavior of the core zone of the connections was simulated with two diagonal linear springs. The corresponding load-displacement relationship in the linear springs is a function of the principal tensile stress-shear deformation in the core zone of the connection. Therefore, based on the behavioral mechanism of the connections and using the experimental results, the principal tensile stress-shear deformation relationships for reinforced concrete connections with different restraints for the longitudinal rebars of the beam were developed. Comparing the results of the numerical model with those obtained from the experiments verified the ability of the proposed model in predicting the nonlinear behavior of connections strengthened with FRP sheets. | ||
| کلیدواژهها [English] | ||
| Reinforced concrete connections, FRP sheets, nonlinear analysis, seismic strengthening, simulation | ||
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| مراجع | ||
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