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بهینه‌سازی تقویت ستون‌های بتن‌آرمه با مقطع مستطیلی توسط ورق‌های FRPبه روش دورپیچ | ||
| نشریه مهندسی عمران امیرکبیر | ||
| مقاله 14، دوره 51، شماره 6، بهمن و اسفند 1398، صفحه 1241-1260 اصل مقاله (1.02 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2018.14493.5672 | ||
| نویسندگان | ||
| کورش ندیمی شهرکی1؛ محمد رئیسی* 2 | ||
| 1دانشگاه آزاد اسلامی واحد خمینی شهر | ||
| 2دانشگاه آزاد اسلامی خمینی شهر دانشکده مهندسی عمران | ||
| چکیده | ||
| دورپیچ نمودن ستون بتن‌آرمه توسط ورق‌های FRP باعث افزایش مقاومت فشاری بتن می‌شود. منحنی تنش- کرنش بتن محصور شده توسط FRP با منحنی تنش-کرنش بتن معمولی متفاوت است؛ لذا از روابطی که آئین‌‍‌‌نامه‌ها جهت طراحی و آنالیز ستون بتن‌آرمه‌ی معمولی (تقویت نشده) ارائه نموده‌اند و مبتنی بر منحنی تنش-کرنش بتن معمولی است، نمی‌توان برای آنالیز و طراحی ستون تقویت شده توسط FRP استفاده نمود. در این تحقیق در ابتدا با استفاده از منحنی تنش-کرنش بتن محصور شده که توسط محققین و آیین‌نامه‌ی ACI ارائه شده است، الگوریتمی برای تعیین ظرفیت محوری و خمشی ستون تقویت شده طراحی شد و با برنامه‌نویسی در محیط# C Visual پیاده‌سازی گردید. صحت این کار با مقایسه‌ی نتایج بدست آمده از برنامه‌نویسی با نتایج آزمایشگاهی بررسی و تائید گردید. در ادامه‌ی این تحقیق، برنامه‌نویسی طوری توسعه داده شد که بتوان از آن جهت بهینه‌سازی طراحی استفاده نمود. بدین‌صورت که با مشخص کردن ابعاد مقطع و میزان آرماتور موجود همراه با بار محوری و لنگر خمشی وارد بر ستون و همچنین معرفی مشخصات ورق‌های FRP در دسترس به همراه قیمت آنها، برنامه‌نویسی انجام شده می‌تواند مشخص کند که کدام نوع FRP در صورت استفاده، ضمن تامین ظرفیت خمشی و محوری مورد نیاز دارای حداقل قیمت نیز می‌باشد. | ||
| کلیدواژه‌ها | ||
| بتن محصور شده؛ ورق‌های FRP؛ منحنی تنش-کرنش؛ بهینه‌سازی | ||
| موضوعات | ||
| مقاوم سازی سازه های بتنی | ||
| عنوان مقاله [English] | ||
| Strengthening Optimization of RC Columns with Rectangular Section by FRP Wrapping | ||
| نویسندگان [English] | ||
| Kourosh Nadimi Shahraki1؛ Mohammad Reisi2 | ||
| 1Islamic Azad University KhomeiniShahr Branch | ||
| 2Islamic Azad Univiersity, Khomeinishahr branch | ||
| چکیده [English] | ||
| Wrapping reinforced concrete (RC) column with FRP sheets improves compressive strength of concrete. Since stress-strain curve of concrete confined with FRP is different from stress[1]strain curve of normal concrete, equations presented by codes for design and analysis of normal (unstrengthened) RC column and based on stress-strain curve of normal concrete cannot be used for design and analysis of columns strengthen with FRP. In this research, first by using stress-strain curve of confined concrete presented by researchers and ACI code, an algorithm was designed to determine axial and flexural capacity of strengthened column and implemented in Visual C# environment. Verification of this work was investigated and confirmed by comparing it with experimental results. The programming was developed in a way that it could be used to optimize the design. Thus, by specifying required information including cross sectional dimensions, number and diameter of rebars, applied axial load and bending moment on column, FRP sheet properties and price, the performed programming can determine which type of FRP, if used, while providing the required flexural and axial capacity , has also the minimum price. | ||
| کلیدواژه‌ها [English] | ||
| Confined Concrete, FRP sheets, Stress-Strain curve, optimization | ||
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| مراجع | ||
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[1] Xiao, W. H, Compressive Behavior of Concrete Confined by Carbon Fiber Composite Jackets, Journal of Materials in Civil Engineering, ASCE (12) (2000) 139-146. [2] M. Saafi, H.A. Toutanji, Z. Li, Behavior of Concrete Columns Confined with Fiber Reinforced Polymer Tubes, Journal of Materials,”ACI 96 (4) (1999) 500– .905 [3] H.A. Toutanji, Stress-Strain Characteristics of Concrete Columns Externally Confined with Advanced Fiber Composite Sheets, Journal of Materials, ACI, 96 (3) (1999) 397–.404 [4] L. Lam, J.G. Teng, Stress Strain Model for FRPConfined Concrete under Cyclic Axial Compression, Journal of Composites for Construction, ASCE, (31) (2009) 308- 321. [5] L. Lam, J.G. Teng, Design-Oriented Stress-Strain Model for FRP-Confined Concrete, Journal of Construction and Building Materials, (17) (2003) 471-489. [6] M. Samaan, A. Mirmiran, M. Shahawy, Model of Concrete Confined by Fiber Composite, Journal of Structural Engineering, 124 (9) (1998) 1025–1031. [7] H. Saadatmanesh, M.R. Ehsani, M.W. Li, Strength and Ductility of Concrete Columns Externally Reinforced with Fiber Composite Straps, Journal of Materials, ACI 91(4) (1994) 434-447. [8] A. Mirmiran, M. Shahawy, M. Samaan, H.E. Echary, J.C. Mastrapa, O. Pico, Effect of Column Parameters on FRP-Confined Concrete, Journal of Composite Construction, ASCE 2(4) (1998) 175–185. [9]M.N. Fardis, H. Khalili, Concrete Encased in Fiberglass Reinforced Plastic, Journal of Structural, ACI 78 (1981) 440-445. [10] Ahmed Abd El Fattah, New Axial Stress-Strain Model of Square Concrete Columns Confined with Lateral Steel and FRP,, Composite Structures,, (2018,). [11] H.L. Wu, Y.F. Wang, L. Yu, X.R. Li, Experimental and Computational Studies on High-Strength Concrete Circular Columns Confined by Aramid FiberReinforced Polymer Sheets, Journal of Composite Construction, ASCE, 13(2) (2009) 125-134. [12] H.O. Koksal, B. Doran, T. Turgay, A Practical Approach for Modeling FRP Wrapped Concrete Columns, Journal of Construction and Building Materials, (23) (2009) 1429-1437. [13] L.J. Malvar, K.B. Morrill, J.E. Crawford, Numerical Modeling of Concrete Confined by Fiber-Reinforced Composites, Journal of Composite Construction, ASCE, 8(4) (2004) 315-322. [14] G.K. Li, S., S.S. Pang, J.E. Helms, M.A. Stubblefield, Investigation into FRP Repaired RC Columns, Compos Structure, 62 (2003) 83-90. [15] A. Mirmiran, K. Zagers, W. Yuan, Nonlinear Finite Element Modeling of Concrete Confined by Fiber Composites, Journal of Finite Elements in Analysis and Design, 35 (2000) 79-96. [16] Mostofinejad D, Mortazavi N, Ilia E, Fibre-reinforced polymer efficiency in square columns with different corner radii, Institution of Civil Engineers Structures and Buildings,, 171,(SB3,) (2018,) 241–252,. [17] V. Yazici1, M.N.S. Hadi, Axial Load-Bending Moment Diagrams of Carbon-FRP Wrapped Hollow Core Reinforced Concrete Columns, Journal of Composite Construction, ASCE, 13(4) (2009). [18] M. Harajli, A.m. Rteil, Effect of Confinement using Fiber-Reinforced Polymer or Fiber Reinforced Concrete on Seismic Performance of Gravity LoadDesigned Columns, Journal of Structural, ACI, 101(1) (2004) 47–56. [19] S. Bousias, Triantafillou T, Fardis M, S. L, O.R. B., Fiber-Reinforced Polymer Retrofitting of Rectangular Reinforced Concrete Columns with or without Corrosion, Journal of Structural, ACI 101 (4) (2004) 512-520. [20] S. Sheikh, G. Yau, Seismic Behavior of Concrete Columns Confined with Steel and Fiber-Reinforced Polymers, Journal of Structural, ACI 99(1) (2002) 72–80. [21] YuguiCao, Yu-FeiWu, ChengJiang, Stress-Strain Relationship of FRP Confined Concrete Columns under Combined Axial Load and Bending Moment, Composites Part B: Engineering,, 134, (2018,) 207217. [22] S. Rocca, N. Galato, A. Nanni, Interaction Diagram Methodology for Design of FRP-Confined Reinforced Concrete Columns, Construction Building Material, 23 (2009) 1508–1520. [23] M.N.S. Hadi, Behaviour of FRP Strengthened Concrete Columns under Eccentric Compression Loading, Journal of Composite Structures, 77 (2007) 92–96. [24] M.N.S. Hadi, Behaviour of FRP Wrapped Normal Strength Concrete Columns under Eccentric Loading, Journal of Composite Structures, 72 (2006) 503–511. [25] S. Pessiki, K.A. Harries, K. J.T., Richard Sause, J.M. Ricles., Axial Behavior of Reinforced Concrete Columns Confined with FRP Jackets, Journal of Composites for Construction, ASCE, (5) (2001) 237245. [26] M.K. Zaki, Optimal Performance of FRP Strengthened Concrete Columns under Combined Axial–Flexural Loading, Journal of Engineering Structures, 46(14-27.) (2013). [27] Bo Hu, Jian-guo Wang, G.-q. Li., Numerical Simulation and Strength Models of FRP-Wrapped Reinforced Concrete Columns under Eccentric Loading, Journal of Construction and Building Materials,, 25 (2011) 2751-2763. [28] D. Mostofinejad, H. Saadatmand, Investigation of the Effect of Reinforced Concrete Column with Frp Slab on Column Behavior under Axial Load and Bending Moment, in: The First Specialized Conference on the Use of FRP Composites in the Rehabilitation and Construction of Structures, Tehran, (2005), (in Persian). [29] M. Barghian, M. Farzam, P. Ramezani, Interaction Diagram of Hollow Rc Columns Wrapping with FRP,, Amirkabir Journal of Science & Research, Civil and Enviromental Engineering, (ASJR-CEE,), (1395,(in Persian),). [30] C. Dundar, D. Erturkmen, S. Tokgoz., Studies on Carbon Fiber Polymer Confined Slender Plain and Steel Fiber Reinforced Concrete Columns, Journal of Engineering Structures, 102 (2015) 31–39. [31] A. Rahai, A. H., Experimental Investigation on Rectangular RC Columns Strengthened with CFRP Composites under Axial Load and Biaxial Bending, Journal of Composite Structures, 108 (2014) 538-546. [32] W Punurai, C. T. T Hsu, S Punurai, J Chen, Biaxially Loaded RC Slender Columns Strengthened by CFRP Composite Fabrics, Journal of Engineering Structures, 46 (2013) 311-321. [33] M. El Sayed, T. El Maaddawy, Analytical Model for Prediction of Load Capacity of RC Columns Confined with CFRP under Uniaxial and Biaxial Eccentric Loading, Journal of Materials and Structures, 44 (2011) 299-311. [34] S. Alessandri, G. Monti, Design Equations for the Assessment and FRP Strengthening of Reinforced Rectangular Concrete Columns under Combined Biaxial Bending and Axial Loads, Journal of Mechanics of Composite Materials, 44(3) (2008) 309-322. [35] M.K. Zaki, Investigation of FRP Strengthened Circular Columns under Biaxial Bending, Journal of Engineering Structures, 33 (2011) 1666-1679. [36] G. Campione, N. Miraglia, Strength and Strain Capacities of Concrete Compression Members Reinforced with FRP, Journal of Cement & Concrete, 25 (2003) 31-41. [37] D. Cusson, P. Paultre, Stress–Strain Model for Confined High Strength Concrete, Journal of Structural Engineering, ASCE, 121(3) (1995) 468– 477. [38] J.B. Mander, M.J.N. Priestley, R. Park, Theoretical Stress–Strain Model for Confined Concrete, Journal of Structural Engineering, 114(8) (1988) 1804–1826. [39] A. Mirmiran, M. Shahawy, Behavior of Concrete Columns Confined by Fiber Composites, Journal of Structural Engineering, ASCE, 123(5) (1997) 583590. [40] M. Shahawy, A. Mirmiran, T. Beitelman, Tests and Modeling of Carbon-Wrapped Concrete Columns, Part B, Journal of Composites for Construction, ASCE, 31 (2000) 471–480. [41] A.C. Institution, ACI Committee 440.2R-08,“Guide for The Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures., in: ACI Committee 440.2R-08,, ACI, First Printing., ACI, 2008. [42] R.D. Lacobucci, S.A. Sheikh, O. Bayrak, Retrofit of Square Concrete Columns with Carbon FiberReinforced Polymer for Seismic Resistance, Journal of Structural Engineering, ACI, 100(S81) (2003). [43] Y.S. Youcef, S. Amziane, M. Chemrouk, The Influence of CFRP on the Behavior of Reinforced Concrete Subjected to Buckling, in: Proc. of the: 4th International Conference on FRP Composites in Civil Engineering, Zurich: Switzerland, 2008. | ||
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