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Ductility Factor Evaluation of Concrete Moment Frame Retrofitted by FRP Subjected to Seismic Loads

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Most of the reinforced concrete buildings that have been constructed are not earthquake resistant or have not sufficient and acceptable resistance. Therefore, these buildings need retrofitting with reliable, simple, and cost-effective retrofitting methods, particularly against lateral loads. Since a significant number of vulnerable buildings have already been designed, raising their seismic resistance in different ways can lead more or less to functional challenges and structural design changes. Building industry researchers have always tried different approaches to fix defects in concrete structures. Today the use of advanced composite polymer materials to reinforce and strengthen structures is developing. One of the most important goals of seismic standards for structures is to provide enough ductility, because under such conditions the structure will be able to dissipate a sufficient amount of earthquake energy. This article describes the role of polymeric fibers enhanced by the fiber-reinforced polymer (FRP) in reinforcing reinforced concrete structures. Therefore, the most fundamental steps to achieving this goal is an evaluation of the response modification factor (R) and the ductility coefficient (μ). Due to this important need, this study will present a formula that calculates the amount of plasticity in concrete structures. Three concrete moment frames of 3, 6 and 12 floors with and without composite FRP have been tested for finding this coefficient. In SAP2000, nonlinear static analysis (Push-Over) of the frames has been performed, and then factors of ductility and response have been determined from the base shear and the roof displacement curve.
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Concrete Moment Frame; FRP; Push-Over Analysis; Response Modification Factor (R); Ductility Coefficient; SAP2000

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A. Mosallam, K. Allam, and M. Salama, Analytical and numerical modeling of RC beam-column joints retrofitted with FRP laminates and hybrid composite connectors, Composite Structures, vol. 214, pp. 486–503, 2019.

M. Haji, H. Naderpour, and A. Kheyroddin, Experimental study on influence of proposed FRP-strengthening techniques on RC circular short columns considering different types of damage index, Composite Structures, Vol. 209, pp. 112–128, 2019.

P. Colajanni, A. Recupero, and N. Spinella, Increasing the shear capacity of reinforced concrete beams using pretensioned stainless steel ribbons, Structural Concrete, Vol. 18, (issue 3), pp. 444–453, 2017.

M. Alam, M. Shahria, Moni, and S. Tesfamariam. Seismic over strength and ductility of concrete buildings reinforced with super elastic shape memory alloy rebar, Engineering Structures 34, pp. 8-20, 2012.

C. Chalioris, P.-M. Kosmidou, and N. Papadopoulos, Investigation of a new strengthening technique for RC deep beams using carbon FRP ropes as transverse reinforcements, Fibers, Vol. 6, (issue 3), p. 52, 2018.

H. Farrokh Ghatte, M. Comert, C. Demir, M. Akbaba, and A. Ilki, Seismic retrofit of full-scale substandard extended rectangular RC columns through CFRP jacketing: test results and design recommendations, Journal of Composites for Construction, Vol. 23, (issue 1), Article ID 04018071, 2018.

F. Jawad, C. Y. Adarsha, T. Raghavendra, B. C. Udayashankar, and K. Natarajan, Structural behavior of concrete beams and columns reinforced with Waste Plastic incorporated GFRP (WPGFRP) rebars, Journal of Building Engineering, Vol. 23, pp. 172–184, 2019.

M. Aliasghar-Mamaghani and A. Khaloo, Seismic behavior of concrete moment frame reinforced with GFRP bars, Composites Part B: Engineering, Vol. 163, pp. 324–338, 2019.

O. S. AlAjarmeh, A. C. Manalo, B. Benmokrane, W. Karunasena, and P. Mendis, Axial performance of hollow concrete columns reinforced with GFRP composite bars with different reinforcement ratios, Composite Structures, Vol. 213, pp. 153–164, 2019.

O. S. AlAjarmeh, A. C. Manalo, B. Benmokrane, W. Karunasena, P. Mendis, and K. T. Q. Nguyen, Compressive behavior of axially loaded circular hollow concrete columns reinforced with GFRP bars and spirals, Construction and Building Materials, Vol. 194, pp. 12–23, 2019.

S. Tarfan, M. Banazadeh, and M. Zaker Esteghamati, Probabilistic seismic assessment of non-ductile RC buildings retrofitted using pre-tensioned aramid fiber reinforced polymer belts, Composite Structures, Vol. 208, pp. 865–878, 2019.

J. Z. Wang, J. L. Yang, and L. Cheng, Experimental study of seismic behavior of high-strength RC columns strengthened with CFRP subjected to cyclic loading, Journal of Structural Engineering, Vol. 145, (issue 2), Article ID 04018240, 2018.

R. Sharma and P. P. Bansal, Behavior of RC exterior beam column joint retrofitted using UHP-HFRC, Construction and Building Materials, Vol. 195, pp. 376–389, 2019.

M. Chellapandian, S. S. Prakash, and A. Sharma, Axial compression-bending interaction behavior of severely damaged RC columns rapid repaired and strengthened using hybrid FRP composites, Construction and Building Materials, Vol. 195, pp. 390–404, 2019.

A. Gholampour, R. Hassanli, J. E. Mills, T. Vincent, and M. Kunieda, Experimental investigation of the performance of concrete columns strengthened with fiber reinforced concrete jacket, Construction and Building Materials, Vol. 194, pp. 51–61, 2019.

M. E. Arslan, A. Durmuş, and M. Hüsem, Cyclic behavior of GFRP strengthened infilled RC frames with low and normal strength concrete, Science and Engineering of Composite Materials, Vol. 26, (issue 1), pp. 30–42, 2018.

R. K. S. Al-Hamd, M. Gillie, L. S. Cunningham, H. Warren, and A. S. Albostami, Novel shearhead reinforcement for slab-column connections subject to eccentric load and fire, Archives of Civil and Mechanical Engineering, Vol. 19, (issue 2), pp. 503–524, 2019.

H. Akhundzada, T. Donchev, and D. Petkova, Strengthening of slab-column connection against punching shear failure with CFRP laminates, Composite Structures, Vol. 208, pp. 656–664, 2019.

Balsamo, A., Colombo, A., Manfredi, G., Negro, P., and Prota, A. Seismic behavior of a full-scale RC frame repaired using CFRP laminates, Engineering Structures 27(5), 769–780 2012.

A. K. Harries, J. A. Peck, and J. E. Abraham, Enhancing stability of structural steel sections using FRP. Thin-Walled Structures, Vol. 47, (issue 2009), 1092–1101, 2009.

X. K. Zou, Teng, De Lorenzis J. G., and Xia S. H. L. Optimal performance-based design of FRP jackets for seismic retrofit of reinforced concrete frames, Composites Part B: Engineering Vol. 38, (issue 5-6), 584–597, 2007.

S. Pampanin, D. Bolognini, and A. Pavese, Performance-based seismic retrofit strategy for existing reinforced concrete frame systems using fiber-reinforced polymer composites, Journal of Composites for Construction Vol. 11, (issue 2), 211–226, 2007.

Maheri, M. R. and Akbari, R. Seismic behaviour factor, R, for steel X-braced and kneebraced RC buildings, Engineering Structures 25, 1505–1513, 2003.

Thermou, G. E., Pantazopoulou, S. J., and Elnashai, A. S. Global Interventions for Seismic Upgrading of Substandard RC Buildings, Journal of Structural Engineering Vol. 138, (issue 3), pp. 387–401, 2012.

A. M. Mwafy, and A. S. Elnashai, A. S. Calibration of force reduction factors of RC buildings, Journal of Earthquake Engineering Vol. 6, (issue 2), pp. 239–273, 2002.

T. K. Makarios, Seismic nonlinear static new method of spatial asymmetric multi-storey reinforced concrete buildings, The Structural Design of Tall and Special Buildings Vol. 21, (issue 11), pp. 800–823, 2012.

A. Niroomandi, A. Maheri, M. R. Maheri, and Mahini, S. S. Seismic performance of ordinary RC frames retrofitted at joints by FRP sheets,”Engineering Structures Vol. 32, (issue 8), pp. 2326–2336, 2010.

ANSYS [2005] ANSYS Manual, ANSYS, INC., Canonsburg, Pennsylvania. Applied Technology Council (ATC) [1996] Seismic Evaluation and Retrofit of Concrete Buildings, Report No. ATC-40, Redwood City, California, 2005.

S. S. Mahini, and H. R. Ronagh, Strength and ductility of FRP web-bonded RC beams for the assessment of retrofitted beam–column joints, Composite Structures Vol. 92, (issue 6), pp. 1325–1332, 2010.

S. A. Hadigheh, S. S. Mahini, M. R. Maheri, Seismic Behavior of FRP-Retrofitted Reinforced Concrete Frames, Journal of Earthquake Engineering, Vol. 18, pp 1171–1197, 2014.

ABAQUS [2007] Theory Manual, User Manual and Example Manual, Hibbitt, Karlsson, and Sorensen, Inc, Pawtucket, 2007.

H. R. Ronagh, and A. Eslami, Flexural retrofitting of RC buildings using GFRP/CFRP – A comparative study, Composites Part B: Engineering 46, pp. 188–196, 2013.

Khalifa, A., New Strengthening Technique Using FRP to Improve the Confinement Effectiveness of the Rectangular Columns, (2014) International Review of Civil Engineering (IRECE), 5 (1), pp. 19-31.

Benjabrou, M., Zeggwagh, G., Gueraoui, K., Sammouda, M., Driouich, M., Evaluation of Seismic Vulnerability of Existing Reinforced Concrete Structure by Non-Iterative Spectral Method Using Pushover Analysis with Interpretation of Fragility Curves by RISK UE, (2017) International Review of Civil Engineering (IRECE), 8 (4), pp. 177-186.

Bendada, A., El Hammoumi, A., Gueraoui, K., Sammouda, M., Ibenbrahim, A., Vulnerability Analysis of a School Building Under Tsunami Loading in the Gulf of Cadiz, (2017) International Review of Civil Engineering (IRECE), 8 (1), pp. 11-18.

Murad, Y., Abu Zaid, J., Finite Element Modelling of Reinforced Concrete Beams Strengthened with Different Configuration of Carbon Fiber Sheets, (2019) International Review of Civil Engineering (IRECE), 10 (4), pp. 188-196.

Chunli Zhou, Xiaowei Li, Dongbo Wang, and Shunxiang Xia, Analysis of Bearing Capacity and Seismic Performance of Circular RC Columns Strengthened with Externally Wrapped Steel Plates, Advances in Civil Engineering, 17 pages, Vol. 2019.

S. K. Gopika, P, A. Suji, Comparative Study on Retrofitting of Reinforced Concrete Column by Concrete, Steel and FRP Jacketing using ETABS and ANSYS, International Journal for Research in Applied Science & Engineering Technology (IJRASET), Vol. 7 (issue V), pp. 3930-3936, 2019.

V. M. Karbhari, and S. B. Shulley, Use of Composites for Rehabilitation of Steel Structures – Determination of Bond Durability. Journal of Materials in Civil Engineering. ASCE, Vol. 7, (issue 4), pp. 239-245, November 1995.

G. C. Mays, and A. R. Hutchinson. Adhesives in Civil Engineering. Cambridge University Press, New York, NY, 1992.

Francis, R. Bimetallic Corrosion. Guides to Good Practice in Corrosion Control, National Physical Laboratory, 2000.

Tavakkolizadeh, M., and Saadatmanesh, H. Galvanic Corrosion of Carbon and Steel in Aggressive Environment. Journal of Composites for construction. ASCE, Vol. 5, (issue 3), pp. 200- 210 August 2001.

Rahul, H.P., An Approach with Case Studies on Ultra-High Performance Concrete, International Conference on Advances in Civil and Mechanical Engineering (ACME)-ISBN-978-93-81693-54-2, pp. 505-509, 2014.

Abdelrazig, B., Properties and Applications of CeraCem Ultra-High Performance Self-Compacting Concrete, Proceeding of the International Conference on Construction and Building Technology (ICCBT), 20 (2008), 217-226, 2008.

Danraka, N. M., H. Mahir Mahmod, M. H., and Oluwatosin, J. O-K., Strengthening of Reinforced Concrete Beams using FRP Technique: A Review, International Journal of Engineering Science and Computing, Vol. 7 (issue 6), 13199-13213, June 2017.

Federal Emergency Management Agency FEMA 273& FEMA 274", USA, 1996.

Elnashai, A. S. and A. M. Mwafy. Over strength and force reduction factors of multistory reinforced‐concrete buildings, The Structural Design of Tall and Special Buildings 11.5, 329-351, 2002.

Tbatou, T., El Youbi, M., Dynamic and Structural Study of a RC Building Braced by FRP Composite Materials, (2020) International Review of Civil Engineering (IRECE), 11 (1), pp. 1-9.


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