Seismic Performance of Large-Scale RC Eccentric Corner Beam-Column-Slab Joints Strengthened with CFRP Systems
Publication: Journal of Composites for Construction
Volume 24, Issue 2
Abstract
Eccentric corner beam-column joints of existing reinforced concrete (RC) frames, in which the beam axes are eccentric to the column axis, can be highly vulnerable to brittle joint shear failure under earthquake loading. Externally bonded fiber-reinforced polymer (FRP) composites provide a strengthening option, although research on this method is limited. This paper addresses such a knowledge gap by considering the influence of key parameters of joint transverse reinforcement ratio, eccentricity, and carbon FRP (CFRP) strengthening on the seismic performance of large-scale eccentric corner beam-column-slab joints containing a transverse beam and slab. Seven specimens, including four control specimens and three strengthened specimens, were designed and tested. Three CFRP strengthening schemes, aimed at improving joint shear capacity and overall seismic behavior, were proposed. Upon the comparison and discussion of test results, the influence of joint transverse reinforcement ratio, eccentricity, and the proposed CFRP strengthening schemes on the seismic behavior of such eccentric joints was established. Irrespective of the joint region and with or without adequate transverse reinforcement, all control specimens experienced joint shear failure due to the adverse effects of eccentricity. The CFRP intervention changed the failure mode from brittle joint shear failure to ductile beam-hinge failure. The mechanism and effectiveness of the proposed CFRP strengthening schemes were finally validated and several suggestions on CFRP strengthening are provided for eccentric joints.
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Acknowledgments
This study is financially supported by the National Key Research and Development Program of China (Grant No. 2017YFC0703001) and the National Natural Science Foundation of China (Grant Nos. 51478143 and 51278150).
References
ACI (American Concrete Institute). 2002. Recommendations for design of beam-column connections in monolithic reinforce concrete structures. ACI 352R. Farmington Hills, MI: ACI.
ACI (American Concrete Institute). 2014. Building code requirements for structural concrete. ACI 318. Farmington Hills, MI: ACI.
ACI (American Concrete Institute). 2017. Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures. ACI 440.2R. Farmington Hills, MI: ACI.
Akguzel, U., and S. Pampanin. 2010. “Effects of variation of axial load and bidirectional loading on seismic performance of GFRP retrofitted reinforced concrete exterior beam-column joints.” J. Compos. Constr. 14 (1): 94–104. https://doi.org/10.1061/(ASCE)1090-0268(2010)14:1(94).
Akguzel, U., and S. Pampanin. 2012. “Assessment and design procedure for the seismic retrofit of reinforced concrete beam-column joints using FRP composite materials.” J. Compos. Constr. 16 (1): 21–34. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000242.
Al-Salloum, Y. A., N. A. Siddiqui, H. M. Elsanadedy, A. A. Abadel, and M. A. Aqel. 2011. “Textile-reinforced mortar versus FRP as strengthening material for seismically deficient RC beam-column joints.” J. Compos. Constr. 15 (6): 920–933. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000222.
Alsayed, S. H., Y. A. Al-Salloum, T. H. Almusallam, and N. A. Siddiqui. 2010. “Seismic response of FRP-upgraded exterior RC beam-column joints.” J. Compos. Constr. 14 (2): 195–208. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000067.
Antonopoulos, C. P., and T. C. Triantafillou. 2003. “Experimental investigation of FRP-strengthened RC beam-column joints.” J. Compos. Constr. 7 (1): 39–49. https://doi.org/10.1061/(ASCE)1090-0268(2003)7:1(39).
ASCE. 2013. Seismic evaluation and retrofit of existing buildings. ASCE/SEI 41. Reston, VA: ASCE.
ASTM. 2016. Standard test methods for tension testing of metallic materials. ASTM E8/E8M. West Conshohocken, PA: ASTM.
ASTM. 2017a. Standard test method for tensile properties of polymer matrix composite materials. ASTM D3039/D3039M. West Conshohocken, PA: ASTM.
ASTM. 2017b. Standard test method for compressive strength of cylindrical concrete specimens. ASTM C39/C39M. West Conshohocken, PA: ASTM.
Bousselham, A. 2010. “State of research on seismic retrofit of RC beam-column joints with externally bonded FRP.” J. Compos. Constr. 14 (1): 49–61. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000049.
Canbolat, B. B., and J. K. Wight. 2008. “Experimental investigation on seismic behavior of eccentric reinforced concrete beam-column-slab connections.” ACI Struct. J. 105 (2): 154–162.
Chen, C. C., and G. K. Chen. 1999. “Cyclic behavior of reinforced concrete eccentric beam-column corner joints connecting spread-ended beams.” ACI Struct. J. 96 (3): 443–449.
De Risi, M. T., and G. M. Verderame. 2017. “Experimental assessment and numerical modeling of exterior non-conforming beam-column joints with plain bars.” Eng. Struct. 150 (Nov): 115–134. https://doi.org/10.1016/j.engstruct.2017.07.039.
Del Vecchio, C., M. Di Ludovico, A. Balsamo, A. Prota, G. Manfredi, and M. Dolce. 2014. “Experimental investigation of exterior RC beam-column joints retrofitted with FRP Systems.” J. Compos. Constr. 18 (4): 04014002. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000459.
Engindeniz, M., L. F. Kahn, and A. H. Zureick. 2008. “Performance of an RC corner beam-column joint severely damaged under bidirectional loading and rehabilitated with FRP composites.” Earthquake Resistant Des. SP-258-2: 19–36.
Eslami, A., and H. R. Ronagh. 2014. “Experimental investigation of an appropriate anchorage system for flange-bonded carbon fiber-reinforced polymers in retrofitted RC beam-column joints.” J. Compos. Constr. 18 (4): 04013056. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000456.
Esmaeeli, E., F. Danesh, K. F. Tee, and S. Eshghi. 2017. “A combination of GFRP sheets and steel cage for seismic strengthening of shear-deficient corner RC beam-column joints.” Compos. Struct. 159 (Jan): 206–219. https://doi.org/10.1016/j.compstruct.2016.09.064.
Garcia, R., Y. Jemaa, Y. Helal, M. Guadagnini, and K. Pilakoutas. 2014. “Seismic strengthening of severely damaged beam-column RC joints using CFRP.” J. Compos. Constr. 18 (2): 04013048. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000448.
Gergely, J., C. P. Pantelides, and L. D. Reaveley. 2000. “Shear strengthening of RCT-joints using CFRP composites.” J. Compos. Constr. 4 (2): 56–64. https://doi.org/10.1061/(ASCE)1090-0268(2000)4:2(56).
Ghobarah, A., and T. El-Amoury. 2005. “Seismic rehabilitation of deficient exterior concrete frame joints.” J. Compos. Constr. 9 (5): 408–416. https://doi.org/10.1061/(ASCE)1090-0268(2005)9:5(408).
Hadi, M. N. S., and T. M. Tran. 2014. “Retrofitting nonseismically detailed exterior beam–column joints using concrete covers together with CFRP jacket.” Constr. Build. Mater. 63 (Jul): 161–173. https://doi.org/10.1016/j.conbuildmat.2014.04.019.
Hwang, S. J., and H. J. Lee. 1999. “Analytical model for predicting shear strengths of exterior reinforced concrete beam-column joints for seismic resistance.” ACI Struct. J. 96 (5): 846–857.
Ilki, A., I. Bedirhanoglu, and N. Kumbasar. 2011. “Behavior of FRP-retrofitted joints built with plain bars and low-strength concrete.” J. Compos. Constr. 15 (3): 312–326. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000156.
Le-Trung, K., K. Lee, J. Lee, D. H. Lee, and S. Woo. 2010. “Experimental study of RC beam-column joints strengthened using CFRP composites.” Composites Part B 41 (1): 76–85. https://doi.org/10.1016/j.compositesb.2009.06.005.
Lee, H., and J. Ko. 2007. “Eccentric reinforced concrete beam-column connections subjected to cyclic loading in principal directions.” ACI Struct. J. 104 (4): 459–467.
Li, B., Q. Kai, and W. C. Xue. 2012. “Effects of eccentricity on the seismic rehabilitation performance of nonseismically detailed interior beamwide column joints.” J. Compos. Constr. 16 (5): 507–519. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000287.
Ma, C. L., D. Y. Wang, and Z. Y. Wang. 2017. “Seismic retrofitting of full-scale RC interior beam-column-slab subassemblies with CFRP wraps.” Compos. Struct. 159 (Jan): 397–409. https://doi.org/10.1016/j.compstruct.2016.09.094.
Mahin, S. A., and V. V. Bertero. 1981. “An evaluation of inelastic seismic design spectra.” J. Struct. Div. 107 (ST9): 1777.
Ministry of Construction of the People’s Republic of China. 2010. Code for design of concrete structures. [In Chinese.] GB 50010. Beijing: China Architecture and Building Press.
Ministry of Construction of the People’s Republic of China. 2014. Design code for strengthening concrete structure. [In Chinese.] GB 50367. Beijing: China Architecture and Building Press.
Pantelides, C. P., J. Hansen, J. Nadauld, and L. D. Reaveley. 2002. Assessment of reinforced concrete building exterior joints with substandard details. Berkeley, CA: Pacific Earthquake Engineering Center, Univ. of California.
Park, S., and K. M. Mosalam. 2013. “Experimental investigation of nonductile RC corner beam-column joints with floor slabs.” J. Struct. Eng. 139 (1): 1–14. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000591.
Pohoryles, D. A., J. Melo, T. Rossetto, D. D’Ayala, and H. Varum. 2018. “Experimental comparison of novel CFRP retrofit schemes for realistic full-scale RC beam-column joints.” J. Compos. Constr. 22 (5): 04018027. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000865.
Sezen, H. 2012. “Repair and strengthening of reinforced concrete beam-column joints with fiber-reinforced polymer composites.” J. Compos. Constr. 16 (5): 499–506. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000290.
Shin, M. S., and J. M. LaFave. 2004. “Seismic performance of reinforced concrete eccentric beam-column connections with floor slabs.” ACI Struct. J. 101 (3): 403–412.
Tsonos, A. G. 2008. “Effectiveness of CFRP-jackets and RC-jackets in post-earthquake and pre-earthquake retrofitting of beam-column subassemblages.” Eng. Struct. 30 (3): 777–793. https://doi.org/10.1016/j.engstruct.2007.05.008.
Vollum, R. L., and J. B. Newman. 1999. “Towards the design of reinforced concrete eccentric beam-column joints.” Mag. Concr. Res. 51 (6): 397–407. https://doi.org/10.1680/macr.1999.51.6.397.
Zamani, B. E., and H. Shariatmadar. 2016. “Strengthening and rehabilitation of exterior RC beam-column joints using carbon-FRP jacketing.” Mater. Struct. 49 (12): 5067–5083. https://doi.org/10.1617/s11527-016-0844-2.
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©2019 American Society of Civil Engineers.
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Received: Nov 14, 2018
Accepted: Jun 21, 2019
Published online: Dec 30, 2019
Published in print: Apr 1, 2020
Discussion open until: May 30, 2020
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