Strut-Relieved Single Steel Haunch Bracing System for Mitigating Seismic Damage of Gravity Load Designed Structures
Publication: Journal of Structural Engineering
Volume 144, Issue 10
Abstract
A large number of existing reinforced concrete structures, constructed before the 1970s, are poorly designed and inadequately detailed. The design and detailing of these structures are based on the prevailing guidelines and practices to cater for the gravity load demand. Such structures are extremely vulnerable during seismic events. An efficient, easy to implement, and cost-effective intervention to those structures is the immediate requirement to mitigate the damage due to possible seismic events. The present study deals with the development of an innovative single metallic bracing system fixing to the bottom of the beam-column subassemblage. This is made to protect the week joint region of gravity load designed (GLD) structures by allowing the force path to bypass from beam to column. A steel haunch system was developed and implemented in beam-column subassemblages representing the GLD scenario. Analytical formulations were developed for evaluating the force flow mechanisms in rigid and flexible systems. Experimental studies on upgraded beam-column subassemblages were carried out to check their performance under reverse cyclic loading. The key behavioral parameters such as hysteresis behavior, energy dissipation, and stiffness degradation were evaluated. It was found that the single steel haunch system was very effective in improving the performance of the subassemblages. The steel haunch system was further improved by introducing a strut relieving mechanism, which showed encouraging performance. At drift corresponding to the 20% reduction in the strength, it was found that the single haunch and strut relieving bracing systems were capable of dissipating almost 46% and 60%, respectively, more energy than that of the GLD specimen. The study points out the feasibility of seismic damage mitigation of poorly designed building stock using the innovative steel haunch system.
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Acknowledgments
The authors duly acknowledge the support received from technical staffs of Special and Multi-functional Structures Laboratory (SMSL) of CSIR-Structural Engineering Research Centre (SERC) for fabrication of the upgrading scheme and for conducting the full-scale experiments.
References
Abdulridha, A., D. Palermo, S. Foo, and F. J. Vecchio. 2013. “Behavior and modeling of superelastic shape memory alloy reinforced concrete beams.” Eng. Struct. 49 (Apr): 893–904. https://doi.org/10.1016/j.engstruct.2012.12.041.
Adam, J. M., E. Giménez, and P. A. Calderón. 2008. “Experimental study of beam-column joints in axially loaded RC columns strengthened by steel angles and strips.” Steel Compos. Struct. 8 (4): 329–342. https://doi.org/10.12989/scs.2008.8.4.329.
Akın, E., S. Z. Korkmaz, H. H. Korkmaz, and E. Diri. 2016. “Rehabilitation of infilled reinforced concrete frames with thin steel plate shear walls.” J. Perform. Constr. Facil. 30 (4): 04015098. https://doi.org/10.1061/(ASCE)CF.1943-5509.0000840.
Alcocer, S. M., and J. O. Jirsa. 1993. “Strength of reinforced concrete frame connections rehabilitated by jacketing.” ACI Struct. J. 90 (3): 249–261.
Alhaddad, M. S., N. A. Siddiqui, A. A. Abadel, S. H. Alsayed, and Y. A. Al-Salloum. 2012. “Numerical investigations on the seismic behavior of FRP and TRM upgraded RC exterior beam-column joints.” J. Compos. Constr. 16 (3): 308–321. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000265.
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.
Andrawes, B., M. Shin, and N. Wierschem. 2010. “Active confinement of reinforced concrete bridge columns using shape memory alloys.” J. Bridge Eng. 15 (1): 81–89. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000038.
Antonopoulos, C. P., and T. C. Triantafillou. 2002. “Analysis of FRP-strengthened RC beam-column joints.” J. Compos. Constr. 6 (1): 41–51. https://doi.org/10.1061/(ASCE)1090-0268(2002)6:1(41).
Arzeytoon, A., A. Hosseini, and A. Goudarzi. 2016. “Seismic rehabilitation of exterior RC beam-column joints using steel plates, angles, and posttensioning rods.” J. Perform. Constr. Facil. 30 (1): 04014200. https://doi.org/10.1061/(ASCE)CF.1943-5509.0000721.
Beschi, C., A. Meda, and P. Riva. 2011. “Column and joint retrofitting with high performance fiber reinforced concrete jacketing.” J. Earthquake Eng. 15 (7): 989–1014. https://doi.org/10.1080/13632469.2011.552167.
CEN (European Committee for Standardization). 2004. Eurocode 2: Design of concrete structures. Part 1-1: General rules and rules for buildings. EN 1992-1-1:2004. Brussels, Belgium: CEN.
CEN (European Committee for Standardization). 2006. Eurocode 8: Design of structures for earthquake resistance. Part: 1: General rules, seismic actions and rules for buildings. ENV 1998-1:2004. Brussels, Belgium: CEN.
Charalambidi, B., T. Rousakis, and A. Karabinis. 2016. “Fatigue behavior of large-scale reinforced concrete beams strengthened in flexure with fiber-reinforced polymer laminates.” J. Compos. Constr. 20 (5): 04016035. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000689.
Dalalbashi, A., A. Eslami, and H. R. Ronagh. 2012. “Plastic hinge relocation in RC joints as an alternative method of retrofitting using FRP.” Compos. Struct. 94 (8): 2433–2439. https://doi.org/10.1016/j.compstruct.2012.02.016.
De Lorenzis, L., and J. Teng. 2007. “Near-surface mounted FRP reinforcement: An emerging technique for strengthening structures.” Compos Part B 38 (2): 119–143. https://doi.org/10.1016/j.compositesb.2006.08.003.
El-Amoury, T., and A. Ghobarah. 2002. “Seismic rehabilitation of beam-column joint using GFRP sheets.” Eng. Struct. 24 (11): 1397–1407. https://doi.org/10.1016/S0141-0296(02)00081-0.
Eligehausen, R., G. Genesio, J. Ožbolt, and S. Pampanin. 2008. “3D analysis of seismic response of RC beam-column exterior joints before and after retrofit.” In Concrete repair, rehabilitation and retrofitting II, edited by M. G. Alexander, H.-D. Beushausen, F. Dehn, and P. Moyo. London: Taylor & Francis.
Ferrier, E., D. Bigaud, J. C. Clément, and P. Hamelin. 2011. “Fatigue loading effect on RC beams strengthened with externally bonded FRP.” Constr. Build. Mater. 25 (2): 539–546. https://doi.org/10.1016/j.conbuildmat.2010.07.035.
Frascadore, R., M. Di Ludovico, A. Prota, G. M. Verderame, G. Manfredi, M. Dolce, and E. Cosenza. 2015. “Local strengthening of reinforced concrete structures as a strategy for seismic risk mitigation at regional scale.” Earthquake Spectra 31 (2): 1083–1102. https://doi.org/10.1193/122912EQS361M.
Ghobarah, A., and H. Abou Elfath. 2001. “Rehabilitation of a reinforced concrete frame using eccentric steel bracing.” Eng. Struct. 23 (7): 745–755. https://doi.org/10.1016/S0141-0296(00)00100-0.
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).
Ghobarah, A., and A. Said. 2001. “Seismic rehabilitation of beam-column joints using FRP laminates.” J. Earthquake Eng. 5 (1): 113–129. https://doi.org/10.1080/13632460109350388.
Ha, G.-J., C.-G. Cho, H.-W. Kang, and L. Feo. 2013. “Seismic improvement of RC beam-column joints using hexagonal CFRP bars combined with CFRP sheets.” Compos. Struct. 95 (Apr): 464–470. https://doi.org/10.1016/j.compstruct.2012.08.022.
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 (30): 161–173. https://doi.org/10.1016/j.conbuildmat.2014.04.019.
Hamad, B. S., and E. Y. Abou Haidar. 2016. “Bond studies of high-strength concrete joints confined with stirrups, steel fibers, or fiber-reinforced polymer sheets.” J. Struct. Eng. 142 (1): 04015098. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001347.
Janke, L., C. Czaderski, J. Ruth, and M. Motavalli. 2009. “Experiments on the residual loadbearing capacity of prestressed confined concrete columns.” Eng. Struct. 31 (10): 2247–2256. https://doi.org/10.1016/j.engstruct.2009.04.006.
Kalogeropoulos, G. I., A.-D. G. Tsonos, D. Konstandinidis, and S. Tsetines. 2016. “Pre-earthquake and post-earthquake retrofitting of poorly detailed exterior RC beam-to-column joints.” Eng. Struct. 109 (Feb): 1–15. https://doi.org/10.1016/j.engstruct.2015.11.009.
Karayannis, C., C. Chalioris, and G. M. Sirkelis. 2008. “Local retrofit of exterior RC beam-column joints using thin RC jackets—An experimental study.” J. Earthquake Eng. Struct. Dyn. 37 (5): 727–746. https://doi.org/10.1002/eqe.783.
Karayannis, C. G., G. M. Sirkelis, and C. E. Chalioris. 2006. “Seismic performance of RC beam–column joints retrofitted using light RC jacket—Experimental study.” In Proc., First European Conf. on Earthquake Engineering and Seismology. Geneva.
Kaya, E., C. Kütan, S. Sheikh, and A. İlki. 2017. “Flexural retrofit of support regions of reinforced concrete beams with anchored FRP ropes using NSM and ETS methods under reversed cyclic loading.” J. Compos. Constr. 21 (1): 04016072. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000732.
Kurata, M., R. T. Leon, and R. DesRoches. 2012. “Rapid seismic rehabilitation strategy: Concept and testing of cable bracing with couples resisting damper.” J. Struct. Eng. 138 (3): 354–362. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000401.
Li, B., and H. Y. Grace Chua. 2009. “Seismic performance of strengthened reinforced concrete beam-column joints using FRP composites.” J. Struct. Eng. 135 (10): 1177–1190. https://doi.org/10.1061/(ASCE)0733-9445(2009)135:10(1177).
Li, B., E. S.-S. Lam, B. Wu, and Y.-Y. Wang. 2013. “Experimental investigation on reinforced concrete interior beam-column joints rehabilitated by ferrocement jackets.” Eng. Struct. 56 (Nov): 897–909. https://doi.org/10.1016/j.engstruct.2013.05.038.
Li, B., E. S.-S. Lam, B. Wu, and Y.-Y. Wang. 2015. “Seismic behavior of reinforced concrete exterior beam-column joints strengthened by ferrocement composites.” Earthquakes Struct. 9 (1): 233–256. https://doi.org/10.12989/eas.2015.9.1.233.
Lim, J. C., and T. Ozbakkaloglu. 2015a. “Hoop strains in FRP-confined concrete columns: Experimental observations.” Mater. Struct. 48 (9): 2839–2854. https://doi.org/10.1617/s11527-014-0358-8.
Lim, J. C., and T. Ozbakkaloglu. 2015b. “Influence of concrete age on stress-strain behavior of FRP-confined normal-and high-strength concrete.” Constr. Build. Mater. 82 (May): 61–70. https://doi.org/10.1016/j.conbuildmat.2015.02.020.
Ma, H., T. Wilkinson, and C. Cho. 2007. “Feasibility study on a self-centering beam-to-column connection by using the superelastic behavior of SMAs.” Smart Mater. Struct. 16 (5): 1555–1563. https://doi.org/10.1088/0964-1726/16/5/008.
Misir, I. S., and S. Kahraman. 2013. “Strengthening of non-seismically detailed reinforced concrete beam-column joints using SIFCON blocks.” Sadhana 38 (1): 69–88. https://doi.org/10.1007/s12046-013-0127-3.
Moghaddam, H., M. Samadi, K. Pilakoutas, and S. Mohebbi. 2010. “Axial compressive behavior of concrete actively confined by metal strips. Part A: Experimental study.” Mater. Struct. 43 (10): 1369–1381. https://doi.org/10.1617/s11527-010-9588-6.
Mukherjee, A., and M. Joshi. 2005. “FRPC reinforced concrete beam-column joints under cyclic excitation.” Compos. Struct. 70 (2): 185–199. https://doi.org/10.1016/j.compstruct.2004.08.022.
Nehdi, M., M. S. Alam, and M. A. Youssef. 2010. “Development of corrosion-free concrete beam-column joint with adequate seismic energy dissipation.” Eng. Struct. 32 (9): 2518–2528. https://doi.org/10.1016/j.engstruct.2010.04.020.
Novák, B., K. Ramajaneyulu, C. Roehm, and S. Sasmal. 2008. “Seismic performance of D-region of RC framed-structure designed according to different codal recommendations.” J. Struct. Eng. 35 (1): 46–51.
Pampanin, S., C. Christopoulos, and T. H. Chen. 2006. “Development and validation of a metallic haunch seismic retrofit solution for existing under-designed RC frame buildings.” Earthquake Eng. Struct. Dyn. 35 (14): 1739–1766. https://doi.org/10.1002/eqe.600.
Pantelides, C. P., Y. Okahashi, and L. D. Reaveley. 2008. “Seismic rehabilitation of reinforced concrete frame interior beam-column joints with FRP composites.” J. Compos. Constr. 12 (4): 435–445. https://doi.org/10.1061/(ASCE)1090-0268(2008)12:4(435).
Proença, J. M., A. S. Gago, and T. Heitor. 2012. “Overview of seismic strengthening interventions in school buildings in Portugal.” In Proc., 15th World Conf. on Earthquake Engineering. Lisbon, Portugal.
Qudah, S., and M. Maalej. 2014. “Application of engineered cementitious composites (ECC) in interior beam-column connections for enhanced seismic resistance.” Eng. Struct. 69 (Jun): 235–245. https://doi.org/10.1016/j.engstruct.2014.03.026.
Roehm, C., S. Sasmal, B. Novák, and K. Ramanjaneyulu. 2015. “Numerical simulation for seismic performance evaluation of fibre reinforced concrete beam column sub-assemblages.” Eng. Struct. 91 (May): 82–196.
Röhm, C., B. Novák, S. Sasmal, R. Karusala, and S. Voggu. 2012. “Behaviour of fibre reinforced beam-column sub-assemblages under reversed cyclic loading.” Constr. Build. Mater. 36 (Nov): 319–329. https://doi.org/10.1016/j.conbuildmat.2012.04.114.
Rousakis, T. C. 2016. “Reusable and recyclable nonbonded composite tapes and ropes for concrete columns confinement.” Compos. Part B 103 (Oct): 15–22. https://doi.org/10.1016/j.compositesb.2016.08.003.
Rousakis, T. C., M. E. Saridaki, S. A. Mavrothalassitou, and D. Hui. 2016. “Utilization of hybrid approach towards advanced database of concrete beams strengthened in shear with FRPs.” Compos. Part B 85 (Feb): 315–335. https://doi.org/10.1016/j.compositesb.2015.09.031.
Rousakis, T. C., and I. S. Tourtouras. 2014. “RC columns of square section: Passive and active confinement with composite ropes.” Compos. Part B 58 (Mar): 573–581. https://doi.org/10.1016/j.compositesb.2013.11.011.
Rousakis, T. C., and I. S. Tourtouras. 2015. “Modeling of passive and active external confinement of RC columns with elastic material.” ZAMM J. 95 (10): 1046–1057. https://doi.org/10.1002/zamm.201500014.
Ruiz-Pinilla, J. G., F. J. Pallarés, E. Gimenez, and P. A. Calderón. 2014. “Experimental tests on retrofitted RC beam-column joints underdesigned to seismic loads. General approach.” Eng. Struct. 59 (Feb): 702–714. https://doi.org/10.1016/j.engstruct.2013.11.008.
Said, A., and M. Nehdi. 2008. “Rehabilitation of RC frame joints using local steel bracing.” Struct. Infrastruct. Eng. 4 (6): 431–447. https://doi.org/10.1080/15732470600822033.
Said, A. M., and M. L. Nehdi. 2004. “Use of FRP for RC frames in seismic zones. Part I: Evaluation of FRP beam-column joint rehabilitation techniques.” Appl. Compos. Mater. 11 (4): 205–226. https://doi.org/10.1023/B:ACMA.0000035462.41572.7a.
Santarsiero, G., and A. Masi. 2015. “Seismic performance of RC beam-column joints retrofitted with steel dissipation jackets.” Eng. Struct. 85 (Feb): 95–106. https://doi.org/10.1016/j.engstruct.2014.12.013.
Sasmal, S., C. P. Khatri, and K. Ramanjaneyulu. 2015. “Numerical simulation of performance of near surface mounted FRP upgraded beam-column sub-assemblages under cyclic loading.” Struct. Infrastruct. Eng. 11 (8): 1012–1027. https://doi.org/10.1080/15732479.2014.926376.
Sasmal, S., and D. Nath. 2016. “Evaluation of performance of non-invasive upgradation strategy for beam-column sub-assemblages of poorly designed structures under seismic type loading.” Earthquake Eng. Struct. Dyn. 45 (11): 1817–1835. https://doi.org/10.1002/eqe.2730.
Sasmal, S., and D. Nath. 2017. “Seismic performance of non-invasive single brace made of steel and shape memory alloy for retrofit of gravity load designed sub-assemblages.” Eng. Struct. 143 (Jul): 316–329. https://doi.org/10.1016/j.engstruct.2017.04.024.
Sasmal, S., B. Novák, K. Ramanjaneyulu, V. Srinivas, C. Roehm, N. Lakshmanan, and N. R. Iyer. 2011a. “Upgradation of gravity load designed sub-assemblage subjected to seismic type loading.” J. Compos. Struct. 93 (6): 1561–1573. https://doi.org/10.1016/j.compstruct.2011.01.001.
Sasmal, S., and K. Ramanjaneyulu. 2012. “Evaluation of strength hierarchy of beam-column joints of existing RC structures under seismic type loading.” J. Earthquake Eng. 16 (6): 897–915.
Sasmal, S., K. Ramanjaneyulu, B. Novák, V. Srinivas, K. Saravana Kumar, C. Korkowski, C. Roehm, N. Lakshmanan, and N. I. Iyer. 2011c. “Seismic retrofitting of nonductile beam-column sub-assemblage using FRP wrapping and steel plate jacketing.” Constr. Build. Mater. 25 (1): 175–182. https://doi.org/10.1016/j.conbuildmat.2010.06.041.
Shafaei, J., A. Hosseini, and M. S. Marefat. 2014. “Seismic retrofit of external RC beam-column joints by joint enlargement using prestressed steel angles.” Eng. Struct. 81 (Dec): 265–288. https://doi.org/10.1016/j.engstruct.2014.10.006.
Shafaei, J., A. Hosseini, M. S. Marefat, and J. M. Ingham. 2017. “Rehabilitation of earthquake damaged external RC beam-column joints by joint enlargement using prestressed steel angles.” Earthquake Eng. Struct. Dyn. 46 (2): 291–316. https://doi.org/10.1002/eqe.2794.
Sharbatdar, M. K., A. Kheyroddin, and E. Emami. 2012. “Cyclic performance of retrofitted reinforced concrete beam-column joints using steel prop.” Constr. Build. Mater. 36 (Nov): 287–294. https://doi.org/10.1016/j.conbuildmat.2012.04.115.
Triantafyllou, G. G., T. C. Rousakis, and A. I. Karabinis. 2017. “Corroded RC beams patch repaired and strengthened in flexure with fiber-reinforced polymer laminates.” Composites Part B 112 (Mar): 125–136. https://doi.org/10.1016/j.compositesb.2016.12.032.
Tsonos, A. G. 2002. “Seismic repair of exterior R/C beam-to-column joints using two-sided and three-sided jackets.” Struct. Eng. Mech. 13 (1): 17–34. https://doi.org/10.12989/sem.2002.13.1.017.
Vincent, T., and T. Ozbakkaloglu. 2016. “Influence of overlap configuration on compressive behavior of CFRP-confined normal- and high-strength concrete.” Mater. Struct. 49 (4): 1245–1268. https://doi.org/10.1617/s11527-015-0574-x.
Wang, B., S. Zhu, Y.-L. Xu, and H. Jiang. 2017. “Seismic retrofitting of non-seismically designed RC beam-column joints using buckling-restrained haunches: Design and analysis.” J. Earthquake Eng. 1–21. https://doi/org/10.1080/13632469.2016.1277441.
Yakut, A. 2004. Reinforced concrete frame construction. Oakland, California: Earthquake Engineering Research Institute.
Yen, J. Y. R., and H. K. Chien. 2010. “Steel plates rehabilitated RC beam-column joints subjected to vertical cyclic loads.” Constr. Build. Mater. 24 (3): 332–339. https://doi.org/10.1016/j.conbuildmat.2009.08.029.
Youssef, M. A., M. S. Alam, and M. Nehdi. 2008. “Experimental investigation on the seismic behavior of beam-column joints reinforced with superelastic shape memory alloys.” J. Earthquake Eng. 12 (7): 1205–1222. https://doi.org/10.1080/13632460802003082.
Youssef, M. A., H. Ghaffarzadeh, and M. Nehdi. 2007. “Seismic performance of RC frames with concentric internal steel bracing.” Eng. Struct. 29 (7): 1561–1568. https://doi.org/10.1016/j.engstruct.2006.08.027.
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Published In
Journal of Structural Engineering
Volume 144 • Issue 10 • October 2018
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©2018 American Society of Civil Engineers.
History
Received: Jun 17, 2017
Accepted: Apr 6, 2018
Published online: Jul 9, 2018
Published in print: Oct 1, 2018
Discussion open until: Dec 9, 2018
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