In Situ Test of School Buildings Retrofitted with External Steel-Framing Systems
Publication: Journal of Structural Engineering
Volume 141, Issue 1
Abstract
In situ push-over experiments and analytical assessments were conducted in this study to investigate the seismic capacity of RC school buildings at the Guan-miao Elementary School in Tainan City, Taiwan. Both prototype and external steel-framing specimens were constructed and compared. Reinforcements with steel channels were adhered to the captive columns and their adjacent beams in the weak direction, to retrofit the school building through the creation of external steel-framing systems. The design and construction procedures of the beam-column connection are introduced, as well as detailed drawings of the column-base anchorage system, both of which are key to the effects of the proposed retrofitting method. The experimental results show that the steel-framing system can be firmly bonded to the retrofitted specimen, providing continuous stress transference from the beam-column joints to the steel channels. The failure mode of the retrofitted captive columns was shifted from shear failure, as seen with the prototype specimen, to flexural-shear failure, with the retrofitted one. Both the experimental and analytical results show the following: The maximum total base shear strength increases 2.11 times, the total enclosed area of the stored energy increases 2.20 times, and ductility capacity increases 1.31 times. The external steel-framing systems proposed in this work can thus effectively enhance the base shear strength and the ductility of the specimens.
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Acknowledgments
This study was supported by the National Science Council of the Republic of China under grant NSC-96-2625-Z-006-003. Funding for test specimens and experimental instrumentation was provided by the National Center for Research on Earthquake Engineering, Taiwan. The assistance of the Tainan County Government and Guan-miao Elementary School is highly appreciated. Dr. Shyh-Jiann Hwang, Professor at the Department of Civil Engineering at National Taiwan University and deputy director of the National Center for Research on Earthquake Engineering, provided the authors with enthusiastic support and guidance. The authors are also deeply indebted to the late Professor Yaw-Jeng Chiou of the Department of Civil Engineering, National Cheng Kung University, and former Chief of the National Center for Research on Earthquake Engineering experimental team, for his guidance.
References
Adhikary, B. B., and Mutsuyoshi, H. (2006). “Shear strengthening of RC beams with web-bonded continuous steel plates.” Constr. Build. Mater., 20(5), 296–307.
Barnes, R. A., Baglin, P. S., Mays, G. C., and Subedi, N. K. (2001). “External steel plate systems for shear strengthening of reinforced concrete beams.” Eng. Struct., 23(9), 1162–1176.
Chai, Y. H. (1996). “An analysis of the seismic characteristics of steel-jacketed circular bridge columns.” Earthquake Eng. Struct. Dyn., 25(2), 149–161.
Chai, Y. H., Priestley, J. N., and Seible, F. (1994). “Analytical model for steel-jacketed RC circular bridge columns.” J. Struct. Eng., 2358–2376.
Chinese Institute of Civil, and Hydraulic Engineering. (2007). “Design code for concrete engineering (Civil 401–96).” KeJiTuShu, Taipei, Taiwan, Republic of China.
Chiou, Y. J., Liou, Y. W., Mo, Y. L., Hsiao, F. P., Sheu, M. S., and Shih, C. T. (2003). “Repair of large scale reinforced concrete framed shear walls with opening.” ACI Struct. J., SP211(13), 263–292.
Chu, T. H., (2008). “Test on the tensile and shear forces sustained by chemical anchor bolts.” M.S. thesis, National Cheng Kung Univ., Taipei, Taiwan, Republic of China.
Chung, L. L., et al. (2009). “Technology handbook for seismic evaluation and retrofit of school buildings,” 2nd Ed., National Center for Research on Earthquake Engineering, Taipei, Taiwan, Republic of China.
Construction, and Planning Agency Ministry of the Interior. (2004). “Design code for steel reinforced concrete (SRC) structural buildings.” Taipei, Taiwan, Republic of China.
Construction, and Planning Agency Ministry of the Interior. (2006). “The seismic design code of buildings.” Taipei, Taiwan, Republic of China.
Elwood, K. J., and Moehle, J. P. (2005a). “Axial capacity model for shear damaged columns.” ACI Struct. J., 102(4), 578–587.
Elwood, K. J., and Moehle, J. P. (2005b). “Drift capacity of reinforced concrete columns with light transverse reinforcement.” Earthquake Spectra, 21(1), 71–89.
Fujikura, S., and Bruneau, M. (2011). “Experimental investigation of seismically resistant bridge piers under blast loading.” J. Bridge Eng., 63–71.
Griffith, M. C., Wu, Y. F., and Oehlers, D. J. (2005). “Behaviour of steel plated RC columns subject to lateral loading.” Adv. Struct. Eng., 8(4), 333–348.
Jaung, W. C., et al. (2008a). “In situ pushover test of school building structure in Kao-Hu Elementary School.” National Center for Research on Earthquake Engineering, Taipei, Taiwan, Republic of China.
Jaung, W. C., Chiou, T. C., Tu, Y. H., and Hwang, S. J. (2008b). “In situ pushover test of school building structure of Sin-Chen Junior High School in Hualien County.” J. Chin. Inst. Civ. Hydraul. Eng., 20(4), 495–507 (in Chinese).
Loh, C. H., and Sheu, M. S., (1999). “Initial survey report of the Chi-Chi earthquake.”, National Center for Research on Earthquake Engineering, Taipei, Taiwan, Republic of China.
Oh, B. H., Cho, J. Y., and Park, D. G. (2003). “Failure behavior and separation criterion for strengthened concrete members with steel plates.” J. Struct. Eng., 1191–1198.
Shih, C. T., Hsiao, F. P., Chiou, Y. J., Liou, Y. W., and Ruan, J. P. (2011). “Field test on RC school building with columns retrofitted by using RC jacketing.” J. Chin. Inst. Civ. Hydraul. Eng., 23(1), 25–40 (in Chinese).
Su, R. K. L., and Zhu, Y. (2005). “Experimental and numerical studies of external steel plate strengthened reinforced concrete coupling beams.” Eng. Struct., 27(10), 1537–1550.
Subedi, N. K., and Baglin, P. S. (1998). “External plate reinforcement for concrete beams.” J. Struct. Eng., 1490–1495.
Uy, B. (2002). “Strength of reinforced concrete columns bonded with external steel plates.” Mag. Concr. Res., 54(1), 61–76.
Weng, Y. T., Lin, K. C., Hwang, S. J., and Chiou, T. C. (2008). “In situ pseudo-dynamic test and cyclic pushover test of existing school buildings.”, National Center for Research on Earthquake Engineering, Taipei, Taiwan, Republic of China.
Xiao, Y., and Wu, H. (2003). “Retrofit of reinforced concrete columns using partially stiffened steel jackets.” J. Struct. Eng., 725–732.
Ziraba, Y. N., Baluch, M. H., Basunbul, I. A., Sharif, A. M., Azad, A. K., and Al-Sulaimani, G. J. (1994). “Guidelines toward the design of reinforced concrete beams with external plate.” ACI Struct. J., 91(6), 639–646.
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Published In
Journal of Structural Engineering
Volume 141 • Issue 1 • January 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: May 1, 2013
Accepted: Feb 25, 2014
Published online: Jul 8, 2014
Discussion open until: Dec 8, 2014
Published in print: Jan 1, 2015
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