Rapid repair of RC columns with post-tensioned external clamps
DOI:
https://doi.org/10.5459/bnzsee.1653Abstract
A recent technique for repair of damaged reinforced concrete (RC) columns is reviewed. The technique involves the application of external post-tensioned clamps. The clamps are composed of steel angles and high-strength steel rods. The pairs of angles are placed on the corners of the cross-section, and they are connected with steel rods to each other. To evaluate the effectiveness of the repair technique, four large-scale RC columns with insufficient transverse reinforcement were subjected to lateral displacement reversals and constant axial load. The tests were conducted in two phases: initial testing of columns with none to light transverse reinforcement, followed by the application of clamps on the damaged columns and further testing. The study focused on the efficacy of the clamps to a) restore the lateral-carrying capacity of damaged RC columns, and b) increase drift capacity. Variations in lateral expansion of the column core and their plausible correlations with damage and ‘repairability’ are examined. Within the conditions investigated, two key requirements are proposed for safe column repair: 1) the concrete in damaged columns with cross-sectional expansion exceeding 1% should be replaced or repaired before clamps are applied as a repair measure, and 2) clamps should be proportioned to resist 100% of the maximum plausible shear demand even though perceptible contributions to shear resistance attributable to the concrete were observed in columns repaired before excessive expansion occurred. In columns with crisscrossing inclined cracks leading to lateral cross-sectional expansion of up to 1%, clamps were observed to provide effective shear resistance comparable to what conventional transverse reinforcement can provide.
References
DeBlasio AJ, Zamora A, Mottley F, Brodesky R, Zirker ME, Crowder M and John A (2002). "Effects of Catastrophic Events on Transportation System Management and Operations: Northridge Earthquake, January 17, 1994. United States". Volpe National Transportation Systems Center, Joint Program Office for Intelligent Transportation Systems, USA. https://rosap.ntl.bts.gov/view/dot/39118
Decanini LD, De Sortis A, Goretti A, Liberatore L, Mollaioli F and Bazzurro P (2004). "Performance of reinforced concrete buildings during the 2002 Molise, Italy, earthquake". Earthquake Spectra, 20: 221–255. https://doi.org/10.1193/1.1765107 DOI: https://doi.org/10.1193/1.1765107
Bayraktar A, Altunişik AC and Pehlivan M (2013). "Performance and damages of reinforced concrete buildings during the October 23 and November 9, 2011 Van, Turkey, earthquakes". Soil Dynamics and Earthquake Engineering, 53: 49–72. https://doi.org/10.1016/j.soildyn.2013.06.004 DOI: https://doi.org/10.1016/j.soildyn.2013.06.004
Baran E, Mertol HC and Gunes B (2014). "Damage in reinforced concrete buildings during the 2011 Van, Turkey, earthquakes". Journal of Performance of Constructed Facilities, American Society of Civil Engineers (ASCE), 28: 466–479. https://doi.org/10.1061/(ASCE)CF.1943-5509.0000396 DOI: https://doi.org/10.1061/(ASCE)CF.1943-5509.0000396
Vandoros KG and Dritsos SE (2008). "Concrete jacket construction detail effectiveness when strengthening RC columns". Construction and Building Materials, 22: 264–276. https://doi.org/10.1016/j.conbuildmat.2006.08.019 DOI: https://doi.org/10.1016/j.conbuildmat.2006.08.019
Lehman DE, Gookin SE, Nacamuli AM and Moehle JP (2001). "Repair of earthquake-damaged bridge columns". ACI Structural Journal, American Concrete Institute, 98: 233–242. https://doi.org/10.14359/10192 DOI: https://doi.org/10.14359/10192
Priestley MJN, Seible F, Xiao Y, et al. (1994). "Steel jacket retrofitting of reinforced concrete bridge columns for enhanced shear strength - Part 2: Test results and comparison with theory". Structural Journal, 91: 537–551. https://www.concrete.org/publications/internationalconcreteabstractsportal/m/details/id/4168 DOI: https://doi.org/10.14359/4168
Aboutaha RS, Engelhardt MD, Jirsa JO and Kreger ME (1999). "Rehabilitation of shear critical concrete columns by use of rectangular steel jackets". ACI Structural Journal, American Concrete Institute, 96: 68–78. https://doi.org/10.14359/597 DOI: https://doi.org/10.14359/597
Fakharifar M, Chen G, Sneed L and Dalvand A (2015). "Seismic performance of post-mainshock FRP/steel repaired RC bridge columns subjected to aftershocks". Composites Part B Engineering, 72: 183–198. https://doi.org/10.1016/j.compositesb.2014.12.010 DOI: https://doi.org/10.1016/j.compositesb.2014.12.010
Fakharifar M, Chen G, Wu C, Shamsabadi A, ElGawady MA and Dalvand A (2016). "Rapid repair of earthquake-damaged RC columns with prestressed steel jackets". Journal of Bridge Engineering, American Society of Civil Engineers (ASCE), 21: 04015075. https://doi.org/10.1061/(asce)be.1943-5592.0000840 DOI: https://doi.org/10.1061/(ASCE)BE.1943-5592.0000840
Chang S-Y, Li Y-F and Loh C-H (2004). "Experimental study of seismic behaviors of as-built and carbon fiber reinforced plastics repaired reinforced concrete bridge columns". Journal of Bridge Engineering, American Society of Civil Engineers (ASCE), 9: 391–402. https://doi.org/10.1061/(ASCE)1084-0702(2004)9:4(391) DOI: https://doi.org/10.1061/(ASCE)1084-0702(2004)9:4(391)
Rutledge ST, Kowalsky MJ, Seracino R and Nau JM (2014). "Repair of reinforced concrete bridge columns containing buckled and fractured reinforcement by plastic hinge relocation". Journal of Bridge Engineering, American Society of Civil Engineers (ASCE), 19: A4013001. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000492 DOI: https://doi.org/10.1061/(ASCE)BE.1943-5592.0000492
Yang Y, Sneed L, Saiidi MS, Belarbi A, Ehsani M and He R (2015). "Emergency repair of an RC bridge column with fractured bars using externally bonded prefabricated thin CFRP laminates and CFRP strips". Composite Structures, 133: 727–738. https://doi.org/10.1016/j.compstruct.2015.07.045 DOI: https://doi.org/10.1016/j.compstruct.2015.07.045
Bouchelaghem H, Bezazi A and Scarpa F (2011). "Compressive behaviour of concrete cylindrical FRP-confined columns subjected to a new sequential loading technique". Composites Part B Engineering, 42: 1987–1993. https://doi.org/10.1016/j.compositesb.2011.05.045 DOI: https://doi.org/10.1016/j.compositesb.2011.05.045
Ispir M, Dalgic KD and Ilki A (2018). "Hybrid confinement of concrete through use of low and high rupture strain FRP". Composites Part B Engineering, 153: 243–255. https://doi.org/10.1016/j.compositesb.2018.07.026 DOI: https://doi.org/10.1016/j.compositesb.2018.07.026
Wahab S and Hussain C (2019). "Performance of concrete confined with a jute–polyester hybrid fiber reinforced polymer composite: A novel strengthening technique". Fibers (Basel, Switzerland), MDPI AG, 7: 72. https://doi.org/10.3390/fib7080072 DOI: https://doi.org/10.3390/fib7080072
Ishibashi T, Tsuyoshi T and Kobayashi K (2004). "Seismic retrofitting methods newly developed for railway concrete structures". Journal of Advanced Concrete Technology, 2: 65–76. https://doi.org/10.3151/jact.2.65 DOI: https://doi.org/10.3151/jact.2.65
Reddit. External Reinforcement in Shinkansen RC Columns near Fukuyama Station in Japan. https://www.reddit.com/r/InfrastructurePorn/comments/b52j1e/external_reinforcement_of_concrete_pillars_for/
Lunoe RR and Willis A (1957). "Application of steel strap reinforcement to girders of rigid frames, special AMC warehouses". Journal Proceedings. https://www.concrete.org/publications/internationalconcreteabstractsportal/m/details/id/11541
Yamakawa T, Kooroush NN and Satoh H (2001). "Seismic or emergency retrofit of RC short columns by use of prestressed Aramid fiber belts as external hoops". Journal of Structural and Construction Engineering, Architectural Institute of Japan, 66: 135–141. https://www.jstage.jst.go.jp/article/aijs/66/550/66_KJ00004101651/_article/-char/ja/ DOI: https://doi.org/10.3130/aijs.66.135_4
Miyagi T, Yamakawa T, Li W and Rahman M (2004). "A study on emergency retrofit using prestressing bars and steel plates for damaged columns". Proceedings of Thirteenth World Conference on Earthquake Engineering. http://www.iitk.ac.in/nicee/wcee/article/13_1169.pdf
Kyoda N, Yamakawa T, Nakada K, Javadi P and Nagahama A (2011). "Emergency retrofit for damaged RC columns by fiber belts prestressing and plywoods". Advances in FRP Composites in Civil Engineering, 801–805. https://doi.org/10.1007/978-3-642-17487-2_176 DOI: https://doi.org/10.1007/978-3-642-17487-2_176
Jung D, Wilcoski J and Andrawes B (2018). "Bidirectional shake table testing of RC columns retrofitted and repaired with shape memory alloy spirals". Engineering Structures, 160: 171–185. https://doi.org/10.1016/j.engstruct.2017.12.046 DOI: https://doi.org/10.1016/j.engstruct.2017.12.046
Lagoudas DC. Shape Memory Alloys. Springer US. https://doi.org/10.1007/978-0-387-47685-8 DOI: https://doi.org/10.1007/978-0-387-47685-8
Yamakawa T, Kamogawa S and Kurashige M (2000). "Seismic performance and design of RC columns retrofitted by PC bar prestressing as external hoops". Journal of Structural and Construction Engineering, AIJ, 537: 107–113. https://ci.nii.ac.jp/naid/10018682035/ DOI: https://doi.org/10.3130/aijs.65.107_4
Skillen KC (2020). "The Effects of Transverse Reinforcement on the Strength and Deformability of RC Elements". PhD Dissertation, University of Purdue. https://hammer.figshare.com/articles/thesis/The_Effects_of_Transverse_Reinforcement_on_the_Strength_and_Deformability_of_Reinforced_Concrete_Elements/13377242
Rincon JD, Skillen KC, Pujol S, Chen Y-M, Puranam AY and Hwang AS-J (2023). "Active confinement of RC columns with external post-tensioned clamps". ACI Symposium Publication, 358. https://doi.org/10.14359/51740233 DOI: https://doi.org/10.14359/51740233
Rincon JD, Chen YM, Pujol S, Puranam AY and Hwang SJ (2024). "Shear strength of reinforced concrete columns with external post-tensioned clamps". ACI Structural Journal, American Concrete Institute, 121. https://doi.org/10.14359/51740248 DOI: https://doi.org/10.14359/51740248
Rincon JD, Chen YM, Pujol S, Puranam AY, Hwang SJ and Hibino Y (2024). "Drift capacity of RC columns strengthened with post-tensioned external clamps. ACI Structural Journal, (In Review).
Richart FE (1927). An Investigation of Web Stresses in Reinforced Concrete Beams. University of Illinois.
Hognestad E (1951). "Study of combined bending and axial load in reinforced concrete members". Bulletin of Illinois Engineering Experiment Station. ideals.illinois.edu. https://www.ideals.illinois.edu/items/4902/bitstreams/19186/object
Nokes R (2020). Streams Version 3.03 - System Theory and Design.
Ottenhaus L-M, Li M, Nokes R, Cammock P and McInnes B (2019). "Use of particle tracking velocimetry in timber material and connection testing". European Journal of Wood and Wood Products, 77: 195–209. https://doi.org/10.1007/s00107-018-1376-y DOI: https://doi.org/10.1007/s00107-018-1376-y
Brown J, Li M, Nokes R, Palermo A, Pampanin S and Sarti F (2020). "Investigating the compressive toe of post-tensioned CLT core-walls using particle tracking technology". 17th World Conference on Earthquake Engineering (17WCEE), Sendai, Japan.
Ramirez JA, Pujol S and Sozen MA (1999). "Drift capacity of reinforced concrete columns subjected to cyclic shear reversals". Special Publication 187: 255–274. ftp://jetty.ecn.purdue.edu/spujol/CE571/Drift%20Capacity%20Summary%20and%20References/1.%20Column%20Drift%20Capacity%20-%20sp187-12%20[RAMIREZ].pdf
Brown RH and Jirsa JO (1971). "Reinforced concrete beams under load reversals". Journal Proceedings. https://www.concrete.org/publications/internationalconcreteabstractsportal.aspx?m=details&i=11338&m=details&i=11338
Wight JK and Sozen MA (1973). "Shear strength decay in reinforced concrete columns subjected to large deflection reversals". University of Illinois. Engineering Experiment Station. http://www.ideals.illinois.edu/bitstream/handle/2142/13817/SRS-403.pdf?sequence=2
Popov EP, Bertero VV and Krawinkler H (1972). "Cyclic behavior of three reinforced concrete flexural members with high shear". Earthquake Engineering Research Center, College of Engineering, University of California. https://play.google.com/store/books/details?id=keSiAQAACAAJ
Pujol S, Sozen M and Ramirez J (2006). "Displacement history effects on drift capacity of reinforced concrete columns". ACI Structural Journal, American Concrete Institute, 103. https://doi.org/10.14359/15183 DOI: https://doi.org/10.14359/15183
