Abstract
A new technique based on the use of high-performance fibre-reinforced concrete (HPFRC) in seismic structural walls with unbonded tendons is investigated herein. The aim of using this kind of structural wall, which develops a rocking behaviour under horizontal loading, is to limit or avoid damage during seismic events. The technique consists of strengthening the base of reinforced concrete (RC) walls provided with unbonded tendons by replacing the regular concrete at the wall toes with HPFRC, which can enhance the wall properties and be used to strengthen or repair existing RC walls. A full-scale test was performed on a rocking wall, before and after strengthening at the wall toes. Local deformations at the toes were measured in detail to quantify the extent of concrete damage in relation to wall drift and to assist future theoretical modelling. The results show that the strengthening technique can considerably limit damage at the ultimate state.
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References
Mander JB, Cheng C-T (1997) Seismic resistance of bridges based on damage avoidance design. NCEER, technical report 97-0014, December 10
Kurama Y, Sause R, Pessiki S, Lu LW, El-Sheikh M (1998) Seismic design and response evaluation of unbonded post-tensioned precast concrete walls. Precast seismic Structural Systems (PRESSS), Rep. no. 98/03, Lehigh University, Lehigh, Pa., Rep. no. EQ-97-01
Priestley MNJ, Sritharan S, Conley JR, Pampanin S (1999) Preliminary results and conclusions from the PRESSS five-story precast concrete test building. PCI J 44(6):42–67
Holden T, Restrepo JI, Mander JB (2003) Seismic performance of precast reinforced and prestressed concrete walls. J Struct Eng ASCE 129(3):286–296
Ajrab JJ, Pekcan G, Mander JB (2004) Rocking wall-frame structures with supplemental tendon systems. J Struct Eng ASCE 130(6):895–903
Marini A, Riva P, Fattori L (2007) Repair and retrofitting of structural RC walls by means of post-tensioned tendons. In: Proceedings of the 6th international conference on fracture mechanics of concrete and concrete structures 2, Catania, Italy, pp 1157–1165
Solberg K, Mashiko N, Mander JB, Dhakal RP (2009) Performance of a damage-protected highway bridge pier subjected to bi-directional earthquake attack. J Struct Eng ASCE 135(5):469–478
Preti M, Marini A, Metelli G, Giuriani E (2009) Full scale experimental investigation on a prestressed rocking structural wall with unbonded steel dowels as shear keys. In: Proceedings of the XIII conference ANIDIS 2009, Bologna, ISBN 978-88-904292-0-0
Preti M, Giuriani E (2011) Ductility of a structural wall with spread rebars tested in full scale. J Earthquake Eng 15(8):1238–1259. doi:10.1080/13632469.2011.557139
Toranzo LA, Restrepo JI, Mander JB, Carr AJ (2009) Shake-table tests of confined-masonry rocking walls with supplementary hysteretic damping. J Earthquake Eng 13(6):882–898. doi:10.1080/13632460802715040
CEN (2009) EN 12390-3:2009—testing hardened concrete—part 3: compressive strength of test specimens. European Committee for Standardization, Brussels
CEN (2004) Eurocode 2: design of concrete structures, part 1–1: general rules and rules for buildings, EN 1992-1-1: 2004. European Committee for Standardization, Brussels
NEHRP (2004) NEHRP recommended provisions for seismic regulations for new buildings and other structures (FEMA 450), 2003 edn—part 1. Building Seismic Safety Council—National Institute of Building Sciences, Washington, DC
Acknowledgements
The experimental test was partly financed by MIUR (Ministry of Education, University and Research) as part of PRIN 2004 (Research Programme of National Interest). The contribution of UNIECO S.c.r.l., Calcestruzzi S.p.A., Ferriera Valsabbia S.p.A. and Axim Italia S.p.A. allowed the construction of the experimental wall apparatus. The wall strengthening material was kindly offered by Tecnochem Italiana S.p.A. The authors gratefully acknowledge all the supporters. The authors are grateful to P. Spatti, D. Finazzi, L. Zanetti, M. Salami and D. Fiorillo, who assisted us in designing and testing the wall, and to the staff of Brescia University’s P. Pisa Laboratory. Lastly, our special thanks go to Prof. Ezio Giuriani for his fruitful discussions with us and his invaluable suggestions.
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Preti, M., Meda, A. RC structural wall with unbonded tendons strengthened with high-performance fiber-reinforced concrete. Mater Struct 48, 249–260 (2015). https://doi.org/10.1617/s11527-013-0180-8
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DOI: https://doi.org/10.1617/s11527-013-0180-8