Code Based Performance Prediction for a Full-Scale FRP Retrofitted Building Test
Lack of adequate ductility in substandard reinforced concrete buildings is a major reason for significant amount of life and economic losses experienced during major earthquakes. Laboratory tests realized at member level (i.e. column and beam tests) show that external wrapping of potential plastic hinging regions of columns with Fiber Reinforced Polymer (FRP) sheets, can significantly enhance the ductility capacity. Thus, major seismic retrofitting documents available worldwide interpret this retrofit approach as a viable alternative and lay the rules for retrofit design with these materials. In this study, a very recent experimental activity that included the full-scale testing of a substandard building retrofitted with the above mentioned approach is briefly presented. Then, the performance prediction of the Turkish Seismic Design Code (2007) for this building is evaluated. Finally, a revision is proposed for the FRP effective rupture strain value defined by this code.
KeywordsDuctility Earthquakes Laboratory tests Full-scale testing
Authors are thankful to DowAksa Advanced Composites Holding B.V. and Governorship of Yalova for various supports provided for experimental studies. The contributions of Ilgaz Doğan (DowAksa), Çağlar Göksu Akkaya (Ph.D., ITU), Pınar İnci (Ph.D. Cand., ITU), Ergün Binbir (Ph.D. Cand., ITU), Ali Osman Ateş (Ph.D. Cand., ITU), Ali Naki Şanver (M.Sc. Cand., Rise Eng.), Çağlar Üstün (M.Sc. Cand., RISE Eng.), Duygu Çakır (Civil Eng., Rise Eng.), Gökhan Sarı (Undergrad., Balıkesir University), Emin Amini (Undergrad., Balıkesir University), Tamer Şahna (Undergrad., Balıkesir University), Oğuzhan Sözer (Undergrad., Balıkesir University), Berkay Aldırmaz (M.Sc. Cand., ITU), Ömer Faruk Halıcı (M.Sc., ITU), Mehmet Aksa (Undergrad., Kultur Uni.) are also gratefully acknowledged.
- ACI Committee 440 (2017) Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures ACI 440.2R-17. American Concrete Institute, Farmington Hills, MichGoogle Scholar
- fib Bulletin 14 (2001) Externally bonded FRP reinforcement for RC structures. Lausanne, SwitzerlandGoogle Scholar
- Garcia R, Hajirasouliha I, Guadagnini M, Helal Y, Jemaa Y, Pilakoutas K, Mongabure P, Chrysostomou C, Kyriakides N, Ilki A, Budescu M, Taranu N, Ciupala MA, Torres L, Saiidi M (2014) Full-scale shaking table tests on a substandard RC building repaired and strengthened with post-tensioned metal straps. J Earthquake Eng 18(2):187–213CrossRefGoogle Scholar
- Ilki A, Kumbasar N (2002) Behavior of damaged and undamaged concrete strengthened by carbon fiber composite sheet. Int J Str Eng Mech 13(1):75–90Google Scholar
- Ilki A, Kumbasar N (2003) Compressive behaviour of carbon fiber composite jacketed concrete with circular and non-circular cross-sections. J Earthquake Engineering 7(3):381–406Google Scholar
- Tore E, Comert M, Demir C, Ilki A (2017) Collapse testing of full-scale RC buildings with or without seismic retrofit of columns with FRP jackets. In: Paper presented at COST Action TU1207 end of action conference, Budapest, Hungary, 3–5 April 2017Google Scholar
- TSDC Turkish Seismic Design Code (2007) Specification for the buildings to be constructed in disaster areas. Ministry of Public Works and Settlement, Ankara, TurkeyGoogle Scholar