RESEARCH ON THE NEW CFRP PRESTRESSING SYSTEM FOR STRENGTHENING OF RC STRUCTURES

PIĄTEK, Bartosz; SIWOWSKI, Tomasz

doi:10.21307/acee-2017-035

Abstract

The paper presents a research on the new Polish CFRP prestressing system for strengthening of reinforced concrete structures. The system is called Neoxe Prestressing System II (NPS II). NPS II consists of two main elements: a special steel anchorages mounted on both ends of a single CFRP strip and a tensioning device. The anchorage is made of two steel plates. CFRP strip end is fixed between steel plates through bonding by epoxy resin and gripping by bolts. The tensioning device compatible with anchorages can generate maximum prestressing force of 170 kN. The research on NPS II comprised a series of static and fatigue tests on anchorages themselves, system mounted on strengthened beams as well as on-site, i.e. on actual RC bridge. The system has been examined, its efficiency has been confirmed in laboratory and in field tests and now it is ready to use in strengthening purposes.

References

Andrä, H. P. & Maier, M. (2000). Post-strengthening with Externally Bonded Prestressed CFRP Strips. IABSE Congress Report, 16(7), 1507–1514.
Search in Google Scholar Back to article
Berset, T., Schwegler, G. & Trausch, L. (2002). Verstärkung einer Autobahnbrücke mit vorgespan- nten CFK-Lamellen. tec21, 128(22), 27–29.
Search in Google Scholar Back to article
Suter, R. & Jungo, D. (2001). Vorgespannte CFK- Lamellen zur Verstärkung von Bauwerken. Beton- und Stahlbetonbau, 96(5), 350–358.10.1002/best.200100370
Search in Google Scholar Back to article
Michels, J., Sena-Cruz, J., Czaderski, C. & Motavalli, M. (2013). Structural Strengthening with Prestressed CFRP Strips with Gradient Anchorage. Journal of Composites for Construction, 17(5), 651–661.10.1061/(ASCE)CC.1943-5614.0000372
Search in Google Scholar Back to article
Haghani, R., Al-Emrani, M. & Kliger, R. (2015). A New Method for Strengtheng Concrete Structures Using Prestressed FRP Laminates. In: Saha, S., Lloyd, N., Yazdani, S. & Singh, A. (Eds.), Implementing Innovative Ideas in Structural Engineering and Project Management. ISEC Press.
Search in Google Scholar Back to article
Aslam, M., Shafigh, P., Jumaat, M. Z. & Shah, S. N. R. (2015). Strengthening of RC Beams Using Prestressed Fiber Reinforced Polymers – a Review. Construction and Building Materials, 82, 235–256.10.1016/j.conbuildmat.2015.02.051
Search in Google Scholar Back to article
Przygocka, M., Lasek, K., & Kotynia, R. (2015). Strengthening of RC slabs with prestressed and nonprestressed NSM CFRP strips. Architecture Civil Engineering Environment, 8(3), 79–86.
Search in Google Scholar Back to article
Łagoda, M. (2004). Element Strengthening by Stressed Composite Strip – an Example of Experimental Investigation. Archives of Civil Engineering, 50(4), 599–623.
Search in Google Scholar Back to article
Siwowski, T., Michałowski, J. & Błażewicz, S. (2010). Nowy system sprężania taśm kompozytowych CFRP do wzmacniania konstrukcji żelbetowych (The New CFRP Prestressing System for Strengthening Concrete Structures). Inżynieria i Budownictwo, 66, 152–156.
Search in Google Scholar Back to article
Meier U. (1995). Strengthening of structures using carbon fibre/epoxy composites. Construction and Building Materials, 9(6), 341–351.10.1016/0950-0618(95)00071-2
Search in Google Scholar Back to article

RESEARCH ON THE NEW CFRP PRESTRESSING SYSTEM FOR STRENGTHENING OF RC STRUCTURES

Abstract

Paradigm

My account