ENG  Vol.7 No.3 , March 2015
Load Transfer Test of Post-Tensioned Anchorage Zone in Ultra High Performance Concrete
ABSTRACT
Researches on ultra-high performance concrete (UHPC) have been conducted worldwide owing to its outstanding durability and strength performances. The exploitation of the mechanical properties of UHPC will render it possible to achieve economic design through substantial reduction in the cross sectional dimensions and simplification in the reinforcement arrangement. This paper investigates experimentally the load transfer in the prestressed concrete anchorage zone. To provide distinctive features of UHPC compared to ordinary concrete, the cross sectional dimensions of the member were reduced and the stress distribution, deformation and cracking pattern of the PS anchorage zone were examined experimentally according to the degree of reinforcement of the members chosen. The distributions of the bursting stress, spalling stress and longitudinal edge stress in the specimens were observed according to the various types of reinforcement. All the specimens satisfied the load-bearing capacity criterion specified by the European ETAG-013 guidelines and their stress distributions were similar to those in the PS anchorages of post-tensioned members applying ordinary concrete. The cracks propagated longitudinally with lengths up to twice the cross sectional dimensions and their width was smaller than when applying ordinary concrete owing to the bridging effect of the steel fibers in UHPC. Accordingly, the exploitation of the high strength of UHPC enabled us to secure the resistance of the anchorage with no need for particular reinforcing devices.

Cite this paper
Kim, J. , Joh, C. and Choi, Y. (2015) Load Transfer Test of Post-Tensioned Anchorage Zone in Ultra High Performance Concrete. Engineering, 7, 115-128. doi: 10.4236/eng.2015.73010.
References
[1]   Graybeal, B. (2011) Ultra-High Performance Concrete. Technote, FHWA-HRT-11-038, Federal Highway Administration, McLean.

[2]   Russell, H.G. and Graybea, B.A. (2013) Ultra-High Performance Concrete: A State-of-the-Art Report for the Bridge Community, FHWA-HRT-13-060.

[3]   Toutlemonde, F., et al. (2009) Efforts et Acquis de Recherchesur les BFUP depuis 2002 en vue del’Actualisation des Recommandations de l’AFGC. (An Overview of Research Advances from 2002 Concerning UHPFRC, in View of Updating AFGC Recommendations). Proceedings of the International Workshop on Ultra High Performance Fibre Reinforced Concrete—Designing and Building with UHPFRC: State of the Art Development, Marseille, 17-19 November 2009, AFGC/fib, Paper 5.3.4.

[4]   Resplendino, J. (2009) Bétons Fibrés Ultra Performant (BFUP)—Les Nouvelles Recommandations AFGC. (Updated AFGC Recommendations). Proceedings of the International Workshop on Ultra High Performance Fibre Reinforced Concrete—Designing and Building with UHPFRC: State of the Art Development, Marseille, 17-19 November 2009, AFGC/fib, Paper 6.1.1.

[5]   Schmidt, M. (2012) Sustainable Building with Ultra-High-Performance Concrete (UHPC)—Coordinated Research Program in Germany. In: Schmidt, M., Fehling, E., Glotzbach, C., Fröhlich, S. and Piotrowski, S., Eds., Proceedings of Hipermat 2012 3rd International Symposium on UHPC and Nanotechnology for High Performance Construction Materials, Kassel University Press, Kassel, 17-25.

[6]   Japan Society of Civil Engineers (JSCE) (2006) Recommendations for Design and Construction of Ultra High Strength Fiber Reinforced Concrete Structures (Draft). JSCE Guidelines for Concrete No. 9.

[7]   Kim, B.-S., et al. (2012) R&D Activities and Application of Ultra High Performance Concrete to Cable-Stayed Bridges. In: Schmidt, M., Fehling, E., Glotzbach, C., Fröhlich, S. and Piotrowski, S., Eds., Proceedings of Hipermat 2012 3rd International Symposium on UHPC and Nanotechnology for High Performance Construction Materials, Kassel University Press, Kassel, 865-872.

[8]   Toutlemonde, F., Renaud, J.-C., Lauvin, L., Behloul, M., Simon, A. and Vildare, S. (2007) Testing and Analysing Innovative Design of UHPFRC Anchor Blocks for Post-Tensioning Tendons. 6th International Conference on Fracture Mechanics of Concrete and Concrete Structures (FRAMCOS-6), Catania, 17-22.

[9]   EOTA (2002) ETAG-013: Guideline for European Technical Approval of Post-Tensioning Kits for Prestressing of Structures.

[10]   Ministry of Land, Transport and Maritime Affairs (2010) Korean Highway Bridge Design Code (in Korean).

[11]   Kim, J.S., Kwark, J.W., Joh, C.B. and Choi, Y.S. (2011) Bursting Forces of Anchorage Zone in UHPC Post-Tensioned Members Considering the Size of Anchorage Plates. Conference of KSCE, 30, 1388-1391 (in Korean).

 
 
Top