Browse > Article
http://dx.doi.org/10.11112/jksmi.2014.18.4.077

Reduction of Prestress Loss in PSC (Prestressed Concrete) Continuous Girder by Employing Block-out Method  

Shin, Kyung-Joon (충남대학교 토목공학과)
Kim, Yun-Yong (충남대학교 토목공학과)
Kim, Seung-Jin (부경대학교 토목공학과)
Choo, Tae-Heon ((주)성환이앤씨)
Lee, Hwan-Woo (부경대학교 토목공학과)
Publication Information
Journal of the Korea institute for structural maintenance and inspection / v.18, no.4, 2014 , pp. 77-83 More about this Journal
Abstract
Prestressed concrete girder bridge has been one of the most widely used bridges in the world because of its excellent construction feasibility, economic efficiency, serviceability, and safety. In certain situations, the prestressing tendon is supposed to be bent by the construction error and the radius of curvature at the continuous joint of PSC girders, and this leads to the loss of prestressing force. However, this kind of prestress loss is not considered in the design and construction processes. This study proves that the prestress loss occurs at the continuous joint due to the local bending of tendon by the construction error or the radius of curvature. Also, a method that can reduce this type of prestress loss is proposed, and proved by the experiment. The result shows that maximum 10% of prestress loss occurs at the continuous joint and the proposed block-out method can reduce the prestress loss ratio by maximum 5%, approximately. This means that the block-out method can enhance the prestressing efficiency of continuous PSC girder bridges.
Keywords
PSC girder; Continuous span; Prestresss loss;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 Chandra, V., and Warshaw, R. (2004), Historical perspective in the development of precast prestressed concrete bridges, PCI Journal, 49(6), 56-69.
2 Chung, C. H., and Hyun, B. H. (2007), Continuity of PSC Composite Bridge with Precast Decks, KSCE Anual conference, 27-4A, 561-568 (in Korean).
3 Han, M. Y. (2010), A revolutionary design for post-tensioned I-type bridges girders, ACF 2010 Proceedings, Taipei.
4 Han, M. Y., Kim, J. G., Hwang, E. S., Lee, C. D., and Park, S. I. (2000), IPC Girder: The Lowest Height/Length Ratio Girder A revolutionary design for post-tensioned I-type bridges girders, Journal of the Korea Concrete Institute, 12(1), 50-59 (in Korean).
5 KEC (2001), Quality Management Practices, Korea Expressway Corporation (in Korean).
6 Kim, et al. (2004), Establishment of advanced design for material quantity reduction and quality improvement of PSC box girder bridges, KICT (Korea Institute of Construction Technology) (in Korean).
7 Kim, Y. H., Ra, J. K., Kim, T. H., and Shin, H. M. (2003), Analytical Study on the Prestress Losses of Prestressed Concrete Bridges, Journal of the Korea Institute for Structural Maintenance Inspection, 7(1), 131-138 (in Korean).
8 MOLIT (1999), Standard Specifications for Highway Bridges, Ministry of Land, Infrastructure and Transport (in Korean).
9 MOLIT (2005), Standard Specifications for Highway Bridges, Ministry of Land, Infrastructure and Transport (in Korean).
10 Oh, B. H., Yang, I. H, and Kim, J. S. (2001), A Study on the Estimation of Prestress Losses in Prestressed Concrete Box Girder Bridges, Journal of the Korea Institute for Structural Maintenance Inspection, 5(2), 111-120 (in Korean).
11 MOLIT (2009), Status report of road bridges and tunnels, Ministry of Land, Infrastructure and Transport (in Korean).
12 Nawy, Edward G. (2009), Prestressed Concrete Fifth Edition.
13 MOLIT (2010), Bridge Design Specifications for Highway Bridges, Ministry of Land, Infrastructure and Transport (in Korean).