Genetic Analysis and Repair of Cracks in Prestressed Concrete Box Girders during Precast Period

Abstract:

During the initial period of precast prestressed concrete box girders in a bridge, some cracks appeared in five box girders. The paper describes the crack states including location, elongation, space, width and depth. The geneses of the cracks are analyzed considering the concrete proportion, environmental condition and construction procedure. Four of them were permitted to be used after mending of these cracks and another one was abandoned directly. After the preventing measurement was adopted, no cracks appeared in the follow-up precast box girders. The experience can be as reference for the similar construction works.

• Periodical: Advanced Materials Research (Volume 366)
• Pages: 55-58
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.366.55
• Online since: October 2011
• Authors: Shi Ming Liu, Shun Bo Zhao
• Keywords: Bridge Engineering, Crack, Genetic Analysis, Prestressed Concrete Box Girder, Repair

References

[1] G. Zhao and S. Li: Crack Control of Reinforced Concrete Structures (Maritime Press, Beijing, 1991), in Chinese.

[2] S. Zhao: Design Principles of Concrete Structures (Tongji University Press, Shanghai, 2004), in Chinese.

[3] X. Li, S. Zhao and S. Pei: Harbor Technology, No. 3 (2005), pp.25-26, in Chinese.

[4] GB50376-2006: Design Code for Strengthening Concrete Structures (China Building Industry Press, Beijing, 2006), in Chinese.

[5] S. Zhao: Tests for Engineering Structures (Yellow River Conservancy Press, Zhengzhou, China 2001), in Chinese.