Load and Deflection Recovery Capacities of PSC Girder with Unbonded PS H-Type Steel

Jong Wook Kim, Jang Ho Jay Kim, Tae Kyun Kim, Tae Hee Lee, Dal Hun Yang

Research output: Contribution to journalArticlepeer-review


Generally, a precast prestressed concrete (PSC) beam is used as girders for short-to-medium span (less than 30 m) bridges due to the advantages of simple design and construction, reduction of construction budget, maintenance convenience. In order to increase the span length beyond 50 m of precast PSC girder, PSC hollow box girder with unbonded prestressed H-type steel beam placed at the compressive region is proposed. The unbonded compressive prestressing in the H-type steel beams in the girder is made to recover plastic deflection of PSC girder when the pre-stressing is released. Also, the H-steel beams allow minimization of depth-to-length ratio of the girder by reducing the compressive region of the cross-section, thereby reducing the weight of the girder. A quasi-static 3-point bending test with 4 different loading steps is performed to verify safety and plastic deflection recovery of the girder. The experimental results showed that the maximum applied load exceeded the maximum design load and most of the plastic deflection was recovered when the compressive prestressing of H-type steel beams is released. Also using prestressed H-type steel as compression reinforcements in the upper part of cross section, repair and restoration difficulty and cost of PSC girders should be significantly reduced. The study result and analysis are discussed in detail in the paper.

Original languageEnglish
Pages (from-to)1336-1349
Number of pages14
JournalInternational Journal of Steel Structures
Issue number4
Publication statusPublished - 2018 Nov 1

Bibliographical note

Funding Information:
Acknowledgements This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Korea government (MSIT:Ministry of Science and ICT) (No. 2016R1A2B3009444).

Publisher Copyright:
© 2018, Korean Society of Steel Construction.

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering


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