This study investigates the torsional behavior within the geometric range of the curved PSC bridge designed and constructed in the recent work. Compared with the design specifications for torsion on the Korean Highway Bridge Design Specification(2010), the reasonable torsional reinforcement design criteria are reviewed and proposed for curved PSC girder. A numerical study investigates the torsional behavior of a curved PSC box girder. From the study on the geometrical shape of the curved beam and the torsion caused by the eccentric load of the vehicle load in this study, the following results were derived: the design criteria for diaphragm and crossbeam as presented in the current Korean Highway Bridge Design Specifications (2010 & 2015) are based on the single PC box bridge applied by the FCM or ILM method, therefore the criteria is very conservative about the multi-box girder bridge type bridge in this study.

• 우정원(서울시립대학교 박사과정, 한국도로공사 동서울지사장) | Woo, Jeong-Won (Chief of Dongseoul Maintenance Office, Korea Expressway Corporation)
• 임성순(서울시립대학교 토목공학과 교수) | Yhim Sung-soon (Professor, Department of Civil Engineering, University of Seoul) Corresponding author