Dynamic Characteristics of Spliced Precast Concrete Box Girder

분절 프리캐스트 콘크리트 중공 거더의 동특성 시험

This paper is to investigate the dynamic characteristics of prestressed concrete (PSC) girder that has been spliced with precast box segments. A 20 m long full-scale spliced precast concrete box railway girder was fabricated and tested to identify its dynamic properties against a monolithic girder. The monolithic girder has the same geometric and material properties with respect to the spliced girder. Dynamic parameters including natural frequency, mode shape, and damping ratio were identified using the a digitally controlled exciter. Modal analyses were performed based on three-dimensional finite element models, and the calculated modal parameters were compared with test results. Finally, the characteristic decrease of natural frequency due to damage for each girder has been examined after the load test.