실물 CFT거더 모형 교량의 진동실험

초록

Concrete filled tube(CFT) which has various merits of good loading capacity, excellent deformable performance, reduced noise and vibration generation has conveniencies and economical aspects in design and construction for bridges. A real scale test on the model bridge with CFT girder was performed to evaluate applicability to railway bridges through checking on vibration efficiency. Major factors which give rise to vibration of railway bridge are crossing trains, working machines, earthquake, and wind. Check on the bridge vibration induced by crossing trains is very important to ensure riding performance of them. Dynamic capacity as well as bearing capacity and workability of CFT girder is necessary to guarantee applicability to railway bridges. In this study, a real scale bridge model was made in structural laboratory and various tests on dynamic characteristics(dynamic elastic modulus, damping ratio, natural frequencies, and mode shapes) was performed. In addition to this, simulation tests on crossing trains using dynamic actuators were performed and various responses(vertical displacements, accelerations, end-rotations of the model) were measured. From the result of this study, it is verified that the bridge with CFT girders may have sufficient dynamic performance for railway bridge.