ABSTRACT
ABSTRACT: This paper explains a new viaduct structure that improves the environment of under-viaduct space. We thought out a new structure for a low-vibration viaduct to reduce the vibration transmitted from beams to columns by inserting elastic material to the joints of beams and columns. With this socket joint structure with sufficient socket joint depth, it is possible to give columns the load carrying capacity equivalent to columns of traditional structures. We checked the low-vibration effect by analyzing trains running in the viaduct with socket joints and confirmed that the vibration acceleration level in the 30-60 Hz band can be reduced by approximate 20-25 dB compared to traditional structures. In order to check a seismic performance, we carried out reversal cyclic loading tests, and analyzed seismic response. This research proved that our new structure has the effect of reducing damage of columns, while seismic deformation of upper points is larger than traditional structures.
