| For underground structures such as box culverts, no comprehensive seismic design method has been presented so far. This is because most of the earthquake damage that occurs to underground structures is concentrated on the joints in the axial direction of the structure, and other damage is rarely seen. However, as is known from the damage to Daikai Station caused by the Hyogoken-Nanbu Earthquake, damage in the direction perpendicular to the axis cannot be guaranteed, and it is necessary to anticipate damage and prepare for it.
On the other hand, utilization of precast members can be considered as one of the methods for improving the productivity of concrete structures. Box culverts are one of the uses of precast members, and large ones often require joints within the cross section.
Joints of rebar can be structurally weak points, so joints are often not concentrated on the same cross section, but from the viewpoint of construction efficiency, it is desirable to set joint positions on the same cross section. Since this requirement is particularly strong in precast box culverts, a seismic design method for precast structures with joints is required.
In this paper, when a large-scale precast box culvert installed underground is subjected to a large-scale earthquake and adopts a design method that allows partial damage, even if precast members with joints are damaged, in order to confirm that the function of the structure can be maintained, we report the results of a loading test using a full-scale partial model. |
