2023 Volume 79 Issue 13 Article ID: 22-13026
In the Kumamoto earthquake in April 2016, the heavy damage of truss bridges caused by ground deformation was not reported, although many other types of bridges were seriously damaged due to ground change. However, as a result of continuous analysis of the case that the ground slides near the abutment, it has been found that a small amount of ground deformation can cause severe damage to lower member of truss bridge.
Thus in this study, we carried out elasto-plastic static analyses and seismic response analyses for Warren truss bridge at the time of ground deformation. At First, forced displacements in the compressive direction were applied to the lower members, and the damage and deformation of the truss bridge were investigated by elasto-plastic static analyses. Thereafter the seismic response analyses were carried out on the model with forced displacement as an initial imperfection, and it was confirmed how vulnerable Warren truss bridge was to seismic motion due to initial imperfection.
