2025 Volume 81 Issue 13 Article ID: 24-13541
In 2020, CHIDA et al. conducted FEM analyses to simulate the situation that forced displacement due to ground deformation acted arch ribs of upper-deck type arch bridge, and yielding occurred at the arch crown by 10 or more cm forced displacement for bridge axis direction. Four years later, during the Noto Peninsula Earthquake of 2024, the abutment of upper-deck type steel arch bridge slid in the direction of the side span and buckled at the arch crown. This study confirmed the high accuracy of the FEM analysis that simulated the behavior caused by ground deformation and the vulnerability of bridges composed of bearing members to ground deformation. In this study, the relationship between the number of span and damage behavior was compared by simulating the forced displacement of the lower chords due to ground movement in 4 to 8spans warren truss bridge which consists of bearing members in the same way as arch bridge, and to formulate the amount of forced displacement that can cause damage to the bottom chord material.
