VERIFICATION OF DAMAGE FACTORS CAUSED BY THE 2024 NOTO PENINSULA EARTHQUAKE TO THE UPPER-DECK STEEL ARCH BRIDGE UTILIZING LIDAR TECHNOLOGY

Abstract

 The 2024 Noto Peninsula earthquake damaged several roadway structures. In the upper deck steel arch bridges that the authors surveyed for earthquake damage, buckling of the members near the crowns of the arch ribs was observed. Based on the results of the earthquake damage survey, the possibility of lateral movement of the A1 abutment was identified, and axial forces introduced into the arch ribs due to this movement were inferred to be the primary cause of the member buckling. Since the bridge was constructed in an old age and no drawings were available, an analytical model was created from the point cloud measured by LiDAR. The LiDAR used for the measurement was not accurate enough to measure the cross-section of the member, such as its thickness, and the cross-section was determined based on the results of the field measurements and the restored design. In this paper, we report the results of damage estimation for the analytical model considering various load actions and analytical investigation of damage factors of member buckling, and also the results of earthquake damage survey.