2025 Volume 81 Issue 1 Article ID: 24-00039
Mountainous regions are a harsh environment for bridge construction, as little construction space is available. Since construction options are severely limited, a pier-type bridge structure consisting of compact members is sometimes adopted in such cases. The material of the piers is electric resistance welded pipes, and standard outside diameter is 500 mm, so slenderness ratio parameters may be large. Therefore, cyclic bending experiments under compressive axial force were conducted for grasping the ultimate strength and ductility of hollow electric resistance welded pipes with large slenderness ratio. The range of application in the plastic design method was determined by use of an elasto-plastic finite element analysis method that was verified by comparison with experimental results.
Based on the experimental and analysis results, the seismic performance of electric resistance welded pipes under compressive axial force and cyclic bending moment were examined and it is proposed to evaluate the ultimate strength and ductility of electric resistance welded pipes during earthquakes.
