Abstract
Seismic performance of a 160m long reinforced concrete arch bridge is clarified based on a series of nonlinear dynamic response analyses. Since an arch rib is subjected to large flexural moment as well as axial force in an extreme earthquake, the effect of axial force N vs. flexural moment M interaction should be included in the analysis. It is found from the analyses that the maximum bending moment was 36% overestimated while the maximum curvature was 30% underestimated at a springing by taking the N-M interaction into account. It is also found that brittle failure is likely to occur in the arch rib resulting from high axial force.
