抄録
A simplified model of 3-degree-of-freedom system composed of single mass element and sway-rocking element is studied to evaluate earthquake-resisting capacity of existing bridges. Elastic constants and damping coefficients of soil-structure interaction are calculated from observed earthquake motions at the top of pier and on the close ground by structural identification techniques based on inverse analysis. The identified parameters are compared with these values simulated according to the specifications for highway bridges. As results, the parameters according to the specifications for highway bridges would not always lead secure solutions under the condition of the inelastic response analyses of the 3-degree-of-freedom system in level2 earthquake motions.
