Application of Sway-Rocking Model to Retrofit Design of Bridges

Abstract eng:
To evaluate the earthquake resistance of existing bridges, authors have developed the inverse analysis method to obtain elastic constants and damping coefficients of piers with pile foundations. The problem of applying the inverse analysis method to the Sway Rocking model is the examination of the incident seismic wave. As the means, two cases in which the ground is not liquefied and it liquefies are done by dynamic centrifuge tests under the level 2 earthquake motion. As the result, the response of the pier on the not liquefied ground is simulated reasonably when the response acceleration motion on the surface ground is applied as the incident seismic wave. On the other hand, the response on the liquefied ground is simulated when the incident seismic wave is not the surface ground motion but the motion observed at the boundary of liquefiable and not liquefiable layers. The Sway Rocking model is simple but the dynamic analysis of the model give reasonable solutions when the appropriate motion is given as the incident seismic wave.

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