The Akashi Kaikyo bridge,the world's longest suspension bridge,was under construction when the Kobe earthquake occurred on January 17,1995.Seismic performances of TMDs attached to the towers of the bridge are examined in this paper.In the first step the fault rupture process of the earthquake is refined by means of co-seismic displacemnet analysis and seismogram synthesis.It is found that a third fault,as the result of the reptures of two main faults,was deveped beneath the bridge.The input ground motions at the foundations of the bridge are synthesized for the refined rupture model.The results of structural analysis show that the TMDs had almost no effect in reducing seismic responses.Even if the masses of the TMDs are made much larger than the original ones,their performances are not significant in reducing responses due to hte near-field earthquake.
展开▼
