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. Most of existing experimental investigations of bridges were under slow cyclic loading. Data about the dynamic response of bridge components are relatively rare. The experiments investigating the response of the whole bridge are only few. One of these very rare (dynamic) tests of the whole bridges was recently performed at the University of Nevada, Reno. Large scale model (scale 1:4) of an asymmetric, four-span, torsionally sensitive bridge was bi-axially tested on three shake tables. Additionally, the influence of the abutments to the seismic response of the whole bridge was also investigated, exciting the bridge in the longitudinal direction simultaneously with actuators attached to the abutment seats. The response of the bridge was very complex, exhibiting large in-plane deck (torsional) rotations.

NUMERICAL MODELLING OF A FOUR-SPAN BRIDGE, BI-AXIALLY TESTED ON THREE SHAKE TABLES