This study carries out a parametrical analysis of the seismic response to asynchronous earthquake ground motion of a long\r\nmultispan rc bridge, the Fener bridge, located on a high seismicity area in the north-east of Italy. A parametrical analysis has\r\nbeen performed investigating the influence of the seismic input correlation level on the structural response: a series of nonlinear\r\ntime history analyses have been executed, in which the variation of the frequency content in the accelerograms at the pier bases has\r\nbeen described by considering the power spectral density function (PSD) and the coherency function (CF). In order to include the\r\neffects due to the main nonlinear behaviours of the bridge components, a 3D finite element model has been developed, in which\r\nthe pounding of decks at cap-beams, the friction of beams at bearings, and the hysteretic behaviour of piers have been accounted\r\nfor. The sensitivity analysis has shown that the asynchronism of ground motion greatly influences pounding forces and deck-pier\r\ndifferential displacements, and these effects have to be accurately taken into account for the design and the vulnerability assessment\r\nof long multispan simply supported bridges.
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