Dynamic Response of a Continuous-Deck Bridge with Different Skew Degrees to Near-Field Ground Motions

This paper tried to analyze the behavior of a typical bridge and the effect of its skew degree on its behavior to near-field earthquakes. to this end,the seismic behavior of a number of typical bridges with same spans and different skew degrees was studied under near-field and far-field earthquakes. non-linear static analyses (pushover analyses) were performed to determine the performance parameters of the bridge in each model. non-linear time history dynamic analyses were also performed on the models to analyze the dynamic behavior and deformations of bridge components under near-field and far-field earthquakes. the responses of models,such as their displacement,base shear,and axial forces of columns to earthquakes under study are presented in the following sections. results indicated that the base shear and displacement of the superstructure in near-field earthquakes without velocity pulse and far-field earthquakes are about or less than the corresponding values of the bridge performance point. moreover,in the case of near-field earthquakes with velocity pulses the values of these parameters showed an increase. it was also revealed that an increase in the skew degree of the bridge led to an increase in the axial forces in columns and transverse displacement of the bridge. © 2017,iran university of science and technology.