Seat width requirement for skewed bridges under seismic loads

In this paper, the dynamic characteristics of skewed bridges are exploredanalytically. closed form solutions for translational and torsional periods of free vibrationand mode shapes are given for slab-girder skewed bridges. moreover, the seismicdisplacement of the deck of skewed bridges is calculated using the response spectrummethod and its skew term is compared with the requirement of aashto. the eectsof seismic force resisting elements, such as elastomeric bearings and end diaphragms areincluded. it is shown that the skew term in aashto's equation can underestimate theseat width requirement for some bridges. a new skew term for the bridge seat widthrequirement is suggested.