Abstract
The performance of a typical four span continuous reinforced concrete bridge subjected to uniform and multiple seismic excitations at the supports is investigated in both the time and frequency domains. In the time domain analysis, a linear modal superposition approach is used to compute the peak response values. In the frequency domain analysis, a stochastically based linear random vibration theory is used to determine the root mean square response values where the cross correlation effects from the modal and the support excitations on the seismic response of the bridge model are included. The spatial variability of seismic ground motion may have a significant effect on the dynamic response of bridges. This study shows that the frequency domain analysis is preferred for the design purpose because of the computational advantage and the generality of the results. A practical range of peak factors that may be used with the stochastic analysis for computing the peak responses for typical continuous reinforced concrete bridges is provided.
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