Seismic Performance Assessment of Bridges in Montreal Using Incremental Dynamic Analysis

The seismic performance of continuous 4-span bridges with different configurations has been evaluated using incremental dynamic analysis (IDA). The bridges were designed using the 2010 Canadian Highway Bridge code (CHBDC) and the bridges were evaluated using the design spectrum from the 2010 NBCC provisions. The IDA was performed using 39 pairs of ground motions. In addition the analyses were carried out using 2D and 3D models. The probability of exceeding different damage states were predicted at different hazard levels and fragility curves were developed for different damage states. The results demonstrate that the probabilities of exceeding different damage states are reasonably low for the corresponding seismic hazard in Montreal. The results also indicate that the use of 2D and 3D models for IDA may result in different assessments for the singlecolumn bent bridges studied and therefore care should be taken when treating the IDA results.