Seismic Demands for Performance-Based Design of Bridges

[Veggeta]

Seismic Demands for Performance-Based Design of Bridges

The objective of this report was the development of an optimal PSDM for typical highway overpass bridges. An optimal model is defined as one that is practical, sufficient, effective, and efficient. For single-bent bridges with roller abutments, the optimal model
comprises a spectral IM, such as Sa(T1) and one of several EDPs. Different EDPs are considered for local (material stress), intermediate (column moment), and global (drift ratio) response quantities. Given the optimal PSDMs, bridge design parameter (such as column diameter) sensitivity studies were performed. Relations for each design parameter can be developed, giving bridge designers a quantitative tool for evaluating the effect of design choices on structural performance. The same PSDMs were then re-computed using incremental dynamic analysis (IDA) to assess the equivalency of response produced using the two analysis methods. Selection of an optimal PSDM was then extended to the case of multiple-bent bridges and bridges with different abutment models

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[kowheng]

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