21 - Incremental dynamic analysis (IDA) applied to seismic risk assessment of bridges

Abstract

This chapter focuses on the use of incremental dynamic analysis (IDA) for seismic performance and risk assessment of reinforced concrete bridges. Different record selection methods, including the epsilon-based, conditional mean spectrum (CMS)-based and uniform hazard spectrum (UHS)-based methods, are used for the prediction of the structural responses using IDA. In addition, the influences of including different earthquake types (i.e., crustal, subduction interface and inslab earthquakes) on the IDA results are studied. Guidelines for determining different damage states in bridge columns and developing fragility curves are provided. The important aspects of structural modelling of bridges for IDA are presented and the use of IDA for the seismic risk assessment of a 4-span bridge is demonstrated through an example.