Seismic Performance of Integral Abutment Bridges Designed According to Second-Generation Eurocode 8–2

This study investigates how abutment type, foundation configuration, and pier design affect the nonlinear seismic performance of integral abutment bridges designed according to the second-generation Eurocode 8–2. Fully-integral and asymmetric semi-integral bridge configurations with one integral abutment and one seat-type abutment are analysed using nonlinear static and dynamic analyses at significant damage and near-collapse intensity levels. Results show that fully-integral bridges benefit from effective passive soil mobilisation and can be reliably designed using simplified force-based approaches. In contrast, asymmetric semi-integral bridges exhibit more complex behaviour, with increased displacement demand and residual deformations. These findings are specific to the investigated configurations.