Energy-Based Evaluation on Soil–Structure-Interaction-Related Damping of Inelastic Bridge Pier Structure Subjected to Pulse-like Velocity Ground Motion

This study proposed a procedure of using the energy method to evaluate SSI-related damping effect when soil–structure interaction (SSI) was considered in bridge pier system, which can thus be deemed soil–foundation–superstructure (SFS) inelastic system. Firstly, SSI is implemented by adopting discrete-time recursive filter approach as well frequency-dependent foundation–soil impedance functions solve for external soil forces exerted onto foundation. Then, integrating such into motion equations SSI-based SFS formulated during ground motions. To demonstrate procedure, an implementation involving carried out, considering two earthquake recordings. The resultant quantities and ratio shed light on how aspects characteristics affected dissipation mechanism renders promising solution quantifying role seismic arbitrary single- multiple-degree-of-freedom systems effect. results obtained show that suppressed system underwent near-fault earthquakes, illustrated stiffness contribution from not pronounced. Furthermore, earthquakes with large incremental velocities may lead low (SSIDR).