Case Study on the Geotechnical Seismic Design for Lateral Flow Effects on a Single Span Bridge in Pumiceous Deposits

This paper presents a practical application of pseudo-static analysis methods to assess the impact of liquefaction and lateral spreading effects on a single spanned bridge and its foundation. The case study presented includes the assessment of seismic ground response using shear wave velocity testing to inform the kinematic loading of pile foundations. Some limitations encountered with the current guidance are discussed, specifically when flow failure is expected during or immediately following intense earthquake shaking. Insights into the assessment and modelling processes are also presented, including the different soil-structure loading scenarios for the whole bridge analysis and the incorporation of uncertainty in the assessment procedures.