FEMA P-2091, A Practical Guide to Soil-Structure Interaction (FEMA P-2091)

FEMA P-2091 provides practical guidance for engineers on soil-structure interaction (SSI) in seismic design. The guide explains how soil flexibility affects seismic demands, such as period lengthening and foundation damping, and offers modeling techniques using vertical and horizontal springs. It discusses the influence of SSI on acceleration and displacement responses, and includes examples and key equations to support implementation in building design.