A Novel Framework to Include P-Δ Effects in Displacement-Based Seismic Assessment

During an earthquake, P-Delta effects could significantly increase the horizontal displacements in a structure; hence, they should be duly accounted for in seismic assessment procedures. Considering the displacement based assessment (DBA) procedure, P-Delta effects influence the single degree of freedom substitute structure adopted in the procedure both in terms of shear-displacement relationship and of equivalent viscous damping. The present article considers a novel framework to include P-Delta effects in the DBA procedure. The application of the proposed procedure is illustrated considering the Takeda hysteresis model commonly adopted for reinforced concrete structures.