Seismic analysis of reinforced concrete building accounting for local uplift, large rotation of the base and soil plasticity

This study provides an analysis of multistory reinforced concrete residential buildings to earthquakes considering local uplift foundation, soil behaviour, site category and seismicity area as suggested by the Moroccan seismic regulation. The superstructure was modeled a flexible column with lumped mass placed at top under hypothesis large rotations or small rotations. governing equations coupled system were obtained expressing momentum conservation principle solved means adequate time integration numerical scheme. Then, maximum response determined El Centro ground motion for various configurations mat-foundation system: elastic elastic-perfectly plastic, well class magnitude. It found that nonlinear demand building, in terms values horizontal vertical displacements rotation, depends considerably on assumption regarding rotation is governed also height structure stiffness.