1st Croatian Conference on Earthquake Engineering 1CroCEE 2021

The seismic performance of a structure is determined by a series of factors that are related with the earthquake source characteristics, site effects and structural capacity, among others. The state of the art of seismic vulnerability assessment methods, using probabilistic approach, are capable of incorporate the effect of some of these factors. Within the epistemic uncertainties, the soil effects have an important contribution as soil profile characteristics have a major influence on spectral amplification results. This is more evident in case of the softer soil types. Eurocode 8 specifications for seismic design of structures founded on very soft (stratified) soils, classified as S1, requires special studies to define the seismic action. In this work the seismic performance of a 9 story (7 stories and 2 underground stories) RC structure, founded on an S1 type soil, located in Lisbon, Portugal is evaluate by means of nonlinear static results (N2 method). Global performance is evaluated and damage limitation control, in terms of interstorey drifts according to Eurocode 8, is verified in the central members for the different soil profiles.