Accounting for Inelastic Response of URM Buildings in Acceleration Demands on Face-Loaded Walls

Abstract eng:
Response of unreinforced masonry (URM) to out-of-plane excitation is a complex, yet inadequately addressed theme in seismic analysis. Seismic input expected on a face-loaded wall in an URM building is the ground excitation filtered by the in-plane response of the walls and the floor diaphragm response. The dynamic response, i.e., the superposition of vibration modes of the primary lateral load-resisting structure, and the non-linear structural response contribute to the filtering phenomenon. The current paper summarises an investigation aimed at developing a semi-analytical formulation to estimate the acceleration demand on a face-loaded URM wall or a generic secondary system, that explicitly takes into account the level of inelastic demand on the primary structure, in terms of the displacement ductility demand. The proposed formulation is based on statistical evaluation of several non-linear dynamic time-history analysis results treated within a parametric framework.

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