All the modern seismic codes are based on the Performance-Based Assessment (PBA). PBA generally uses pushover analyses and the verification by the non linear static procedures. Usually pushover analyses are performed assuming a fixed-base structure. However for heavy and rigid masonry structures, compliance and geometry of the foundation system, in combination with the non-linear behaviour of the foundation soil, may significantly modify the actual response in terms of both capacity and demand. Regarding the capacity, taking into account soil compliance modifies the pushover curve, leading to more flexible systems. Regarding seismic demand, spectra including soil-foundation-structure interaction differ from those traditionally obtained in case of free-field ground motion. In this paper, firstly, specific impedance functions for flexible masonry foundations are proposed and then parametric non linear analyses on 3D-complex masonry buildings (by using the Tremuri Program) are performed in order to gain insight into the influence of the foundation-soil system compliance on PBA.

Effects of soil-structure interaction on performance-based assessment of masonry buildings

CATTARI, SERENA
2012-01-01

Abstract

All the modern seismic codes are based on the Performance-Based Assessment (PBA). PBA generally uses pushover analyses and the verification by the non linear static procedures. Usually pushover analyses are performed assuming a fixed-base structure. However for heavy and rigid masonry structures, compliance and geometry of the foundation system, in combination with the non-linear behaviour of the foundation soil, may significantly modify the actual response in terms of both capacity and demand. Regarding the capacity, taking into account soil compliance modifies the pushover curve, leading to more flexible systems. Regarding seismic demand, spectra including soil-foundation-structure interaction differ from those traditionally obtained in case of free-field ground motion. In this paper, firstly, specific impedance functions for flexible masonry foundations are proposed and then parametric non linear analyses on 3D-complex masonry buildings (by using the Tremuri Program) are performed in order to gain insight into the influence of the foundation-soil system compliance on PBA.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/773915
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