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Consideration of modelling uncertainties in the seismic assessment of masonry buildings by equivalent-frame approach

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Abstract

The choice of modelling strategy and analysis options has a significant influence on the results of the seismic assessment of existing buildings and therefore it is very important to have an idea of the dispersion in the results due to different hypotheses regarding the structural model. This paper concentrates on pushover analysis, considered as the reference method currently adopted by engineers for the seismic assessment of existing masonry buildings, and on the equivalent-frame macro-element approach, assumed to be a satisfactory compromise between computational effort and accuracy in the results. A logic tree approach is used to treat the different considered options, including the definition of the geometry of the equivalent frame, the distribution of loads among the masonry piers and on the horizontal diaphragms, the degree of coupling between orthogonal walls, the definition of the cracked stiffness of structural elements and the modelling of masonry spandrels. By assigning a value of probability to each end branch of the tree, the distribution of the peak ground acceleration corresponding to the selected limit states can be obtained and, from this distribution, a quantitative estimate (in probabilistic terms) of the effect of modelling uncertainties on the seismic response of masonry structures is derived.

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Acknowledgments

This work was carried out within the framework of the EUCENTRE Executive Project e1/2 “Seismic assessment of masonry buildings accounting for the knowledge level and the different sources of uncertainty” funded by the Italian Department of Civil Protection.

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Authors and Affiliations

  1. ROSE Programme, UME School, IUSS Pavia, Pavia, Italy

    S. Bracchi

  2. European Centre for Training and Research in Earthquake Engineering, Via Ferrata 1, Pavia, Italy

    M. Rota, A. Penna & G. Magenes

  3. Department of Civil Engineering and Architecture, University of Pavia, Via Ferrata 3, Pavia, Italy

    A. Penna & G. Magenes

Authors
  1. S. Bracchi
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  2. M. Rota
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  3. A. Penna
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  4. G. Magenes
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Correspondence to M. Rota.

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Bracchi, S., Rota, M., Penna, A. et al. Consideration of modelling uncertainties in the seismic assessment of masonry buildings by equivalent-frame approach. Bull Earthquake Eng 13, 3423–3448 (2015). https://doi.org/10.1007/s10518-015-9760-z

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  • DOI: https://doi.org/10.1007/s10518-015-9760-z

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