Fragility Estimation and Comparison Using IDA and Simplified Macro-Modeling of In-Plane Shear in Old Masonry Walls

Morais, Eduardo and Vigh, László Gergely and Krähling, János (2016) Fragility Estimation and Comparison Using IDA and Simplified Macro-Modeling of In-Plane Shear in Old Masonry Walls. In: Dynamical Systems: Modelling. Springer Proceedings in Mathematics & Statistics (181). Springer International Publishing, Switzerland, pp. 277-291. ISBN 978-3-319-42401-9

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Abstract

The estimation of fragility functions associated with dynamic structural analysis provides the probability of a certain damage state given an intensity measure. The presented paper discusses this technique regarding its application to a method to estimate the magnitude of historical seismic events relying on the behavior and damage in real historical structures. A bin of 50 seismic records is selected matching the Komárom hazard spectrum and applied with Incremental Dynamic Analysis to generate the damage state points of a 2D one-story frame numerical model developed using Opensees code and calibrated to simulate the in-plane shear behavior of historical old clay and adobe masonry infilled walls. A scaling technique is applied and a damage type identification strategy adapted to the material model are developed to perform Incremental Dynamic Analysis and efficient fragility function fitting in MATLAB. Results highlight considerable uncertainties regarding the calibration of the numerical model, material and geometric nonlinearities and seismic record selection in this procedure. Despite efficiency, the methodology application and overview suggest that a full probabilistic approach fragility function fitting using the background of seismic hazard analysis and reliability theory, providing a concomitant sensitivity analysis, is important to proceed with variables weight evaluation and account for uncertainties.

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