Engineering Mechanics Institute Conference 2013

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Assessment of a finite element modeling scheme for reinforced masonry shear walls

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Alireza Sayah
University of Texas, Arlington
United States

Andreas Stavridis
University of Texas, Arlington
United States

Abstract:
The finite element analysis of the nonlinear behavior of reinforced masonry structures under seismic excitations can be challenging and computationally demanding. It is therefore important to develop simulation tools that are computationally efficient; yet sufficiently accurate to simulate the complex behavior of such structures. This study evaluates a previously proposed finite element scheme that combines the smeared and discrete crack approaches to simulate the behavior of reinforced masonry shear walls under in-plane lateral loads.
To validate the model, the data obtained from tests of two specimens , with distinct failure patterns is used. The material parameters of the model have been calibrated with data from material tests and data available in the literature. The comparison of the results obtained from the finite element analyses and the experimental data indicates that the model is able to capture the load-vs.-displacement response and the different failure mechanisms including crushing of the masonry, and the development of dominant shear and diffused flexural cracks, as shown in Figure 1. The validated models have been used in a parametric study conducted to investigate the influence of all the material parameters needed for the calibration of the models on the structural performance of the walls. The criteria used to quantify the influence of each parameter are the initial stiffness, the peak strength and the corresponding drift ratio, and the drift ratio at which the strength drops to 90% of the peak strength. The results of this parametric study and their implications on the calibration procedure will be discussed in detail in the paper.

 

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