207. finite element modeling of the nonlinear seismic response of reinforced masonry structures
Name: Andreas Koutras
Grad Year: 2018
Reinforced masonry building systems are commonly used in North America, even in areas of high seismicity. However, assessing their seismic performance is a challenging task due to the complicated behavior they could exhibit when subjected to earthquake forces. In this study, a three-dimensional finite element modeling scheme has been developed for the simulation of the inelastic response of reinforced masonry structures under cyclic static and dynamic loading. Smeared-crack shell elements are combined with cohesive crack interface elements to capture the crushing and tensile fracture of masonry. The reinforcing bars are modeled with geometrically nonlinear beam elements to capture bar buckling and are connected to the masonry elements through interface elements that account for the bond slip and dowel action effects. An element removal procedure that is triggered by the rupture of a reinforcing bar or the severe crushing of the masonry has been adopted. The material models and the interface elements are implemented in commercial finite element analysis software as user-defined features. The modeling scheme is validated with data from quasi-static cyclic tests on single reinforced masonry shear walls, as well as results from shake-table tests of reinforced masonry building systems subjected to real earthquake ground motions. Fully grouted and partially grouted masonry buildings are considered. The numerical results indicate that the proposed finite element modeling scheme can be used to capture the seismic behavior of reinforced masonry structures in a realistic manner.
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