The three-dimensional (3D) beam-truss model (BTM) for reinforced concrete (RC) walls, which was developed by the first two authors in a previously published paper, is modified to better represent flexure-shear interaction and more accurately compute diagonal shear failures under static cyclic or dynamic loading. The modifications pertain to the element formulations and the determination of the inclination angle of the diagonal elements. Moreover the BTM is extended to allow the simulation of RC slabs. The modified BTM is validated using the experimental test data of eight RC walls subjected to static cyclic loading, including two non-planar RC walls under multi-axial cyclic loading, a slab specimen, and a 5-story non-planar RC coupled wall-slab specimen under triaxial dynamic base excitation. Six of the walls considered experienced diagonal shear failure after reaching their flexural strength, while the other two walls had a flexural dominated response. The numerically computed lateral force-lateral displacement and strain contours are compared to the experimental recorded response and damage state for each of the walls. The effects of different model parameters on the computed results are examined by means of parameteric analyses.
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