MODELING FLEXURE-SHEAR FAILURES IN MASONRY-INFILLED RC FRAMES WITH INELASTIC FIBER-BASED FRAME ELEMENTS

Abstract eng:
A numerical procedure for modeling beam and/or column shear failures in RC infilled frames is presented. The main novelty relies in the use of inelastic fiber-based frame elements with flexure-shear interaction for modeling the RC members. The frame element is based on the Timoshenko beam kinematic assumption combined with an orthotropic smearedcrack constitutive model for cracked concrete, which is defined at each section fiber for the determination of the nonlinear sectional response. For the masonry panel, the equivalent multiple-strut approach is adopted, in order to accurately predict the distribution of shear and bending moments in the RC members due to infill-frame interaction. The procedure is verified against available monotonic tests where flexure-shear failures of the RC members were observed during the test. Comparison with traditional flexural frame elements is also provided in order to highlight the differences between the two methodologies.

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