Numerical Modeling of Masonry-infilled RC Frame
Christiana A. Filippou, Nicholas C. Kyriakides*, Christis Z. Chrysostomou, Elpida S. Georgiou
The behavior of masonry-infilled reinforced concrete (RC) frame structures during an earthquake, has attracted the attention of structural engineers since the 1950’s. Experimental and analytical studies have been carried out to investigate the performance of masonry-infilled RC frames under in-plane lateral loadings.
This paper presents a numerical study of the behavior of an existing masonry-infilled RC frame that was studied experimentally at the University of Patra. The objective of the present study is to identify suitable numerical constitutive models of each component of the structural system in order to create a numerical tool to model the masonry infilled RC frames in-plane behavior by accounting the frame-infill separation.
A 2D masonry-infilled RC frame was developed in DIANA Finite Element Analysis (FEA) software and an eigenvalue and nonlinear structural cyclic analysis were performed. It is a 2:3 scale three-story structure with non-seismic design and detailing, subjected to in-plane cyclic loading through displacement control analysis.
There was a good agreement between the numerical model and experimental results through a nonlinear cyclic analysis. It was found that the numerical model has the capability to predict the initial stiffness, the ultimate stiffness, the maximum shear-force capacity, cracking patterns and the possible failure mode of masonry-infilled RC frame.
Therefore, this model is a reliable model of the behavior of masonry-infilled RC frame under cyclic loading including the frame-infill separation (gap opening).
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