This paper deals with the modeling of existing unreinforced concrete block walls with finite elements and evaluation of a proposed retrofit solutions used in practice. The objectives of developing the analytical model were prediction of inelastic response of the walls with the openings and the study of the effect of the retrofit solution for seismic upgrading of the existing walls. Concrete core technique was employed for wall retrofit of the different models. To study of in-plane behavior of the walls the models were verified with the test results obtained from the similar walls studied in previous works and calibrated to present the identical inelastic loaddeformation response of the tested specimens. Nonlinear push over analysis was performed on the models to study the capacity of the walls up to 4% drifts. As results, the inelastic response was compared in different studied walls. Lateral resistance capacity, initial stiffness and the mode of failure of the walls were presented and the effect of the retrofit solution on the behavior of the existing masonry walls with large openings was
evaluated.
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