A Study of the Effect of Infilled Brick Walls on the Behavior of Eccentrically Braced Frames

Abstract eng:
Eccentrically Braced Frames (EBFs) are usually infilled by masonry walls, but in common design, the stiffness and lateral resistance of these walls is ignored. In this study, a proper model is developed using explicit finite elements method to study the behavior of EBFs with infilled masonry wall. Because of complicated mechanical and geometrical properties of masonry walls and also because of the interaction between steel frame and masonry wall, this model is not easy to obtain. To ensure the ability of the model to precisely simulate the behavior of an EBF with infilled brick wall, initial models were made and the problems were solved comparing the results of experimental test and the results of these initial models. Material models and some basic principles of explicit finite element algorithm are used and three initial models were made: a model of a brick wall without EBF, a model of an EBF without infilled brick wall and finally a model of an EBF with infilled brick wall. Using these three initial models, constitutive model for masonry and steel material, and also the proper elements for modeling the behavior of mortar are obtained. Then the final model of an EBF with infilled brick wall is made and the influence of brick wall on the behavior of total frame is studied. In addition, shear strength and cracking pattern of masonry wall under static loading is studied.

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