Non-linear behavior of unreinforced masonry walls with different iranian traditional brick-work settings

Abstract eng:
Thousands of brick-made historical buildings in Iran are counted as the important legacy of Iran. The need to preserve and protect these historical structures has seen the emergence of researches directed toward the analytical modeling of fracture in masonry. The fracturing mechanism in masonry is a complex phenomenon due to two brittle materials with distinct material properties. The mechanical behavior of brickwork is strongly affected by the behavior of mortar joints. Mortar joints are the planes of weakness of masonry, especially in old buildings due to the weathering and agedness. Therefore, the orientation of mortar joints affects the fracture pattern of brickwork and causes different types of crack pattern in brickwork settings. Accordingly, the analysis of historical buildings, aimed at structure assessment and restoration, demands an adequate understanding of the mechanical behavior of these different types of brickwork setting and accurate data consist of elastic and inelastic parameters. This paper presents the results of numerical modeling of common types of brickwork behavior, existed in Iran ’s brick-built monuments. Since the possibility of derivation an accurate yield criterion for continuum model substituting the masonry is usually difficult, and using those criteria is probably costly and time consuming, there is a higher willingness of using simple plasticity material model for practical problems. For better comparison of these different types of brickwork setting, the results concerning in-plain testing of panels subjected to compressive and shear loading, are presented as a relation between average normal stress and maximum average shear stress. The computations of simplified micro-modeling simulated tests of brickwork panels are performed using 3DE C program based on Distinct Element method (DEM. In the DEM modeling Mohr-Coulomb failure surface with a tension cut-off is chosen as a constitutive law for both blocks and joints with zero thickness (representing mortar bonds). Using these elastic-plastic parameters for different parts, the behaviors of different brick-work setting constructions subjected to the semi-static loads, are evaluated.

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