A Study on the Effect of Tie Elements: Properties on the Seismic Behavior of Confined Masonry Walls by Using Nonlinear Finite Element Analyses

Abstract eng:
In this study the nonlinear finite element analysis has been employed to find out how the properties of ties, either vertical or horizontal, affect the seismic behavior of confined masonry walls. For this purpose the DIANA software (Version 9.3), which is powerful tool for numerical modeling of such structures, has been used. Among the parameters, which are believed to be effective in the confined wall seismic behavior, four ones relate to the ties. These include compressive strength of concrete used in tie elements, cross sectional area of ties, the amount of longitudinal reinforcement in vertical ties, and finally the rigidity of connections between horizontal and vertical ties. With regard to the amounts of the four mentioned parameters, the values recommended by the National Iranian Code of Practice for Seismic Design of Buildings (Iranian Standard No. 2800) were used as the bench mark values. The type of analysis conducted for the wall numerical samples was Push-Over Analysis (POA) and in all cases some reasonable value was considered for the amount of surcharge imposing on the confined wall due to the dead load of the corresponding floor. The results of POA were obtained by assigning various values, from very low to very high, to the four mentioned parameters, and the lateral force – displacement curves were plotted for each set of values. Numerical results show that with variations of the four parameters, considered for the ties’ properties, between some limits the global behavior of wall changes slightly, however, if some of these four parameters get values beyond some limits the wall behavior changes drastically from one state to another.

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