The use of macro-modeling approaches based on the concept of the equivalent strut for simulating infill panels presents a number of critical aspects, mainly related to the vari-ability of the results from the parameters adopted (for example: width of the strut, non-linear constitutive law under cyclic actions, assignment of strut mechanical properties in multiple strut models). It should also be observed that it is particularly difficult to identify and cali-brate the above mentioned quantities, even if the mechanical parameters of the masonry com-ponents (mortar and bricks) are known. It is thence highly desirable to define numerical procedures for aimed at this task, in order to reduce the variability of results due to the char-acteristics of the equivalent strut. In the present paper, the first results of a procedure aimed at the calibration of the macro-models of infill panels are presented. The adopted methodol-ogy directly considers the heterogeneity of materials and the texture effects at the micro-scale, exploiting a "Rigid Body and Spring Model"(RSBM), in which the masonry panel is described as a set of unitary cells constituted by rigid blocks and elasto-plastic springs. The non-linear cyclic law of the equivalent strut is then obtained by a simple numerical identification proce-dure. The approach has been validated on the basis of some reference experimental tests available in the technical literature, by comparing the experimental results and those ob-tained respectively by RBSM model and the strut model previously calibrated with the pro-posed procedure.

An analytical approach for assessment of effects on infill panels in RC frames

CASOLO, SIRO;
2013

Abstract

The use of macro-modeling approaches based on the concept of the equivalent strut for simulating infill panels presents a number of critical aspects, mainly related to the vari-ability of the results from the parameters adopted (for example: width of the strut, non-linear constitutive law under cyclic actions, assignment of strut mechanical properties in multiple strut models). It should also be observed that it is particularly difficult to identify and cali-brate the above mentioned quantities, even if the mechanical parameters of the masonry com-ponents (mortar and bricks) are known. It is thence highly desirable to define numerical procedures for aimed at this task, in order to reduce the variability of results due to the char-acteristics of the equivalent strut. In the present paper, the first results of a procedure aimed at the calibration of the macro-models of infill panels are presented. The adopted methodol-ogy directly considers the heterogeneity of materials and the texture effects at the micro-scale, exploiting a "Rigid Body and Spring Model"(RSBM), in which the masonry panel is described as a set of unitary cells constituted by rigid blocks and elasto-plastic springs. The non-linear cyclic law of the equivalent strut is then obtained by a simple numerical identification proce-dure. The approach has been validated on the basis of some reference experimental tests available in the technical literature, by comparing the experimental results and those ob-tained respectively by RBSM model and the strut model previously calibrated with the pro-posed procedure.
Computational Methods in Structural Dynamics and Earthquake Engineering
Existing Building; Seismic Assessment; Reinforced Concrete; Infilled Frame; Equivalent Strut; Meso-scale; RBSM model
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/733767
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