Abstract
Masonry elements are often strengthened in order to improve their structural capacity. Generalized methods to assess the behavior of confined masonry columns are not available in the technical literature. They have been usually derived from concrete confinement models. However, concrete and masonry present several crucial differences due to their physical and mechanical properties. In fact, generalized models to assess the axial capacity of masonry columns were limited by the strong variability and heterogeneity of physical and mechanical properties. However, the recent scientific researches provided relevant information on the experimental behavior of confined masonry columns. In this paper, a confinement model has been proposed to assess the axial capacity of clay brick masonry strengthened using several strengthening systems. The model has been validated by means of comparisons with experimental results. In order to assess the potential of the proposed model, the comparison was carried out also with other available mechanical models.
Highlights
M odern strengthening strategies can be performed to improve the structural capacity of several types of structures [1, 2]
The present paper focuses on confinement models based on a mechanical approach
On the entire experimental sample the model provides a weak estimation of the axial capacity of masonry columns wrapped with composites
Summary
M odern strengthening strategies can be performed to improve the structural capacity of several types of structures [1, 2]. For this reason a model for all types of masonries is extremely difficult to develop In this background, the confinement models based on failure criteria appear to be the best approaches to assess the axial capacity of strengthened masonry columns. The mechanical model based on failure criterion allows to assess the confinement curve under a non-uniform stress state 1 2 typically developed in nonaxisymmetric confined elements. For these elements, two main lateral stresses can be identified 1 fl ,min and. The equation of the failure surface (1) fD P according to Drucker-Prager model can be written in normalized form, f D P , as follows: f
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