The behavior of masonry assemblages and masonry-infilled R/C frames subjected to combined vertical and cyclic horizontal seismic-type loading

Experimental Measurements and Numerical Non-Linear Simulation of the in-Plane Behaviour of R/C Frames With Masonry Infills Under Cyclic Earthquake-Type Loading

“…The features of this numerical simulation are presented in figure 6a and in more detail in figures 7 and 8. These features are the same as the ones proposed by Manos, Soulis & Thauampteh before ( [2], [3]) with the addition of the possibility of shear limit state at predetermined locations along the height of the R/C columns of the single storey R/C frame. In figure 6a, these non-linear mechanisms are denoted as: (1) corresponding to the non-linear behaviour of the masonry infill itself adopting a macro-model in this case, (2) the infill-beam interaction at the contact region, (3) the infill-column interaction at the contact region (4) the formation of a plastic hinge at the end of a beam, (5) the formation of a plastic hinge at the top or bottom of a column and finally (6) the formation of a shear limit state along the height of a column.…”

“…The mechanical properties of the reinforcement, masonry units and mortar joints are shown in tables 2, 3, 5, 6, 7. Normative tests have been realized by Penava et al [16] in a way similar to the one employed by Manos et al [3] did to obtain the material properties. This was very useful in defining the mechanical properties assumed in these numerical simulations [3], [15].…”

“…An extensive study on various numerical simulations of the behaviour observed for masonry infilled R/C one-bay one-storey frame specimens tested by Stylianides [7], Valiasis [8], Yasin [9], and by Thauampteh [11] was included in [10] together with an extensive validation process, utilizing the results of numerous experimental studies ( [3], [7], [8], [9], [11]). Two different modelling strategies are applied here for the numerical simulation of the masonry infill, namely, a macro-modelling and a micro-modelling strategy.…”

“…Each one of the numerical simulations of the specific non-linear mechanisms (1) to (5) has been validated separately by Soulis [10] and Manos ([2], [3]) utilising relevant laboratory measurements obtained by Thauampteh [11]. The additional shear limit state non-linear mechanism, represented by detail (6) in figure 6a, is numerically approximated again by a combination of rigid zones and non-linear joint elements with properties based again on the geometric data of the column cross section, the material properties of the constituent materials (concrete, transverse steel), and the relevant structural detailing.…”

“…This is the case till the masonry infill fails, being usually relatively weak ( [1]). An extensive experimental and numerical study ([2], [3], [4], [5], [6], [9], [10], [11]) was carried out at the laboratory of Strength of Materials and Structures, Aristotle University, in an effort to examine the in-plane seismic behaviour of infilled R/C frames. It was shown that the stiffness and strength of the examined masonry infilled, single-story R/C frames was significantly influenced by the following non-linear mechanisms: a) The non-linear flexural behaviour of the R/C frame (plastic hinges).…”