Abstract
Masonry itself is a composite heterogeneous material whose structural behaviour is strongly affected by many influencing parameters with a wide range of possible values, construction procedures as well as care methods taken afterwards. When the masonry panel is added into the surrounding frame the complex interactive frame-infill system is established exhibiting highly nonlinear inelastic structural behaviour. Therefore, the analytical modelling of masonry-infilled frame structures is a very complex task that demands various data matching given in-situ conditions, otherwise applied methods and analytical models used have only a theoretical value. In this paper analytical modelling of infilled steel frame structures is based on previously experimentally calibrated data. The base for calibration of analytical models was experimental testing of one-bay, one-storey infilled steel frames conducted at the Faculty of Civil Engineering, Josip Juraj Strossmayer University of Osijek. Two series by three steel frames were infilled with perforated clay blocks (‘strong infill’) and autoclaved aerated concrete blocks (‘weak infill’) respectively. The significant difference in structural behaviour of these two kinds of masonry infill is observed and modelled. The macro-models (single-strut and three-strut model and infill-panel macro-model) and detailed 2D micro-models were applied. A total of eight analytical models were analysed with their relevant characteristics along with the quality of epresentation of the measured global and local results as well as their applicability.
Highlights
It is a well-known fact that masonry infill in frame structures significantly affects its strength, stiffness and ductility causing changes in typical frame behaviour
The fact often pointed out is that neglecting of masonry infill's influence on global and local frame behaviour can seriously affect the reliability of a structure
As the lateral load acts at the frame joints, it is transferred by a) c) Figure 7 Multiple strut model (MSM), (a) Model layout, (b) Simplified tri-linear stress-strain relationship for masonry infill, (c) typical forcedeformation relationship for the struts
Summary
It is a well-known fact that masonry infill in frame structures significantly affects its strength, stiffness and ductility causing changes in typical frame behaviour. These changes can be favourable or detrimental, depending on many influencing factors Structural engineers sometimes tend to ignore contribution of infill panels due to lack of practical design methods, as well as detailed rules for designing of such kind of structures in contemporary codes (such as EC8, [2]) It is understandable a great effort made by various researches to establish simple, but accurate enough approach, of analytical description. Typical macro and micro models have been created and calibrated using the results of the experimental testing
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