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In this paper the influence of masonry infill modelling on the seismic response of reinforced concrete frames is investigated. First, various models are described and discussed, then a reinforced concrete frame, designed to be representative of an existing building in Italy, is analysed by means of numerical non linear static (pushover) analyses considering both the bare frame (as a reference model) and the infilled one. Different macro-models based on the equivalent strut approach are used with the aim of carrying out a comparison between them. The analyses are performed by means of the OpenSees software package. Beams and columns are modelled with elastic beam elements connected in series to zero-length nonlinear rotational springs located at member ends for representing plastic hinges. The infills are modelled with truss elements, to which a uniaxial material is assigned. The parameters, which characterize the uniaxial material, change with the infill model adopted. The results show that there is a noticeable difference of stiffness and strength estimated by means of different models.

Influence of Masonry Infill Modelling on the Seismic Response of Reinforced Concrete Frames