IP-OOP interaction in URM infilled frame structures: A new macro-modelling proposal

•Earthquakes cause on infills In-Plane (IP) and Out-Of-Plane (OOP) actions.•IP-OOP interaction may cause an anticipation of the OOP collapse.•The formulation of simplified models is a goal to be definitely reached.•A macro-model for infill IP-OOP response interaction is presented. Reinforced concret...

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Bibliographic Details
Published in:Engineering structures 2020-12, Vol.224, p.111211, Article 111211
Main Authors: Pradhan, Bharat, Cavaleri, Liborio
Format: Article
Language:English
Subjects:
Beam-columns
Compressive properties
Compressive strength
Empirical equations
Frame structures
In-plane (IP) and out of plane (OOP) interaction
Infilled frames
Macro model
Masonry
Mathematical models
Mechanical properties
Parameters
Reinforced concrete
Seismic activity
Seismic response
Struts
URM infill
Walls
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Summary:•Earthquakes cause on infills In-Plane (IP) and Out-Of-Plane (OOP) actions.•IP-OOP interaction may cause an anticipation of the OOP collapse.•The formulation of simplified models is a goal to be definitely reached.•A macro-model for infill IP-OOP response interaction is presented. Reinforced concrete frame structures with unreinforced masonry (URM) infills represent a common construction practice all over the world. To correctly assess the seismic performance of these structures, prediction of the behaviour of masonry infills under in-plane (IP) and out-of-plane (OOP) loading, as well as their interaction, is of primary importance. Different approaches are available in the literature with different levels of approximation for assessment of the IP-OOP infill response, showing increasing interest in this field. In this context, this paper presents a new macro-element model which can simulate the behaviour of URM infill walls under seismic IP and OOP actions. The model is the evolution of an approach based on a 4-strut configuration characterized by one horizontal strut, one vertical strut and two diagonal struts representing the infill wall. The struts are modelled by fibre-section beam-column elements and their compressive behaviour is defined by empirical strength and strain parameters. The paper also presents some equations to obtain the empirical parameters mentioned, based on the actual mechanical properties of infill walls. In the paper, the validation of the proposed model with the experimental results available in the literature is discussed. Further, the improved capacity to simulate the arching mechanism in infill walls under OOP loads and the better reliability in capturing the interaction between the IP and OOP behaviours are described.
ISSN:0141-0296
1873-7323
DOI:10.1016/j.engstruct.2020.111211