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Mechanical interpretation of infills-to-frame interaction: contributions to the global base shear for strut-based frame models

Gentile, R; Uva, G; Pampanin, S; (2018) Mechanical interpretation of infills-to-frame interaction: contributions to the global base shear for strut-based frame models. In: Proceedings of the 16th European Conference on Earthquake Engineering 2018, Thessaloníki, Greece. (pp. p. 12174). Green open access

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Abstract

The presence of infills has substantial effects on the behaviour of frame structural systems, both in the linear and non-linear behaviour. Different effects might arise at global (increase in strength and stiffness, modification of the plastic mechanism) and local level (e.g. triggering of shear failures in the columns). The global effects can be captured by adopting numerical macro-models (e.g. representing the infill panels as equivalent struts), while local effects can be typically better captured by using FEM micro-modelling. Focusing on single- or multiple-strut macro-modelling strategies, in this paper a mechanically-based procedure to decouple the frame and infills contributions to the overturning moment (and hence base shear) capacity for any value of the global displacement is proposed. The method is applicable regardless of the distribution of the infills and of the non-linear Axial loadAxial strain relationship of the equivalent struts. For these reasons, such procedure can be applied to post-process the results of non-linear pushover or time-history analyses of different types of infilled frames (material-wise) as well as be adopted as a simplified analytical approach, such as SLaMA (Simple Lateral Mechanism Analysis), to derive the capacity curve of an infilled frame whilst capturing the proper internal actions. An application of the method on an experimentally-tested one-storey one-bay masonry infilled frame is used to calibrate the adopted numerical model. Furthermore, the method is applied to the pushover analysis of a two-storey one-bay masonryinfilled RC frame, with uniform or “pilotis” infill distributions, modelled by means of a single-strut approach. The results confirm the suitability of the proposed method in decoupling the frame and infills contributions to the total overturning moment.

Type: Proceedings paper
Title: Mechanical interpretation of infills-to-frame interaction: contributions to the global base shear for strut-based frame models
Event: 16th European Conference on Earthquake Engineering, 18 - 21 June 2018, Thessaloníki, Greece
Location: Thessaloniki, Greece
Dates: 18 June 2018 - 21 June 2018
Open access status: An open access version is available from UCL Discovery
Publisher version: http://papers.16ecee.org/files/Gentile16ECEE%20sub...
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Infilled structures; Non-linear analysis; Infills-to-frame interaction; Strut-based model; Overturning moment
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10065774
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