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Innovative retrofitting materials for brick masonry infill walls

Authors: Mora Gómez, Juan;

Innovative retrofitting materials for brick masonry infill walls

Abstract

Last seismic events in Southern Europe have highlighted the vulnerability in the most usual constructive typology in contemporary architecture: framed structures with masonry infills. Contemporary structures have a good capacity to withstand these actions, given that they were considered for their design according to modern codes. Nonetheless, nonstructural elements as masonry infills show a high degree of damage even for medium magnitude earthquakes, causing casualties and high economic losses. For decades, these elements have been considered as nonstructural and therefore they were not requested to have resisting conditions. Given this, there is a large segment within the building stock in seismic prone areas that needs to undergo preventive action, specially for out-of-plane loads. This can range from a mere union of the infills to the frame structures to a reinforce of the elements, which can also be applied to the case of already damaged elements. The potential benefits go beyond the mere stability of nonstructural elements, as this would improve the behaviour of the whole structure to face seismic events. Some new fibre-based materials for structural reinforcement based in braiding techniques have been developed in the last years in the Universidade do Minho, as an alternative to conventional FRP rods. These materials have several advantages, out of which it can be remarked the possibility of designing the composition according to mechanical requirements and the implication of low-tech and low-cost procedures for its production. The main purpose on this thesis will be the assessment of the application of this material as reinforcement for clay brick masonry, using the technique of Textile Reinforced Mortars, considering out-of-plane actions. This has been done through a basic experimental campaign in which it has been evaluated the improvement in the behaviour of masonry samples subjected to flexural loads. The material was applied with variations in reinforcement ratio in order to have some parametrical confrontation. Other samples included commercial solutions, so as to have a reference on already existing materials, and the control samples were unreinforced. The obtained results for the innovative materials were highly satisfying in terms of ductility enhancement, obtaining big deformations with a considerable flexural capacity, and a considerable increase in strength. Furthermore, the use of different materials within a composite results in the combination of its properties. The future development and enhancement of this material presents a high potential as an economic and easy to apply method for brick masonry reinforcement, with the possibility of tailor-made properties.

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Portugal
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
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