FraMCoS 9 2016 Berkeley, California, USA

An SHCC overlay retrofitting strategy for unreinforced load bearing masonry

In the Western Cape Province of South Africa, multi-storey buildings of unreinforced load bearing masonry (ULM) were constructed before seismic resistance became a standardized requirement. The region lies in a light to moderate seismic zone in South Africa. It is…

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Year 2016
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Abstract

In the Western Cape Province of South Africa, multi-storey buildings of unreinforced load bearing masonry (ULM) were constructed before seismic resistance became a standardized requirement. The region lies in a light to moderate seismic zone in South Africa. It is foreseen that these buildings might perform poorly during seismic events due to their brittle in-plane shear failure mode. In response, a research project was launched to develop an overlay retrofitting strategy to enhance seismic resistance of ULM. As overlay material, strain-hardening cement-based composites (SHCC) is used. In this paper, a preferred failure mechanism is described and designed for by restricting the overlay thickness to allow multiple crack formation in the overlay, instead of overlay debonding. The strategy is verified by a triplet-type test on control masonry specimens, and two sets of specimens with 10 mm and 30 mm SHCC overlays respectively.