Reference : Overcome of bed-joint imperfections and improvement of actual contact in dry-stacked ...
Scientific journals : Article
Engineering, computing & technology : Civil engineering
http://hdl.handle.net/10993/40621
Overcome of bed-joint imperfections and improvement of actual contact in dry-stacked masonry
English
Chewe Ngapeya, Gelen Gael mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
Waldmann, Danièle mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
In press
Construction and Building Materials
Elsevier
Yes
International
0950-0618
1879-0526
Amsterdam
Netherlands
[en] Dry stacked masonry ; contact layer ; actual contact area ; bed-joint imperfections ; surface roughness ; dry-stacked masonry blocks
[en] Several researchers studied dry-stacked masonry walls (DSM) and inferred that the actual contact surface between the different block rows and the compressive strength in such walls are reduced by bed-joint imperfections as well as by height differences between different masonry blocks leading both to high stress concentration. This paper concentrates on the first type on imperfections. Through experimental tests, it analyses the influence of bed-joint roughness on the load bearing capacity and investigates a strategy to improve the load-bearing capacity of DSM by placing an additional horizontal layer on the top face of raw masonry blocks. First, different contact layers using conventional and auxetic materials were applied. Then 20 dry-stacked masonry prisms built with raw and improved masonry blocks were tested under axial compressive load until failure. Prescale Fujifilm strips were used to measure the actual contact in the bed-joints. Experimental tests show that the use of a contact layer with well-defined material properties enables firstly to increase the actual contact area in the bed-joints from 23% to 98% of the nominal contact area and secondly to increase the load-bearing capacity by 14 to 97%. In addition, the contact layer with an auxetic material shows a significant capacity in altering the lateral expansion in the block units. The outcomes show that although the bed joint roughness influences the stress distribution in a dry-stacked masonry block, a contact layer with well-defined material properties enables to overcome the roughness induced by the bed-joint imperfections.
http://hdl.handle.net/10993/40621

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