A number of fixings at 250 mm centres with a design shear load of 0.94 kN are to be used for supporting a balcony, some over a door threshold, and some over full height wall either side. how do I work out shear capacity of each bolt and do we need to consider local brick failure, brick edge failure in x and pushing out in y? The building of timber construction and has brick façade.
Thanks for the question. The performance of any anchoring system into masonry is very much limited by the base material itself and given the huge variation in types and strengths it is impossible to test every one.
The HY270 resin injection mortar was tested in the largest range
of masonry base materials of any of our anchors . When you look at the
published data, (Here)
the minimum embedment tested is 50mm in a masonry unit not less than 100mm
thick.
If you are able to match your unit onsite against one that we have tested, you can utilise the published Design Resistance values. If you cannot then we would refer you to British Standard BS8539:2012 which provides guidance regarding designing, installation and testing and evaluation of fasteners into masonry units where no data is available.