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I think in that situation the fixings are usually going into a solid concrete floor and (at least by design) are not constantly stressed in one direction in the way that shelf will be due to its weight (and the weight of stuff on it). If it's being fitted into brick then I really don't rate its chances. If you were to use long masonry screws (preferably fitted into at least 2 separate bricks) then maybe, but I wouldn't fancy it with expanding bolts or plugs.
ffm
Not that kind of handrail.
Think floor standing, the type used in factories to separate walking routes from work areas. Where they are subjected to massive amounts of force from fat bastards leaning on them, badly driven pallet and forklift trucks etc. and still stay standing.