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Why is there a limit of 116mm concrete thickness

Posted by MURTAZA A AZHARover 3 years ago
Why is there a limit of 116mm concrete thickness

I am trying to design a fixing detail detail for a 1100mm high (1200mm post spacing) handrail. The posts and rails are 48mm tubular galvanised steel sections. The base is a steel deck plate slab and the overall slab depth is 130mm, with approx 70mm at the narrowest point(see attached drawing) .

The software says that a minimum depth of concrete is to be 116mm. is it safe to use 130mm slab thickness?

minimum slab thickness,130,depth
Structural Connections file 0
BB-MPN-Z2-20-DR-S-20302 [P02].pdf187.77 KB
1 Reply
Posted by Ask HILTI Teamabout 3 years ago

Thanks for your enquiry there is currently no design standard within Europe for composite metal decks . I'd suggest revisiting your design looking at the HST3 mechanical stud anchors which have additional data available for a slab thickness less than 100mm though it may lead to a larger baseplate and a different anchor arrangement.