surface bonding conrete engineering


 
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apease



Joined: 07 Mar 2009
Posts: 2

PostPosted: Sat Mar 07, 2009 8:26 am    Post subject: surface bonding conrete engineering Reply with quoteFind all posts by apease

I want to build a small semi-underground shed with dry-stacked concrete block construction. Engineering is required for this by the county and I picked an engineer who is unfamiliar with this method. I found the following table for him from the UBC that is also referenced by one SBC manufacturer (Quikrete).

Table 1205.3.1 excerpts:
Max compression = 40psi
Max shear = 10psi
Max flexural tension vertical span = 18psi
Max flexural tension horizontal span = 30psi

However, the dirt loads he gets exceeds these figures. Seeing all the writeups of using this technique for basements and the manufacturer's claims that SBC is as strong as conventional mortared block, I'm hoping these is some flaw in my engineer's approach. I would think that at least for shear and tension the SBC would be irrelevant and only the rebar would have a significant impact. So, I'd like to find a table that has the same information as Table 1205.3.1 but for conventional mortared block. In that way, I hope to show that conventional mortared block would also be insufficient if taken alone, and that the relevant figures are from the rebar. Can someone help?
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nanrehvasconez



Joined: 25 Feb 2008
Posts: 329

PostPosted: Sat Mar 07, 2009 5:31 pm    Post subject: Reply with quoteFind all posts by nanrehvasconez

If the block does not meet the lateral load required, the engineer needs to add steel reinforcement and upgrade the quality of grout to be used to fill the block cavities.

Also consider a way to waterproof the structure.
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apease



Joined: 07 Mar 2009
Posts: 2

PostPosted: Sun Mar 08, 2009 1:29 am    Post subject: Reply with quoteFind all posts by apease

I'm afraid that's the question - does it in fact meet the lateral load required, and if not, can steel make it sufficient. My guess is that there's a flaw in the current reasoning, since most of the structural content would be in the steel. So I need the equivalent figures for conventional masonry. SBC is a waterproof coating.
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