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In the Forum: Audio Discussions
In the Thread: Mastodont DIY Rack: Wall Mount?
Post Subject: Atomic age buildingPosted by N-set on: 7/4/2013
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 Paul S wrote:
N-set, I've seen and done plenty of all-concrete construction, including floors and entire roof structures, standard, pre- and post-tensioned, and also shot-crete.  Ironically, concrete itself actually gets stronger over time, for many, many years (more than 60).  Although the iron reinforcement does not get stronger, it usually holds up OK, except in salty air or in salt spray, or where it was not sized, spaced, lapped, routed, and/or covered properly to begin with.  So, no surprise, it gets down to exactly how it was implemented.  In extreme economic/political conditions, some 3rd world concrete construction is nowhere near as strong as typical US post and beam with truss joists (eg., the World Trade Center...), and some would take the weight of a helicopter landing on it.  To absorb a gratuitous 500 kg out in a span, let's hope your building is (somehow...) the latter type.  Whether "between the chimneys" would help depends on exactly how they did it. If the floor structure is "headed"/cut out around the chimneys, it does not help, unless the chimneys are solid masonry and the racks could be fastened directly to the chimneys, as well as the wall behind them.  It also helps if the rack is right up aginst a full bearing wall, since it would then extend as little as possible into the floor span.


Paul, I've investigated my building a bit. The comparison of the post-WWII Eastern Europe and the (I hate this expression)
"3rd world", as you put it, is probably quite adequate, but there is one important difference: they really had nuclear blasts
 in mind when it comes to buildings from the 50's era! All the bearing walls (exterior and interior) are 38cm solid masonry
(possibly aditionally reinforced?). My floor is actually the last level before the roof so it carries all the weight of the heavy, concrete
slanted roof (through very elegant reinforced concrete supports) and whatever tons of wet snow happen to be on it.
It's supported from below by extra steel/concrete beams as well as a net of inner bearing walls (my floor sits on top of them).
The 500+kg monster will be in the span unfortunately, but right to the solid masonry chimney channel, incorporated in
an inner bearing wall, and some 1-1.5m from one of the support steel beam on the other side. I think the additional 500kg on a sq. meter
should be ok under such conditions. Tomorrow will show...

Cheers,
N-set

  

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