Bridging
and reinforced concrete system.
For high loads especially those involving LH series joists and girders, I
normally ask for some kind of connection at the bottom level making sure
that
welds are just there for stability and not the load transfer. Do not weld
to transfer any kind of loads or moment transfer if any ~ its just to
stabilize the joist or girder. Load will be transferred by your main conxxn
on top. Normally a 1'-0" x 1'-0" embed in precast panel or wall with flat
plate welded to the 1 ft^2 embed and inserted between bottom legs of joist
or girder will be enough.
Naeem Ghani, P.E.
On Oct 28 2009, Thomas Magnum wrote:
>My guess is that there is a misunderstanding. You do not use braces to
>provide positive anchorage. They stabilize, not anchor. It's now standard
>(page 33 of the '03 Vulcraft Catalog) to provide horiz bridging in the bay
>adjacent to a much stiffer element such as a wall. What sort of concrete
>panel is it? Could it be that the joist manuf thinks the bridging will be
>used to stabilize them? Are the panels more of a cladding than a support?
>
>Byron
>
>On Wed, Oct 28, 2009 at 11:50 AM, Kipp Martin <KMartin@carollo.com> wrote:
>
>> Ed,
>>
>> I don't do a whole lot of work with steel joists, so keep that in mind.
>> I've usually seen that X-bracing converted to horizontal bracing in the
>> end
>> bay. This is to allow the joist to deflect releative to the
>> non-deflecting
>> wall. I usually allow the use of either X-bracing or horizontal bracing,
>> leaving it up to the joist manufacturer. But in answer to your
>> question, I
>> don't see how X-bracing does not provide positive anchorage. I'd ask the
>> joist manufacturer to explain.
>>
>> --Kipp Martin
>> Carollo Engineers
>> Portland, Oregon
>> ------------------------------
>> *From:* Edward Jonson [edjonson@msn.com]
>> *Sent:* Wednesday, October 28, 2009 7:43 AM
>> *To:* seaint
>> *Subject:* Bridging for bar joist
>>
>> Question about anchorage of bridging. I have project where X-bracing of
>> end bay of bridging is called out on plans rather than continuing
>> bridging
>> to concrete panels. Joist manufacture claims this X-bracing does not
>> provide positive anchorage. So the question is does the X-bracing provide
>> positive anchorage? Any comments much appreciated.
>>
>> Ed Jonson
>>
>
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