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RE: Steel Beam Splice Location

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Two spans of 75’ each, or total?

 

The erector would love to avoid the temporary shoring, and if you can make it simple span, the increased weight would be compensated for by savings in erection.

 

If it is two spans of 75’ each, you can get longer than the std 60’ stock lengths. Check with a local fabricator for lead times for special mill order lengths and shipping length restrictions.

 

You could use a moment connection across the top at the center pier, but again, the cost of the connection may exceed the weight savings.

 

Bob Shaw

SSTC

 


From: Rich Lewis [mailto:seaint03(--nospam--at)lewisengineering.com]
Sent: Monday, February 27, 2006 10:57 AM
To: seaint(--nospam--at)seaint.org
Subject: Steel Beam Splice Location

 

What are the critical values of beam lengths and splice locations?

 

I’m detailing a pipe support bridge that is 2 spans of 75 feet.  I have a center support.  I want to have a continuous beam over both spans and I’m looking for the ideal splice locations.  I recall there is a critical value of 40 feet for steel beam lengths from the mill.  Are there several critical lengths other than just the 40 feet length?  I don’t want to put a splice at that point because the moment is too high.  I would like to get it as near as possible to the point of inflection.

 

Thanks for your insight.

 

Rich