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Steel Joist 20 H7

Steel Joist 20 H7

Steel Joist 20 H7

(OP)
We are evaluating a series of cracks that has been developing during the last month on a lightweigth mezzanine structure. The structure was built on 1985 and five years ago a series of cracks developed on the 2.5 thin concrete slab.  The construction drawings describes the joist elements as 20 H7 supporting a 2.5 inches concrete slab and a wire mesh reinforcemnt.  The mezzanine slab was rated at that time capable to resit live loads up to 125 psf.  

Where can I find the mechanical properties, load tables or any information on that specific type of steel joist.   

RE: Steel Joist 20 H7

SJI has the 75 year manual available which has all the info you need for a 20H joist.  This is a very good, valuable document you should have.

SJI Publications

RE: Steel Joist 20 H7

the manual is a "must have".

RE: Steel Joist 20 H7

JAE: Great minds think alike? smile

RE: Steel Joist 20 H7

I bet we hit the SUBMIT button within a second of each other.

RE: Steel Joist 20 H7

Values from SJI - 1978

20H7: Nominal Depth = 20 in
      Resist Moment = 499,000 in-lbs
      Max End Reaction = 5400 lbs
      Approx WT = 10.7 lbs
      Maxmum Tensile Stress= 30,000 psi

If you have the span, I can give you the allowable loads.

RE: Steel Joist 20 H7

I went to SJI seminar and got education credits and free 41st Edition manual for free. It was a great seminar and the breakfast and lunch wasn't bad either. I went to one in Long Beach, California although I live and practice in NY. They have it all throughout the country at various time. Check them out. It was definitely worth the money for me.

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