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.
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