Hi all, this post is almost entirely directed at the Bentley folks, because I want to make sure that RAM SS has been updated to take into account the cracked section factor on slabs as I would assume. From previous emails with Bentley I was informed that for concrete slabs the cracked section factor in RAM Modeler actually modifies the thickness of the slab and does not modify the moment of inertia directly as it would for walls and beams. Therefore for a 10 inch slab the gross moment of inertia per foot would be 1000 in^4 and the cracked moment of inertia assuming a 0.6 reduction would be ((10in * 0.6)^3*12/12) 216 in^4 in lieu of 600 in^4 (1000 in^4 * 0.6).
Also does the diaphragm stiffness cracked factor do the same where it will just modify the I gross of the section so the stiffness of the semi-rigid diaphragm would be Gross Moment of Inertia x Cracked Factor - Diaphragm * Elastic Modulus?
Thanks,
Scott B.