Ram Concept Prestressed Flexural Members Class C

RE: Ram Concept Prestressed Flexural Members Class C

Stuart Riesner — Fri, 01 Nov 2019 21:45:20 GMT

Seth,

We figured out the issue. The PT classification is listed under the "Environment" setting for the design strip. We had initially thought the Class U, T, and C in the environment selection to be a coincidence with the naming of the PT classifications but not related because environment is not the only parameter used to determine which PT class to use in design. Also, there was no mention of Uncracked, Transitive, and Cracked in the Environment setting, just Corrosive, Normal?, and Protected.

We would recommend that this setting be changed to "PT classification" or "PT Assumed Behavior" to match the code nomenclature which may point users in a more appropriate direction than "Environment". I can only speak for the nomenclature in ACI, so I apologize if this aligns with AS or some other code.

Thank you again for your help, this forum has been a very useful resource.

RE: Ram Concept Prestressed Flexural Members Class C

Stuart Riesner — Thu, 31 Oct 2019 15:25:36 GMT

We do have our design strips set to one-way, and the max allowable capacity calculated by Concept is the 12 root f'c, so we aren't being limited to Class U.

RE: Ram Concept Prestressed Flexural Members Class C

Seth Guthrie — Thu, 31 Oct 2019 15:07:53 GMT

Per the ACI spec, all post-tensioned two-way slabs are considered as Class U with ft ≤ 6 root fc', but if you specify design strips that ate class C beams or one-way slabs you could get around that.