RAM Concrete Col Design

RE: RAM Concrete Col Design

Karl G — Thu, 23 Mar 2023 20:41:53 GMT

The 82.91 k-ft Top Minor Moment that is listed in the report is M2,min calculated from Eq 6.6.4.5.4. That clause states that the calculated end moments can be used to determine Cm.

If I uncheck the option to consider moment magnification in RAM Concrete Analysis – Criteria – General, re-run the analysis, and check the same column for the isolated load combination, I see the output below in the Column Design Report. These reported moments represent the calculated end moments from the analysis and do not consider M2,min.

The sign convention used by RAM Concrete Column is shown in the image below, which is taken from Section 4.3.3 in the RAM Concrete Column Manual. Note that when the sign of the top and bottom moment are opposite, the column is in double curvature.

Using this information, Cm is calculated as follows:

M1 = 36.85

M2 = -106.47

Double Curvature

Cm = 0.6 - 0.4*(36.85/106.47) = 0.46

RE: RAM Concrete Col Design

Seth Caudle — Thu, 23 Mar 2023 18:49:10 GMT

Start with H-3. 5.. All of the 16x30s between levels 1 and 3 give similar results, however.

RE: RAM Concrete Col Design

Karl G — Thu, 23 Mar 2023 18:46:30 GMT

Thank you for the model. Which column number should we review?

RE: RAM Concrete Col Design

Seth Caudle — Wed, 22 Mar 2023 12:34:11 GMT

The file name is "Austin-gravity (no steel) - NEW SC"

RE: RAM Concrete Col Design

Karl G — Fri, 17 Mar 2023 20:01:23 GMT

Please share the model using our Secure File Upload and post the file name here after it is uploaded.

RE: RAM Concrete Col Design

Seth Caudle — Thu, 16 Mar 2023 16:25:58 GMT

I am sorry. This should be in single curvature so Cm = 0.91