Robert Miller's Activities

RAM Concept - Beam Torsion

PPesek — Tue, 09 Dec 2014 23:20:57 GMT

We are investigating some post-tensioned beams that are failing the torsion checks (due to ACI 318-11 Eqn 11-18). Under the torsion design options, there is 'Beam', 'As Shear', 'As Bending', and 'Wood Armer'.

In the manual, you are clear on not using Wood-Armer for torsion design for beams. However, we would like to know if the 'As Shear' and 'As Bending' options are applicable to beams. Additionally, do you have any references that discuss this conversion of torsion for beam design?

Thanks,

RAM Concept Square Meshing and Instability

Robert Miller — Mon, 03 Oct 2022 16:06:20 GMT

Is there a known issue/bug where re-meshing results in an odd square meshing that causes an instability?

Ram Concrete Slenderness calculation (nonsway)

Brad Geyer — Sat, 14 May 2022 02:27:44 GMT

I am running a model in the Ram SS Concrete module and getting a few errors with the moment magnification factor exceeding 1.4. When I attempt to back-calculate the results the program is getting, I am not getting the same numbers. So my question here is two-fold:

1. Why aren't the results more transparent with its calculations of Cm, delta, beta, and Pc?

2. Why do my hand-calculated results not match the program results? Cm seems slightly off, and even if I use the program-calculated Cm to calculate delta, I don't get the same delta value. Is there a different equation being used than what ACI lists?

RAM Concrete Column Circular and Rect Columns in Same Line

Robert Miller — Sun, 12 Jun 2022 14:46:38 GMT

First time I have had a building with stacking circular and rect columns and I am finding the assigning bar templates to be a terrible headache since it assigns it per column line. RAM doesn't seem to be smart enough to design circular columns using only circular bar templates and same for rect columns. This is exacerbated by the limit of 3 bar templates max that can be assigned to a line. What am I missing here other than to have to manually assign the final bar template by view updating every column.

RAM Concept PT Pour Strip

Robert Miller — Tue, 15 Mar 2022 18:43:00 GMT

In reviewing this tutorial (https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/30231/modeling-a-pour-strip) I noticed that the orthogonal release of axial stiffness perpendicular to the pour strip seems to assume that the tendons parallel will be stressed after the pour strip has been cast. Recently, I have had to analyze an existing pour strip for potential problems and I knew nothing of when tendons were stressed, so I reduced the slab axial stiffness to near zero in both directions, which makes sense to me if the tendons parallel were stressed before pouring the strip back. Is this agreeable?

RAM Concept IP shear stresses

Robert Miller — Mon, 17 Jan 2022 17:09:26 GMT

Is there any use to the IP shear stress plots for determining "VQ/Ib" stresses at mid-depth rather than computing external to Concept using excel, etc? The values that come from the IP shear stress plots don't seem to be what I think they, are and I am not seeing in the manual where it explains them. Top and bottom IP shear stresses > 0 don't make sense in terms of VQ/Ib.

RAM Concept Moment Transfer to Columns

Meyer Raab — Mon, 12 Oct 2020 16:41:06 GMT

I am modeling a 2 way concrete transfer slab (4 stories above) in RAM Concept.

The columns are modeled as compressible, roller at far end. When I look at the moment diagrams in the slab there is a large jump in the moments as it crosses the column (e.g. 478 k-ft on one side of the column, 399 k-ft on the other side). Is Concept transferring that moment to the column?

Is there a report which will give me the loads applied to the column, not the column reactions? My Column reactions plan show no moment.

Thank you

Ask A Question I

Tue, 10 Aug 2021 00:00:45 GMT

Ask a question in a forum.

RAM Frame Single Angle AISC Code Check (Compression)

Robert Miller — Tue, 10 Aug 2021 14:44:09 GMT

I understand that RAM automatically prevents a code check on certain shapes that are often intended on being for tension-only. https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/3058/ram-frame---tension-only-faq

However, I do not understand why the 2010 AISC code check of compression on a single angle (vertical brace) can be done, but then it is disallowed for 2016 AISC code check.

What is going on here? Thank you.

Defect in Punching shear check in Single plate connection to HSS

Shady Abdelmessih — Thu, 01 Nov 2018 16:27:45 GMT

In Single plate connection to HSS, while checking punching shear on the HSS column support, RAM takes the lp (length of connection) as the width of the shear plate instead of the length. Please advise. Snapshots are attached for easy reference.

light gauge steel bearing walls

Abraham Getachew — Wed, 23 Jul 2014 22:23:46 GMT

I have a project that has four story composite residential floors on top of two story garage levels. The roof of the garage level is a concrete podium slab that carries the residential levels. Support for the residential floor system will be a combination of light gauge steel bearing walls. Some of the walls will have diagonal strapping (taking tension only) with vertical steel posts at the ends of the shear wall segments to resist lateral loads.

I was told that this can be modeled using other software than Ram Structural Systems. I have used Ram to model all concrete building and would like to use it even for the current project. Would you please give me some guidance on how to model the light gauge walls especially the walls with the diagonal tension only strappings (shear walls).

Thank you in advance for your help.

Creating DXF from RAM SS

Corey Barber — Wed, 23 Nov 2016 17:39:32 GMT

Is there a way to export a DXF of a framing plan in RAM SS? Is this through modeler of RAM Steel Beam?