Jake Nichols's Communities Activities

Elements - Convergence Tolerance

DIA_FW — Wed, 25 Jun 2014 16:29:00 GMT

Is there a general recommendation on the limits for convergence tolerance in elements? I'm analyzing a model without P-delta (design using amplified first-order analysis), and I have a few load cases that are failing to converge unless I set the tolerance to 1E-3. Is this too low? Nothing about the model appears to be inconsistent with my expected results.

Effective Section Modulus AISC 360-16, Specification F7

Jake Nichols — Thu, 09 Sep 2021 21:03:27 GMT

I am trying to double check some numbers I ran by hand for effective section modulus (Se). The scenario I find myself in can be seen in this column model.

According to AISC 360-16, Specification F7, Equation F7-3 Se is adjusted according to a change in effective width (be, equation F7-4)

I don't see how RAM Elements calculates this number. I can see the resulting Mn value (see highlighted portion of this design output).

Thanks in advance for any help.

2nd Order Analysis on 2D Braced Frames

Jake Nichols — Tue, 31 Aug 2021 22:10:04 GMT

Hello,

I have included links to two models below. In one model, I can run 2nd order analysis just fine, but the other seems to have issues. the only difference of any substance is that the loading is much heavier in one model, but the sections are capable of carrying that load. Note that both models run totally fine first order. I have consulted a few other experienced users in my office and we are all at a loss. Any help you can offer is appreciated.

Let me know if I can be of any more assistance on this issue. You can reach me at six zero six, three zero nine, four one four seven.

https://aro365531713-my.sharepoint.com/:u:/g/personal/jnichols_fhce_com/EdSVek9GTy9JgqlgbIrF9gQB_6Yzkt-nh6LH4u3xeHEubg?e=hBdjaw

https://aro365531713-my.sharepoint.com/:u:/g/personal/jnichols_fhce_com/ETUlHBYZThZMh26RKAGCIdIB1NQVM6nel9ssmbQ4HLKFGw?e=NbhBwc

Member suppression for Analysis

Jake Nichols — Wed, 06 Jan 2021 16:53:58 GMT

Is there a way to suppress a given element for analysis or Design? For example, I have a number of braces with a common description I would like to omit in order to see how it loads other elements. What I have been doing is deleting and undoing, but that's not very efficient.

If there is not a feature that does this, any ideas for a better methodology?

RAM Elements Load Combinations

Jake Nichols — Wed, 30 Dec 2020 21:53:44 GMT

When I use the "recover load conditions" button on the "Load conditions" panel on the home tab, I often end up with seemingly random loads on members. Some are user inputs and others are from area pressures. I keep clearing them out in the spreadsheet, resaving the load condition file (.CAS) and opening on the next model, but the loads are always there. They aren't always the same loads, but there is always a handful. Any idea how to remove them all from the load condition file? I have repeatedly cleared every load visible in the spreadsheet.

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Wed, 30 Dec 2020 00:40:34 GMT

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