MpM, MpN, Mstrip are calculated in RAM connection

[VIVEKSHINE]

Dear engineers,
I'm checking the calculation for anchor bolt base plate connection. My client has sent me this calculation generated by RAM Connection. But there is no formulas shown in it.
RAM Connection directly gives the value. Not the formula.
How MpM, MpN, Mstrip are calculated in RAM connection?
Can any one help in this.

Thanks in advance

MpM: Plate bending moment per unit width at bearing interface for the cantilever m
MpN: Plate bending moment per unit width at bearing interface for the cantilever n
Mstrip: Maximum bending moment at the strip

 

[sbisteel]

Their is an option to have RAM connection "show formulas" in the output, you could ask your client to send you one of these expanded calculations to see how the program works.

Just be aware that this tends to turn a 3-4 page calc into a 10 page calc.

 

[SteelPE]

First, your attachment doesn't work.

Second, I have never used RAM connection, however if my memory serves me right, I believe RAM connection allows for two ways to report the connection design. One with straight checks that say the limit state is OK (bolt shear, bolt bearing, block shear etc). The second allows you to print out all of the equations used in the connection check. Ask the person who sent you the connection design to expand this portion of the calculation.

Third, if you are not satisfied with the calculations, send them back and asking for clarification in this area.

Hopefully this will help you a little bit.

 

[VIVEKSHINE]

@sbisteel

The report is with show formula option. But For MpM, MpN, Mstrip No formulas provided. Direct values given.

Refer attached Sample

@SteelPE
I didn't attached anything with my previous post. Please if you can help me provide formula to calculate.

MpM: Plate bending moment per unit width at bearing interface for the cantilever m
MpN: Plate bending moment per unit width at bearing interface for the cantilever n
Mstrip: Maximum bending moment at the strip

 

[SteelPE]

Again,

I have never used the program however, the terms M and N are oddly familiar to the terms used for bending in the two different directions of a base plate. Check the bearing capacity under base plate and then calculated the moment according to the cantilever M and N (attached) and see if you get the same answer.

This shouldn't be too difficult.

 

[SteelPE]

Oh, my, the program also give equation references. DG 1 eq 3.3.13 would be AISC design guide 1 equation 3.3.13. I don't know how more specific they could be.

Are you sure you should be using this program?

 

[VIVEKSHINE]

Hi,
I want to know how to calculate MpM, MpN, Mstrip from the applied load. AISC DG 1 does not give any clear idea about it. Please refer the attachment to understand the issue.

 

[SteelPE]

Here's a hint, it appears as if you have a bi-axial moment on this column. This will make calculating the moment in the base plate difficult as you will not have a uniform bearing stress under the plate. If you are unsure about whether or not the program is giving you the correct results why don't you create a column with a axial load only and then see how the program calculates the moment in the base plate. Should be pretty easy to figure out as M=wl^2/2 for a cantilever. The cantilever arm would me the m and n distances I sent you in the above post.

If you still can't get the same answer as the program then you should either call RAM for an explanation or stop using the program.

 

[dcarr82775]

SteelPE, in all fairness VIVEKSHINE isn't the one using RAM. He has been asked by his client to review calcs produced by RAM.

I would ask the design engineer to provide you with the info you request. If he/she did the calc they should know.

 

[sbisteel]

I'd also ask how you have end moments but no shear reaction.

 

[VIVEKSHINE]

JUST EXAMPLE I USED THAT SHEAR AND MOMENT VALUES.
PLEASE SEE THE ATTACHED OUTPUT.
THERE IS NO FORMULA SHOWN FOR MpM, MpN, Mstrip, i (Weld MOI)
If anyone familiar with these type of design please provide the formulas

 

[ztengguy]

Vivekshine,
I think your needle is stuck in a groove.

I would ask the Engineer that submitted it to you to provide. At least they are going to be required to send the calc, here we are not, and asking the same question over and over will not help your cause.