lateral Story force in dynamic analysis

[shahab_nab]

Dear Seismo team

How can I find story force(=story shear) in dynamic analysis?.
I have done a dynamic analysis, and I want to compare each story shear force from the seismic action, with "equivalent static force" pattern along the story levels. All I found, was "TOTAL" base shear .vs relative displacement in hysteretic curve tab.

[huffte]

Here is one way in which I have done this. There may be easier ways, but this does work.

1. In the Post-processor, select
"Element Action Effects"
"Frame Forces"

2. Check the boxes for all columns in the story under question.

3. Select the appropriate member shear corresponding to the direction in which you wish to evaluate story shear.

4. Hit "Refresh". You will see a plot of colukmn shear vs. time for all of the selected columns.

5. In the plot, right-click and select "Plot Options".

6. In the Plot Options dialogue, select the "Data" tab. I the lower right hand corner of the data screen you will see an icon of two sheets back to back. This is the copy tool. Left click the tool to copy all of the data to the clipboard.

7. Open Excel and paste the data from the clipboard into excel. You will now have column shear for each of the selected columns vs time.

8. Creat a new column in excel which adds the column shears at each time step.

9. You now have story shear vs. time in this new column.

It's a bit involved, yes. But it does work.

If there are easier ways, someone please chime in.

Best of luck shahab_nab.

[shahab_nab]

Thank you very very much, Dear Huffte.

[seismosoft]

We might have misunderstood things, but we would suggest an easier alternative to steps 5&6 above, consisting of a View change from 'graph' to 'values' and then right-clicking, selecting all data, and copying.

Also, use the 'Groups' facility to be able to select all columns of a given story with a single click.

Seismosoft Support

[shahab_nab]

Yes, this is right, and I use it with checking "CUMULATIVE" option in "frame force" tab after steps 1 and 2 from Huffte instruction.
But still there is a question, How about Braced frames Like concentric braced frame, How We can find story shear(= lateral seismic force of a single story)?.
I am anxious to hear from you about

Thank you very much Dear Sir/Madam

[seismosoft]

Dear shahab_nab,

You may read the axial load in the braces and then multiply it by the cosine of the brace angle, in order to obtain the corresponding horizontal component, the sum of which contributes to the storey shear.

Seismosoft Support