How to calculating the frequencies of a structure in the analysis together with wind load and selfweight

Following is an example where wind and dead load are accounted for together in the frequency calculation

LOAD 2 LOADTYPE Wind TITLE WIND 7 X – USED FOR FREQUENCY CALCULATION
*
SELFWEIGHT X 1
SELFWEIGHT Y 1
SELFWEIGHT Z 1
*
WIND LOAD X 1 TYPE 1 OPEN
MODAL CALCULATION REQUESTED

If you need to do this for all wind directions, you need to use CALCULATE RAYLEIGH FREQUENCY instead of MODAL CALCULATION REQUESTED because the later can be used only once in a file.

You may also need to add the CUT OFF MODE 25 command as shown next to ensure that mass participation in around the 90% mark
...
CUT OFF MODE 25
LOAD 1 LOADTYPE Mass TITLE SELFWEIGHT
SELFWEIGHT X 1 LIST ALL

Thanks for the fast reply.
If you use the wind load in one direction, the recording will be of this type:


DEFINE WIND LOAD
TYPE 1 WIND 7 X ZONE
INT ................
CUT OFF MODE SHAPE 25
LOAD 1 LOADTYPE Mass TITLE SELFWEIGHT
SELFWEIGHT X 1 LIST ALL
SELFWEIGHT Y 1 LIST ALL
SELFWEIGHT Z 1 LIST ALL
MODAL CALCULATION REQUESTED
LOAD 2 LOADTYPE Wind TITLE WIND 7 X
WIND LOAD X 1 TYPE 1 OPEN
LOAD COMB 3 SELFWEIGHT+WIND 7 X
1 1.0 2 1.0
PERFORM ANALYSIS PRINT ALL
FINISH

And if a few, it is this:

DEFINE WIND LOAD
TYPE 1 WIND 7 X ZONE
INT ................
TYPE 2 WIND 7 Z ZONE
INT ................
CUT OFF MODE SHAPE 25
LOAD 1 LOADTYPE Mass TITLE SELFWEIGHT
SELFWEIGHT Y 1
CALCULATE RAYLEIGH FREQUENCY
LOAD 2 LOADTYPE Wind TITLE WIND 7 X
WIND LOAD X 1 TYPE 1 OPEN
LOAD 4 LOADTYPE Wind TITLE WIND 7 Z
WIND LOAD Z 1 TYPE 1 OPEN
LOAD COMB 3 SELFWEIGHT+WIND 7 X
1 1.0 2 1.0
LOAD COMB 7 SELFWEIGHT+WIND 7 Z
1 1.0 4 1.0
PERFORM ANALYSIS PRINT ALL
FINISH

I understand you correctly?

In none of the scenarios that you have mentioned above, would the wind loading in any direction be included in the frequency calculation. However if I am understanding right, you want to calculate the frequency for dead plus wind.

If your intention is to calculate the structural frequency for cases like DL+WL in X, DL+WL in Z etc, this is what you should do

DEFINE WIND LOAD
TYPE 1 WIND 7 X ZONE
INT ................
TYPE 2 WIND 7 Z ZONE
INT ................
…
LOAD 100 Frequency calculation for DL+Wind in X
SELFWEIGHT X 1
WIND LOAD X 1 TYPE 1 OPEN
CALCULATE RAYLEIGH FREQUENCY
*
LOAD 101 Frequency calculation for DL+Wind in Z
SELFWEIGHT Z 1
WIND LOAD Z 1 TYPE 1 OPEN
CALCULATE RAYLEIGH FREQUENCY
…

Maybe I'm not accurately express my thoughts)
I need to determine the support reactions
structure. On the structure affects the wind and its own weight. As I understand, for a complete analysis must take into account fluctuations in the structure itself, with the help of
the natural frequencies of the structure.
In the end, I need to get the exact support reactions, taking into account all the loads, for example by wind along the x axis.
That is, I do not quite understand how to lay the wind, its own weight and
oscillations
structure. Support replied that
natural oscillations of the structure prescribed by CALCULATE RAYLEIGH FREQUENCY or MODAL CALCULATION REQUESTED, but not described how) In the examples to which they refer are no similar calculations.

maybe you could make a simple file for example, even for simple beam.)

Seems like you are trying to capture the dynamic effect due to the wind loading plus dead load and trying to find out the structural responses like displacement, support reactions, member forces due to that. That is not possible. The wind load generation facility that you are using in your example, generates static loads and does not include any dynamic effect.

I have attached an example where I have demonstrated the usage of the both frequency calculation commands in an example model ( Load case 1 – RAYLEIGH FREQUENCY, Load case 2 – MODAL CALCULATION and Load case 3 – static dead load ). Please note that the results like displacements, support reactions, member forces etc for all these cases would be identical as  all these results are static analysis results for wind + dead load acting together. In addition the load case 1 also report natural frequency for the structure when constrained to vibrate in a mode that is similar to the displaced shape under the dead + wind load. Similarly the load case 2 reports natural frequencies of the structure after carrying out a full eigen solution. The wind + dead loads defined are internally converted into masses for the dynamic analysis for this load case 2.

Dynamic_analysis.std