Question
The axial and reaction forces are different for response spectrum loads.
Answer
The response specturm load is a directional load, so it should be set in the direction of the primary mode to ensure that the axial and reaction forces are calculated equally in load combinations.
After performing seismic analysis, there are cases where the calculated reaction and axial forces are different.
Response spectrum load is a directional load. You need to check the option to set the response spectrum load in the direction of the primary mode, so that the axial force and the reaction force can be calculated equally in load combinations.