How to calculate the point of application of Load exactly on the Column due to these beams. (To know Whether column is Uniaxial or Biaxial)
And Beam 2 having an offset of 6 inches from the end. But in ETABS it comes from centre of Column no.? How to resolve this problem?
There is nothing like knowing if the column is uniaxial or biaxially bending. Most columns will be biaxially bending and that is a result interpretation point and not related to just this member offset. Smaller columns like this for small projects, it wont matter much if you dont account the offset. If the columns are longer,You can deal this condition by member offsets or by modelling the columns as walls.