Four Story Moment Frame Analysis Using Finite Element Method Spreadsheet
Professional tools for calculations and dimensioning of mechanical engineering problems using Excel spreadsheets.
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Axial tension tends to straighten the beam, thus counteracting the bending moments produced by the transverse load. On the other hand, since axial compression may greatly increase the bending moment and the slope and deflection of the beam, it is the more serious type of axial load.
To calculate the number of boards needed for purlins, divide the length of the purlin rows by the length of boards you are using (e.g. two boards of length eight feet for each 16 foot long purlin row).