Portal frame with truss girder hand calculation

[takupfr]

Hi everyone,

I am preparing the IStructE exam and I am looking for a design method I could use for designing portal frame structures with truss girders. See sketch attached.

I there any simple formula i can use for getting the bending moment, shear and axial diagrams in the columns and truss under vertical and lateral loading?

Thank you in advance.

Regards,

Mathias.

 

[DaveAtkins]

It is called the portal method. You assume the location of the point of inflection in the column (midway between base and mid-depth of truss is what I would assume), and you assume the location of the point of inflection in the truss (midspan is what I would assume). Now, you have a determinate structure.