Beam pretensioning 1

[rjkejr]

Has anyone run across formulas that take axial loading into account while calculating transverse deflection?

Most texts I have read, assume that the axial force in a beam is approximately zero. Thereby allowing the use of pure bending formulas. I'm trying to determine the effect of axially pretensioning a beam on transverse deflection. So this is assumption doesn't work in my case.

 

[strokersix]

Try Roark's Formulas for Stress and Strain.

Mike

 

[Biggadike]

Roark's stress and strain is a good way forward but if you were looking for a first-order calculation to get a 'feel' you could try splitting the problem in two:

First calculate the deflection of the beam at the nominal load, then calculate the straightening effect of the axial tension on the deflected beam. The law of superimposition should mean that you get a fair idea.