Hand calculations for the bending & radial stresses in the base plate.
Hand calculations for the bending & radial stresses in the base plate.
(OP)
thread507-292170: Stress exerted on pipe column face by base plate stiffener???
I am using Roark's formula for Stress And Strain Table 24 case 21b to calculate the bending & radial stresses. Can I extrapolate the values above 0.8 for b/a ? Do you think that bending goes to zero for b/a > 0.8 ? Am I thinking right?
I am using Roark's formula for Stress And Strain Table 24 case 21b to calculate the bending & radial stresses. Can I extrapolate the values above 0.8 for b/a ? Do you think that bending goes to zero for b/a > 0.8 ? Am I thinking right?






RE: Hand calculations for the bending & radial stresses in the base plate.
RE: Hand calculations for the bending & radial stresses in the base plate.
Bending might not be zero for b/a greater than .8, but it can't be too much. Why don't you just use the .8 case to be conservative?
RE: Hand calculations for the bending & radial stresses in the base plate.
For my design, b/a is 0.909. Based on this b/a value, combined stresses are within the allowable limit but if I use 0.8 my design doesn't work.
I am thinking of extrapolating beta value based on b/a 0.909.What do you say?
RE: Hand calculations for the bending & radial stresses in the base plate.
RE: Hand calculations for the bending & radial stresses in the base plate.
I want to calculate Bending stress for b/a=0.909?
Roark's table gives us the Beta numbers for a given b/a value upto 0.8 but my b/a number is above 0.8 which is 0.909. What will be the correct approach to calculate the bending stress?
RE: Hand calculations for the bending & radial stresses in the base plate.
RE: Hand calculations for the bending & radial stresses in the base plate.
http://www.fhwa.dot.gov/bridge/images/sign36.jpg
Thanks a lot dhengr. I totally agree with your explanation of shear stress problem with no bending between the column & the fixed edge support. Can you please suggest me a good reference book or article for this kind of scenario?
I really appreciate your help.
Thanks again.
RE: Hand calculations for the bending & radial stresses in the base plate.
the moment will be reacted by tension in the 2 bolts and a distributed compression (as the plate bears up against the concrete foundation).
i'd've imagined that this had been analyzed in the past and a design rule created.
if not, and if you need an accurate answer, use FEA. roark and the like will give you something close, but doesn't look like it closely matches your geometry.
RE: Hand calculations for the bending & radial stresses in the base plate.
BA