Q. How is combined shear loads determined in saddle calculation using AutoPIPE Vessel?


Example:

From AutoPIPE Vessel output report, search for section "Location of dominant stresses and worst cases", and scroll down the report to any one of the Cases Studies to a "Moments and loads in plane of saddles". Find Shear loads:

a. Support #1=

25,761.4
37,483.9 

b. Support #2 = 

14,113.1
8,774.7

b. Support #3 = 

34,458.3
13,850.0

How are these values calculated?

Answer: 

Similar to how maximum shear load Qi are determined in saddle calculations, they are the result of the vectorial sum of the Vertical and Horizontal shear loads calculated in the equivalent beam: