Bending moment due to wind on threaded tubular
Bending moment due to wind on threaded tubular
(OP)
I am working on a problem that invloves a threaded tubular that is situated vertically with the lower end being screwed into a base part, the upper end of the tubing is blanked off. I am trying to analyse the effect the bending moment caused by the wind will have on the integrity of the assembly.
The tubing is pressurised, so this will induce a tensile force on the threaded joint, which is easily calculated, however I am unsure as to who to relate the bending stress caused by wind velocity to the tensile stress that the joint is already subjected to.
I seen some literature regarding bending loads on threaded fasteners and it merely stated that the bending stress should be added to the tensile stress, but would like some other opinions as I am unsure as to whether this is a simplification that applies to small threaded fasteners speciffically.
Thanks in advance
The tubing is pressurised, so this will induce a tensile force on the threaded joint, which is easily calculated, however I am unsure as to who to relate the bending stress caused by wind velocity to the tensile stress that the joint is already subjected to.
I seen some literature regarding bending loads on threaded fasteners and it merely stated that the bending stress should be added to the tensile stress, but would like some other opinions as I am unsure as to whether this is a simplification that applies to small threaded fasteners speciffically.
Thanks in advance





RE: Bending moment due to wind on threaded tubular
The stress on the windward side is tensile and is additive to the joint stress. The stress on the lee side is compressive and subtractive from the joint stress.
The weight of the tubing may also need to be considered, if significant. It will produce a compressive stress.
All stesses are supperposed to get the final result.
Ted
RE: Bending moment due to wind on threaded tubular
RE: Bending moment due to wind on threaded tubular
RE: Bending moment due to wind on threaded tubular
RE: Bending moment due to wind on threaded tubular
the shear rating of the thread considers a complete circumference, no? i'd consider a segment of the thread (maybe start with 30 deg) ... i know the axail load applied (1/12th of the total), i know the moment reaction (sum the bending stresses over the arc), and i know the rating (1/12). consider larger and smaller segments. if you overload for a small segment, then is it reasonable to say that plasticiity will redistribute this peak load over a wider (acceptable) segment ?