Hello,
I ran into a problem while doing a fatigue design check for a post groove welded to a base plate and appreciate any guidance on this matter.
In LTS-6 chapter 11, it gives you scenarios on how to solve two factors, finite and infinite life fatigue stress concentration factor(K_F and K_I), to determine the constant amplitude fatigue threshold (ΔF_TH). For the variable K_F, groove-welded tube-to-transverse-plate connections, the max size post thickness is 0.625". The problem I'm having is the post welded to the plate is larger than 0.625" in thickness (my design is 31/32"). What equations can I use if the thickness exceeds the max that doesn't require me to know the number of wind-load-induced stress cycles during the lifetime of the structure?
Thanks for the help!
I ran into a problem while doing a fatigue design check for a post groove welded to a base plate and appreciate any guidance on this matter.
In LTS-6 chapter 11, it gives you scenarios on how to solve two factors, finite and infinite life fatigue stress concentration factor(K_F and K_I), to determine the constant amplitude fatigue threshold (ΔF_TH). For the variable K_F, groove-welded tube-to-transverse-plate connections, the max size post thickness is 0.625". The problem I'm having is the post welded to the plate is larger than 0.625" in thickness (my design is 31/32"). What equations can I use if the thickness exceeds the max that doesn't require me to know the number of wind-load-induced stress cycles during the lifetime of the structure?
Thanks for the help!
