Torsional effect on welded tubular connection
Torsional effect on welded tubular connection
(OP)
Hi All,
I have to design a welded tubular connection that connects 2 tubular members (like a T shape) in an off-shore platform jacket. One of the tubulars is a column (2225x80mm) and the other is a brace(1100X25mm). The brace exerts torsion on the column beside in-plane and out-of-plane bending moments. Is there a simple way or a closed formula that can be used to design this connection considering the torsional stresses. Actually, I want to stay a way from any "time consuming" FEM modelling.
As far as I know, according to AP-RP2A-WSD, tubular joint capacity considers axial and bending actions only (no torsional actions are involved). Is there any suggestion regarding how to consider this torsional moment in the tubular joint connection? (from AISC, API or any other codes or text books)
Thanks in advance
I have to design a welded tubular connection that connects 2 tubular members (like a T shape) in an off-shore platform jacket. One of the tubulars is a column (2225x80mm) and the other is a brace(1100X25mm). The brace exerts torsion on the column beside in-plane and out-of-plane bending moments. Is there a simple way or a closed formula that can be used to design this connection considering the torsional stresses. Actually, I want to stay a way from any "time consuming" FEM modelling.
As far as I know, according to AP-RP2A-WSD, tubular joint capacity considers axial and bending actions only (no torsional actions are involved). Is there any suggestion regarding how to consider this torsional moment in the tubular joint connection? (from AISC, API or any other codes or text books)
Thanks in advance






RE: Torsional effect on welded tubular connection
RE: Torsional effect on welded tubular connection
RE: Torsional effect on welded tubular connection
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Torsional effect on welded tubular connection
RE: Torsional effect on welded tubular connection
without going into a long step-by-step analysis and not knowing the loads, the following would be my first crack at it...
add a ring to the col at the top and bottom of the brace....then add an internal pipe space truss inside the col to carry the loads from the face of the col to the remaining portion of the col......
another less desireable option would be to add a pl diaphragm to the col internally at the top and bottom of the brace....
reinforcing the col locally may change the stiffeness of the brace/col interface and one may want to check the torsion connection assuming egual sttiffeness all-round...from Blodgett..shear=Tc/J, J={(b+d)^3}/6,
c={(b^2+d^2)^1/2}/2