Nondimensional parameters for describing the geometry of a tubular connection are given in the following list. Beta, eta, theta, and zeta describes the surface topology. Gamma and tau are two very important thickness parameters. Alpha (not shown) is an ovalizing parameter, depending on load pattern (it was formerly used for span length in beams loaded via tee connections).

b (beta)

d/D, branch diameter/main diameter

Z (eta)

branch footprint length/main diameter

d (theta)

angle between branch and main member axis

Z (zeta)

g/D, gap/diameter (between balancing branches of a K connection)

g (gamma)

R/T, main member radius/thickness ratio

t (tau)

t/T, branch thickness/main thickness

In AWS D1.1 [1], the term "T-, Y-, and K connection'' is used generically to describe simple structural connections or nodes, as opposed to coaxial butt and lap joints. A letter of the alphabet (T, Y, K, X) is used to evoke a picture of what the node subassemblage looks like.

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