Formulas: Chord-Stress Interaction Parameter

Formula 1

Formula 2

Equation K1-5

Equation K1-6

where

$P_{r o}$ and $M_{r o}$ are determined in the HSS chord member on the side of the joint that has lower compression stress for round HSS and higher compression stress for rectangular HSS. $P_{r o}$ and $M_{r o}$ refer to required strengths in the HSS chord: $P_{r o}=P_{u}$ for LRFD, and $P_{a}$ for ASD; $M_{r o}=M_{u}$ for LRFD, and $M_{a}$ for ASD.

Formula 5

$P_{r o}$ and $M_{r o}$ refer to required strengths in the HSS chord: $P_{r o}=P_{u}$ for LRFD, and $P_{a}$ for ASD; $M_{r o}=M_{u}$ for LRFD, and $M_{a}$ for ASD.

Formula 6

Formula 7

$D / t \leq 50$ for round HSS T-, Y-, and K-connections

Formula 8

$D / t \leq 40$ for round HSS cross-connections

Formula 9

$B / t$ and $H / t \leq 35$ for rectangular HSS gapped K-connections and T-, Y-, and cross-connections

Formula 10

$F_{y} / F_{u} \leq 0.8$ (Note: ASTM A500/A500M Grade C is acceptable.

Found in

• GENERAL PROVISIONS AND PARAMETERS FOR HSS CONNECTIONS