This paper summarizes the numerical investigation the fatigue crack propagation in CHS X-joints under

constant amplitude brace in-plane bending, in parallel with the experimental investigation reported in the

companion paper. The finite element procedure examines the effects of the crack propagation angle, the

crack-front profile and the interaction between adjacent fatigue cracks on the fatigue driving force, measured

by the stress-intensity factors.-This paper summarizes the numerical investigation on the fatigue crack propagation in CHS X-joints under

constant amplitude brace in-plane bending, in parallel with the experimental investigation reported in the

companion paper. The finite element procedure examines the effects of the crack propagation angle, the

crack-front profile and the interaction between adjacent fatigue cracks on the fatigue driving force, measured

by the stress-intensity factors.