Civil Engineering Association

Stitch Spacing and Local Buckling in Seismic‐Resistant Double‐Angle Braces

The behavior of back-to-back double-angle bracing members subjected
to out-of-plane buckling under severe cyclic load reversals is investigated.
Eight full-size bracing members made of double angles of A36 steel with welded
stitches and end gusset plates were tested under large cyclic deformations representative
of severe earthquakes. Two types of section configuration were investigated,
which included conventional and strengthened back-to-back sections. The
first specimen was designed according to the current design practice, and the effects
of stitch spacing and width-thickness ratio were studied by changing those
parameters in subsequent specimens. The tests showed that early fracture due to
severe local buckling of the outstanding legs was the common mode of failure of
conventional back-to-back angles. Local buckling was so dominant that stitch spacing
did not play a major role. Smaller width-thickness ratio reduced the severity
of local buckling, leading to an increase in ductility and energy dissipation capacity.
Strengthening of conventional back-to-back angles by welding two inclined
plates did not improve member response because of asymmetrical buckling.

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