Abstract
The Slotted-Hidden-Gap (SHG) connection represents an attractive alternative to the conventional knife plate connection for HSS braces of steel braced frames as it allows the brace to yield along its length without having to reinforce the connection. Prior studies have proven the effectiveness of this detail for circular and square HSS braces. However, no encompassing seismic design method or detailing rules exist for SHG square HSS members. To gain deeper insight into the behaviour of the SHG connection, a preliminary numerical parametric study of square HSS braces under a monotonic tension loading protocol was done to further investigate key factors influencing the connection's performance. The weld size and length as well as the gusset plate thickness are critical in the design of SHG connections and may hinder the connection performance if poorly designed or fabricated. A laboratory testing program, of four SHG HSS ASTM A1085 (254 × 254 × 13) brace specimens with different weld configurations, was also carried out. Keeping a 20 mm overlap length despite changing the overall weld size and length was sufficient to develop the yield resistance of the braces and to force fracture away from the connection region. Utilizing longer length smaller sized welds granted an additional 3.1% of brace strains compared to connections with shorter welds.
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