HERA Report R8-43: The use of effective full penetration of T-butt welds in welded moment connections

HERA Report R8-43: The use of effective full penetration of T-butt welds in welded moment connections

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Authors: Dr Hafez Taheri ; Michail Karpenko; Alan McClintock; Volkan Yakut; Charles Clifton;  James Lim;  Dr Gary Raftery;  Dr Pingsha Dong;  Dr Xianjun Pei
Edition: R8-43: 2021
Description: PDF

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Abstract: Welded moment-resisting connections are used in the rigid frames of high-rise buildings designed to NZS 3404.1 and detailed to HERA reports R8-15 and R8-28 and SCNZ Connection Guides (SCNZ 14.1&2: 2007). The Connection Guides and NZS 3404.1 allow using fillet welds for MRCs. However, most of the design specifications call for the complete penetration/strength butt welds (CPBWs). CPBWs are easier to design as they do not require additional calculations but are more expensive to fabricate than fillet welds and partial penetration welds.
This report introduces a new type of partial penetration butt weld, the “effective full penetration butt weld” (EFPBW) that can be used in lieu of CPBWs in moment-resisting frames (MRFs) and other connections with a similar load path in the welds. The EFPBW has performance equivalent to that of the CPBW, while being significantly lower cost to fabricate. It allows for the welds specified as the CPBW to be replaced by EFPBW following the procedure outlined in this report.