Weld effective lengths for round HSS cross-connections under branch axial loading

Abstract

Recent experimental and numerical research performed on fillet-welded, round-to-round, HSS cross-connections is reviewed, along with prior research on round HSS-to-rigid plate connections. The data from these weld-critical tests are then interpreted to determine practical weld effective lengths for such connections, in conjunction with permitting the directional strength-increase factor for fillet welds to round HSS. Recommendations are made for AISC Specification Section K5, and a design example is given to illustrate the approach.