Journal of the South African Institution of Civil Engineering
On-line version ISSN 2309-8775
DUNDU, M. Proposed partial resistance factors for the design of welded structures. J. S. Afr. Inst. Civ. Eng. [online]. 2010, vol.52, n.2, pp. 58-64. ISSN 2309-8775.
This paper describes tests to determine partial resistance factors that are to be used in designing small steel structures. Several welding skills were incorporated into the investigation so as to come up with different partial resistance factors. Different skills will then be included in the design procedure, allowing the engineer freedom to assess the availability of skills and to specify connection details accordingly. This investigation was carried out using butt and fillet-welded specimens in tension under static loading only. Half of the samples were welded flat and the other half were welded vertical. It is evident from the load-elongation graphs that plastic deformation is more extensive in specimens welded by experienced welders and that specimens welded flat are more ductile than those welded vertical. Vertical welding also resulted in a greater percentage of defects than flat welding. Most of the defects in the welds were a result of incomplete penetration, lack of fusion, slag inclusion, porosity and failure to weld to the given dimensions.
Keywords : partial resistance factor; butt and fillet welded specimens; welding skills; ductility; flat and vertical welding; defects.