Abstract
Experimental results show that the most important issue in preventing fracture failure is to assure good welding quality. Obvious welding defeats cause cracks to develop early and propagate quickly, resulting in poor ductility and energy absorbing ability. WAH geometry and size also have great effect on connection ductility. In the experiments of this chapter, the access hole have quadric circle curve at the end and the beam web cuts the flange in a right angle. The stress concentration here causes the flange torn open at this place. This should be avoided in connection design. Improved WAH geometry can be found in FEMA-350 and Code for Seismic Design of Building. Supplemental welds between beam web and shear tab can improve connection stiffness and elastic strength, while having little effect on plastic strength of the connection. In steel structures that work in normal load cases, the beam-column connections work in elastic stage and supplemental welds are favorable for the connections.
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