An experimental and theoretical investigation of the ultimate shear re
sistance of tapered aluminium girders is described. Failure of all the
test girders occurred suddenly and catastrophically, with little warn
ing, due to rupture of the welded web-flange boundary around the upper
tension diagonal corner of the rest panel. A simple analytical soluti
on has been developed for predicting the ultimate shear resistance of
such panels, which takes account of the reduced yield strength of the
heat-affected weld zone and shows satisfactory correlation with the te
st results. (C) 1998 Elsevier Science Ltd. All rights reserved.