128) The overlap of batten plates with the main members in welded connections should be more than[where t is thickness of thinnest outside plate or angle]

129) The slenderness ratio of lacing bars should not exceed

130) Economical depth of a plate girder corresponds to

131) Shear buckling of web in a plate girder is prevented by using

132) Horizontal stiffener in a plate girder is provided to safeguard against