A variety of a damage-tolerant monolithic structures are disclosed, such structures having a substantially-planar element integral with or welded to one or more stiffening elements. Each stiffening element can includes a first stiffening flange having a generally rail-like structure running along the length of the planar element and one or more webbings connected to the planar element and extending away from the planar element to the stiffening flange, wherein each webbing includes a row of integral holes running along the length of the webbing, the holes being in a shape designed to hinder the propagation of a crack in the monolithic structure.