A frequent hallmark of impressive technical innovation is that at first glance it appears deceptively simple.
Another is that such innovation tends to be rapidly followed by the exclamation “Why didn’t I think of that?” The Angelina® beam is just such an example.
Angelina® beams are achieved by the apparently simple expedient of taking a standard I-section beam and making a single cut through the ‘web’ (the vertical member of the beam) following a specific wave-like line, using flame cutting. The resulting T-sections are then shifted relative to each other such that the wave-like edges periodically and regularly coincide. Welds are then made at those points, reuniting the two halves and resulting in the Angelina beam’s elegant and characteristic openings.