Post:




I don't see these curved I-beams very often.  What are the benefits and downsides to using these? 
Are they stronger than a diagonal brace would be?  

Also, were they historically more prevalent than they are now?   In most of the places I see them
used, they're on a riveted structure.






Photos that I've taken so far are stored on my computer at:

    ~/Pictures/CTA_steel/


Photos I still need to take:

    - more of the curved I-beams at UIC-Halsted, taken from a side-angle, to make the I-beam flanges more clear

    - some of the cast stairway posts with decorative elements, at.. the Blue Line Damen stop?
                 (there may be some at the California stop too?)