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J1D et al., Thanks for the help - it is a support for rigid bus conductors in an electric substation. the "p"s below are where the insulators mount...not much dead load, just problems with wind/seismic horizontal loads. regards - jm1 --p-p-p-- W-shape | |W-shape |...

Exactly - it is being used as a support tower for substation bus. The insulators attach at three points along each "flange" of the "I". jm1

Three 7' long W-shapes oriented as an "I" (X-Z plane if Y is up) mounted 23' supported at the center of the "I" by a single HSS. Like a cantilever with an "I" mounted on its end. Long time since school, and even at that moment connections were like doing the entire 20th century on the last day...

Hello, I have what is essentially a 7' x 7' "I" shape made up of W-shape beams supported by a single HSS column 23' tall at the centroid of the "I" shape. This structure is subjected to lateral/longitudinal/vertical loads. In order for the "flanges" of the "I" shape to remain stable there...