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Ok. The question says the new gym would be 52 x 92
Also, it says the current dimensions are 52 x 82, not 52 x 92. Which is correct?
Ok. So you need a beam that is 82' supporting 40' joists on one side and the existing 52' joists on the other side. Correct?
How frequently can you span columns for the new 92' beam?
What is the city and state so I can look at snow loading?
What is supporting the joists now? A beam or a bearing wall?
Please re-read your question and my questions.
The 42' addition means a new 42' bar joist, not a new 68' bar joist. I'm very clear on the picture and the description, but your numbers and descriptions are not adding up and making sense.
That makes sense when explained that way, but that is the first time it was explained that way.
W40x436 will limit total load deflection to about 2.75" (L/360)
Correct. And that length of beam may be hard to transport. It will probably need to be in thirds and full penetration welded on site.
Do you have any other questions for me on this topic? If you could rate my answer, I would appreciate it.