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StructuralEng
StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 7250
Experience:  Structural Engineer
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I have an existing gym that we want to expand. the current

Customer Question

I have an existing gym that we want to expand. the current dimension is 82' x 52' we want to expand the 52' to 92' The Idea is to install a steel beam (82') and install bar joists 68' long to a new cmu wall. The new beam would support the existing sloped roof on one side and new bar joists on the other side. My question is what size beam would we need
Submitted: 10 months ago.
Category: Structural Engineering
Expert:  StructuralEng replied 10 months ago.
Hello
Expert:  StructuralEng replied 10 months ago.
I can help
Customer: replied 10 months ago.
Great
Expert:  StructuralEng replied 10 months ago.
The dimensions are not working out with the description
Expert:  StructuralEng replied 10 months ago.
To go from 52 X 82 to 52 X 92 means only a 10 X 52 addition.
Expert:  StructuralEng replied 10 months ago.
You're describing a 68 X 82 addition
Customer: replied 10 months ago.
My question says expand the 52' to 92'. The new gym would 82x92.
Expert:  StructuralEng replied 10 months ago.

Ok. The question says the new gym would be 52 x 92

Expert:  StructuralEng replied 10 months ago.

Also, it says the current dimensions are 52 x 82, not 52 x 92. Which is correct?

Customer: replied 10 months ago.
Picture a rectangle 52' x 82'. We want to expand the gym to 92' adding 40' to the 52' dimension. Thus resulting in a gym measuring 92 x 82.
Expert:  StructuralEng replied 10 months ago.

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?

Customer: replied 10 months ago.
You need to read the question. I stated that the beam needs to support the existing sloped roof on one side and new 68' bar joist on the other side ( 1/2 of 52 = 26 26 + 42 addition = 68' no columns can be used. It's a Gymnasium used for basketball. The beam needs to spam the full 82'. The Building is located in the Boston area so snow load must be considered.
Expert:  StructuralEng replied 10 months ago.

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.

Customer: replied 10 months ago.
Read the question.
- existing gym
-52 ft width
-sloped roof which means the ridge is at 26 ft
-we are extending the building 42 ft
- the new beam will replace the ridge
-42 + 26 = 68 ft bar joists
- what size beam do we need to support 1/2 of the existing roof and the proposed new roof.
-
Expert:  StructuralEng replied 10 months ago.

That makes sense when explained that way, but that is the first time it was explained that way.

Expert:  StructuralEng replied 10 months ago.

W40x436 will limit total load deflection to about 2.75" (L/360)

Customer: replied 10 months ago.
Sorry. I guess I made to many assumptions
The weight of that beam would be 436 lbs per ft correct?
Expert:  StructuralEng replied 10 months ago.

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.

Expert:  StructuralEng replied 10 months ago.

Do you have any other questions for me on this topic? If you could rate my answer, I would appreciate it.