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walkereng
walkereng, Consultant
Category: Structural Engineering
Satisfied Customers: 2375
Experience:  Over 30 years of Structural Engineering experience.
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I am building an underground shelter and roof I have 9 - 24

Customer Question

Hi...I am building an underground shelter and for the roof I have 9 - 24 foot w12x30 beams sitting on 3-24 foot - w12x20 beams all in upright position. One down each end and one in the middle. I have 5 upright support beams of 10 inch heavy w-beams ( not sure of size but heavy flange and webs) supporting each of the 3 beams.. The 2 end support beams are set in one foot from the upper 9 making a span of 22 feet total and 11 to the middle support. The top beams are on 33 1/4" centers. I am concerned with the weight on the three with the legs and I am considering welding in some support pieces between the two flanges to strengthen the vertical position of those three beams. I will be using railroad tie decking on top and covering with dirt. My question is how much weight per sq. foot will the structure support. I will have to figure the rail ties total weight and the dirt. But need to know about how much it will support per sq. foot
Thanks
Gary.
Submitted: 11 months ago.
Category: Structural Engineering
Expert:  walkereng replied 11 months ago.

Do you have any drawings or sketches you can share with me?

Expert:  walkereng replied 11 months ago.

Let me know when you come back online

Customer: replied 11 months ago.
Hi....sorry I'm at work and had to go take care of something. I will e-mail you a picture I have of early stage into the build but should help you see what I'm doing.
Customer: replied 11 months ago.
This was early in the build so not all the beams are in place. I added one more support beam down the middle with 4 legs and added 3 legs to the outer support beams. Also there are a total of 9 on top now. Hope this helps.Hope this works.
Customer: replied 11 months ago.
Also if possible I would like my pics and our conversation kept private.
Customer: replied 11 months ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Expert:  walkereng replied 11 months ago.

This forum is not private.

I made a sketch, see attached and let me know if I have it right and can you supply the dimensions that I have ? on

Customer: replied 11 months ago.
Hi....I made a mistake, the 3 beams under the 9 beams are also w12x30's. Also I now have 5 legs under the out side beams equally spaced, and 4 legs under the middle beam equally spaced. The dimensions with the question marks are as follows...1 foot..11feet..11feet..1 foot.
Customer: replied 11 months ago.
Don't need you to call me. That was done in error.
Expert:  walkereng replied 11 months ago.

That is OK

Can you tell me the depth of soil you will have on top of your railroad ties? If I know this, I can check the capacity of your system.

Also, do you know if your steel beams are 36 ksi steel or 50 ksi steel?

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