Calculation carport, HEB 220

[jofa08]

Hi,

I have a carport project underway and have done some calculations, but need to verify that I've got it right.

I'm thinking of a carport (3 cars +) with a free-standing structure so there is no beam at the front to drive into. I will be using self-supporting tp 128 as the roof and HEB 220 as the planned bearing beam. Then I will build some side + back walls which will also secure the structure, but they are not included in the drawing.

Now to my concern, will it hold?

I've calculated a HEB 220 (8000mm) and it results in about 40mm deflection (based on snow load zone 3.5 + some margin and self-weight of the beam). I won't be building a gate or similar and therefore consider that 40mm is OK, even though it is more than it should be.



/Johan.

My calculations:

Deflection: 5 QL³ / 384 EI

5 x 105,600 x 512000000000 / 384 x 210,000 x 80910000 = 41.4mm

Based on:
Snow load zone 3.5 = 350kg/square meter, 8m x 7m (there will be a little overhang at the back/front) = 56 square meters, 350x56 = 19600kg approximately 20,000kg.

Per beam about 10,000kg + 71.5kg/m = 10,560

Q = 105,600N distributed load per beam
L = 8000mm
E = 210,000
I for HEB 220 = 80910000

Grateful for any qualified responses, especially from someone who can do the math! It's been a while since mechanical engineering high school.