Load Map Analysis

[lachinnur]

Hi everyone,

I'm designing a platform structure (size: 12 m × 27 m) with a specified load of 3 t/m². I understand this is a uniform load rating, but I’m unsure how to correctly apply it in analysis.

For example, if I calculate total load as:
3 t/m² × 12 m × 27 m = 972 t,
then divide by the total length of all members (let’s say 471 m), I get around 2.07 t/m, which doesn't seem reasonable.

It doesn't make sense to distribute the full area load across every member. A 3 t/m² load rating doesn't necessarily mean the entire platform will be fully loaded at once — especially since this is a telecom platform and will carry localized heavy equipment.

So my question is:
How should I approach the structural loading for this type of platform? Should I still use the full 3 t/m² as uniform across the platform, or is there a better, more realistic way to apply the load (e.g. equipment loads, local patches, load combinations)? I'm using STAAD.Pro.

If anyone has experience with similar designs, I’d appreciate your guidance. Thanks!

 

[HTURKAK]

I'm designing a platform structure (size: 12 m × 27 m) with a specified load of 3 t/m²

This is a huge load. Typical live loads for platforms ( Manufacturing Floors and Storage Areas=6.0 kN/m2, operating / access platforms=3.6 kN/m2 these figures from PIP STC01015 Structural Design Criteria).

I would suggest you to speak with equipment supplier for a limited area ( for assembly , service of the eq) which the 30 kN/m2 would be applied.
The use of 30 kN/m2 LL for the entire platform would be overkill.

 

[JStephen]

I would think with something that big and that heavy, you'd have definite attachment points, hold-down requirements, etc., not just a "set it over there somewhere" when the equipment arrives on site.
If your total load is correct, then you'd also be underdesigned for the actual spots where the loads are applied.