Crane on Concrete Slab

Question:

trying to model crane loads on a concrete slab....the element loads are the crane crawlers ... I am getting a solution .... but results are not valid based on deflections .... can you show me how to do it with soil springs for a soil bearing pressure of 3 ksf?..... would really appreciate it ...owner wants to see it analyzed that way


Thanks




Answer:

Hi,


In order to evaluate deflections, the stiffness of soil is required rather than soil bearing pressure. The stiffness of soil is usually represented by the modulus of subgrade reaction, which can be calculated using the bearing capacity. Please refer to the article below.

Once the modulus of subgrade reaction is determined, you can assign point spring support using the 'Surface Spring Support' function.

Regards,
DK  
Creation date: 8/15/2018 8:52 PM (dklee@midasit.com)      Updated: 8/16/2018 6:23 AM (dklee@midasit.com)
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08-18-2018 BM Subgrade.mcb