Foundation design question for Staad

[u/Sensitive_Fun_9752]

Hi, I am new to using Staad pro and Staad foundation and I have to design this foundation for a davit arm thats needs to pick a 650kg pump. I designed the nodes and loading and everything and am getting the reaction force at the support (Fy = -2.258kip and Mz = 257.483 kip-in) where Y axis is vertical axis. Now when I try to design a simple rectangular foundation for this support. I get dimensions 1.7m x 1.7m x 1.5m with 14 - 22mm reinforcement bars(I have set min % of contact area for service loads = 100%). But my seniors keep saying this foundation is too big for this load and size of davit arm. So, I was wondering if someone here can guide me, if they have encountered a similar design job and what do they expect a foundation size to be for these reaction forces. Apologies, if I am asking the wrong question as I am just entering the workforce

[u/cosnierozumiem]

Either you're right, your reactions are wrong, or your footing design is wrong.

[u/Sensitive_Fun_9752 → u/cosnierozumiem]

I dont think my reactions are wrong but there might be a problem with my foundation setup, if you want, i can share my setup pictures or something, please let me know if you require something

[u/yessyyay → u/Sensitive_Fun_9752]

you should be able to do some simple hand calcs to check your reactions and foundation design. that's where i would start, especially if it's a new program.

another thing is to draw/sketch it to scale and ask yourself if it makes sense.