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Foundation loads

 
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arjun7
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Joined: 13 Nov 2017
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PostPosted: Mon Nov 13, 2017 9:12 am    Post subject: Foundation loads Reply with quote

I'm designing a skid structure in staad. Generally anchor bolts will be used to fix the structure to foundation. Pinned supports shall be assumed at those anchor points & foundation load table will be provided based upon the reactions (Fx,Fy & Fz) coming at such points. But in this current project the skid will be placed (rested) on the foundation without any anchor bolts. (Skid is in Indoor only).

Can someone please help me... how shall i assume support for such a condition & provide reactions for foundation loads ?
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mallesh_ng
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Joined: 27 Dec 2013
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Location: BENGALURU

PostPosted: Mon Nov 13, 2017 2:03 pm    Post subject: skid on foundation Reply with quote

Dear Arjun,
If the equipment sitting on the skid then you have to consider UDL load on the skid line

And even if the skid is Anchored with foundation bolts then also you have to consider UDL as above & additionally create another model and check for bolt tension for earthquake load


Regards
Mallesh N G
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arjun7
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PostPosted: Tue Nov 14, 2017 4:20 am    Post subject: Reply with quote

Thanks for your reply to my question. But still now i'm not clear about my query.I shall attach the picture. Hope u'll better understand my question.Now in my current project skid will be placed upon the foundation without any anchor bolts.


Skid frame 3D.PNG
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Skid frame 3D.PNG


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mallesh_ng
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PostPosted: Tue Nov 14, 2017 10:06 am    Post subject: Block foundation Reply with quote

Its seems the entire equipment will be sitting on single foundation, In this case you can check for eccentricity of foundation wrt to CG of the equipment.Make sure eccentricity will not be more than 5% & arrive at the foundation length and breadth

Use rigid links to transfer load of equipment to mat in staad pro

& also check for base pressure,

Since the equipment are distributed over the mat no need to check for overturning.

if most of the equipment are rotating type then to avoid resonance you can keep weight of the foundation to be more than 2.5 times the weight of equipment.(To be on safer side)

Check the  thickness &  reinforcement  of raft as per staad forces but try to provide 25kg/m3.

Its my suggestions hope experts can suggest better answers

Regards
Mallesh
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arjun7
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PostPosted: Wed Nov 15, 2017 5:50 am    Post subject: Reply with quote

Use rigid links to transfer load of equipment to mat in staad pro


I'm now using elastic mat foundation support in the design & receiving Max base pressure as 29 Kn/m2. Is it an appropriate value to provide to the client to design foundation ?


(Subgrade modulus value = 12000 Kn/m2/m considered assuming soil bearing capacity as 100 Kn/m2).






Elastic mat.PNG
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