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Sliding check for an isolated foundation of a column within a building/structure

 
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eswar_reddy
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Joined: 01 Jul 2020
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PostPosted: Thu Sep 17, 2020 11:28 am    Post subject: Sliding check for an isolated foundation of a column within a building/structure Reply with quote

Hi SEFIANS,


I need a clarification on, whether the sliding check of any non-eccentric isolated foundation would be critical at any point of time. Provided, the building/structure is constructed by all Moment Resistant Frames.

My statement is like this. 'If an individual foundation had to slide due to some lateral force, then it has to push all the columns/foundations simultaneously, as all columns are interconnected. So, one has to perform the sliding check considering the complete lateral force on the building & total contact area of all foundations'.

Correct me if i was wrong.
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venkatasalamkl
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Joined: 27 Oct 2017
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PostPosted: Fri Sep 18, 2020 1:30 pm    Post subject: Sliding check for an isolated foundation of a column within a building/structure Reply with quote

Hello Eswar,

From my understanding sliding checks to be done for individual footing.


Reason: Consider that you are checking individual footing and found that few footings fail in sliding checks. Then it indicates that as soon as the failure load is attained, those footings will no more take lateral loads. This confirms that whatever lateral load applied after the failure of the footing should be taken by adjacent columns/footings to maintain equilibrium.


Your statement indirectly implies that while designing multiple shear walls in a building, the shear load to be checked against overall shear capacity. i.e. Total shear load upon the shear capacity of all walls (Not Individual walls). If you do so it is absolutely wrong. Similar concept applies to sliding checks in footings.


Thanks,
VenkatVenkatasalam, Aff.M.ASCE
M.E (Civil with specialization in Structural Engineering)
BITS Pilani, Hyderabad Campus.  
M.+91.8015515182
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