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What is the normal magnitude of the bearing capacity for a raft foundation?

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Question ajoutée par Mohamed Omar CHAIB , Civil Engineer , SAMSUNG C&T
Date de publication: 2015/06/05
Muhammad Sohail
par Muhammad Sohail , Principal Engineer , BUILDCON Consulting Engineers

Raft Founadtion is normally provided if bearing capacity of soil is less say0.75 Ton / sq. ft or less.

Utilisateur supprimé
par Utilisateur supprimé

In fact it depends on many factors that among them is the strength of soil beneath the foundation. This factors varies with the dimension of footing. The wider dimensions, the more magnitudes of bearing pressure. But, it should be considered that bigger dimensions create more weight which will reduce the amount of baring pressure. So, there must be a balance between foundation and soil resistance to acquire the best results.

محمد يونس
par محمد يونس , مهندس مشرف , الشركة العامة للكهرباء

Depends on :-

1-bearing capacity of soil

2- loads of columns

3-dimensions of columns

4- spacing between axes of columns 

Salem Al Maghrebi
par Salem Al Maghrebi , Engineer , Saudi Aramco

You must get the soil investigation (geotechnical) report for the foundation to answer this question.

Alex Al Yazouri
par Alex Al Yazouri , General Manager , Al Mushref Cooperative Society

I support the answer of Mr. Younes.

Syed Hyder
par Syed Hyder , Assistant Manager , Larsen & Toubro Ltd

There is no direct answer to this. If soil bearing capacity is sufficient then raft foundation could be provided, after all it is much cheaper than pile foundation.

Utilisateur supprimé
par Utilisateur supprimé

there is no normal magnitude of B.C., it comes with the soil properties and types (sandy, granular..)

abdul rahmaan syed
par abdul rahmaan syed , Structural Engineer , Sigma Metal Industries

The allowable bearing capacity (qa) is the maximum bearing stress that can be applied to the foundation such that it is safe against instability due to shear failure and the maximum tolerable settlement is not exceeded. The allowable bearing capacity is normally calculated from the ultimate bearing capacity using a factor of safety (Fs).

Srikanth Sriramoju
par Srikanth Sriramoju , Civil and Structural Engineer , ENI Iraq BV (Through SPIE Oil and Gas MIddle East Services, Abu Dhabi)

less than 150kPa for clayey soils.

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