CSI SAFE - 19b Mat or Raft Foundation Uplift Check
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- Опубликовано: 20 окт 2024
- RAFT or MAT FOUNDATIONS. A raft foundation, also called a mat foundation, is essentially a continuous slab resting on the soil that extends over the entire footprint of the building, thereby supporting the building and transferring its weight to the ground. ... This reduces the stress on the soil.
A Raft foundation is often used when the soil is weak, as it distributes the weight of the building over the entire area of the building, and not over smaller zones (like individual footings) or at individual points (like pile foundations). This reduces the stress on the soil.
HOW TO CONSTRUCT A RAFT OR MAT FOUNDATION
A raft foundation is constructed by first excavating the ground to a uniform, flat level.
Then, a waterproof plastic sheet is laid over the earth, and a thin 3" layer of plain cement concrete (PCC) is poured just to create a perfectly flat and level base for the foundation.
After this, a waterproofing layer is installed, and then reinforcement steel for the raft slab is tied in place. After all the steel has been put in place, concrete is poured to the desired thickness, which is usually in the range of 300 mm (12") to 600 mm (24") thick for small buildings: this can be much thicker if heavy loads are to be carried.
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what is the combination for uplift check as per ACI 318-08 code ? please share all the combinations with reference
Very nice video.. I want to when to conduct this uplift check on mat foundation?? Is it related to the ground water table?
Yes... And.. also for horizontal force
Sir please explain why you selected nonlinear analysis type for uplift calculation, why you didn't select linear analysis type? Thanks.
Thank you for the videos, they are really helpful !!! How could I consider in the uplift case the water table pressure coming from below? Could I just add a load pattern with negative pressure on the surface of the MAT, and insert a load case for non-linear (allow uplift) with 0.9DL+1WaterPressure???
Water pressure will be =unit weight of water x height of water table.... Which will be submerged....
Apply as -ve.... In combination
Dear sir
Nonlinear analysis should be performed with respect to the lateral force like seismic force, but you don’t add EQ force & aslo load combinations.
Yes
You can
How to check punching in safe when coloumn takes stiff property
When you select the center point and go to assign loads...... then after putting the values you have to must put DIMENSIONS OF COLUMN (The option punching shear area is present )..... after then you can see PUNCHING SHEAR RESULTS.
@@civilmdc thanks sir if u make video on punching check in footing it better to understand and sir can make u how to anslyse finite element method
I want a video of piled raft from your end.
See the lecture in the video of pile foundation design
Here is the full course link on CSI SAFE
ruclips.net/p/PL0h14oMuZXQ6l-O7aqF0hYsZbyJ7eFt1H
@@civilmdc I have seen all the videos. Design of pile cap is beautifully illustrated. But I don’t find raft on pile foundation.