Mat Foundation Weight
Mat Foundation Weight
(OP)
All:
Do you typically include the weight of your mat/raft foundation in calculating the ultimate bearing pressure values for designing your flexural/shear reinforcing?
For rafts that are 5-6' thick, it will cause significant additional pressures which doesn't really exist. The same would apply even for simple spread footings.
Appreciate your thoughts.
Do you typically include the weight of your mat/raft foundation in calculating the ultimate bearing pressure values for designing your flexural/shear reinforcing?
For rafts that are 5-6' thick, it will cause significant additional pressures which doesn't really exist. The same would apply even for simple spread footings.
Appreciate your thoughts.






RE: Mat Foundation Weight
RE: Mat Foundation Weight
RE: Mat Foundation Weight
RE: Mat Foundation Weight
you said:
"Do you typically include the weight of your mat/raft foundation in calculating the ultimate bearing pressure values for designing your flexural/shear reinforcing?"
Include the weight of the footing for gross soil bearing pressure, which should not exceed the allowable.
Design the footing itself for the net bearing pressure, which does not include the effect of the weight of the footing or soil above.
RE: Mat Foundation Weight
RE: Mat Foundation Weight
Concrete to soil wt. ratio is somewhere around 1.3-1.5
RE: Mat Foundation Weight
RE: Mat Foundation Weight
RE: Mat Foundation Weight
As an aside.... Ref- Suggested Analysis and design procedures for combined footings and mats, reported by ACI Committee 336: The pressure causing settlement in a mat analysis may be computed as
Net pressure = (Wt. of structure + Wt.of mat - Wt. of excavated soil(overburden) ) / Mat Area. The report clearly states that the overburden should be determined by the geotechnical engineer.