This suite of spreadsheets undertake the stability analysis and structural design of continuous foundations loaded by either columns or walls.
These spreadsheets analyse a user defined continuous foundation with either a single linear axial load (wall) or up to 16 loading points and calculate the bearing pressures transferred into the soil. This can be done through either a Rigid or a Flexible analysis of the foundation. This allows the designer to optimise the foundation dimensions to suit the loading arrangements and the maximum bearing capacity of the underlying soils.
After the foundation dimensions have been set, the spreadsheets then calculate the design bending moments and the required reinforcement in both X and Y directions, and for both sagging and hogging moments. This can be done with either a Rigid or Flexible analysis depending on the stiffness of the proposed foundation. The designer can then specify the precise reinforcement arrangement using our unique Suggested Reinforcement Chart which shows graphically the available reinforcement arrangements which satisfy both required cross sectional area and spacing requirements.
Then the spreadsheets calculate the shear capacity of the foundation in both X and Y directions and for punching shear and checks whether the pad is adequately deep.
Then a summary page is created allowing the designer to quickly check the validity of the whole design.
The suite includes a total of 6 spreadsheets;
- A continuous foundation supporting a central wall load.
- A Rigid continuous foundation supporting up to 16 columns design spreadsheet which analyses a continuous foundation assumed to be Rigid. This is suitable for deep, small, heavily reinforced or lightly loaded continuous foundations which can be considered to behave Rigidly.
- A Flexible continuous foundation supporting up to 16 columns design spreadsheet which analyses a continuous foundation assumed to be Flexible using a Winkler foundation type analysis. This is suitable for thin, long or heavily loaded continuous foundations which can be considered to behave Flexibly.
Wall supporting, Rigid and Flexible spreadsheets are available to comply with either British Standards BS8110 & BS8004 or Eurocodes BS En 1992 & BS En 1997.