In FOUNDATION Pro, I get extremely large foundations of my structure or have to enter a very high loading to satisfy the design of highly eccentric loading in the core. What can be the reason for this?

Answer

Please check the entry of loads in the '1.4 Loading' dialog box in the 'Characteristic Values' tab. 

A possible source of the error is that you have selected individual load cases for the design (that is, for example, self-weight, wind, and so on). Or these load cases are additionally set as 'Permanent'. See Figure 01.

Now, the program applies both load cases for the design of the first core width.
This is not correct. The design of the first core width only requires the application of the load from one permanent action.

For the design of the second core width, the load from a 'permanent and variable combination' is used. It means that you need either a load combination (CO) or a result combination (RC) for this. The entry of a load case (only wind here) is also wrong, since the favourably acting vertical component of the loading is missing. Therefore, you get too large foundations or have to enter a high loading as a 'permanent load' to meet the design.

So if you should create a CO for this situation, in which the 'permanent and variable actions' are together and apply these for the design in FOUNDATION Pro, pay attention to the assignment of this CO to a 'permanent + variable action'. See Figure 02.

Keywords

Foundation rotation Eccentric loading Core width Loading Variable action

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