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Base plate design (CSA-S16): A_req calculated but not checked against area provided

Tekla Tedds plate design CSA-S16 required provided checked
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Problem

Area of steel required for base plate is calculated, but is not compared to Area of steel provided. In the attached example Areq = 226244 mm2 and the area of the base plate is only 202500mm2 but Tedds does not return a fail.

Solution

The calculation of A_req is only there to determine whether or not the column is lightly or normally loaded i.e. to determine whether t_req1 or t_req2 is to be adopted for the plate thickness. The actual check on the concrete bearing strength (and hence the size of the base plate) is contained in the section titled 'Design bearing strength'. This allows for an amplification of the allowable bearing stress based on sqrt(A2/A1) thereby sometimes allowing a pass even if A_req is more than C1 x B.

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