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Problems with shear checks

TonyC 2016-07-05 10:41:08

I'm opening this thread to share a technical support case.

I often happen to have very short span reinforced concrete elements that can’t be verified under shear. Is there a way of solving this?

An unsatisfied shear check, especially if due to excessive compression of the connecting rod of concrete, may depend on the checks carried out in accordance with the capacity design mechanism. For these elements (usually with a short span length) you can change the way the shear check is carried out resorting to the Exceptions view.

To apply an exception to a structural element, just proceed with the following:
• activate the Exception view in 3D view;
• choose the type of structural element (beam or column) to which to apply the exception;
• click on the element on which to apply the exception;
• click on the yellow circle that encloses the + sign;
• in the dialog box that opens select the exception box to apply to the element (in this case Capacity Design check Shear/Bending) and then press confirm to close the dialog and apply the exception to the selected element.

In the properties of the inserted exception you can choose between the following two criteria:
from stresses: the shear check is carried out with the stresses deriving from the analysis (with reduced spectrum);
from ultimate moments with maximum from q=1: shear check is carried out using the stresses deriving from an elastic spectrum analysis. (q=1).

The second criterion, however, is in accordance with the Capacity Design principles as it takes into account the over sizing of shear in relation to the bending force.

Click the link below to see how to enter exceptions: