Questions and discussion for this lecture live here. Fire away by hitting Reply below 
Sir, at timestamp 4:28 I notice for region A and region B the MI and MII were flipped. In region A ,MI moment belongs to the CDS BMD but in region B the MII belongs to CDS BMD. Why is that? I thought that MI should always belong to CDS and MII belong to EFS.
Or is it because when using the volume integral tables it’s more important to follow the shapes (i.e the triangle is high on the left)
Yes, your suggestion is correct - when evaluating the volume integrals, what’s important is that the shapes you select from the table match up with the BMD from your structure. At that point, because it’s a simple product (M1 x M2), it’s not critical which set of moments get labelled M1 and M2 - we’re guided by matching shapes.
That said, maintaining the ‘rule’ that M1 moments are part of the CDS and are generated from actual loads, whereas M2 moments are part of the EFS and come from virtual loads is a very helpful model to maintain when developing the solution, up to the point of evaluating volume integrals.
Seán
1 Like