Large opening pressure area method
Thread Content
In HG20582-1998, the calculation for large openings uses the pressure area method; it allows for a plastic deformation of up to 1% in the areas where the highest stresses occur during pressure testing. Therefore, when using this method for design, it is necessary to ensure that five specific conditions are met. These five conditions are listed in the document, so they will not be repeated here. I have a question: After looking at these five conditions, I can’t understand how they are related to the fact that plastic deformation of up to 1% can occur in the areas with the highest stresses. Could someone please explain this in detail? Thank you
An explanation is provided in the preparation notes for this standard
The large opening reinforcement was developed with reference to the West German AD code. The AD code adopts a limit design method involving pressure testing for the reinforcement of large openings, and 1% plastic deformation is one of the limit design criteria.