|
RE: Rerounding effect
In NEN 3650-1:2020 the rerounding effect due to internal pressure is taken into account by multiplying the circumferential stress with frr, a factor < 1. See the equation in D.3.1 on page 187. So in case of hand calculations the factor frr can be set to 1. In Ple4Win the circumferential stresses due to all cross-sectional loadings including the internal pressure are calculated by means of a 6th order differential equation through Fourier series. So simply disabling the rerounding effect is not possible.
The rerounding results in a reduction of the circumferential stresses. If it is not allowed to include the rerounding in the calculations, a work-around would be to increase the circumferential stresses by multiplying with the value 1/frr. This can be done by a weighing factor for SFIORA in input table SWEIGH in DF6.2.
|
