Perform crosssection calculations and NENchecks
General description:
Through this design function deformations and stresses are calculated in specified crosssections of the pipeline. Crosssections are located at the midsections of elements.
If the NEN 3650 norm option is selected in design function 1 (Project Setup) a dropdownlist becomes enabled which allows a selection between "Mohr", "Tresca", "Von Mises" and "Uniaxial". Stresses will be calculated according to the selected option. The unit stresses are the result of the calculated stresses divided by the applicable stress correction factor from NEN 3650 (see below) and the yield stress(es) of the pipe material defined in table ISTROP (design function 3.1). For detailed information see description of output data tables NENSMAX and NENSTRS.
Calculations according to Mohr, Tresca, Von Mises or Uniaxial are performed similar to design function 6.2, only the stress components are determined using standard weighing factors according to the NEN 3650 rules. Moreover maximum and detailed summated and principal stresses are provided in output tables TSTRMAX, TSTRESS, MSTRMAX and MSTRESS similar to design function 6.2 without application of any correction or weighing factor to make yield ellipse analysis possible.
Function description:
The function calculates the unit check stresses in specified crosssections and abs(max/min) results are stored in the output data table NENSMAX. One dataline per crosssection specified. Detailed data over the circumference of the crosssection are contained in the output data table NENSTRS. This table only contains results of the last crosssection calculated. At the start of a new crosssection the NENSTRS table is cleared and during the calculations on the new crosssection filled with the detailed data of that new section.
The calculated radial deformations of the crosssection(s) are similarly collected in output tables RMAXNEN and RDPLNEN. Moreover maximum and detailed summated and principal stresses are provided in output tables TSTRMAX, TSTRESS, MSTRMAX and MSTRESS to make yield ellipse analysis possible.
If detailed data are required from each crosssection to be analysed, it is advised to perform this subfunction separately for each crosssection using the unlockfunctionality of this subfunction.
Overall results of previous calculations are accumulated in the output data tables of this subfunction until this function is set back. In that case all output data tables are cleared.
Explanation of the check stresses Sp, Sv:pm and Sv

Sp : 
the hoop check stress is calculated according to NEN3650 Rules Stress correction factor is 1.1 (*) 
Sv:pm : 
the primary (membrane) stress due to primary loads. Only stress components with ..U.. identification are considered. The stress is reported if 1) there are only forceinduced loads specified and 2) the pipeline does not follow soil settlements at (pile) supports below ground or the pipeline lies on supports above ground. Stress correction factor is 1.0 (*) 

Sv : 
the primary + secondary (membrane + wall bending) stress due to primary and secondary loads. All stress components are considered. The stress is always reported. Stress correction factor is 0.647 if ReT=Re (*) (In input table ISTROP). 

(*) ref: 
NEN 36502:2012 appendix D.3.1 (and) table D.4. 
H6303, last changed: 14/09/2016
See also: