1. Data Group B: Output from STAMOD

Description of result presentation from static analyses is given in the following.

1.1. Results from static fixed parameter analysis

Displacement and force data from static fixed parameter analysis are established by the STAMOD module and stored on file IFNSTA.

Specifying this output after a parameter variation run will produce the results of the last parameter variation step.

1.1.1. Static dimension information

If you want dimension parameters, such as no of load steps, no of nodes etc, to be printed, give

STATic DIMENsion PARAmeters         NoPlot

1.1.2. System information

If you want information about the connection between the local line, segment and element number given as input to INPMOD and the global FEM element/nodal numbers generated by STAMOD, give

STATic SYSTem INFOrmation       NoPlot

A more detailed description is given on the STAMOD print file.

1.1.3. Coordinates of final static configuration

Data group identifier, one input line
STATic COORdinates      Plot
Print options, one input line
ICONF LINE-ID IPROJ
  • CONF: integer: Configuration switch

    • ICONF=1: Initial configuration (catenary configuration)

    • ICONF=2: Final configuration (Results from FEM or CATFEM analysis)

  • LINE-ID: character(8): Line identifier for which coordinates are wanted. You may specify ALL to include all lines in the system.

    • Note that specifying a specific line gives a 2D-plot, while specifying ALL gives a 3D-plot

    • LINE-ID=0: Plot of 2D geometry of all lines

  • IPROJ: integer: Projection code

    • dummy if LINE-ID=ALL

    • IPROJ=1: Output of x-y coordinates

    • IPROJ=2: Output of x-z coordinates

    • IPROJ=3: Output of y-z coordinates

1.1.4. Axial forces from catenary analysis

Note that no moments are included in the catenary analysis.

Data group identifier, one input line
INITial AXIAl FORCe         Plot
Line specification, one input line
LINE-ID
  • LINE-ID: character(8): Line identifier for which forces are wanted. You may specify ALL to include all lines in the system

1.1.5. Forces from static fixed parameter analysis

Forces are printed as force, bending and torsional moments.

Data group identifier, one input line
FINAl STATic FORCes         Plot
um io fig300
Figure 1. Pipe wall force calculation

Pipe wall force, axial:

\(\mathrm {T_W=T_e+p_iA_i-p_eA_e[+m_iv_i^2]}\)

(In cases with high pressure(s) it may be important to include the radial stress when material strain is to be evaluated)

This is identical with the flange force in case of a double seal (at \(\mathrm {r=ri}\) and \(\mathrm {r=re}\))

  1. \(\mathrm {T_F=T_W}\)

In the case of an inner seal only:

  1. \(\mathrm {T_F=T_e+p_iA_i-p_eA_i[+m_iv_i^2]}\)

Any other sealing radius:

  1. \(\mathrm {T_F=T_e+(p_i-p_e)A_s[+m_iv_i^2]}\)

Where: - \(\mathrm {A_s=\pi r_s^2}\) - \(\mathrm {r_s=}\) sealing radius

rs = sealing radius

\(\mathrm {m_iv_i^2}\) is an additional term for cases with internal fluid flow.

Print options, one input line
LINE-ID IDOF1 IDOF2 IDOF3 IDOF4
  • LINE-ID: character(8): Line identifier for which forces are wanted. You may specify ALL to include all lines in the system.

  • IDOF1: integer: Degree of freedom for first figure

    • IDOF1=0: Not included

    • IDOF1=1: Axial force

    • IDOF1=2: Torsional moment

    • IDOF1=3: Bending moment about local y-axis

    • IDOF1=4: Bending moment about local z-axis

    • IDOF1=5: Pipe wall force, incl hydrostatic pressures

    • IDOF1=6: Shear force in local y-direction

    • IDOF1=7: Shear force in local z-direction

  • IDOF2: integer: Degree of freedom for second figure

    • Interpretation as for IDOF1

  • IDOF3: integer: Degree of freedom for third figure

    • Interpretation as for IDOF1

  • IDOF4: integer: Degree of freedom for fourth figure

    • Interpretation as for IDOF1

No of figures in one plot may vary from 1-3 depending on the number of response quantities specified (e.g. IDOFi).

Note that the print part of this option always will produce results for all stored degrees of freedom, i.e. axial force, torsional moment and bending moments about local y- and z-axes. The parameters are used to specify the dof’s to be plotted.

1.1.6. Stress from static analysis

Data group identifier, one input line
FINAl STATic STREsses       Plot
Output options, one input line
LINE-ID IDOF
  • LINE-ID: character(8): Line identifier for which stresses are wanted. You may specify ALL to include all lines in the system.

  • The following parameter is used to specify the dof to be considered

    • IDOF: integer: Stress component

      • IDOF=1: Axial stress

      • IDOF=2: Torsional stress

      • IDOF=3: Bending stress

      • IDOF=4: Axial + bending stress

      • IDOF=5: Shear stress

      • IDOF=6: Shear + torsional stress

      • IDOF=7: Equivalent stress

      • IDOF=8: Hoop stress

      • IDOF=9: Radial stress

Effect of internal/external pressure and fluid velocity are included

Specification of point for stress calculation, one input line
IMAX THETA INEX
  • IMAX: integer, default: 1: Stress location option

    • IMAX=1: Maximum stresses in cross section estimated

    • IMAX=0: Stresses calculated at location specified by THETA and INEX

  • THETA: real, default: 0: Angle (in degrees) from local y-axis for stress calculation.

    • Dummy for IMAX=1

  • INEX: integer, default: 2: Location code

    • Dummy for IMAX=1

    • INEX=1: Inner wall

    • INEX=2: Outer wall

For IMAX=1, the maximum stresses of type IDOF in the cross section are estimated. The equivalent stress (von Mises) is supposed to be maximum where the bending stress is maximum or minimum.

1.2. Output from static parameter variation analysis

Displacement and force data from static parameter variation analysis are established by the STAMOD module and stored on file IFNSTA. Result presentation from static parameter variation analysis is described in the following.

1.2.1. System geometry from parameter variation analysis

Data group identifier, one input line
PARAmeter VARIation COORdinates         Plot
Line specification, one input line
LINE-ID IOTYP IPV1 NVP
  • LINE-ID: character(8): Line number for which geometry are wanted. You may specify ALL to include all lines in the system.

    • ALL gives a 3D plot of all lines.

    • LINE-ID = 0 gives a 2D plot of all lines

  • IOTYP: integer: Degree of freedom specification

    • Dummy if ILINE = ALL

    • IOTYP=1: x-y coordinates

    • IOTYP=2: x-z coordinates

    • IOTYP=3: y-z coordinates

  • IPV1: integer: First parameter variation step to be included

  • NVP: integer: No of parameter variation steps to be included

The first plot to appear will be for step no NSTEP+IPV1 where NSTEP is total number of load steps used in the static analysis with fixed parameters.

Negative value of IPV1 is possible, which allows for plotting of static configuration at all load steps in static analysis with fixed parameters.

It is also possible to plot static configurations from 1st load step to last successful solution when static analysis fails, which can be very useful for detection of possible instability problems.

1.2.2. Displacement of selected nodes from parameters variation analysis

Data group identifier, one input line.
PARAmeter VARIation DISPlacements       Plot
Output code, one input line
IPV1 NPV IDOF1 IDOF2 IDOF3 NNODC
  • IPV1: integer: First parameter variation step to be included

  • NPV: integer: No of parameter load steps to be included. (A large number includes the remaining steps)

  • IDOF1: integer:

    • IDOF1=1: Translation in x-direction

    • IDOF1=2: Translation in y-direction

    • IDOF1=3: Translation in z-direction

  • IDOF2: integer:

    • Interpretation as for IDOF1

  • IDOF3: integer:

    • Interpretation as for IDOF1

  • NNODC: integer: No. of input lines used for node specification

No of figures on each plot may vary from 1 to 3, depending on IDOFi

The first plot to appear will be for step no NSTEP+IPV1 where NSTEP is the total number of load steps in the static analysis with fixed parameters.

Negative value of IPV1 is allowed (see System geometry from parameter variation analysis).).

Node specification, NNODC input lines
LINE-ID ISEG INODE
  • LINE-ID: character(8): Line identifier.

    • You may specify ALL to include all lines

  • ISEG: integer/character: Segment number.

    • You may specify ALL to include all segments.

    • ENDS includes the end segments on the line

  • INODE: integer/character: Node number.

    • ALL includes all nodes

    • ENDS includes end nodes on the above specified segment

1.2.3. Forces on selected elements from parameter variation analysis

Data group identifier, one input line
PARAmeter VARIation FORCes      Plot
Output options, one input line
IPV1 NPV IDOF1 IDOF2 IDOF3 NNELC
  • IPV1: integer: First parameter variation step to be included

  • NPV: integer: No of parameter load steps to be included. (A large number includes the remaining steps)

  • IDOF1: integer: Degree of freedom specification for Figure 1

    • IDOF1=0: No output

    • IDOF1=1: Axial force

    • IDOF1=2: Torsional moment

    • IDOF1=3: Bending moment about local y-axis

    • IDOF1=4: Bending moment about local z-axis

  • IDOF2: integer:

    • Interpretation as for IDOF1

  • IDOF3: integer:

    • Interpretation as for IDOF1

  • NNELC: integer: No. of input lines used for element specification

The first plot to appear will be for step no NSTEP+IPV1 where NSTEP is the total number of load steps used in the static analysis with fixed parameters.

Negative value of IPV1 is allowed (see System geometry from parameter variation analysis).

No of figures in one plot may vary from 1 to 3, depending on the number of response quantities specified (e.g. IDOFi).

Element specification, NNELC input lines
LINE-ID ISEG IELM
  • LINE-ID: character(8): Line identifier.

    • You may specify ALL to include all lines

  • ISEG: integer/character: Segment number.

    • You may specify ALL to include all segments.

    • ENDS includes the end segments on the line

  • IELM: integer/character: Element number.

    • ALL includes all elements

    • ENDS includes end elements on the above specified segment