Frame member ITYPE=1

Hello,

I'm facing this issue with the yield Axial & Torque because i want to suppress it but i couldn't.

Here is one of my frame members.

INPUT:
25 FRAME B-80
1 0 0 0 25 1 0 0 1
3.53E+07 1.47E+07 0.135 0.002377 0.001139 0.0005065 0.1125 0.1125 0 0 0
0.225 0.225 0.225 0.225
0 0 0.0018 0.0018 ! Bi-factor (r) only for flexure
0.048 0.048 0.048 0.048 ! Hinge length
0 0 0 0 0 0 ! Interaction Parameter
222.52 -222.52 222.52 -222.52 ! My end-1
10.07 28.46 0.2 ! Strength Degradation
0.8 1.2 1.5 44.67 5.55E-04 44.67 5.55E-04 44.67 5.55E-04 44.67 5.55E-04 ! Hysteresis Takeda


OUTPUT
0SECTION NUMBER 25 TYPE=FRAME: B-80
=============================================================================
Member Type : Giberson 1-Component Yield Surface : Beam
Elastic Modulus . . . . = 3.530E+07 Shear Modulus . . . . . = 1.470E+07
Cross Sectional Area. . = 1.350E-01 Torsional Inertia . . . = 2.377E-03
Moment of Inertia Z axis= 1.139E-03 Moment of Inertia Y axis= 5.065E-04
Shear Area. . . . Z axis= 1.125E-01 Shear Area. . . . Y axis= 1.125E-01
Shear-centre Ecc. Y axis= 0.000E+00 Shear-centre Ecc. Z axis= 0.000E+00
Weight/(Unit Length). . = 0.000E+00
Perfect Hinge Z at End 1= NO Perfect Hinge Z at End 2= NO
Perfect Hinge Y at End 1= NO Perfect Hinge Y at End 2= NO
Flexural Stiffness varies with Yield Moment
Base Stiffness at zero AXial Force
End-block Length Z End 1= 2.250E-01 End-block Length Z End 2= 2.250E-01
End-block Length Y End 1= 2.250E-01 End-block Length Y End 2= 2.250E-01
Joint Flexibilty Z End 1= 0.000E+00 Joint Flexibilty Z End 2= 0.000E+00
Joint Flexibilty Y End 1= 0.000E+00 Joint Flexibilty Y End 2= 0.000E+00
Bi-linear r Axial . . . = 0.000E+00 Bi-linear r Torsion . . = 0.000E+00
Bi-linear r Flexure Z . = 1.853E-03 Bi-linear r Flexure Y . = 1.853E-03
Hinge Length Z at End 1= 4.891E-02 Hinge Length Z at End 2= 4.891E-02
Hinge Length Y at End 1= 4.891E-02 Hinge Length Y at End 2= 4.891E-02
Beam Axial Force Moment Interaction
Tension Yield Force . . = 2.225E+02 Compression Yield Force =-2.225E+02
Positive Yield Torque . = 2.225E+02 Negative Yield Torque . =-2.225E+02
Yield Moment Z+ve End 1 = 2.225E+02 Yield Moment Z-ve End 1 =-2.225E+02
Yield Moment Y+ve End 1 = 2.225E+02 Yield Moment Y-ve End 1 =-2.225E+02
Yield Moment Z+ve End 2 = 0.000E+00 Yield Moment Z-ve End 2 = 0.000E+00
Yield Moment Y+ve End 2 = 0.000E+00 Yield Moment Y-ve End 2 = 0.000E+00
Moment Interaction Alpha= 0.000 No Z-Y Interaction

DEGRADING STRENGTH with Ductility - each direction
Start Degrade Ductility = 10.07 Final Degrade Ductility = 28.46
Final Strength Factor . = 0.2000 1% Strength at Ductility= 0.0000

TAKEDA-Slip Hysteresis
ALFA Unloading Factor. = 0.8000 BETA1 Slipping Factor . = 1.2000
BETA2 Re-loading Factor = 1.5000
Cr-Action . Flexure-Z @1= 4.467E+01 Cr-Deform . Flexure-Z @1=-5.550E-04
Cr-Action . Flexure-Z @2= 4.467E+01 Cr-Deform . Flexure-Z @2=-5.550E-04
Cr-Action . Flexure-Y @1= 4.467E+01 Cr-Deform . Flexure-Y @1=-5.550E-04
Cr-Action . Flexure-Y @2= 4.467E+01 Cr-Deform . Flexure-Y @2=-5.550E-04


As you can see from above, once i suppress torque and axial, yield moment at end 2 is suppressed too! and yield moment values goes to the axial and torque.

Thanks!

You have a strange line of data, labeled "Interaction parameters" which should not be there, the system is reading that line of zeros as the yield moments etc and as they are all zero it will later reset the member to elastic.

First thanks for your reply, Prof.Carr,

This line because i want to consider moment interaction later (alfa). But, when this "interaction parameter' line is deleted an error would appear.

***ERROR*** Subroutine INPUT3 - Section Out of Order-Number= 26
***ERROR*** Subroutine INPUT3 - Property Table Data
***ERROR*** Abnormal Program Termination

Thanks.