Non linear analysis
Non linear analysis
(OP)
Hi!
I'm just trying to perform a non linear analysis with Gt Strudl, namely taking into account geometric non linearities.
Previously I did a response spectrum analysis and I transformed the results in a Pseudo static loads. After I combine these Pseudo static loads with other static loads by means of the command FORM LOAD. When I tried to perform the non linear analysis, the results miss the seismic part (the contribution to the final internal actions coming from the seismic loads is zero). It's like either the FORM LOAD command can't consider Pseudo static loads or the non linear analysis can't work with Pseudo Static Loads.
I'll write here a piece of the program:
PERFORM RESPONSE SPECTRUM ANALYSIS
COMPUTE RESPONSE SPECTRUM DISPLACEMENTS ACCELERATIONS FORCES REACTIONS MODE COMBINATION CQC
CREATE PSEUDO STATIC LOAD 'Ed_X' FROM CQC OF LOAD 'LEd_X'
CREATE PSEUDO STATIC LOAD 'Ed_Y' FROM CQC OF LOAD 'LEd_Y'
CREATE PSEUDO STATIC LOAD 'Ed_Z' FROM CQC OF LOAD 'LEd_Z'
FORM LOAD 'C1' FROM 'G' 1.0 'Q' 0.5 'Ed_X' 1.0 'Ed_Y' 0.3 'Ed_Z' 0.3
FORM LOAD 'C2' FROM 'G' 1.0 'Q' 0.5 'Ed_X' 1.0 'Ed_Y' 0.3 'Ed_Z' -0.3
FORM LOAD 'C3' FROM 'G' 1.0 'Q' 0.5 'Ed_X' 1.0 'Ed_Y' -0.3 'Ed_Z' 0.3
NONLINEAR EFFECTS
GEOMETRY ALL MEMBERS
MAXIMUM NUMBER OF ITERATIONS 10
NONLINEAR ANALYSIS
Here you are.. Please help me! Thankyou!
I'm just trying to perform a non linear analysis with Gt Strudl, namely taking into account geometric non linearities.
Previously I did a response spectrum analysis and I transformed the results in a Pseudo static loads. After I combine these Pseudo static loads with other static loads by means of the command FORM LOAD. When I tried to perform the non linear analysis, the results miss the seismic part (the contribution to the final internal actions coming from the seismic loads is zero). It's like either the FORM LOAD command can't consider Pseudo static loads or the non linear analysis can't work with Pseudo Static Loads.
I'll write here a piece of the program:
PERFORM RESPONSE SPECTRUM ANALYSIS
COMPUTE RESPONSE SPECTRUM DISPLACEMENTS ACCELERATIONS FORCES REACTIONS MODE COMBINATION CQC
CREATE PSEUDO STATIC LOAD 'Ed_X' FROM CQC OF LOAD 'LEd_X'
CREATE PSEUDO STATIC LOAD 'Ed_Y' FROM CQC OF LOAD 'LEd_Y'
CREATE PSEUDO STATIC LOAD 'Ed_Z' FROM CQC OF LOAD 'LEd_Z'
FORM LOAD 'C1' FROM 'G' 1.0 'Q' 0.5 'Ed_X' 1.0 'Ed_Y' 0.3 'Ed_Z' 0.3
FORM LOAD 'C2' FROM 'G' 1.0 'Q' 0.5 'Ed_X' 1.0 'Ed_Y' 0.3 'Ed_Z' -0.3
FORM LOAD 'C3' FROM 'G' 1.0 'Q' 0.5 'Ed_X' 1.0 'Ed_Y' -0.3 'Ed_Z' 0.3
NONLINEAR EFFECTS
GEOMETRY ALL MEMBERS
MAXIMUM NUMBER OF ITERATIONS 10
NONLINEAR ANALYSIS
Here you are.. Please help me! Thankyou!
RE: Non linear analysis
Load List 'C1' 'C2' 'C3'
then you do the NLA command. You can also use Load List All, but that will cause some extra analysis time.
If that does not solve your problem, and you have paid for support, you can contact Intergraph Tech Support and get one of the real experts to find your problem.
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