equivalent masonry frame

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dariocoletta
Posts: 3
Joined: Wed Feb 17, 2021 1:55 am

equivalent masonry frame

Post by dariocoletta » Sat Mar 20, 2021 8:30 am

hi everybody,
i'm modelling an equivalent frame on opensees relative to a masonry structure but whena i launch the analysis i have this convergence problem:


OpenSees > source modello_3d.tcl
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 21032104(dW: << 6.98423e+017, dW0: 5.17332e+017)
Domain::update - domain failed in update
LoadControl::update - model failed to update for new dU
WARNING NewtonRaphson::solveCurrentStep() -the Integrator failed in update()
StaticAnalysis::analyze() - the Algorithm failed at iteration: 0 with domain at load factor 0.1
OpenSees > analyze failed, returned: -3 error flag
-3

do you have any idea on how to solve this problem?

thanks everyone in advance

mhscott
Posts: 586
Joined: Tue Jul 06, 2004 3:38 pm
Location: Corvallis, Oregon USA
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Re: equivalent masonry frame

Post by mhscott » Sat Mar 20, 2021 10:07 am

It's probably an error in your section definition. Not easy to tell without more context.

dariocoletta
Posts: 3
Joined: Wed Feb 17, 2021 1:55 am

Re: equivalent masonry frame

Post by dariocoletta » Sun Mar 21, 2021 2:24 am

this is my section:

uniaxialMaterial Concrete02 1 -4.000000 -0.001500 -0.800000 -0.010000 0.12 0.0 1500

section Fiber 101 { patch rect 1 26 3 -1300.000000 -150.000000 1300.000000 150.000000}
uniaxialMaterial Elastic 1001 1.755000e+19
uniaxialMaterial Elastic 1101 16250000000000
section Aggregator 1 1101 Vy 1101 Vz 1001 T -section 101

do you think that are there any problems?

selimgunay
Posts: 883
Joined: Mon Sep 09, 2013 8:50 pm
Location: University of California, Berkeley

Re: equivalent masonry frame

Post by selimgunay » Sun Mar 21, 2021 9:17 am

Are you getting this error in gravity analysis? It looks like gravity analysis as you are using load control

mhscott
Posts: 586
Joined: Tue Jul 06, 2004 3:38 pm
Location: Corvallis, Oregon USA
Contact:

Re: equivalent masonry frame

Post by mhscott » Sun Mar 21, 2021 4:45 pm

The E values for your Elastic materials are VERY large. You could be running in to numerical conditioning issues.

dariocoletta
Posts: 3
Joined: Wed Feb 17, 2021 1:55 am

Re: equivalent masonry frame

Post by dariocoletta » Mon Mar 22, 2021 12:17 am

yes, i get this error in gravity analysis

frasesreview
Posts: 1
Joined: Tue Mar 23, 2021 3:56 am

Re: equivalent masonry frame

Post by frasesreview » Tue Mar 23, 2021 4:03 am

Error in your section definition

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