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mhscott wrote: ↑Wed Oct 26, 2022 6:02 am Apply simple loadings on a cantilever with elastic materials in order to figure out what each column represents.

Dear Professor, I made a simple test with elastic element of elastic material, but there was no output result. With fiber section, it is the same as mine. Is there any other method？

dear,
I use the " recorder Element - the file $dataDir/ElementDeformation49. Out 49 section 1 - ele deformation " to output section deformation, why there are four column data? What do they stand for?

Please help me.

Hi guys.
Why does the section moment—curvature analysis program on the OpenSEES official website fail to run？
When I run it, I get the following ：
#####################################
Estimated yield curvature: 0.000126984126984127
invalid command name "MomentCurvature"
while executing
"MomentCurvature 1 $P [expr $Ky*$mu] $numIncr"
(file "curve-moment.tcl" line 73)

######################################

What is problem? Thanks you for your help.

mhscott wrote: ↑Wed Sep 21, 2022 6:39 am https://portwooddigital.com/2021/11/22/cable-analysis/

Thanks a lot, this is very inspiring for me

dear :
When I analyzed the seismic response of the cable-stayed bridge, the following results appeared.
####################################################
WARNING BandGenLinLapackSolver::solve() -factorization failed, matrix singular U(i,i) = 0, i= 106
WARNING NewtonRaphson::solveCurrentStep() -the LinearSysOfEqn failed in solve()
StaticAnalysis::analyze() - the Algorithm failed at iteration: 0 with domain at load factor 0.1
OpenSees > analyze failed, returned: -3 error flag
static over
ArpackSolver::Error with _saupd info = -1
N must be positive.
WARNING DirectIntegrationAnalysis::eigen() - EigenSOE failed in solve()
T1 = Inf s
T2 = 6.283185307179586 s
DynamicCharacteristics over
FATAL BandGenLinSOE::getX - vectX == 0!

############################################################
I hope someone could give me some suggestions, thank you very much.

dear mhscott:
I'm very sorry to bother you again. After I modified the material, the following error appeared again. Is it the error of mass and gravity?
########################################
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 70(dW: << 0.0399154, dW0: 54389.5)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 124(dW: << 17.6352, dW0: 54390.6)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 205(dW: << -147.505, dW0: 66249.
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 259(dW: << -1.5762, dW0: 66237.4)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 316(dW: << 36.5342, dW0: 2.87936e+30)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 317(dW: << 0.000162453, dW0: 8.84531e+50)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 318(dW: << 3.19031e-05, dW0: 1.17461e+51)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 319(dW: << 11.7628, dW0: 8.319e+50)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 320(dW: << 0.012207, dW0: 5.2617e+50)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 321(dW: << 53.3961, dW0: 3.41671e+50)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 322(dW: << 3.2436e+06, dW0: 1.50835e+50)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 323(dW: << 0.000466452, dW0: 6.24894e+49)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 324(dW: << 0.100106, dW0: 2.05211e+49)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 325(dW: << 24.6021, dW0: 2.77182e+50)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 326(dW: << 28.8275, dW0: 6.26881e+50)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 327(dW: << 43602.6, dW0: 1.38711e+51)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 328(dW: << 0.0261023, dW0: 1.4938e+51)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 329(dW: << 25.9291, dW0: 9.45781e+50)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 330(dW: << 2.05181, dW0: 6.52874e+49)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 331(dW: << 1.9956, dW0: 6.08973e+49)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 332(dW: << 577.412, dW0: 8.12852e+47)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 333(dW: << 0.00747883, dW0: 7.15126e+46)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 334(dW: << 543.401, dW0: 4.01929e+47)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 335(dW: << 76.615, dW0: 2.11257e+28)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 336(dW: << 34.0905, dW0: 5.48202e+48)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 337(dW: << 6.61922, dW0: 1.09966e+48)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 338(dW: << 0.00788734, dW0: 1.05444e+48)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 339(dW: << 0.0732143, dW0: 1.34286e+48)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 340(dW: << 0.00165048, dW0: 1.32655e+48)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 341(dW: << 1.64592, dW0: 1.09572e+48)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 342(dW: << 1558.01, dW0: 6.89821e+47)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 343(dW: << 601.36, dW0: 5.16215e+47)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 344(dW: << 1.95124, dW0: 3.72582e+47)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 345(dW: << 9.35886, dW0: 1.91726e+47)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 346(dW: << 678.255, dW0: 1.53652e+47)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 347(dW: << 33.3958, dW0: 3.41324e+46)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 348(dW: << 0.00152398, dW0: 1.60179e+46)
WARNING - ForceBeamColumn3d::update - failed to get compatible element forces & deformations for element: 349(dW: << 6.71774, dW0: 7.40227e+45)
Domain::update - domain failed in update
LoadControl::update - model failed to update for new dU
WARNING ModifiedNewton::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
static over
################################################################

Looking forward to your reply, thank you very much.

Thank you very much for your reply, I will try again with a different material.

Hi, everyone：
I am building a cable-stayed bridge with two towers , and analyzing its seismic vulnerability, the piers and towers are nonlinearBeamColumn element,and they are made of fiber sections. The following error occurred in the gravity analysis stage.

#####################################################
UniaxialMaterial::setTrial() - material failed in setTrialStrain()
Large trial compressive strain
UniaxialMaterial::setTrial() - material failed in setTrialStrain()
Large trial compressive strain
UniaxialMaterial::setTrial() - material failed in setTrialStrain()
Large trial compressive strain
UniaxialMaterial::setTrial() - material failed in setTrialStrain()
ForceBeamColumn3d::update() - section failed in setTrial
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

##################################################
Does anyone have idea about where the problem is and give me some suggestions. I'd appreciate for your help. Thanks.