fiber section ERROR

yinxia3690 · Post by **yinxia3690** » Fri Aug 13, 2010 4:15 pm

i have another new question:why i got the error such as
ERROR: 2.69113 5.39563
ERROR: 1.8472 4.63419
ERROR: 0.918322 3.79611
ERROR: -0.0226376 2.94712
ERROR: -0.967618 2.09451
ERROR: -1.91442 1.24024
ERROR: -2.86221 0.385095
when i use some fiber sections?But there is no error when i use other similar fiber sections.
thank you very much!

yinxia3690 · Post by **yinxia3690** » Tue Aug 17, 2010 2:01 am

why nobody could answer my question?

zvidrih · Post by **zvidrih** » Tue Aug 17, 2010 4:22 am

Hi,

please paste your input file. No one can help you, if you don't define the problem. Those errors could be anything...

nbubzy · Post by **nbubzy** » Wed Aug 25, 2010 11:32 pm

Maybe the fiber section defination has some error.
You can try to change the fiber divid numbers of section.

yinxia3690 · Post by **yinxia3690** » Sat Aug 28, 2010 12:03 am

Dear everyone,
I tested my fiber section,it still had error.This is my file:
wipe;
model basic -ndm 3 -ndf 6;
logFile errorFile
node 1 0 0 0
node 2 0 0 100
fix 1 1 1 1 1 1 1
set GJ 1.0e20;
uniaxialMaterial Elastic 100 $GJ;
uniaxialMaterial Concrete04 1 -2.68e+7 -0.002 -0.004 3.25e10 2.39e+6 0.0001 0.1
uniaxialMaterial Concrete04 10 -3.08e+7 -0.0035 -0.01 3.25e10 2.39e+6 0.0001 0.1
uniaxialMaterial Concrete04 11 -2.81e+7 -0.0025 -0.01 3.25e10 2.39e+6 0.0001 0.1
uniaxialMaterial Steel01 17 2.35e+8 2.1e+11 0.01
geomTransf Linear 5 1 0 0;
section Fiber 101 {;
#the cover
patch quad 1 7 1 -3.35 -6 3.35 -6 3.29 -5.94 -3.29 -5.94
patch quad 1 17 1 3.35 -6 3.35 6 3.29 5.94 3.29 -5.94
patch quad 1 7 1 3.35 6 -3.35 -6 -3.29 5.94 3.29 5.94
patch quad 1 17 1 -3.35 6 -3.35 -6 -3.29 -5.94 -3.29 5.94
#the core
patch quad 11 2 2 -0.92 3.94 0.92 3.94 0.92 5.94 -0.92 5.94
patch quad 11 2 2 -0.92 -5.94 0.92 -5.94 0.92 -3.94 -0.92 -3.94
patch quad 10 3 17 -3.29 -5.94 -0.92 -5.94 -0.92 5.94 -3.29 5.94
patch quad 10 3 17 0.92 -5.94 3.29 -5.94 3.29 5.94 0.92 5.94
#the steel
layer straight 17 93 0.000201 3.29 5.74 3.29 -5.74
layer straight 17 93 0.000201 -3.29 5.74 -3.29 -5.74
layer straight 17 51 0.001232 3.29 5.94 -3.29 5.94
layer straight 17 51 0.001232 3.29 -5.94 -3.29 -5.94
layer straight 17 81 0.000201 -2.6 5.25 -2.6 -5.25
layer straight 17 81 0.000201 2.6 5.25 2.6 -5.25
layer straight 17 37 0.000201 -2.6 5.25 2.6 5.25
layer straight 17 37 0.000201 -2.6 -5.25 2.6 -5.25
layer straight 17 79 0.000201 -0.92 5.12 -0.92 -5.12
layer straight 17 79 0.000201 0.92 5.12 0.92 -5.12
layer straight 17 35 0.000402 -2.49 -3.94 2.49 -3.94
layer straight 17 35 0.000402 -2.49 3.94 2.49 3.94
};
section Aggregator 1101 100 T -section 101;
element nonlinearBeamColumn 1 1 2 5 1101 5 -mass 83029.23;
set lambda [eigen 1]
set omega [expr pow($lambda,0.5)]
set Tperiod [expr 2*3.14/$omega]
puts $Tperiod

The result is:
ERROR: 2.68708 5.38914
ERROR: 1.84445 4.62772
ERROR: 0.916945 3.78962
ERROR: -0.022607 2.94063
ERROR: -0.966171 2.08801
ERROR: -1.91156 1.23374
ERROR: -2.85792 0.378593
5.806326082185498

Please help me.Thank you!
PS:I found that the period T is affected so much by the divid number of fiber section.I donot understand the reason.

nbubzy · Post by **nbubzy** » Sun Aug 29, 2010 7:23 pm

what units you use?
the element length is 100,
the area of steel bar is about 0.001?
your quad fiber length in IJ direction is about 1,while in IK direction is about 0.06,so the fiber is not very good.

zgdyjs · Post by **zgdyjs** » Mon Aug 30, 2010 9:36 pm

[quote="yinxia3690"]why nobody could answer my question?

[/quote]
Hello,I meet the same problem.Can you tell me how do you deal with this problem ? Thank you!

yinxia3690 · Post by **yinxia3690** » Tue Aug 31, 2010 5:02 am

It works OK now!I input the wrong sign of the coordinate.