output on section analysis

[xuejian]

Hi,

I am doing a sectional moment-curvature analysis and need more output parameters like the tensile and compressive resultant force. Since there are many fibers, it will be terrible by using output of stress-strain of each fiber and sum them up.
So, can I output the sectional resultant force in tension and compression directly without counting each fiber?

Thanks,
Xuejian

[ocean2000]

you can find answer follow:
---------------------
Sections:

section $secNum – request response quantities from a specific section along the element length,

$secNum refers to the integration point whose data is to be output

force – section forces

example: recorder Element -file ele1sec1Force.out –time -ele 1 section 1 force

deformation – section deformations

example: recorder Element -file ele1sec1Force.out –time -ele 1 section 1 deformation

stiffness – section stiffness

example: recorder Element -file ele1sec1Force.out –time -ele 1 section 1 stiffness

stressStrain – record stress-strain response.

example: recorder Element -file ele1sec1Force.out –time -ele 1 section 1 fiber $y $z <$matID> stressStrain


$y
local y coordinate of fiber to be monitored*


$z
local z coordinate of fiber to be monitored*


$matID
previously-defined material tag (optional)


*NOTE: The recorder object will search for the fiber closest to the location ($y,$z) on the section and record its stress-strain response

[xuejian]

But I am still a little confused. Actually what I want to do is SECTIONAL moment curvature analysis and output from Opensees the tensile and compressive RESULTANT force on the cross section.
We can output the stress and strain of each fiber and sum the force in each fiber and sum up. But a little large number of fibers will make the work boring.

Thanks for the response.
xuejian

[ocean2000]

opensees can directly output the SECTIONAL moment curvature data.
just :
example: recorder Element -file ele1sec1Force.out –time -ele 1 section 1 force
and
example: recorder Element -file ele1sec1Force.out –time -ele 1 section 1 deformation

you can refer to the example 3.3