large deformation

khatibi_m · Post by **khatibi_m** » Sun Mar 14, 2010 11:54 pm

Dear all
can opensees consider large deformation effects?

Post by **fmk** » Mon Mar 15, 2010 9:54 am

the beam column elements can handle large-displacement small strin if you use the Corotational transformations.

imancivil · Post by **imancivil** » Mon Mar 29, 2010 7:18 am

Hi,

I think opensees cannot consider the effect of large deflection for trusses.
For a famous example (simple one-dimensional problem) that is a bar and has been mentioned in many references (e.g.Nonlinear Finite Element Analysis, Crisfield), we cannot see the actual equilibrium path (Load-deflection). Rather there is a jump in this path.

the problem is related to which factor? (corotTruss element, algorithm or integrator?)

tnx.

Post by **fmk** » Mon Mar 29, 2010 10:45 am

probably the integrator.

imancivil · Post by **imancivil** » Fri Jul 02, 2010 5:03 am

Hi,

Can we create a new integrator method or new algorithm in opensees?

tnx.

Post by **fmk** » Fri Jul 02, 2010 8:53 am

Helen · Post by **Helen** » Tue Jul 06, 2010 4:17 am

Hi,

I am a new user in opensees.
would you please guide me what the process of add a new integrator command in opensees is? is it based on c++ language?

Helen · Post by **Helen** » Wed Jul 14, 2010 11:12 pm

Dear Dr Mckenna,

would u plz guide me?

thank you.