prestressed reinforced concrete structures in femap 1

[garber.eugenie]

Hello, dear engineers!

I have a prestressed reinforced concrete beam. How should I model reinforcement prestressing correctly and are there any special functions to do it in femap?
(it is especially interesting how the compression of concrete is taken into account in the simulation)

 

[karachun]

Hello.
To model prestress you can use negative temperature combined with nonzero thermal expansion coefficient for steel and zero coefficient for concrete.
You also should use a nonlinear solver to apply prestress and operating load sequentially.

 

[garber.eugenie]

And how should I apply temperature? to the whole beam or to the ends of the beam?

 

[karachun]

To the whole Beam.

 

[tatox]

i believe the prestressed reinforced beam is need the stage construction analysis. There is the birth and dead of element, plus the changing of the load and the changing of the restraint, time related material for creep and shrinkage also the increasing of modulus of the concrete, curvatured line tendon for prestressed into the concrete beam/solid element, grouting process, modified the beam inertia due steel prestress add on. I dont know if i found like that in FEMAP or other full blown FEA. That only i found at the civil eng software. Getting thermal load only gave you axial compression force in the same as the neutral axis.