Geometric nonlinear analysis. Initial deformation
Geometric nonlinear analysis. Initial deformation
(OP)
Dear friends,
I'm trying to model a beam with a initial deformation to perform a geometric nonlinear analysis. I know how to perform the nonlinear analysis but not to introduce the initial deformation. Can anyone help me?
Thanks in advance
I'm trying to model a beam with a initial deformation to perform a geometric nonlinear analysis. I know how to perform the nonlinear analysis but not to introduce the initial deformation. Can anyone help me?
Thanks in advance





RE: Geometric nonlinear analysis. Initial deformation
There's an automated load pattern option using load pattern type "notional" which applies a user specified percentage of gravity load(s) as a lateral load for purpose of introducing initial deformations or imperfections in the model. Notional loads are required by AISC steel design in the Direct Analysis method.
RE: Geometric nonlinear analysis. Initial deformation
RE: Geometric nonlinear analysis. Initial deformation
RE: Geometric nonlinear analysis. Initial deformation
Another option to model the initial bow deformation it is by introducing a 'strain' load that causes bending in the beam(asign-- frame loads---strain---curvature3axis or curvature2axis....). It should be introduced in a nonlinear load case-1. Then your geometric nonlinear analysis with P Delta (or say,nonlinear load case-2) should start from the end of load case-1.
You can also model the initial bow deformation by introducing a uniform distributed load, causing the same bending...