Grillage Model In Plane Deformation
Grillage Model In Plane Deformation
(OP)
I'm fairly new here to the forum but so far it's been pretty useful. Here is a question that I have:
I've been reading up on grillage modelling of bridge decks. From what I understand, the grillage model has three degrees of freedom; out of plane translation, and rotation about both in-plane axis. Is it possible to use a grillage model for in plane deformations caused by forces such as thermal expansion/contraction by adding some additional degrees of freedom on my grillage elements? If I model my support conditions correctly for in plane deformations, would the grillage model predict in-plane deformations correctly?
Any help would be great. Thank you.
I've been reading up on grillage modelling of bridge decks. From what I understand, the grillage model has three degrees of freedom; out of plane translation, and rotation about both in-plane axis. Is it possible to use a grillage model for in plane deformations caused by forces such as thermal expansion/contraction by adding some additional degrees of freedom on my grillage elements? If I model my support conditions correctly for in plane deformations, would the grillage model predict in-plane deformations correctly?
Any help would be great. Thank you.





RE: Grillage Model In Plane Deformation
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/
RE: Grillage Model In Plane Deformation
I'm thinking the in-plane deformations of a grillage model are inaccurate compared to a full 3D FE model because the stiffness of the plate being modeled as a grillage along the in-plane surface is not correctly modeled by just longitudinal and transverse members?
Any other thoughts?
RE: Grillage Model In Plane Deformation
Yes, in fact a grillage model won't have any output of in-plane deformations, or any provision for input of in plane forces or deflections. If it is a true grillage these things do not appear in the analysis.
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/