Stiffness
Stiffness
(OP)
Does anyone know of a site where I can get a reference for the stiffness (k) values of simple structures - propped cantilevers, single bay fixed fixed frames, double bay, double storey and the like.
I'm trying to analyse simple problems but they all start with needing to know the stiffness value and deriving it from first principles takes time and isn't the objective of the excercise.
I'm trying to analyse simple problems but they all start with needing to know the stiffness value and deriving it from first principles takes time and isn't the objective of the excercise.






RE: Stiffness
RE: Stiffness
RE: Stiffness
Is "formulas for Stress and Strain" on this site or do I google it or what?
RE: Stiffness
http:/
RE: Stiffness
All of the items you mention with the exception of the double story building can be modeled as single degree of freedom systems. The two story frame will require a two degree of freedom system.
The time it takes to derive one of these stiffness matrices is minutes compared to the aggregate sturctural stiffness matrix.
Many examples are available in so many texts on structural dynamics such as Timoshenko, Clough and Penzien, Craig, and Chopra, Borg and Bolton and so many others. Most have direct examples.
Regards,

Qshake
Eng-Tips Forums:Real Solutions for Real Problems Really Quick.
RE: Stiffness
RE: Stiffness
yAB = (Fbx^2)[(3L^2 - b^2)(x) + 3L(b^2 - L^2)]/(12EIL^3)