Hello Im doing structural analysis at the moment, and I seem to have run into a

Question

Hello

Im doing structural analysis at the moment, and I seem to have run into a small problem with my calculations. Everytime I try to solve for the structural stiffness matrix which is represented by the following formula k = T'n'T, I seem to have issues inputting the correct units into the equation i.e. AE/L * [1 -1 ; -1 1) Sometimes, the book simply states that A - 1000 mm2 and E = 200 GPa. I need to solve this problem in respect to metres.

Now, my lecturer has provided me with a problem to solve stating that EA of each element is 1900 kN. How can he/the question represent EA or AE (Cross sectional area * modulus of (Rigidity? Elasticity?) in such a way? Thank you.                                                                   

Explanation / Answer

E = stress / strain, unit = kN/m^2

A = Area, unit = m^2

Therefore EA = kN/m^2 x m^2 = kN

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