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obtaining stiffness terms (beam modeled with shell elements)

obtaining stiffness terms (beam modeled with shell elements)

obtaining stiffness terms (beam modeled with shell elements)

(OP)
Hi to all,

As a new ABQ user, I have a problem in obtaining stiffness matrix terms (6EI/L2, 12EI/L3, etc.) for a beam.
I have modeled the beam with shell elements, however I cannot obtain the thoretical values in ABQ.

Section properties:

I section,
flanges:30cm wide x 1.5cm thick
web: 40cm high x 0.8cm thick

Area becomes 122 cm2.
Mom. of inertia is 43034.2 cm4

Total length is 300 cm
Material: Steel (E=210GPa, elastic)
 
Steps:
1) Unit axial displacement at end_i . (1cm displacement)
Horizontal reaction (EA/L) shoud be 8540 kN (theoretical). ABAQUS yields 8619.25kN. Different, but OK.

2) Unit vertical displ. at end_i. (1cm displ.)
Theoretical 12EI/L^3 gives 401.65 kN.
No chance to catch this value in ABAQUS. Always silly values...

Maybe some problem with coupling of nodes??? Anyone with an idea? I may readily post CAE file...

With my best regards,


A.Bederan  

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