- #1

Sadeq

- 107

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My main question is why we derive the structure matrix for a beam like the attached first picture; we assume the beam on the left on point B has no deflection? While i check this by computer analsysis program and it has an effect. Please explain in details

The second question is the displacement at nodal 2 has two vertical displacements and one rotation??

Why?? The logic says 1 vertical and no displacement since there is moment to prevent rotation

See picture 3 and 4 which are symbol and illustration

My third question why in truss the axial stiffness is much larger than shear and flexural stiffness, they always depend on the dimension and modules of elasticity so why in truss its larger and in beam it very small, why?

I appreciate your help, please explain in details

The second question is the displacement at nodal 2 has two vertical displacements and one rotation??

Why?? The logic says 1 vertical and no displacement since there is moment to prevent rotation

See picture 3 and 4 which are symbol and illustration

My third question why in truss the axial stiffness is much larger than shear and flexural stiffness, they always depend on the dimension and modules of elasticity so why in truss its larger and in beam it very small, why?

I appreciate your help, please explain in details