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Formula for global stiffness matrix is ____________

(a) No. of nodes*Degrees of freedom per node

(b) No. of nodes

(c) Degrees of freedom per node

(d) No. of elements

This question was posed to me during an interview.

This intriguing question originated from One Dimensional Problems in chapter One Dimensional Problems of Finite Element Method

1 Answer

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Best answer
Right answer is (a) No. of nodes*Degrees of freedom per node

Best explanation: Generally global stiffness matrix is used to complex systems. Stiffness matrix method is used for structures such as simply supported, fixed beams and portal frames. Size of stiffness matrix is defined as:

Size of global stiffness matrix=No. of nodes*Degrees of freedom per node.

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