![]() For structure comprising a series of elements,ġ. General Formula in the Direct Stiffness Method Additional node is needed when user wants to assign load on the other location. Load can be applied on the identified node. For the model with axial and bending deformation neglected, modify the shear correction factor so that the shear area is equal to the original area value. For the model with bending moment ignored, set the moment inertia value to zero. For the model with axial deformation ignored, replace the area value with a very large number. For the model with shear deformation ignored, set the shear correction factor to a large number so that the shear area is equal to zero. For the model with bending deformation ignored, enlarge the moment inertia to increase rigidity of the structure. Non-homogeneous boundary conditions occur when finite nonzero values of displacement are specified, such as the settlement of a support. Homogeneous boundary conditions occur at locations that are completely prevented from movement, such as: Forces and displacements are positive in the positive x and y directions.Moments and rotations are positive in the counterclockwise direction.At all nodes, the following sign conventions are used: Every node has three degrees of freedom in a consecutive identity number.
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