Results Interpretation: Load Influence Analysis Results

Description

The Load Influence Analysis (.LIA) results describe the influence that a point load or point moment has on a specified response variable. A response variable can be a node displacement, a node rotation, or one of any number of element result quantities such as element force, element moment and element stress. For example, if a beam axial force response variable is assigned, the load influence analysis results establish the effect that a point force or point moment at any node in the model has on this axial force.

The load influence results have units that depend on the response variable; for example, if the response variable is a translational displacement at a node, the corresponding influence results due to forces will have units of displacement/force while the influence results due to moments will have units of displacement/moment. Similarly, a brick stress response variable will produce influence results due to forces with units of stress/force while the influence results due to moments will have units of stress/moment.

The following table summarises what each influence result means and the corresponding result units.

	Entity Attribute	Response Variable	Applied Direction	Units for Result DoF 1-3	Description	Units for Result DoF 4-6	Description
1	Node	Displacement	1-3	Length / Force	Displacement of the response node due to a point force applied to the result location.	Length / Moment	Displacement of the response node due to a point moment applied to the result location.
2	Node	Displacement	4-6	Angle / Force	Rotation of the response node due to a point force applied to the result location.	Angle / Moment	Rotation of the response node due to a point moment applied to the result location.
3	Node	Reaction	1-3	Force / Force	Force reaction at the response node due to a point force applied to the result location.	Force / Moment	Force reaction at the response node due to a point moment applied to the result location.
4	Node	Reaction	4-6	Moment / Force	Moment reaction at the response node due to a point force applied to the result location.	Moment / Moment	Moment reaction at the response node due to a point moment applied to the result location.
5	Beam	Force	Shear Forces / Axial Force	Force / Force	Shear forces or axial force of the response beam end due to a point force applied to the result location.	Force / Moment	Shear forces or axial force of the response beam end due to a point moment applied to the result location.
6	Beam	Moment	Bending Moments / Torque	Moment / Force	Bending moments or torque of the response beam end due to a point force applied to the result location.	Moment / Moment	Bending moments or torque of the response beam end due to a point moment applied to the result location.
7	Plate	Force	Any	(Force / Length) / Force	Membrane forces per length at the centroid of the response plate due to a point force applied to the result location.	(Force / Length) / Moment	Membrane forces per length at the centroid of the response plate due to a point moment applied to the result location.
8	Plate	Moment	Any	(Moment / Length) / Force	Bending moments per length at the centroid of the response plate due to a point force applied to the result location.	(Moment / Length) / Moment	Bending moments per length at the centroid of the response plate due to a point moment applied to the result location.
9	Brick	Stress	Any	Stress / Force	Stresses at the centroid of the response brick due to a point force applied to the result location.	Stress / Moment	Stresses at the centroid of the response brick due to a point moment applied to the result location.