This option defines linear loads acting along a selected line defined on planar FEs of a structure. Open this dialog by clicking 
in the Load Definition dialog.
A temperature load can be applied to plate or shell structures. It can be uniform, linearly variable, or variably defined using 3 points.
To define a temperature load:
- Select the temperature load variability type:
- Uniform - When selected, this option ensures that the temperature load of the surface structure element (panel) is uniform.
- Variable 2P - When selected, the temperature load on the defined surface elements of the structure (panel) is linearly variable. You must specify the temperature value in two points (A and B).
- Variable 3P - When selected, the temperature load on the defined surface elements of the structure (panel) changes according to the defined plane. You must define the temperature value in the points (A, B, and C) which define the temperature load change plane.
- Specify the temperature load value (temperature and/or gradient) for the appropriate number of points (1, 2, or 3).
You can define points at which temperature values are determined 2 ways:
- Specifying point coordinates
- Highlight nodes in the structure.
You can define any temperature value on elements (by assigning the values for 3 points A, B, and C) or a temperature gradient along an element's thickness. The Temperature fields imply a constant temperature on the element; whereas, the Gradient fields indicate gradients in a direction perpendicular to the element' surface.
Planar loads are normally applied to the surface of an entire panel. To facilitate a load definition for curved panels (such as, a cylinder created using the Extrude option), you can select a certain set of finite elements (geometrical limits) for this type of load.
The Geometrical limits button is accompanied by a selection option at the bottom of the dialog:
- When the selection option is cleared, the Geometrical limits button is not available and no geometrical limits are influencing the load.
- When the selection option is selected, the Geometrical limits button becomes available, which lets you define geometrical limits for the load.