Form: Joint Load Assignment - Temperature
Use the Joint Load Assignment - Temperature form to assign a joint temperature change to selected joint objects. This temperature change in itself is not a temperature load. Temperature loads apply to shell and frame objects. When specifying a temperature load on an shell object, an option is available to specify that the value of the temperature load (change) be determined using the joint temperature changes specified using the Joint Load Assignment - Temperature form at the joints at the corners of a shell object.
When specifying a temperature load on a frame object (frame element), an option is available to specify that the value of the temperature load (change) be determined from the joint temperature changes specified using the Joint Load Assignment - Temperature form at the joints at the ends of a frame object. Thus, the overall objective for using the Assign menu > Joint Loads > Temperature command is to specify that temperature changes in shell and frame objects (shell and/or frame elements) be determined from the temperature changes specified at the corner or end joints of those elements. When a temperature change is applied directly to a shell or frame element, that temperature change is uniform throughout the element. Applying the temperature change based on the joints allows the temperature changes to vary linearly along the length of frame elements and to vary linearly over the surface area of shell elements. A positive temperature change corresponds to an increase in the temperature of an object.
Select the joint object to which a temperature change is to be applied.
Click the Assign menu > Joint Loads > Temperature command to access the Joint Load Assignment - Temperature form.
Use the following drop-down list, edit box, and options to specify the point temperature change:
Load Pattern Name drop-down list. Select the name of a defined load pattern to which the specified temperature changes are to be assigned. Note that the Define menu > Load Pattern command is used to define load patterns.
Temperature edit box. Specify the temperature change in this edit box. If the active units are English, the temperature is specified in degrees Fahrenheit, °F. If the active units are metric, the temperature is specified in degrees centigrade, °C. The active units can be displayed by right clicking the Units button on the Status Bar, lower right-hand corner, of the ETABS Window.
Options
Add to Existing Values: Adds the specified temperature changes to the joint object. If one or more temperature change assignments have already been made, this option increases the total temperature change on the joint object, assuming a positive temperature change is being specified.
Replace Existing Values: Replaces the currently specified temperature change, if any, with the new temperature change assignment. If no assignment exists, the new assignment is still made. This is the default option. Note that only the loads in the load pattern specified in the Load Pattern Name drop-down list are replaced.
Delete Existing Values: Deletes any and all temperature change assignments made to the selected joint object(s). When this option is selected, the items in the Temperature area of the form are ignored when the Apply button is clicked. Note that only the loads in the load pattern that is specified in the Load Pattern Name drop-down list are deleted.
Note that the default option is Replace and that the program defaults to this every time the form is opened.
Click the Apply button to complete the assignment.
When the Apply button is used, the Joint Loads Assignment - Temperature form will remain open until it is closed by clicking the Close button. This allows selection of another joint object(s), to which another assignments can be made.<="">
If only one assignment is being made to only one set of selected objects, the OK button can be used to both apply the assignment and close the form.
See Also