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Overview
When line or area springs are assigned to an object, SAP2000 generates equivalent joint springs at each node created during auto-meshing. Joint-spring stiffness is determined from tributary area and the line- or area-spring stiffness which is assigned to the object. As a result, joint springs which support interior joints are stiffer than those at corner joints. Since contact pressure is proportional to joint-spring deformation and the displacement of those joints to which springs are attached, users may obtain contact pressure through the product of spring-stiffness constant and displacement, available for output in both graphic and tabular format.
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Link stiffness is defined as follows:
1kN/m when used as a joint link
1kN/m/m when used as a line spring
1kN/m/m 2 when used as an area spring
The values specified for Factors For Line, Area, and Solid Springs, available on the Link/Support Property Data menu, are explained in Figure 1:
Figure 1 - Link and support property data
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Area-spring and auto-mesh assignment
Figure 2 - Area-spring and auto-mesh assignment
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The software automatically creates equivalent joint springs which represent those line and area springs which are assigned to an object. These joint springs are displayed through View > Set Display Options > Show Analysis Model, as shown in Figures 3 and 4:
Figure 3 - Show analysis model
Figure 4 - Equivalent joint springs
Attachments
SAP2000 V12.0.0 model (zipped .SDB file)
Metadata
Name: Line and area springs
Description: This test problem demonstrates and validates the application of line and area springs.
Program: SAP2000
Program Version: 12.0.0
Model ID: na