Notes 53 - Modeling - Spring Supports

Notes 53 - Modeling - Spring Supports - Modeling Spring...

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Modeling – Spring Supports - Page 1 of 1 Modeling - Spring Supports Objectives: 1) Use springs to model fixed boundary conditions 2) Model slanted Boundary Conditions with rotated springs 3) Choose the correct spring value for modeling fixed supports So far we have handled fixed support conditions by eliminating a DOF at the location of fixity. This has the effect of specifying the displacement at that DOF as exactly zero. In addition, this method reduces the total number of unknowns to only those that are not specified. Another method for specifying fixity is to allow the DOF to exist and then place a very stiff spring at that DOF to restrain movement. For example, a simple single bay frame can be modeled as having fixed supports with either of the following methods: If a roller support were needed, this could be handled by placing a very stiff spring at the roller location offering vertical support only.
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Modeling – Spring Supports - Page 2 of 2 Inclined Supports The use of springs becomes necessary when the support is needed in a direction other than one of the global directions. For example, if an inclined roller were needed, this could be handled by placing a spring at the roller location. However the spring must be
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Notes 53 - Modeling - Spring Supports - Modeling Spring...

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