The above structure structure cannot keep its shape without the help of its supports A and B.
The above structure structure cannot keep its shape without the help of its supports A and B.
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Analysis of a frame (non-rigid) : If the structure is not a rigid unit by itself but depends on its external supports for rigidity, then the calculation of the external support members cannot be completed until the structure is dismembered and the individual parts are analyzed. |
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Many frames will collapse if detached from their supports, for example:The following free body diagram should be considered as 2 rigid bodies. |
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In the above figure, there are 4 unknowns: AX , AY , B X , BY . If we consider the structure as a whole, there are only 3 equations available. Thus, the support recations can not be found. To solve this problem, we consider the equilibrium of each 2 members separately. |
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