Lack of Fit in a truss refers to a situation where one or more members in a pin-jointed statically indeterminate frame do not exactly match the required lengths due to manufacturing tolerances or errors. Specifically:
Definition: Lack of fit occurs when members of a truss are either slightly shorter or longer than their intended lengths. During assembly, these members must be forced into place, leading to pre-existing internal forces in the truss structure, even in the absence of external loads.
Implications: This discrepancy can induce internal stresses and forces within the truss, which can affect the overall stability and performance of the structure. Such forces arise due to the need to adjust members to fit, which can result in additional internal forces and potential deformation of the truss.
In summary, lack of fit is a condition that introduces internal forces and affects the structural behavior of a truss, particularly in statically indeterminate frames.
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