What are the results one gets from STAAD for the deflection check?
If the steel design parameter called TRACK is set to 2.0, the L/d ratio calculated for the member can be obtained in the STAAD output file. The value is reported against the term “dff”. Notice that the expression is in lower-case letters as opposed to the upper-case “DFF” which stands for the allowable L/d. If “dff” is smaller than “DFF”, that means that the displacements exceeds the allowable limit, and that leads to the unity check exceeding 1.0. This is usually a cause for failure, unless the RATIO parameter is set to a value higher than 1.0. If “DFF” divided by “dff” exceeds the value of the parameter RATIO, the member is assumed to have failed the deflection check.
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