We are trying to tell if the structure shown will fail or not under applied loading. Do we need to consider a partial element or the entire stiffener plate? If we can get the ultimate moment from STAAD in Mx and My for a particular plate element and we calculate that it is greater than the nominal moment for that element, does the entire stiffener plate fail? Or when the plate element becomes over-stressed, does the excess stress get distributed among the adjacent plate elements until the excess load is dissipated and the overall stiffener plate is OK?
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