Some steel design codes permit you to increase the allowable stresses by a set amount (usually 33 or 50%) for load cases that only involve temporary loading. Steel Designer allows you to utilize this option by using the Allowable Stresses option from the Design menu. This allows you to enter a factor for the allowable stress increase for each load case.

The initial value of the allowable stress increase factor is 1.0 for all load cases. If, for example, you wanted the stresses for a load case to be allowed to increase by 33%, you would enter a value of 1.33.