Hello,
I am using the STAAD pro advanced
I am writing for have a 2 questions.
1. Can I defined allowable stress?
In my project some of case just need to calculated uc by Yield stress or tensile strength (do not used allowable stress). but, in the program, automatically input the AISC when If I am undefined the code.
2. How can I except the load case for UC calculation?
because, I have 4 load case for each axis of wind load and combined them. but the severe case is not combined load case so, I could not check the UC ratio in the combined case.
1) You cannot define the allowable stress. You would need to manually compare acting forces with yield stress or tensile strength.
2) You can use a LOAD LIST xxx command in the input file before the design parameters, where xxx will be a load case numbers which will be considered during the design.
In the AISC 9th edition code (invoked through CODE AISC) there is a design parameter called OVR that lets you specify a factor by which the allowable stresses are multiplied. You may use that to modify the allowable stresses.