Modify AISC Safety Factors

Question

Hello, 
 I am doing a Blast design on STAAD.Pro, and according to our basis of design the safety factors should be 1.0. 
 I am using AISC 360-05: ASD as the design code. The question is how can I change the safety factors for all Tension-Compression, Flexure and shear to 1.0? STAAD uses a factor of 1.67 as a default. 
 Thank you for your help.

Sye · Accepted Answer

There is no way to modify the design strength calculations as the safety factor is inbuilt. As a workaround, you may define a few additional load combinations for design where you may apply a factor of 1/1.67 = 0.6 approx. on top of the usual combination factors. For example if your usual combination is 
 
LOAD 100 : DL + LL 
REPEAT LOAD 
1 1.0 2 1.0 
 
You may create an additional load combination 200 and use that for design 
 
LOAD COMB 200 
100 0.6 
 
Where Load case 1 = DL and Load case 2 = LL

Sye · Answer

Specifying RATIO may not work for all cases. For example interaction equations like H3-6 or H1-2 which are not linear