Ok, so looking through this forum and others there seems to be a big debate with people on both sides whether a 1.5 factor of safety needs to be applied to the 0.6DL + WL load case. From my research I have come to the conclusion you do not double them up, with the below linked article stating...
We have recently got a job to design a stair case for a building in china. Rather than just specing normal AISC and ASTM beams we want to spec sizes and materials common in china. I have been searching and have found the ASTM Handbook of Comparative World Steel Standards 4th Edition. Which...