I know that the IBC Code no longer allows a 1/3 stress increase factor for working stress design. However, the code states that if two or more transient loads are used it is permitted to multiply the combined effects of the transient loads by 0.75. I used to only apply the old 1/3 factor to the effects of wind or seismic with combinations. The question may sound odd, but in my mind wind and seismic were transient loads. Is live load and snow now also considered to be transient. The code never really defines the word transient.
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