The changes to the ASCE 7 ground snow load maps proposed for the 2022 edition target a uniform reliability rather than a uniform hazard – an important distinction – and are the first of their kind in ASCE 7. Previously, the ASCE 7 snow loads used a uniform-hazard 50-year mean recurrence interval (MRI) with a 1.6 load factor. The newly proposed loads directly target the safety levels stipulated in Chapter 1 of ASCE 7, resulting in a strength design level load that is to be used with a load factor of 1.0. This paper describes changes in design provisions that result from this transition to reliability-targeted loads and provides reasons for some of these differences.
Maguire, Marc; Bean, Brennan; Harris, James; Liel, Abbie; and Russell, Scott, "Ground Snow Loads for ASCE 7-22 – What Has Changed and Why?" (2021). Mathematics and Statistics Faculty Publications. Paper 277.