Simplified load combination factor for snow load

The load combination factor for snow load is formulated by a simplified development based on Turkstra's rule for load combination and the Gumbel distribution for the snow load model. The probability of exceedance expression is compared with an existing probabilistic load model. The load combination factor is expressed in terms of the period of snow duration and the ratio between the standard deviation of the principal load effect and the accompanying snow load effect. Numerical examples are presented and discussed with the load combination factor used in Japanese current practice.