Approximations for extremes of combinations of stochastic load effects

Various combination formulas are currently in use for estimating the extreme values of linear combination of load effects. Two of the most widely used of these are known as the 'Square Root of Sum of Squares' formula or briefly, the SRSS formula, and Turkstra's rule. Both combination formulas have been implemented in such a way that statistical dependence between the load effect components can be taken into account. This makes it possible to investigate the performance of these two particular combination formulas both for independent and de pendent load effect components. The paper presents some results from a rather extensive numerical investigation of the accuracy of the SRSS formula together with similar results for Turkstra's rule.