1.6. General overview the random design methodology:1.6.1. The way of shaping the random design methodThe evolution of logic methods of design works have been summarized as follows. They are calculated according to the deterministic methods (according to the permitted stresses and safety), the premise is the load calculation and strength has been the default during the working of the process. In fact, the load function and durability impact of many different factors, and laws change randomly. So the fix before the calculated value of them during the time worked by the process is not yet satisfactory. In return, to increase the level of reserves, one must reduce the value of stress enabling, or increase the safety coefficient lets up. The increase or decrease of this inevitable subjective elements.
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