3 . " utility " concept is introduced into the engineering area . to unify the economic and non - economic factors in engineering structures risk analysis the max expected utility value ( euv ) method is presented 3 、引进了“效益”的概念,提出了在工程结构风险分析中应用最大期望效益准则( euv )的方法,使经济价值因素和非经济价值因素得到统一。