Method for evaluating environmental effect on bridge life cycle

The invention relates to a method for evaluating environmental effect on a bridge life cycle. Based on a life cycle evaluation technology frame provided by ISO14040, the method comprises the following steps of: assembling and quantifying bridge life cycle environmental effect factors by using a bill of process analysis method; introducing an end point damage evaluation thought into bridge life cycle environmental effect evaluation; selecting three types of end point environment effects such as ecological damage, human health and resource exhaustion; quantitatively describing the damage degrees of the bridge life cycle environmental effect factors on the three types of end point environment effects by using three indexes such as potential species loss disappear ratio, disability adjustment healthy life years and residual energy source; selecting an average environment effect potential value of China in 1995 as a standard value; determining the weighted values of the three types of environment effects by an ana