Study on consideration of steel resources in society of global warming environmental impact assessment on infrastructures

全球变暖对环境的影响是世界范围内最重要的问题。在本研究中，桥梁的钢材体积被认为是社会资源，钢材体积是分析的参数之一。分析方法采用数据包络分析(DEA)和超数据包络分析(SuperDEA)，以全寿命周期的二氧化碳排放量和全寿命周期成本为输入数据，以钢材的寿命和体积为输出数据。在现有的桥梁系统中，考虑社会钢材资源对环境的影响时，各类型桥梁的DEA分析结果相差不大。在使用超级DEA进行分析的情况下，对桥梁的环境影响进行了高可靠的排序。

The global warming environmental impact is most important problem all over the world. In this study, the volumes of steel of bridges are considered social resource, and the volume of steel is one of the parameter for analyses. The analytical methods are performed by Data Envelopment Analysis(DEA) and super DEA, also parameters are CO2 emissions of lifecycle and lifecycle cost are used as input data, life length and volume of steel are used as an output data.In the present bridges system, when considering the social steel resource environmental impact of the all type of bridges are not larger deference occurred in DEA analyses. In the case of analyses are performed by using super DEA, high reliable ranking carried out for the environmental impact of bridges.