桥梁全寿命周期碳强度指标模糊综合评估

In order to estimate the carbon footprint of bridge whole life cycle, a quantitative model was established. The life cycle was divided into five phases as programming, raw material production, construction, operation, maintenance and disuse. The carbon footprint of different source, such as material, transportation, equipment etc, was accounted according to the criterion of mass and cost. The carbon intensity index was proposed considering the feature of bridge engineering and economic cost. A multi-level assessment method was developed based on modified analytic hierarchy process and comprehensive fussy analysis. As a case study, the southern Taizi Lake bridge in Wuhan was analyzed and the assessment result indicated that the carbon intensity of this bridge was between medium and comparatively large, and the carbon footprint was mainly concentrated in the phases of raw material production and construction. The carbon footprint model and carbon intensity index assessment method which combine environmental impact together with economic cost, were of high applicability in real bridge project, and could be used as a reference for bridge management section to assess the life cycle environmental impact.