中文摘要：

为了计算和评价桥梁全寿命周期内的碳强度指标，依据时间系列将整个桥梁寿命周期分为设计、原材料生产加工、施工、运营维护和废弃5个阶段，按照质量准则和造价准则分别核算材料损耗、交通运输、施工机械和办公场所4类碳排放源的碳排量，针对桥梁项目特点基于碳排量和经济成本建立碳强度指标，并应用改进的层次分析法进行多级模糊综合评价．采用本文模型对武汉市南太子湖大桥进行了工程应用分析，研究结果表明，该桥的碳强度介于碳强度适中与碳强度较大之间，其碳足迹主要集中在桥梁建设的原材料生产加工阶段和运营维护阶段．同时，在废弃阶段进行材料回收有利于节能减排．本文的桥梁碳足迹核算模型和桥梁环境综合评价方法兼顾了桥梁工程实施规律和经济成本影响，可为有效节能减排提供桥梁建设管理参考．

英文摘要：

To estimate the carbon footprint of bridge whole life cycle, a quantitative model was proposed in this paper. The life cycle was divided into five phases as programming, raw material production, construction, operation, maintenance and disuse. The carbon footprint of different Jource, such .as material, transportation, equipment ere,was accounted according to the criterion of mass and cost. The carbon intensity index was developed on basis of the feature of bridge engineering and economic cost. A multi,level assessment method was established based on modified analytic hieramhy process and comprehensive fussy analysis. As a case study, the southern Taizi Lake Bridge in Wuhan was analyzed and the assessment results 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 manager to assess the life cycle environmental impact.