【摘要】 为推进桥梁工程践行绿色发展理念，提升桥梁工程节能减排水平，利用全生命周期评估(LCA),提出了大跨径桥梁工程全生命周期节能减排效益评估技术流程，构建了桥梁全生命周期节能减排评估指标体系，提出了节能减排指标核算方法与效益评估方法。以瓯江北口大桥为例，对其8个备选设计方案进行了节能减排核算与效益评估。结果表明：基准方案碳排放量为37 247.68 t,环境效益最优，且节能减排综合经济效益显著，为3 677～30 663万元，低于其他7个备选方案；从各类要素来看，建材资源是节能减排效益主要贡献源；从各阶段来看，建设期对节能减排效益贡献大，退役期物料回收贡献也不容忽视。本研究可为桥梁工程的节能减排核算提供技术方法参考。更多还原

【Abstract】 In order to promote the implementation of the concept of green development in bridge engineering and promote the level of energy saving and emission reduction in bridge engineering, the life cycle assessment(LCA) technology process for the benefit assessment of energy saving and emission reduction of long-span bridge engineering is proposed, the evaluation indicator system of bridge energy saving and emission reduction in whole life cycle is constructed, and the calculation method of energy saving and emission reduction indicator and benefit evaluation method are put forward. Taking the Oujiangbeikou Bridge as an example, energy saving and emission reduction accounting and benefit evaluation are carried out for 8 alternative design schemes. The result shows that(1) the carbon emission of the baseline scheme is 37 247.68 t, the environmental benefit is the best, and the comprehensive economic benefit of energy saving and emission reduction is remarkable, which is 36.77-306.63 million Yuan and lower than the other seven alternatives;(2) from various factors, building materials resources are the main contribution of energy saving and emission reduction;(3) from the point of view of each stage, the contribution of construction period to energy saving and emission reduction is great, and the contribution of material recovery in decommissioning period can not be ignored. This study can provide technical and methodological reference for energy saving and emission reduction accounting of bridge engineering.更多还原