碳减排量化导向下承重砌体墙加固方案技术经济评价研究与应用

Research and Application of Technical and Economic Evaluation of Reinforcement Scheme of Load-bearing Masonry Walls under the Guidance of Carbon Emission Quantification Reduction

2020年9月中国向世界提出“碳达峰”与“碳中和”,明确坚定的碳减排目标,建筑业是“排碳大户”,也是实现“双碳”目标的重点领域。随着改革开放之初兴建的既有房建建筑陆续接近服役期,现存既有建筑维修升级及安全性改造体量越来越大,当下在这个领域的研究大多关注的是加固技术本身,而缺乏基于包含碳排放等绿色化相关量化指标的更全面、更系统的技术经济评价。以实际工程项目为例,提出了一种碳减排量化导向下的承重砌体墙加固方案评价方法,选取了安全性、功能性、环保性、经济性4个维度的23个细分评价指标,运用层次分析法确定各指标所占的权重,最后模糊综合评价出综合价值占优的加固方案,并通过实际案例应用在备选方案中评价优选出了纤维增强复合材料(高延性混凝土)加固技术方案。研究强调选择加固方案时需要综合考虑多项指标,进而发现采用合适的承重砌体墙加固材料和施工机械是减少加固能耗和碳排放的有效方法之一,同时认为碳排放量计算需考虑能源消耗与碳排放量两者的耦合因素。经过验证,研究为碳减排量化导向下承重砌体墙加固方案技术经济评价提供了一种有效方法。

In September 2020,China proposed to the world"carbon peak"and"carbon neutrality",with clear and firm carbon reduction targets,and the construction industry is a"major carbon emitter"and a key area to achieve the"double carbon"goal.As the existing build‐ings built at the beginning of the reform and opening up approach the service period one after another,the maintenance and upgrading of ex‐isting buildings and the safety transformation of existing buildings are getting larger and larger.Currently,most studies in this field focus on the reinforcement technology itself,and lack a more comprehensive and systematic technical and economic evaluation based on quantitative in‐dicators related to green,such as carbon emissions.Taking actual engineering projects as an example,proposes an evaluation method for the reinforcement scheme of load-bearing masonry walls under the guidance of quantitative carbon emission reduction,selects 23 subdivision evalu‐ation indexes from four dimensions of safety,functionality,environmental protection and economy,uses analytic hierarchy process to deter‐mine the weights of each index,and finally makes a fuzzy comprehensive evaluation of the reinforcement scheme with superior comprehen‐sive value.The technical scheme of fiber reinforced composite(high ductility concrete)reinforcement is evaluated and optimized among the al‐ternatives by practical cases.This study emphasizes the need to consider a number of indicators comprehensively when selecting reinforcement schemes,and then finds that the use of appropriate load-bearing masonry wall reinforcement materials and construction machinery is one of the effective ways to reduce energy consumption and carbon emissions in reinforcement,and considers that the coupling factors of energy con‐sumption and carbon emissions should be considered in the calculation of carbon emissions.It provides a method for technical and economic evaluation of the reinforcement scheme of load-bearing masonry wall under the guidance of carbon emission reduction quantification.