Analysis And Research On Contribution Of Carbon Emission Reduction Targets Under The "BIM+Prefabricated" Building Mode

With rapid economic development,the greenhouse effect is becoming more and more serious,and the global concentration of greenhouse gases increases and the environment is damaged.To alleviate the current carbon emissions situation,China has proposed carbon neutral and peak carbon reduction targets,and it has been found that the construction industry has the highest carbon emissions and it is necessary for this industry to reduce its carbon emissions.As a kind of green building,prefabricated buildings promote the transformation of the construction industry from production on site to factory production and gradually reach"two mentions and two reductions",reduce energy consumption in the construction industry and reduce environmental pollution through buildings.This paper categorizes the results of related studies on prefabricated buildings and their assessment of carbon emissions.Extraction of construction volume and simulation analysis of building energy consumption with the help of BIM techniques.A carbon measurement model will be set up and a comparative study of carbon emissions from buildings will be carried out.Based on the supply chain of prefabricated buildings,the carbon flow is analyzed over the life of the building and the factors that influence the reduction of the building’s CO₂ are extracted to construct an assessment system for the contribution of prefabricated buildings to carbon reduction targets.The C-OWA operator,entropy weighting method and cloud model evaluation model are used to analyze the carbon reduction target contribution of prefabricated buildings.The main results of the study are as follows:（1）Building a BIM-based measurement model for carbon emissions.This article examines the CO₂emissions of prefabricated buildings throughout their life cycle.The building model is an energy consumption model that is derived from the data interaction between the Revit and energy simulation software,and the energy-simulation software Design Builder is used to analyze energy simulation during the operating and maintenance phase of buildings,build a full life-cycle building inventory of buildings.Acquisition of basic databases and libraries of parameters based on specifications and literature.A BIM-based carbon emission measurement model is built by integrating the BIM technology with a carbon emission calculation model.（2）The carbon emissions of 2#office buildings are compared and analyzed under two construction modes:prefabricated and cast-in-place construction,by combining carbon emission measurement models.Based on the analysis of the carbon flow throughout the entire life chain of prefabricated buildings,this study isolates factors contributing to the reduction of carbon dioxide emissions from prefabricated buildings and an assessment model is built.（3）By combining the C-OWA operator with the entropy weighting method,it is possible to determine the index weights and construct cloud-based models for the carbon reduction assessment of the prefabricated buildings in this study.The applicability of the model is tested by using 2#office building as a case model to analyze the level of carbon reduction contribution of prefabricated buildings by evaluating the similarity of the cloud map to the cloud.This paper investigates the contribution of carbon reduction target under"BIM+prefabricated"construction mode.In the whole life cycle,the carbon flow is analyzed based on the supply chain of prefabricated buildings,the carbon emission of buildings is analyzed by using BIM technology,and the factors conducive to reducing carbon emissions are extracted based on the supply chain of prefabricated buildings,and a comprehensive evaluation model is established to ensure the inspection basis of coal emission reduction of prefabricated buildings.