Study On The Calculation Of Carbon Emission In The Whole Life Cycle Of Building Steel Structure Engineering

Climate warming caused by greenhouse gases has posed a serious threat to human survival and biological diversity.It has become the consensus of all countries in the world to take the path of green and low-carbon development.China,as the pioneer of "a community with a shared future for mankind",has put forward the great goal of "carbon neutrality and carbon peak".The carbon emission of our construction industry accounted for 50.6% of total carbon emission,so it is urgent to promote industrial structure optimization and energy structure adjustment in the building industry.The development of steel structure building is important to promote the transformation of construction industry to industrialization,informationization,low carbon transformation,which has been promoted by the government and the market in recent years.However,the current research on carbon emission quantification in the stage of construction steel structure manufacturing,installation and removal is insufficient,lacking a scientific,practical and rapid carbon emission quantification method.In this thesis,the whole life cycle carbon emission calculation of building steel structure engineering is taken as the research objective,and the objective is systematically studied from three levels: theoretical research on carbon emission calculation,carbon emission factor analysis and carbon emission quantitative model establishment.The main research contents and conclusions are as follows:(1)The standard basis,range boundary and calculation method of carbon emission in the whole life cycle of building steel structure engineering are determined.The theoretical research on carbon emission calculation is the theoretical basis and standard support for the establishment of carbon emission quantitative model.Based on the applicable level of carbon emission calculation standard and the product characteristics of building steel structure,this thesis chooses PAS 2050 standard for product level and "Building Carbon Emission Calculation Standard" applicable to building level as the research standard basis.A method is proposed to determine the carbon emission calculation boundary of steel structures based on space range and time range.Based on the principles of convenience,accuracy and applicability,five mainstream carbon emission calculation methods are analyzed,and carbon emission factor method is determined as the carbon emission calculation theory for the whole life cycle of building steel structure engineering.(2)A list of carbon emission factors applicable to the whole life cycle of building steel structure engineering is established.As carbon emission factor is the data basis of carbon emission calculation of building steel structure and plays an important role in carbon emission quantification system,this thesis takes timeliness,regionality,applicability and authority as evaluation criteria,analyzes national norms,reports of professional research institutions,international carbon emission database and carbon emission factor research data of domestic and foreign scholars.The carbon emission factors of electric energy,fossil fuel,steel,auxiliary materials and machinery platform were evaluated and analyzed,and a set of carbon emission factors list suitable for building steel structure engineering was established.(3)The calculation model of carbon emission in the whole life cycle of building steel structure engineering is established.Carbon emission calculation model is the core content of carbon emission quantification.This thesis determines the carbon emission calculation boundary of steel structure engineering in the whole life cycle from two dimensions of space and time.The process of manufacturing,installation and dismantling is analyzed in detail,and the corresponding carbon emission source list is established.Based on the carbon emission factor method,a mathematical model of carbon emission applicable to the whole life cycle of steel structure engineering is proposed,and the corresponding case analysis and result interpretation are given.(4)The calculation method of carbon emission in the whole life cycle of steel structure engineering is established based on the engineering consumption quota.Based on the engineering consumption quota and carbon emission factor calculation method,the calculation method of carbon emission in the whole life cycle of steel structure engineering is established.The feasibility of this method is verified through the case study of steel frame structure engineering.The calculation results show that the carbon emissions in the manufacturing stage,installation stage and dismantling stage of steel structure engineering account for about 47%,22% and 31%of the total life cycle carbon emissions.