In order to study the low-carbon construction of composite bridges and provide practical and reliable carbon reduction guidance, the carbon emissions model of this type of bridge was established and analyzed. Firstly, considering the boundary impact of carbon emission calculation during construction period, the construction period is divided into three stages: production processing, material transportation and mechanical construction according to the time series. Based on the characteristics of the bridge project based on carbon emissions and economic costs, the factor decomposition theory and carbon are applied. The emission factor method established a carbon emission model for composite bridges. Secondly, this paper uses the model of this paper to analyze the engineering application of the steel plate composite girder bridge under construction. Through the construction drawings, engineering quantity list and pricing document, various carbon emission factors are determined, and the carbon emissions of the whole bridge structure are calculated and compared. Finally, the uncertainty of the influencing factors in this carbon emission model is considered, and the parameter sensitivity analysis is carried out. The research results show that the carbon emission during the construction period of the steel plate composite beam is mainly from the superstructure; in the construction phase, it mainly comes from the production stage; the carbon emission parameter sensitivity order of the steel plate composite beam during the construction period: steel carbon emission factor> Cement carbon emission factor > diesel carbon emission factor > electricity carbon emission factor.

CICTP