Cost Estimation Method For Steel Plate Composite Beams And Comparative Study With Bridge Type

This thesis focuses on the steel plate composite beam,which has broad prospects in the construction of small and medium-sized span bridges due to its efficient force bearing,simple structure,flexible construction organization design,and easy assembly construction.The main research object is to evaluate its technical and economic performance,and to assist in its nationwide promotion and application.Through methods such as data collection,data calculation,and regression analysis,the construction cost of the steel plate composite beam is calculated,and regression proposed its construction and installation cost estimation formula;laying a data foundation for its technical and economic analysis.On this basis,a comparative study was conducted between steel plate composite beams and prefabricated prestressed concrete beams based on indicators such as construction and installation fees,full life cycle construction and maintenance costs,and carbon costs during the construction period.Comparative principles for small and medium-sized span bridge types were proposed and recommended selection was given;Based on the concept of sustainable development and considering different costs throughout the entire life cycle,a qualitative classification method and corresponding evaluation indicators for bridges have been proposed.The main research contents are as follows:(1)Based on literature research and drawing collection,the design differences of four volumes of the General Atlas of Steel Plate Composite Beams,including the Ministry of Transport,Shaanxi Province,Zhejiang Province,and Chongqing City,were sorted out,and the standardization of steel plate composite beams was analyzed;On the basis of compiling the budget quota for steel plate composite beams,the construction and installation costs of steel plate composite beams were calculated.Through data analysis,a ratio coefficient of 1.66 was proposed to determine the relationship between material costs and construction and installation costs;Considering the changes in labor and steel prices,a formula regression was performed on the value of this coefficient,expanding its applicability;The variation of construction and installation fees for steel plate composite beams was analyzed with the bridge deck width as the control factor.(2)Through data calculation,a comparison was made between the construction and installation costs of steel plate composite beams and prefabricated prestressed concrete beams.It was found that when only considering the construction cost,the economic performance of steel plate composite beams is slightly worse than that of T beams and small box beams.However,in expected scenarios such as rising labor prices,high-performance material applications,and special construction scenarios such as high mountains,canyons,and Tibet Plateau,the technical and economic performance of steel plate composite beams will be better than that of concrete beam bridges;Adopting reasonable calculation assumptions and parameters,considering different stages of the life cycle,the full life maintenance cost of each bridge type was predicted.When the full life maintenance cost is used as a comparative indicator,the technical and economic performance of steel plate composite beams will also be better than that of concrete beam bridges.(3)Considering the environmental impact of engineering activities,the calculation indicators,tools,and scope of environmental costs for different bridge types have been clarified;Based on budget quotas,statistics were conducted on the consumption items and their lists during the construction phase of the project,reasonable carbon emission factors were selected,and the carbon emissions during the construction period of each bridge type scheme were calculated.Based on this,a certain carbon pricing mechanism was used to cost it,and the conclusion was drawn that the environmental impact of steel plate composite beams is smaller;Based on different construction conditions and cost analysis,three principles for bridge type comparison and selection were proposed: minimum construction and installation fee,minimum carbon emissions,and minimum full life cycle cost.(4)Based on the concept of sustainable development in engineering,considering construction and maintenance costs,environmental costs,and user costs,a bridge classification method that qualitatively divides bridges into four categories is proposed,and its applicable scenarios and evaluation indicators are pointed out for each type of bridge;A suggestion was proposed to introduce the American ABC rapid construction method comparison and selection approach in bridge categories that focus on user costs.The feasibility and effectiveness of this suggestion were discussed through case analysis.