Research On Design And Construction Method Of Assembled Arch Bridge By 3D Printing

The construction industrialization is an important direction of the development of the construction industry.3D printing concrete technology is helpful to the development of building industrialization because of its advantages such as no template,high precision,green,favorable to special-shaped and non-standard geometric structure forming.The archaize building has the characteristics of art and practicality,and it is a good cultural heritage medium.Therefore,the use of concrete 3D printing means to achieve new construction of ancient bridges,while inheriting traditional culture,through the application of concrete 3D printing in the field of bridges to achieve technical innovation.At present,the application of 3D printing in the field of highway and municipal bridge is just starting,and there are few engineering examples,so it is necessary to study the application of related technologies in bridge engineering.3D printing segments/sub components form large-scale structure through assembly connection,which can greatly expand the space scale and construction speed of concrete 3D printing buildings.This paper introduces the design and construction process of an assembled 3D printed concrete arch bridge in detail,and puts forward solutions to the key problems in the design and construction.Combined with the construction process and the monitoring data in the completed state,Midas/Civil finite element software is used to analyze the mechanical performance of the key components of the open shoulder arch bridge in the construction and use process,and the following research work is carried out specifically:(1)In this paper,the method of splitting the superstructure of 3D printing concrete arch bridge is studied.Combined with the mechanical characteristics of the main arch,the abdominal arch and the buildings above the arch bridge superstructure,the form of each part of 3D printing shall be reasonably designed to meet the applicability of the 3D printing concrete components and clarify the mechanical characteristics.The main arch is designed to achieve 3D printing of concrete for long-span and wide bridges through longitudinal3-segment splicing and transverse arch ring prestressed connection,to ensure the stability and durability of transverse connection.(2)In this paper,the stress-strain and deformation characteristics and evolution law of the main arch with long and thin special-shaped catenary in each construction stage are studied.The Middas/Civil finite element three-dimensional model in different construction stages is established,the monitoring data of construction process is extracted and captured in real time,and the stress and deformation of the main arch in the construction stage are analyzed.The analysis results show that the structure meets the requirements of the construction state,and the hoisting method and process of the main arch are optimized,and the construction control theory and basis are established.(3)Combined with the current relevant specifications,the bearing capacity and deformation of the completed bridge are studied and checked.Through the finite element analysis of the stress characteristics of the key position of the completed bridge,the bearing capacity and serviceability are checked.The research results of this paper not only provide reliable technical support and theoretical basis for the design and construction of this project,but also provide empirical methods and scientific reference for the design of similar bridges in the future.