Research On Bionic Design Of Arch Bridge Based On Turtle Shell

Bionics brings new ideas and methods to bridge design and helps promote innovation in bridge design forms.The turtle shell structure was selected as the research object of the bionic design of the arch bridge.From the related bionic literature of bridges,so far,no scholar has conducted in-depth research on bionic arch bridges.Therefore,it is of great significance to study the bionic design of arch bridges based on turtle shells.The purpose of this study: Fully reveal the mechanical properties of the turtle shell structure;Combining the research of turtle shells and arch bridges to provide later researchers with ideas and methods for bridge bionics research;Through the bionic design,a new type of cross section of the bionic arch bridge is designed;Further optimize and improve the traditional reinforced concrete arch bridge,reduce material loss,increase structural rigidity,and enrich the structural form of the arch bridge;Promote the formation of new ideas for bridge design development-bridge bionics.The main research contents and results of this article are:(1)The theoretical analysis is used to study the turtle shell structure and material mechanical properties,and the possibility of designing bionic arch bridges for the turtle shell structure is discussed.The conclusions are as follows: The vertebrae,ribs,stiffeners,and layered structure in the turtle shell structure make the turtle shell structure have a large compressive bearing capacity;Starting from bionics,the turtle shell structure has great research value,especially on the structure that mainly exerts the advantage of compressive bearing capacity.(2)The point cloud data of the turtle shell was obtained through industrial CT equipment,and the surface reconstruction of the turtle shell was realized using reverse engineering technology and a three-dimensional solid model was generated.A 3D printer was used to print a three-dimensional model of the turtle shell.The pressure load test on the 3D printed turtle shell and the solid turtle shell was used to measure the relationship between the shell load and the strain and deflection.The macro-and micro-level observations of the material structure of solid tortoise shells were conducted to explore the mechanical characteristics and tolerant loading modes of tortoise shell structures.The conclusions are as follows: The head deformation of the turtle shell structure is smaller than the tail;Reinforcement ribs are a key part of the integrity of the turtle shell structure;The overall deformation and coordination of the turtle shell structure under load,the ribs and vertebrae effectively protect the internal organs of the turtle shell,etc.;Turtle shells are composed of different layered structures.There are obvious seam structures in the carapace of the turtle shell.There are narrow channels in the ribs and vertebrae,which can be used to transport nutrients.(3)The numerical analysis of the complete model of the turtle shell was realized using ABAQUS software.Through topology optimization technology,the Optimization module in ABAQUS optimized the turtle shell structure.On this basis,the bionic design of the arch bridge is carried out.The conclusions are as follows: The structural characteristics of turtle shells are basically consistent with the results of mechanical tests on turtle shells.The topology optimization shows that the partial structure of the tortoise shell bridge,the tail of the carapace,and the position of the head have little effect on the compressive bearing capacity of the tortoise shell during loading;Based on the structural characteristics and mechanical characteristics of the turtle shell structure,a new bionic design scheme for arch bridge sections was proposed.(4)Relying on engineering examples,two types of bionic arch bridge structures and conventional arch bridge structure models were established,and the model volumes were compared.The ABAQUS software was used for analysis,and the deflection and stress changes of the three structures under normal and eccentric load were compared.The real bridge load was applied to the bionic arch bridge structures 1 and 2,and the changes in cross-section stress,strain,and deflection of the two bionic arch bridge structures were compared and analyzed.The conclusions are as follows: Comparing the two bionic arch bridge models with conventional arch bridge models,the volume is reduced by 2.83% and 3.36%;Under the unit load,the stiffness and bearing capacity of the bionic arch bridge are better;Under the actual structural load,the stress,strain,and deflection of the two bionic arch bridge structures can meet the structural load and deformation requirements.This article studies combining bionics with bridge design.The research results provide basic research methods and ideas for researchers conducting bridge bionic design.The research results are conducive to promoting the innovation of bridge design forms and the development of bridge bionics.The research results have certain theoretical research and engineering application value.