Research On Performance And Safety Monitoring Technology Of The Large-span Aluminum Alloy Dome Structure

Aluminum alloy material has been widely used in the construction engineering for its characteristics of light weight,corrosion resistance,easy processing,and beautiful shape.Although the structure of aluminum alloy has been increasing in recent years,it is still not common in the large span structure due to its unique properties.This paper takes Nanjing Niushoushan Garbhadhatu palace dome as the engineering background,structure performance of Aluminum alloy single-layer reticulated shell is analyzed by ANSYS,according to the characteristics of the structure,the results of finite element analysis and design of safety monitoring system.This paper studies safety monitor:ing technology of Aluminum Alloy structure,and reveals the relationship between the structure properties and temperature during the normal use of structure combining with the mathematical method,which provides a scientific basis for the design and monitoring of this kind of structure.First of all,the ANSYS finite element model is established based on the finite element analysis criterion of Aluminum Alloy structure.Then the paper analyzes the static and dynamic performance of the model,considering two kinds of working conditions which are whether temperature effect participates in the combination.After that,studies nodal displacement,bar stress,frequency and vibration of large span reticulated shell Aluminum Alloy.Secondly,the paper determines the node with larger displacement,larger stress bar and large vibration node according to the ANSYS analysis results of finite elements,and designs safety monitoring system during the normal use of the structure based on the safety monitoring design method of hollow type long-span Aluminum Alloy single-layer latticed shell structure.Combined with the structural characteristics and finite element analysis,the paper determines the monitoring content,the selects test instruments and monitoring rod,designs corresponding monitoring program,uses the reasonable data acquisition system,constitutes safety monitoring system of a large span reticulated shell Aluminum Alloy during normal use.Thirdly,the mathematical statistics method is used to analyze the rule of structural deformation,member force and structural frequency with the change of temperature.The paper summarizes the member stress variation based on the time-history analysis of the monitoring data,and proposes the method which is used to eliminate the temperature stress,and analyzes the limitations of single point test,providing a reference for the safety monitoring system in long-span Aluminum Alloy structure.Fourthly,in order to eliminate the influence of the temperature field,the monitoring results of the night under the same temperature should be compared with the ANSYS finite element calculation results,and the comparison results show that the method can simulate the actual stress state of the structure well,and the results are close to monitoring data.At the same time,the paper compares the frequency of structure,and the results show that the finite element model can simulate the vibration characteristics of structure well,so the monitoring programs designed by finite element model is guaranteed to be reliable,and the monitoring data is guaranteed to be effective.Finally,suggestions on design method,structure design,monitoring equipment selection,monitoring content selection and monitoring data processing are proposed according to the research results of the structure on deformation of structure,member stress and structure dynamic response.Besides,the paper summarizes the research contents.and main achievements,and put forward its own views and outlook on the insufficient of research on long-span spatial structure.