Seismic Vulnerability And Probability Risk Assessment Of Single-layer Spherical Aluminum Alloy Lattice Shell Structure

As a kind of sudden and destructive natural disaster,earthquake will cause serious damage to the structures,produce incalculable casualties and economic losses,and seriously affect people's life and social and economic development.In recent years,as a main form of large-span spatial structure,reticulated shell structure has been widely used in large public buildings such as exhibition center,stadium,railway station,airport waiting hall,as well as shopping malls,dance halls and other densely populated places.Once damaged,it will cause serious loss of life and property and significant social impact.Therefore,it is very important to study the seismic theory and seismic risk assessment of reticulated shell structure.In recent years,the research on seismic theory of long-span steel latticed shell in China has made a lot of achievements,while the research on aluminum alloy latticed shell which is also widely used is relatively less.Compared with traditional steel,aluminum alloy has the advantages of light weight,high strength,good moldability,good ductility and corrosion resistance.Therefore,aluminum alloy materials are widely used in industrial and civil buildings.At the same time,because of the large amount of construction work,more capital investment and high cost of repair after damage,it has become an important topic in the field of space structure to carry out seismic probability risk assessment for the latticed shell structure and reduce the loss caused by the earthquake as much as possible.Therefore,in this paper,seismic vulnerabilityanalysis and seismic probability risk assessment of single-layer spherical aluminum alloy latticed shell structure are carried out.The main contents are as follows:(1)Failure mechanism of single-layer spherical aluminum alloy latticed shell under strong earthquakeIn this paper,the finite element analysis software ABAQUS is used to study the failure mechanism of single-layer spherical aluminum alloy latticed shell structure under strong earthquake,and the failure mode of single-layer spherical aluminum alloy latticed shell structure under strong earthquake is discussed;the failure mode of single-layer spherical aluminum alloy latticed shell structure is quantitatively determined by using the fuzzy comprehensive judgment principle of fuzzy mathematics,and the loss of single-layer spherical aluminum alloy latticed shell structure based on this method is established Combined with the calculation example of single-layer aluminum alloy spherical lattice shell structure,the traditional experience failure mode and fuzzy mathematics comprehensive judgment are carried out for the failure mode,and the accuracy of the failure mode judgment criteria of single-layer aluminum alloy spherical lattice shell structure is verified by comparative analysis.(2)Seismic vulnerability analysis of single-layer spherical aluminum alloy latticed shell structureBased on the statistics of structural characteristic response in large-scale parameter analysis,this paper puts forward the seismic damage model of single-layer spherical aluminum alloy latticed shell structure,discusses the standard of seismic damage classification suitable for single-layer spherical aluminum alloy latticed shell structure,and gives the basic steps of seismic vulnerability analysis of single-layer spherical aluminum alloy latticed shell structure On this basis,the seismic vulnerability analysis of three kinds of kaiwitt single-layer spherical aluminum alloy reticulated shell structures is carried out,and the seismic performance evaluation and seismic vulnerability curve of the aluminum alloy reticulated shell structure are obtained,which provides the basis for the seismic design theory of single-layer spherical aluminum alloy reticulated domes.(3)Seismic risk assessment of single-layer aluminum alloy reticulated domesIn this paper,the theory and method of structural seismic risk assessment are systematically summarized,and the seismic risk analysis,structural vulnerability analysis,earthquake probability damage analysis,casualties and earthquake economic loss estimation of single-layer spherical aluminum alloy reticulated domes are carried out by using this theory.Taking the aluminum alloy latticed shell structure of a gymnasium as the research object,the seismic risk assessment is carried out,and the structural design scheme with the least total cost in the whole life cycle of the gymnasium is obtained,which embodies the engineering significance of the structural seismic risk assessment and provides the basis for the seismic design method based on the behavior.