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Seismic Vulnerability And Probability Risk Assessment Of Single-layer Cylindrical Aluminum Alloy Reticulated Shell Structure

Posted on:2021-01-25Degree:MasterType:Thesis
Country:ChinaCandidate:S J ZhengFull Text:PDF
GTID:2392330611954390Subject:Architecture and civil engineering
Abstract/Summary:PDF Full Text Request
As one of the main structural forms of large-span space grid structure,reticulated shells have the characteristics of reasonable overall stress,large covering space,beautiful building shape,and economic material consumption.Since the 1980 s,the reticulated shell has been widely used in the infrastructure such as comprehensive sports center,exhibition center,large-scale transportation hub station and terminal,cluster industrial workshop,etc.it has become a landmark building in a region or even a country,with very important political and economic significance.Large span space grid structure,because of its good seismic performance,can generally withstand the test of strong earthquake action,and often becomes a shelter after the earthquake.However,there are also some reticulated shell or grid structure damaged or even collapsed in varying degrees.Due to the importance and particularity of landmark buildings,if the space latticed shell structure is damaged,its economic and social impact is very huge.Aluminum alloy materials are widely used in industrial and civil buildings because of the light weight,high strength,good corrosion resistance,low maintenance cost,strong plasticity and recyclability.At present,the research on seismic performance of aluminum alloy reticulated shells is relatively limited,which seriously restricts the development ofaluminum alloy reticulated shells.Therefore,based on the previous research results of seismic performance of reticulated shell,this paper takes single-layer cylindrical aluminum alloy reticulated shell as the research object,and carries out the research on the failure mechanism under severe earthquake,seismic vulnerability and seismic probability risk assessment of aluminum alloy reticulated shell.The main research contents are as follows:(1)Failure mechanism of single-layer cylindrical aluminum alloy reticulated shells under severe earthquakesIn this paper,the finite element analysis model of single-layer cylindrical aluminum alloy reticulated shell is established by the finite element analysis software ABAQUS.The whole dynamic process of the structure model under severe earthquake is analyzed by using the incremental dynamic analysis method(IDA).On the basis of two failure modes of aluminum alloy reticulated shell,the loss of single-layer cylindrical aluminum reticulated shell is obtained by combining the fuzzy mathematics discrimination method Based on the theory of structural damage,the damage factors of single-layer cylindrical aluminum alloy reticulated shell are fitted.(2)Seismic vulnerability analysis of single-layer cylindrical aluminum alloy latticed shellsIn this paper,the analysis principle and steps of structural seismic vulnerability are described.Through a large number examples,the structural damage factors are fitted,and the different damage states of the structure are divided hierarchically.Through random sampling,a certain number of structural samples are selected,and 40 seismic waves and structural samples are selected to form random ground motion samples.Finally,based on the results of numerical analysis,the seismic vulnerability function is established by regression analysis,The seismic vulnerability curves of single-layer cylindrical aluminum alloy reticulated shells are obtained.(3)Seismic probability risk assessment of single-layer cylindrical aluminum alloy reticulated shellsIn this paper,the seismic risk assessment method and analysis steps of single-layer cylindrical aluminum alloy reticulated shell are described firstly,and the seismic probability damage analysis,economic loss and casualties estimation of single-layer cylindrical aluminum alloy reticulated shell are carried out.Finally,taking a 20 m-span single-layer cylindrical aluminum alloy reticulated shell as an example,the total investment of structure life cycle is calculated by comparing different design schemes,and the optimal design scheme of total investment is given according to the results of seismic probability risk assessment.
Keywords/Search Tags:Aluminum alloy, Single-layer cylindrical reticulated shell structure, Failure mechanism, Vulnerability, Seismic probability risk assessment
PDF Full Text Request
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