The Resistance Analysis Of Single-layer Latticed Shell Progressive Collapse

In this paper, single-layer reticulated shell structures of the resist progressive collapsed analysis in this paper. Using eigenvalue buckling analysis, nonlinear static solving method of calculating nets shell structure, it is concluded that the sensitivity SI of various rods of single-layer reticulated spherical shell, analysis showed that, through calculation the important components of the shell structure. Examples of a project and then to resist progressive collapse analysis, calculated by removing an important component to determine the structure of anti-collapse capabilities. On this basis, discuss effective measures to prevent progressive collapse, such as by strengthening the bar method to reduce the sensitivity of the structure of the value of bar to improve the integrity of shell structure, continuity and reduce the probability of structural collapse.The first two chapters of this paper reviews the development of progressive collapse, citing three influential continuous collapse of buildings, described the collapse of domestic and international research on the continuity and application specifications. For net shell structure of the widespread application, the urgent task of shell structures is to control the structure collapse. In order to ensure sufficient safety margin of shell structure, the introduction of structural redundancy and component sensitivity and other new concepts. Chapter III of the project are often used in the K6-type single-layer spherical shell of sensitivity calculated by the sensitivity value of each bar size, in a different span and sagittal specific to find distribution, demonstrated high sensitivity in the eigenvalue distribution of bar buckling response of a large area. Then analyzes the associated rib ring and square single spherical shell, proved highly sensitive bar located in the eigenvalue buckling response of a large area is universal.Chapter IV of the single-layer reticulated shell structures collapse failure to determine, analyze a structural model of the sensitivity of the top lighting, demolition of important components to resist progressive collapse analysis. When the removal of one or more roots of the shell bars which are higher sensitivity, calculation the ultimate bearing capacity of the remaining structure, discuss on the influence of continuity collapsed for the removal of components of the shell structure, and the extent of the damage that can be achieved.Chapter V of the improved the ability of measures for collapsed of single-layer reticulated shell structures, mainly by controlling the accident, the reasonable adjustment of shell structure, shell selection and change the structure of measures aspects. In the prevention of progressive collapse of structural measures mainly study the increasing the section size of components method, through the skylight structure of the section bars of different size change, come to choose a reasonable approach which is conducive to the structure to resist progressive collapse.