Analysis Of Single Layer Spherical Reticulated Shell Structures For Resistance To Progressive Collapse

Reticulated shell has been used widely in engineering because of its beautiful shape, reasonable force and large indoor space. But reticulated shell may occurs local damage when subjected to accidental load in the process of use. It’s a question whether the damaged structure can carry on without collapse or guarantee the required evacuation time for people in buildings. This issue is paid more and more attention by people.At present, the research on the progressive collapse in our country is mainly focused on the frame structure, which is still in the initial stage for the collapse of large span spatial structure. There are many types of shells, which have different characteristics, stress mechanism and performance. Therefore, it is urgent to improve the research of its ability to resist progressive collapse Compared to double layer reticulated shell, the single layer reticulated shell has low redundancy and the ability to resist progressive collapse is weak. When the structure is partially damaged, it is likely to cause the progressive collapse. So it has theoretical significance and engineering application value to study the progressive collapse resistance of the single layer spherical reticulated shell structures.For research the resistance capacity to progressive collapse of single layer spherical reticulated shell structures, using the alternate path method, this paper has studied the sensitivity analysis of the bars and nodes of 40 m span and different rise-span ratio of lamella structure with the help of ansys finite element analysis software to find out the highest sensitive bars and nodes which is mainly located in the middle and lower part of the structure. Based on the sensitivity analysis and combined with structural progressive collapse assessment criteria, this paper studied the double nonlinear buckling analysis of the lamella shell with span of 40 m, 50 m, 60 m and rise-span ratio of 1/3, 1/5, 1/7 under the vertical load and wind load respectively to explore and study the structure of the progressive collapse mechanism and the ability to resist progressive collapse. The structure in the span of 40 m and the rise-span ratio of 1/5 has a good ability to resist progressive collapse.