Wind-Induced Dynamic Collapse Analysis of Single-Layer Cylindrical Reticulated Shells Considering Roof Slabs and Support Columns

摘要

Long-span lightweight single-layer reticulated shell structure as a typical wind-load-sensitive structure, Wind load is the main control load of its structural design, and unfavorable wind load distribution is likely to cause it to collapse. Considering buckling of compression members and successive failure of tension members, a numerical analysis model of global dynamic collapse of single-layer cylindrical reticulated shell structure with roof panels and support columns is established by using the finite element explicit analysis software and self-compiled pre-post-processing program. The internal forces of members, the maximum displacement of nodes and the deformed configuration of structure are taken as the characteristic responses, the collapse process and the collapse mechanism of reticulated shell are analyzed from different angles. The quantitative effects of roof panels and support columns on the wind-induced dynamic collapse of reticulated shell structure are investigated. The analysis results show that the critical load factor corresponding to the dynamic collapse of reticulated shell structure without roof panels has a significant decrease of about 20%, and the time of dynamic collapse of reticulated shell structure is obviously advanced with support columns. It is necessary to consider the influence of roof panels and support columns in the dynamic collapse analysis of reticulated shell structure under wind loads. Otherwise, the safety assessment of reticulated structures under wind loads will be uncertainties. Based on the research results, some conclusions are suggested for the engineering design and wind-resistant and disaster-prevention of single-layer reticulated shell structures.