Failure Criterion Of Single-layer Saddle-shaped Reticular Shells Subjected To Strong Dynamic Loads

As the main form of the large-span spatial structures, the reticular shells have distinct characteristics in dynamic performance compared with multi-storey and high-rise buildings. The single-layer saddle-shaped reticular shells, for their beautiful shape and convenient construction, have been widely applied in recent years, and their seismic performances are paid more and more attention. By the FEM software ANSYS, a full course dynamic response analysis method based on time-history calculation is performed in this paper to study the dynamic damage characteristic of single-layer saddle-shaped reticular shells subjected to harmonic loads with different frequencies and earthquakes with different types of seismic waves. The diversity of height-span ratio, span, grid form and roof loads of the shells is considered in the research. Using the pattern of double-parameter failure criterion of building structures, based on numerical simulation results, a double-parameter criterion of dynamical strength failure is constructed by combination of maximum displacement and total strain energy into dynamical failure index to quantify the different level of dynamical strength failure for single-layer saddle-shaped reticular shells. Compared with previous dynamical failure criterion, the double-parameter criterion and dynamical failure index are more reasonable and effective. Furthermore, a correlation between dynamical failure index and limit displacement is achieved in a certain range.