A numerical simulation model for calculating the dynamic responses of the large-space steel reticulated shell under inner-blast loading was established by employing fluid-structure coupling algorithm LS-DYNA.The problems of spatiotemporal asynchrony of shock waveforms and pressure distributions on large-space structure surface were solved by extracting the shockwave overpressure data of the finite points on the structural surface and using the proper orthogonal decomposition(POD) method.Using Ritz-POD method

the numerical simulation of dynamic responses of the large-space single-layer steel reticulated shell under internal explosion was carried out.The influence of the height of structure

the ratio of rise to span

the TNT equivalence of dynamite and the position of explosion on the dynamic responses of the structure was analyzed. The numerical simulation results show that the maximum displacement and the maximum stress responses of the large-space steel reticulated shell under inner-blast loading nonlinearly develop with the increase of the TNT equivalence of explosive

the stress response develops proportinally and the displacement response rapidly.The results also show that the damages to the structure caused by eccentric blast shock waves are more serious than that caused by central explosion and the blast shock waves are most disadvantageous to the edge components of the structure.The conclusions have reference value for the anti-explosion design of the large-space steel reticulated shell.