On the other hand, Figure 8 shows that for the impact event with the impactor of 10m diameter, every segment of this structure happens to the deformation in light of the observation of the strain energy, and the strain energy of the C2 has a dramatic increase and the peak is relatively large; this leads more us to get the conclusion that the members of the C2 are broken during the impact process. This furtherly indicates that the deformation of the impact event with the impactor of 10m diameter is global. Finally, comparisons of the strain energy on two typical impact events prove again that the impactor size has an important effect on the damage mode of the reticulated dome.Figure 8Time history of strain energy on two typical impact events with two different impactors and the same initial striking kinetic energy.

5. Property Effect of the ImpactorIn Section 4, size effect of the impactor was analysed, where the impactor was assumed to be rigid. The material property of the impactor was ignored. But in reality the deformable impactor was common; it is necessary to investigate the dynamic response of the dome structure subjected to the deformable impact.Thus, in this section, the work on the deformable impact was approached. The material property is kept the same with that of the dome structure. The mass of the impactor is changed by adjusting the geometry parameters. The detailed information on the deformable impactor is given in Table 2.Table 2Deformable impactors analysed.As described in Section 3, the damage modes of the dome structure against to the deformable impact are similar to those of the rigid impact.

The final analytical results are given in Figures Figures99 and and10.10. It is found that for the dome structure with the roof load of 60kg/m2, there is no difference between the rigid impact and the deformable impact. But, when the roof load is 120kg/m2, the distribution Carfilzomib of the damage modes happens to the change: the area of the global damage mode becomes larger than that of the rigid impact. Figure 9Comparison of the impact events with the roof load of 60kg/m2 between the rigid impact and the deformable impact.Figure 10Comparison of the impact events with the roof load of 120kg/m2 between the rigid impact and the deformable impact.Aiming to check the reason resulting in the difference, two typical cases were discussed, where the roof load was 120kg/m2, and the mass and the striking velocity are 10T and 90m/s, respectively; the corresponding geometry parameters can be gained in Table 2. Figure 9 shows that at this kind of initial striking condition the case with the rigid impact is corresponding with the local damage mode; reversely, the case with the deformable impact is characteristic of the global damage mode.