Stability optimization of grid shells based on regional sensitivity differences

To improve the reliability of the stability and bearing capacity of grid shells, we proposed a novel sequential two-level stochastic optimization based on the regional sensitivity difference (SRSD) for obtaining a structure with a low sensitivity to imperfections. The stable bearing capacities obtained by this method and the conventional method were compared. The minimum ultimate buckling load obtained using the former method was found to be larger with a lower coefficient of variation. Thus, this structure has a higher stable carrying capacity and lower sensitivity. Moreover, applying the SRSD method is efficient and convenient for unskilled designers.

Automated summary

In this study, a novel optimization method was proposed to improve the stability and bearing capacity of grid shell structures. By comparing with the conventional method, it was found that the proposed method resulted in higher stable carrying capacity and lower sensitivity. Moreover, this method is efficient and convenient for unskilled designers.