Regarding typical structural characteristics of radius and thickness of diaphragms

height and angle of cone section

a method was built to compute the buckling load of diaphragms based on Kriging metamodel.The Kriging metamodel was validated by typical samples.Research results show that:for the Kriging metamodel based on Cubic correlation function

the error percentage to compute buckling loads at untried inputs is less than 5%

more suitable for computing the buckling loads of spherical-cone diaphragms than that based on Gauss correlation function;the metamodel could precisely compute buckling loads at untried inputs

without need of modeling and simulation by finite element method;the metamodel could compute parameter values of typical structural characteristics according to a set buckling load

and also could be used as bound function or object function for structural optimization design of spherical-cone diaphragms.