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Structural Reliability Computation Based on Kriging Model

WANG Bao,SUN Qin(School of Aeronautics,Northwestern Polytechnical University,Xi'an Shanxi 710072,China)  
In large structural reliability analysis,the limit state function is implict and high nonlinear.Generally,a response surface of a polynomial function is used to approach to the implict limit state function.Because the form of polynomial function is fixed,which restricts the accuracy of reliability analysis.An approved Kriging model is proposed in this paper.Regression part in Kriging model is expanded at design point to linear terms and quadratic terms by Taylor serial,and the differential is replaced by the difference.Limit state function is approached by improved Kriging model,and structual reliability is computed by H-L method.As a result,least squares estimation is avoided.The numerical experiments show that the result computed with the method is very accurate,what's more,it needs less sample points.
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