Structural Reliability Analysis Method Research Based On Real-time Substructure Test Guided Sequential Sampling

Structural reliability analysis has important research significance in engineering,which can explore and evaluate the safety performance of structures or systems.Uncertainty exists widely in practical engineering,usually from the inherent random changes related to the structural system itself or the environment,which has an unavoidable impact on the performance and reliability of the structure or system.Therefore,considering the influence of the structure or system itself and the environment,it is very important to study the reliability of engineering structures under uncertainty.This paper adopts a combination of theory,simulation and experiment,based on surrogate model,combined with real-time sub-structure test,to propose a new structural reliability analysis method of guided sequential sampling,and carry out experimental analysis and verification.The main work is as follows:(1)Starting from the structural reliability analysis method of the adaptive surrogate model currently studied,the method is optimized based on the AK-MCS method,and the Kriging and PC-Kriging methods are combined.A adaptive structural reliability analysis method based on ensemble learning-surrogate model and an adaptive structural reliability analysis method of multiple learning functions are proposed,and three calculation examples are analyzed to compare the accuracy and efficiency of the methods,and verify that the proposed methods are It can improve the analysis efficiency of structural reliability while ensuring accuracy;(2)The real-time substructure test is used to replace the numerical simulation part required in the traditional surrogate model-based adaptive reliability analysis method to improve the real accuracy of the structural response.Combined with the two newly proposed reliability analysis methods,A new structural reliability analysis method based on real-time substructure test guided sequential sampling is established.Taking a structure with two degrees of freedom as an example,the limit state of the structure is established,the real-time substructure test simulation is carried out,obtain real structural failure probability through Monte Carlo simulation.Compared with the analysis results obtained by the proposed structural reliability analysis method based on real-time substructure test-guided sequential sampling,the feasibility of the method is preliminarily verified;(3)A single-story shock-absorbing frame structure is selected for real-time substructure test.Under ground motion excitation,the proposed two structural reliability analysis methods based on real-time substructure test-guided sequential sampling are used to carry out structural reliability analysis.The feasibility of the method is verified by randomly selecting sample points for testing and comparing with the predicted results.