A Structural Reliability Analysis Method Based on Target-oriented Krill Herd Algorithm

摘要

This paper proposes TOKH, which is used to balance theexploration and exploitation of KH. The krill population isartificially divided into large krill population and small krillpopulation. The large krill is mainly responsible for exploration.Its effect is the same as KH krill, which retains the originalstrong exploration ability of KH. Small krill is mainly exploitedin the better areas where large krill has been explored, lookingfor better solutions and making up for the shortage of KHexploitation. At the same time ,the best large krill and food arecrossed to produce a better solution and speed up convergence.The proposed algorithm, combine with FORM method, is usedto the analysis of structural reliability. Results show it issuccessful to use the TOKH to determine the reliability indexand the failure point, then comparison with the response surfacemethod and Monte Carlo simulation is quasi-accurate. Inaddition to the good quality of the TOKH results, thismethod is easy to implement because it is a zero-ordermethod, which means no need to calculate the derivative.Since the solution reliability index has constraints, the limitstate function is combined with the penalty equation toconstruct the objective function, which improves theefficiency and reliability of the algorithm to converge on thereliability index.