Reliability Design of Crane Lattice Jib Based on Response Surface Method

Ge Ning Xu; Jun Liu; Ge Zhang

doi:10.4028/www.scientific.net/AMM.687-691.243

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 687-691Reliability Design of Crane Lattice Jib Based on...

Reliability Design of Crane Lattice Jib Based on Response Surface Method

Abstract:

The failure path of large complex steel structure systems for lattice jib cranes is investigated in this paper. Considering the lack of an explicit function expression in the study of reliability, a method based on a modified response surface method is proposed to quantify the reliability index and the failure probability, capitalizing on the linear-approximated iteration and the difference approach rather than the differential approach in solving nonlinear equations. The major failure path is determined through the analysis of the multiple failure probabilities. The main failure mode of lattice jib cranes is a failure in stability, not a failure in strength based on a comparison of the failure probabilities of both stability failures and strength failures. And the failure path is substantially a rearrangement of the hazardous components and the failure path of components with similar probabilities and close locations varies only in that these components break at distinct starting positions. Finally a proposal is put forward to heighten in engineer practices the security reserves of hazardous components to achieve high reliability of an overall system.