Non-probabilistic reliability optimization design method for structural system

Abstract

The invention discloses a non-probabilistic reliability optimization design method for a structural system. The non-probabilistic reliability optimization design method for the structural system comprises the following steps that (1) based on a safety factor design method, a design scheme of the structural system with a given safety factor is optimized; (2) based on quantitative results of uncertain sources in the structural system, dispersity of response of the structural system under multiple failure modes is obtained by an interval uncertainty analysis; (3) a non-probabilistic reliability index is introduced to calculate the reliability of the structural system under the multiple failure modes; (4) a non-probabilistic reliability optimization design model is established under the constraint of a non-probabilistic reliability or a given reliability of a safety factor scheme; (5) based on a conventional optimization algorithm to solve an optimization problem, the design scheme of the structural system with optimal reliability allocation is obtained. According to the non-probabilistic reliability optimization design method for the structural system, on the basis of ensuring the non-probabilistic reliability of the safety factor design scheme, the quality of the structural system is further reduced and the performance of the structural system is improved.

Description

technical field [0001] The invention relates to the field of reliability design of structural systems, in particular to a non-probability reliability optimization design method of structural systems. Background technique [0002] In the design and optimization process of conventional engineering structure systems, the load environment, structural parameters and design requirements of the structure are all processed in a deterministic form, which simplifies the design process of the structure to a certain extent and reduces the calculation workload. However, uncertainties widely exist in practical engineering applications, including uncertainties in material parameters, uncertainties in loads, uncertainties in geometric dimensions, uncertainties in initial conditions and boundary conditions, and uncertainties in calculation models. The determined parameters will affect the structural performance, affect the normal use of the structural system, and even cause unexpected struct...

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Problems solved by technology

However, uncertainties widely exist in practical engineering applications, including uncertainties in material parameters, uncertainties in loads, uncertainties in geometric dimensions, uncertainties in initial conditions and boundary conditions, and uncertainties in calculation models. The determined parameters will affect the structural performance, affect the normal use of the structural system, and even cause unexpected structural damage and failure under certain conditions

Traditional engineering structural system analysis and design methods generally make a rough integrated estimate of uncertainty through the safety factor design method, which cannot quantitatively express the influence of uncertain factors, which is incompatible with the refined design concept of advanced structural systems

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