Static and dynamic hybrid uncertainty-oriented non-probabilistic reliability optimization design method for ready-built structure

Abstract

The invention discloses a static and dynamic hybrid uncertainty-oriented non-probabilistic reliability optimization design method for a ready-built structure. According to the method, multisource uncertainty conditions in an actual engineering structure are comprehensively considered, a quantitative index for effectively assessing the safety performance of the structure in a full-life period by static and dynamic hybrid uncertainty parameters is established, and the non-probabilistic reliability optimization of the ready-built structure is finished by taking the quantitative index as a design constraint condition. The method comprises the steps of firstly, reasonably representing an intrinsic law of static and dynamic hybrid uncertainty by utilizing an interval number and an interval process; secondly, constructing a dynamic function based on a response process of the ready-built structure in combination with an interval mathematic operation rule, and defining and analyzing a digital characteristic of the function by virtue of a discretization means; thirdly, defining and giving out an explicit expression of a hybrid reliability index of the structure by utilizing a first-passage theory; and finally, establishing a hybrid reliability-based non-probabilistic reliability optimization model of the ready-built structure, and performing quick iteration and robust solving of an optimization process in combination with an intelligent ant colony algorithm.

Description

technical field [0001] The invention relates to the technical field of comprehensive optimal design of proposed structures under multi-source uncertain conditions, in particular to the rational evaluation and optimal design of structural safety situations under the influence of static and dynamic mixed uncertainties. The design scheme of the proposed structure has theoretical and practical value for reference. Background technique [0002] The proposed structures (such as aerospace vehicles, bridges, buildings, etc.) play an extremely important role in the development of human life, production, national defense construction, and social progress, and are the material basis necessary for human survival. However, considering the long-term use of the structure (the service period of aircraft is 10-20 years, and the service period of bridges and buildings is 20-50 years), under the influence of internal and external, human and natural factors, irreversible changes will occur over...

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Problems solved by technology

However, due to the static and dynamic characteristics of load uncertainty and material dispersion in actual engineering structures, the calculation of reliability metrics based on mixed uncertainties and the optimization solution process based on reliability are relatively complicated; in addition, subject to small Due to the constraints of sample conditions, the existing reliability optimization methods based on probability and statistics theory cannot be applied to the formulation of real engineering structure design schemes

Therefore, there are relatively few non-probabilistic reliability optimization design methods for the proposed structure under static and dynamic multi-source uncertainties, and the theoretical foundation is weak

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