In-service structure optimal maintenance design method based on convex model time-variation reliability

Abstract

The invention discloses an in-service structure optimal maintenance design method based on convex model time-variation reliability. The method comprehensively considers the influence of uncertainty under the time effect to the in-service structural mechanic behavior. At first, time-variation uncertainty parameters are characterized by defining the convex model process, and the explicit expression of the limit state function characteristic quantities is deduced; based on the spanning theory of vibration mechanics and the structure non-probabilistic reliability model, the time-variation reliability index of the in-service structure based on the convex model is defined; furthermore, by taking the relationship between the maintenance cost and the service life of the structure into account, an in-service structure reliability design model is built based on the optimal maintenance decision; and by taking the reliability as the optimization target and maintenance time as the design variable, and repeating iterations through an intelligent optimization algorithm, the optimal maintenance and reinforcement design scheme for the drafted service period structure can be finally obtained.

Description

technical field [0001] The invention relates to the technical field of safety assessment and maintenance of in-service structures, in particular to structural reliability analysis and optimal design considering the time-varying uncertainty of a convex model, for further planning the engineering application of the concept of reliable control of large structures and for in-service It provides a reference theoretical basis for formulating the optimal maintenance plan for service structures. Background technique [0002] In-service structures, also known as service structures or existing structures, are inevitably accompanied by problems such as structural aging and performance degradation during their construction and use, and the decay of reliability over time is also irreversible. Reasonable maintenance methods can greatly improve the safety of the structure and extend the service period. However, the maintenance itself needs to pay a certain economic price. If the maintenan...

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Problems solved by technology

[0004] At present, the maintenance plan for in-service structures is usually formulated by comprehensively considering the coordination relationship between the expectation of structural performance improvement and maintenance costs at certain specific moments, and does not effectively account for the comprehensive impact of time-varying uncertainty effects on maintenance effects

Therefore, the current maintenance and reinforcement methods are usually over-redundant, at the cost of sacrificing economic benefits and time costs, in exchange for effective improvement of structural service performance, which to some extent restricts the original intention of refined maintenance design

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