Civil engineering structure reliability evolution and residual life prediction method

Abstract

The invention relates to a civil engineering structure reliability evolution and residual life prediction method. The method comprises the following steps of: firstly, judging possible control sections of a structure according to numerical value analysis or mechanical knowledges; secondly, assuming distribution obeyed by each parameter through a statistical result of initial design information, and then calculating probability distribution obeyed by resistance and load of the structure; calculating a rigidity attenuation coefficient D (i) under the influences of the load, shrinkage and creep; furthermore, updating a resistance distribution function of the structure to obtain resistance probability distribution at the moment and obtain a reliability-load curvilinear relationship; establishing a reliability-time curve and predicting residual service life of the structure after undergoing load steps; and finally, combining actually measured information to continuously updating the residual life prediction result, and taking a shortest life value of each control section as the residual service life of the whole structure.

Description

technical field [0001] The invention relates to a reliability evolution and remaining life prediction method of a civil engineering structure. Background technique [0002] In order to evaluate the service performance of engineering structures in the whole life cycle (including design, construction, operation, etc.), a large number of researches have been carried out on the whole life analysis methods of structures at home and abroad. The service life of a structure is related to many factors such as material performance, detailed structure, exposure state, deterioration mechanism and their combined effects, so it is difficult to quantitatively analyze. At the same time, because the influence mechanism of the combined effect is quite complex, the current prediction of the service life of structures usually only considers a certain main factor, and the prediction methods used involve many disciplines. Existing structural life prediction methods are mainly based on experience...

AI Technical Summary

Problems solved by technology

[0010] 1) The influence of uncertainty is not considered in the structural life prediction

There are many factors affecting the safety performance of the structure, and the time span is long. During the period, it is affected by many uncertain factors, so that the evaluation of structural reliability will inevitably have deviations in the sense of probability, which will affect the accuracy of life prediction.

[0011] 2) The structural performance degradation is not considered comprehensively and the reliability of the structure is corrected and predicted based on the detection information of the structure

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