Bridge reliability predicting method and maintenance method of bridge

Abstract

The invention relates to a bridge reliability predicting method and a maintenance method of a bridge. The bridge reliability predicting method comprises the following steps: (1) monitoring the limit state of bearing capacity: (1-1) monitoring the limit state of bending bearing capacity of a mid-span front section; (1-2) monitoring the limit state of the shearing bearing capacity of a fulcrum oblique section; (2) monitoring a normal use limit state: (2-1) measuring bridge crack width; (2-2) monitoring a deflection limit state; (3) monitoring a limit state of reinforcement stress; (4) monitoring a limit state of concrete stress; (5) comparing monitoring data with preset data according to the monitoring data obtained in step (1) to step (4), thus obtaining bridge reliability. Through carrying out research on a bridge preventive maintenance model based on bridge material fatigue degradation and structure reliability decay prediction, a bridge material fatigue degradation rule and influence factors and an influence rule of the bridge structure reliability decay are explored, and a decay rule of the bridge material fatigue degradation along with time and a prediction method of the residual life of the bridge are summarized.

Description

technical field [0001] The invention relates to bridge maintenance, in particular to a bridge reliability prediction method and a maintenance method thereof. Background technique [0002] As we all know, after a bridge structure is built and put into use for a period of time, its exposure to the atmospheric environment makes the structural performance degradation an inevitable result. The design resistance decays with time, and the reliability index decreases. Normal use The function is threatened. When the structure cannot be properly maintained and repaired, the further deterioration of the resistance will lead to extreme damage to the bridge structure, that is, the structure cannot guarantee safe operation or directly collapses. In our country, a large number of bridges are facing problems such as aging, damage and performance attenuation, and the evaluation and prediction of the state of degraded bridge structures, as well as the selection of various maintenance measures...

AI Technical Summary

Problems solved by technology

[0004] In summary, although the concept of reliability-based degradation and maintenance models has been proposed, due to the lack of systematic understanding of the fatigue degradation of bridge structural materials, the research on the time-varying reliability of bridge structures is not in-depth. Therefore, the current bridge structure maintenance scheme Still relying on deterministic analysis of bridge performance, bridge maintenance management lacks initiative and preventiveness