Method of Predicting Reinforced Concrete Bridge Lifetime Under Seasonal Corrosion and Fatigue Bonding Actions

摘要

Reinforced concrete bridge life prediction method under seasonal corrosion and fatigue bonding action disclosed in the present invention, the life of the reinforced concrete bridge begins to corrode - three stages, including the net fatigue crack development stage, the corrosion hole and fatigue crack competition development stage, and the structural destruction stage divided into steps; Construct a rebar corrosion initiation and corrosion hole growth model, taking into account the effect of concrete corrosion expansion crack damage according to Fick's second diffusion law; Through the experiment, the fatigue crack growth characteristic parameters are determined by simulating the reinforcement crack expansion discipline under the influence of the four seasons environment; Build a stress intensity factor model considering the stress concentration effect and present a rebar corrosion fatigue crack growth analysis method corresponding to the four seasons environment; By clarifying the structural failure rules and combining vehicle load observation information to systematically consider the competitive coupling relationship between corrosion hole growth and fatigue crack growth, the failure mode can be determined in real time to realize bridge life prediction. This method is novel and reasonable, and can provide technical support for the safety assessment of concrete bridges currently in use.