Durability Analysis Of Reinforced Concrete Bridge And Prediction Of The Remaining Life

Durability analysis of the reinforced concrete bridges and prediction of the remaining life are hot topics in domestic and abroad academe. The emphasis of this dissertation is carbonation, corrosion cracking, cracks and fatigue effects of durability damage on concrete structure in common atmosphere environment; applying dynamic reliability theory, it predicts the carbonation life, corrosion cracking life and load bearing capacity life through setting the reliability index of durability failure.Based on the previously study, this dissertation particularizes and analyzes the typical prediction model of carbonation and steel corrosion extent, according carbonation mechanism and steel corrosion mechanism; performance function of carbonation and corrosion cracking are established by using the representative forecasting model, statistic parameters are presented as well; carbonation life and corrosion cracking life are simply analyzed; considering the effects of carbonation, steel corrosion, cracks and fatigue effects synthetically, the declining moment resistance calculating formula of T-beam is deduced by nominal virtual height which quantifies the actual integration stiffness of component section; the max value of vehicle load distribution in service period is established on design period in order to reflect the accumulating effect; taking an existent bridge as an example, the established model is validated; the calculation method and procedure are discussed furthermore which is used in prediction of bending capacity remaining life on reinforced concrete bridges.Computer programs are written by C language in order to simplify the calculation. In declining curve of reliability index, the time which refers to limited state is achieved. And then, the life-span and remaining life of concrete structure are obtained.