Study On Damage And Bearing Capacity Degradation Of Reinforced Concrete Structure

Over time, RC bridges will deteriorate gradually because of the effect of climate and the durability problems will be found commonly. How to find a method to classify and analyze the decreases of durability and capacity is a very important project. Relying on the Application basic research project of Ministry of Communications "Study on damage and bearing capacity degradation of concrete bridge structure", this treatise analyze the reduce of rebar performance, strength degradation of concrete and degradation of bond slip. And time-varying Regularity of capacity of RC structure was analyzed considering three aspects comprehensively. Specific studies are as follows:The prediction model of steel corrosion rate is obtained by studying the time variation of steel corrosion rate; The degradation of the mechanical properties of steel bars is studied, and the degradation of the mechanical properties of the steel bar is connected with the time, and the constitutive model of corroded reinforcement is established; The finite element models of different corrosion rate and different corrosion morphology were established, and the main parameters affecting the performance of the steel bar were analyzed; The damage of concrete durability is studied, and the time is related with the time, and the damage constitutive model of concrete is established; The deterioration of bond slip between concrete and steel bar is studied, and the bond slip between corroded steel bars and concrete is established; By means of a finite element numerical model of corroded reinforced concrete beam is established, simulating its mechanical properties at different time points and the whole process of failure, of corroded reinforced concrete beam bearing capacity degradation was studied, and return to summarize the force bearing capacity of corroded reinforced concrete beam degradation curve.