Experimental Studies On The Bond-anchoring Performance Between Reinforcing Bars And Concrete After High-temperature Processing

With the development of modern architecture and the utilization of all kinds of newbuilding materials, building fire has been high. Modern concrete is a kind of artificial stonethat is exploited in modern times. The combination of reinforcement and concrete has beenused in all kinds of structure forms, but the reinforced concrete structure will be damagedunder the condition of high temperature and the reinforcement and concrete bonding willpresent significant degradation, which will directly affect the safety and operationalperformance of the concrete structure. So the study on the bond-anchoring performancebetween reinforcing bars and concrete after high-temperature processing is very meaningfulfor the detection, evaluation and reinforcement of the structure.Based on the experimental study and finite element simulation analysis, we research thechange rules of reinforced concrete bonding anchorage performance after high temperature,and launch the research from the following several aspects:1. We make concrete of different strength grades and steel and concrete bondingspecimens of different diameter, then we make researches on them under different hightemperature.2. We make center pull-out test on the bond-anchoring performance between reinforcingbars and concrete after high-temperature processing. Besides, we analyze the relationshipbetween the bond strength of the reinforcement and concrete specimen and the strength gradesof concrete, steel bar diameter and the factors of heating temperature etc. The varyingpatterns of bond-anchoring performance between reinforcing bars and concrete are analyzed.3. The bond anchorage reinforcement and concrete test are simulated, then we can getthe relationship between the steel drawing force after high-temperature processing and thebonding surface sliding. We make comparative analysis of the simulating results and testingresults.