Experiment Research On Bond Behavior Between Steel Bars And Concrete

The bond behavior between steel bars and concrete is a complex interaction between the two materials and the prerequisite for them to work together, meanwhile bond behavior is basis for analysis of end anchorage bond behavior of steel bars, different stress states between cracks and the different behavior of concrete members. So it has great significance for theory and practice. But because the influencing factors are numerous, the destruction types are complex, experimental methods have limitation and concrete in itself is misalignment, therefore the development of bond behavior research is slow and there has not a theory accepted widely been proposed now. In the past, the analysis of bond behavior mainly takes center pullout model experiment and axis-drawing model experiment, but these two methods have many disadvantages, such as over simplification of forced state, stress concentration and ignore the effect of stirrups and concrete cover thickness. These compromise the reality of the result.This dissertation studies on the bond behavior between steel bars and concrete through beam model experiment. By the experiment, the dissertation studies the failure modes of beam specimen, researches the generation, law of development and relationship with load of stress, analyzes the correlation between relative slip and load. Accord to stress of measuring points, the bond strain between steel bars and concrete is calculated by mathematical method, and action mechanism and distribution law of stress are analyzed subsequently. Meanwhile, the model of ultimate bond strength and constitutive model of bond-slip are determined through theory analysis, in order to offer the guidance for related problems, such as the determination of anchorage depth of steel bar in structure design, numerical simulation of bond behavior, and so on.