Study On Bond Behavior Of Frozen-thawed Concrete Under Cyclic Loading

China has a vast territory while many areas are in the cold zone. Frozen-thawedconcrete is one of the most prominent concrete structure durability damage in coldregion. Thus, studying bond behavior of frozen-thawed concrete under monotonic andcyclic loading can provide the basic data for nonlinear analysis research. It can improvethe seismic performance evaluation of existing reinforced concrete structure, also hasimportant theoretical meaning and engineering value to disaster prevention andreduction of concrete structure project.In this paper, firstly concrete specimens of three concrete strength C30、C40、C50were subjected to rapid freeze-thaw cycle test of0times,100times,200times and300times，establishing the relationship between the mass loss ratio and the freezing andthawing times. Then to load the specimen, obtained the bond-slip curve of differentconcrete strength and different freezing cycle times under monotonic and cyclic loading,analyzing the curve characteristics and relationship between peak bond stress andfreeze-thaw cycles.Based on test data, establishing the bond-slip constitutive relationship theorymodel of freeze-thaw damaged concrete under cyclic load. Put forward the six sectionsof constitutive relation expression, and further identified the key parameters as requiredby the theoretical model and related parameters are given. Establish the relationshipbetween related key parameters and freeze-thaw cycles...