Experimental Study On Mechanical Behaviors Of Normal Cross-section Of Steel Recycled Concrete Composite Columns

Steel recycled concrete (SRRAC) composite structure is a new structure,which was recycled concrete (RC) in the configuration section, and also comes with a small amount of reinforcement and stirrup, it has advantages both of steel reinforced concrete (SRC) and recycled concrete structure.Studying on the steel recycled concrete was rarely found on the current domestic and international,based on static test of 6 axial specimens and 9 eccentric compression specimens to study the recycled aggregate replacement ratio, eccentricity of steel recycled concrete column capacity of eccentric compression and recycled aggregate replacement ratio, slenderness ratio of steel recycled concrete column axial compressive bearing capacity.Tests showed that the failure process and rupture forms of steel recycled concrete column is similar to ordinary steel reinforced concrete column. Solely from the characteristics of recycled concrete terms, without considering the influence of water absorption of recycled aggregate, that is to say, mix by ordinary concrete proportioning design, In this case ,the strength of recycled concrete is increasing with the recycled aggregate replacement rate. However, as the increase of recycled aggregate replacement rate , the bond force of the bonding surface become more and more weaker. After superposition of two functions, so that the bearing capacity of composite columns recycled aggregate will not substantially change .The changing law which the singly eccentric loads are changed with recycled aggregate and the relative eccentricity is shown as follows: with the increasing of eccentricity relative ,the flexural capacity of composite columns is also increasing, while the replacement rate of recycled aggregate changes to the bearing capacity is not obvious;The changing law which the axial load bearing force of SRRAC column is changed with recycled aggregate and the slenderness ratio is shown as follows: The flexural capacity of composite columns decreases wth the increase of slenderness ratio, the replacement rate of recycled aggregate changes to the bearing capacity is not obvious.Through theoretical analysis and experiment with the subject, the formulas of the axial compression column and eccentrically loaded column are proposed on the basis of the formula of ordinary steel reinforced concrete columns. To test data generation into the formula, the results show that there is little difference between the calculated values and test values.This research shows that, recycled aggregate replacement ratio had made a little impact on bearing capacity of composite columns .Therefore, steel reinforced concrete can meet project requirements on bearing capacity of composite columns at the same time solve the problem of how to deal with the building waste, integrated economic and environmental benefits of improved building, consistent with our strategic approach to sustainable development.