Experimental research on flexural mechanical properties of ultrahigh strength concrete filled steel tubes
Based on the project of Guansheng Qujiang Bridge,the flexural mechanical properties of ultrahigh strength concrete filled steel tube(UHSCFST)were discussed through the model test of three groups of six bending specimens,and the cube strength(fcu)of the core concrete reached 80.3～115.2MPa.The effects of concrete strength on flexural bearing capacity,deformation characteristics and failure modes of UHSCFST specimens were studied.Test results show that the bending failure modes of UHSCFST specimens are the same as that of ordinary ones,mainly manifested as overall bending failure due to excessive deflection,and local bulging in the compression zone.Furthermore,the bending capacity of the specimens do not decrease,even if they have yielded,and all specimens display outstanding bending ductility.The main function of core concrete is to provide radial restraint for steel tube to avoid premature buckling.When the steel content of the specimen section is constant,the strength increases of core concrete has slight impact on the bending failure mode,bearing capacity and ductility of UHSCFST bending specimen.
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