Interfacial bond-slip properties of internally welded steel bar-steel pipe concrete
Aiming at the improvement of the interfacial bond strength between steel pipe and concrete of steel pipe-concrete compos-ite structure,and the investigation of the influence of different forms of internally welded reinforcement on the bond strength between the two interface,the steel pipe-concrete members with four different steel pipe-wall internally welded reinforcement structures were set up for the push-out test.The parameters were set on the test results to compare the influences of different forms of internally welded reinforcing bars on the bond performance between the two interface,and the combination of the curves and the test results described slipping process.ABAQUS software was used to perform finite element simulation to compare and analyse the effects of different structural measures on the bond-slip performance of welded reinforcement inside the steel pipe,and the calculation method of the shear capacity of steel pipe with built-in welded reinforcement was proposed.The results show that the structural measures of the internal welded reinforcement can greatly improve the bond strength of the steel pipe-concrete interface,and the interface bond strength gradually increases with the increase of the number of reinforcement rings.
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