Abstract
The bonding-slip behaviour of different materials of concrete-filled double skin steel tubular members under different interfacial connection structures, such as ribbed plates and ribbed plates with holes, are studied. The failure mode, the bonding force-slip curve and the strain distribution on the slip surface are obtained. The results show that the hollow ratio is inversely proportional to the bonding strength of the interface. The Perfobond leister (PBL) rib enhances bonding performance through increasing the diameter and holes, the effect of excessive hollow ratio on bonding stress is reduced. Different slip interfaces result in various bonding-slip mechanisms. Based on the typical failure modes and bonding-slip mechanism analysis, the bonding strength formulas and bonding stress-slip constitutive models suitable for CFDST members are proposed. A numerical model using a spring element is established by Abaqus for further mechanism analysis, the loading-slip curve and the stress state of the surface are consistent with measured results.
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