Abstract
The performance of the steel–concrete interaction after fire exposure is essential for the post-fire evaluation of composite action in steel–concrete structures. Pushout tests for the bond–slip behaviour between steel tube and concrete are conducted for concrete-filled double skin steel tubular (CFDST) columns after exposure to fire. The main test parameters include the fire duration, the hollow ratio of the cross section, the diameter to thickness ratio of the steel tube, the surface roughness, and the effective length to diameter ratio. Measured temperature results are compared with the predicted ones from numerical analysis, and the load transfer mechanism before and after fire exposure is also discussed. It is found that the bond between the steel tube and concrete is still available after exposure to fire and, in general, the bond strength after fire exposure can meet the requirement of most current codes of practice.
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