Research on the Torsional Properties of Aluminum Foam-filled Steel Tube After Fire

Abstract

Torsion tests of hollow steel tubes and aluminum foam-filled steel tubes after fire have been carried out. The influencing factors, on the static torsional behavior of aluminum foam-filled steel tubes after fire were also investigated, including the porosity rate of aluminum foam and steel rate. The research results suggested that aluminum foam filled in tube had systolic collapse after high temperature. The oxide layer of the steel tubes had an exfoliation phenomenon. The uniaxial torsional curves of aluminum foam-filled steel tubes after fire have a longer plastic collapse region, and have no obvious hardening stage. The ultimate torsional bearing capacity of the steel tubes filled with foam aluminum after fire is half of that before fire. Compared with hollow steel tubes, the deformation and ultimate torsional strength of steel tubes filled with foam aluminum after fire is improved.