铝合金管混凝土短柱长期性能试验与有限元分析

Concrete-filled aluminum alloy tubes (CFAT) offer high load-bearing capacity, excellent durability, and aesthetic appearance, which has broad application potential in exposed structures. Previous studies have confirmed the feasibility of CFAT as structural members, but research on their shrinkage and creep performance remains limited. Given that the stiffness of aluminum alloy tubes is lower than that of steel tubes, the shrinkage and creep effects would be more significant in these new composite members. To address this, this study designed and conducted sustained-load tests on CFAT short columns; a corresponding solid finite element model (FEM) was established and validated; the effects of shrinkage and creep on the deformation of CFAT were systematically investigated and compared with those of companion concrete-filled steel tubes (CFST). The results indicate that: Compared to CFST, the shrinkage and creep effects of core concrete are more significant on CFAT members, leading to up to 60% increase in the deformation；The solid FEM established in this study can effectively predict the shrinkage and creep effects of CFAT, with a maximum error of only 4. 8% against the test results.