Analysis of concrete-filled stainless steel tubular columns under combined fire and loading

Abstract

In fire scenarios, concrete-filled stainless steel tubular (CFSST) columns undergo initial loading at ambient temperature, loading during the heating phase as the fire develops, loading during the cooling phase as the fire dies out and continual loading after the fire. CFSST columns may fail some points during this process under combined fire and loading. In this paper, the failure modes and corresponding working mechanism of CFSST columns subjected to an entire loading and fire history are investigated. Sequentially coupled thermal-stress analyses in ABAQUS are employed to establish the temperature field and structural response of the CFSST column. To improve the precision of the finite element (FE) model, the influence of moisture on the thermal conductivity and specific heat of concrete during both the heating and cooling phases is considered using subroutines. Existing fire and post-fire test data of CFSST columns are used to validate the FE models. Comparisons between predicted and test results confirm that the accuracy of the FE models is acceptable; the FE models are then extended to simulate a typical CFSST column subjected to the entire loading and fire history. The behaviour of the CFSST column is explained by analysis of the temperature distribution, load versus axial deformation curves and failure response.

Concrete Encased with Engineering Plastics

“…Due to its desirable characteristics, PVC is the most widely used plastics in civil applications. An alternative to the technique of using steel tube with concrete in-fill [2,3] is the concretefilled plastic tube (CFPT) with potential field applications in marine piles and bridge piers [4]. Due to the limited test data, the mechanical performance of these structures continues to be pursued through experimental methods.…”