A Review of Bond, Beam-Column Joints, and Base Load Transfer in CE-CFST Columns
DOI:
https://doi.org/10.65204/djes.v3i3.846Keywords:
CE-CFST concrete-encased CFST bond-slip steel-concrete interface beam-column joint column base anchorage.Abstract
Columns that utilize a concrete-encased concrete-filled steel tube (CE-CFST) are composed of an inner concrete-filled steel tube and an outer reinforced concrete encasement around the inner tube. Although there have been numerous studies on the strength of CE-CFST columns, they are ultimately determined by the detailing at the following locations: (1) the steel tube-to-concrete interface and its bond and slip response; (2) the beam-to-column connections and their force transfer mechanisms; and (3) the column bases and load paths to the foundation. The review of the literature indicates that construction sequence and interface conditions can significantly impact the mobilization of the composite action and the stability of the cyclic response. Studies of beam-to-column connections found that connection configuration controls local deformation and stress concentrations around the steel tube, which ultimately governs energy dissipation, ductility and how much stiffness is retained over time. Furthermore, many researchers concluded that force transfer robustness is more important than peak strength. The available studies on column bases found that there are three different types of load paths and failure points for the following base concepts: (i) exposed; (ii) embedded; and (iii) concrete encased. In addition, there are anchorage and confinement details required for ductile behavior of CE-CFST columns and to avoid premature failure of the concrete encasing and localized distress to the steel tube due to unsupported loading conditions. There were several identified gaps in the research regarding how interface behavior and load conditions at connections and bases apply during repeated lateral loading; how test results can be used consistently in order to share knowledge gained from one study; and how to design according to constructible detailing solutions.
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