Abstract
Six hybrid steel–polyvinyl alcohol (PVA) hybrid fiber–cement (HFC)-based composite encased concrete-filled steel tube (CFST) columns were tested for their seismic performance. The impacts of core concrete strength, steel tube thickness, and axial ratio on the seismic performance of the specimens were studied. According to the experimental findings, strengthening the core concrete can enhance the column's lateral bearing capacity and energy dissipation capabilities while also slowing the rate at which the steel tube's strain increases after yielding. Furthermore, HFC-encased CFST columns with a lower axial ratio and a thicker steel tube demonstrated superior seismic performance. An's equation of computation could better forecast the lateral bearing capacity of HFC-encased CFST columns when compared to other calculation methods. Finally, an experimentally validated finite element model of HFC-encased CFST columns was developed. Numerical studies showed that the seismic performance of composite columns can be significantly improved by increasing the strength of the HFC and the volume concentration of the steel fiber, and that PVA primarily acts in the plastic stage.
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