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Experimental study on reinforced concrete columns in precast permanent thin-walled steel formwork

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Document pages: 11 pages

Abstract: Due to the large number of temporary formwork works on site, the traditional construction method of reinforced concrete (RC) structure usually requires a long construction period and high cost. In this study, a prefabricated permanent thin-walled steel formwork (ppsfrc) with integrated reinforcement cage is developed, which is conducive to rapid construction by reducing temporary formwork works. Axial compression tests were carried out on 9 specimens to study the structural properties of the newly developed column. Compared with traditional concrete filled steel tubular (CFT) columns, the proposed column construction method uses relatively thin steel plates, but its design has sufficient performance to resist the lateral pressure of fresh concrete and prevent bucklingng of the thin plates by utilizing the steel angles and channel stiffeners prefabricated in the permanent thin-walled steel form. The experimental results showed that the column specimens fabricated by the PPSFRC method had better local buckling resistance and behaved in a more ductile manner compared to the conventional CFT columns. In addition, the axial strengths of the test specimens were compared with those estimated by design provisions, and the flexural moments induced by initial imperfection or accidental eccentricity of axial loads were also discussed in detail.

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