Skip to main content
placeholder image

Spline-shape modification for FRP-confined concrete columns: theory and evaluation

Conference Paper


Download full-text (Open Access)

Abstract


  • The confinement efficiency for FRP-confined square concrete columns is relatively low

    compared to circular columns due to a large area of ineffectively-confined concrete and stress

    concentration at sharp corners. Shape modification of square concrete columns has been proposed but

    modifying the shape of cross-section from a square to a circle results in a significant increase in crosssectional

    area and self-weight of the columns, which raises new issues and is not practical when the

    space in the structure is limited. To address the abovementioned issues, a spline-shaped cross-section is

    proposed in this study as a target shape for shape modification. A finite element model was first built and

    validated with results from a previous experimental program. Specimens with square, circular shapemodified

    and spline-shaped modified cross-section and confined with FRP were modelled and compared.

    A number of spline-shaped cross-sections with different aspect ratios (defined as the ratio of minor axis to

    the major axis) were incorporated in this study. Results from the analysis showed that the confinement

    efficiency of FRP-confined spline-shaped concrete columns was higher than square or circular columns.

    Among the spline-shaped columns, those with a small aspect ratio achieved higher confinement

    efficiency than those with a large aspect ratio.

Publication Date


  • 2014

Citation


  • Hadi, M. N. S. & Lei, X. (2014). Spline-shape modification for FRP-confined concrete columns: theory and evaluation. In R. El-Hacha (Eds.), 7th International Conference on FRP Composites in Civil Engineering (CICE 2014) (pp. 1-6). United States: International Institute for FRP in Construction.

Scopus Eid


  • 2-s2.0-84924891405

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3867&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2858

Start Page


  • 1

End Page


  • 6

Abstract


  • The confinement efficiency for FRP-confined square concrete columns is relatively low

    compared to circular columns due to a large area of ineffectively-confined concrete and stress

    concentration at sharp corners. Shape modification of square concrete columns has been proposed but

    modifying the shape of cross-section from a square to a circle results in a significant increase in crosssectional

    area and self-weight of the columns, which raises new issues and is not practical when the

    space in the structure is limited. To address the abovementioned issues, a spline-shaped cross-section is

    proposed in this study as a target shape for shape modification. A finite element model was first built and

    validated with results from a previous experimental program. Specimens with square, circular shapemodified

    and spline-shaped modified cross-section and confined with FRP were modelled and compared.

    A number of spline-shaped cross-sections with different aspect ratios (defined as the ratio of minor axis to

    the major axis) were incorporated in this study. Results from the analysis showed that the confinement

    efficiency of FRP-confined spline-shaped concrete columns was higher than square or circular columns.

    Among the spline-shaped columns, those with a small aspect ratio achieved higher confinement

    efficiency than those with a large aspect ratio.

Publication Date


  • 2014

Citation


  • Hadi, M. N. S. & Lei, X. (2014). Spline-shape modification for FRP-confined concrete columns: theory and evaluation. In R. El-Hacha (Eds.), 7th International Conference on FRP Composites in Civil Engineering (CICE 2014) (pp. 1-6). United States: International Institute for FRP in Construction.

Scopus Eid


  • 2-s2.0-84924891405

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3867&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2858

Start Page


  • 1

End Page


  • 6