Paper number 549

DEVELOPMENT OF COMPOSITE GRID TUBES FOR THE REINFORCEMENT OF CONCRETE COLUMNS

S-W.R. Lee1, Z. Li2, J.M. Tang1, S. Lee3, and P. Tong1

1Department of Mechanical Engineering, Hong Kong University of Science & Technology
Clear Water Bay, Kowloon, Hong Kong
2Department of Civil Engineering, Hong Kong University of Science & Technology
Clear Water Bay, Kowloon, Hong Kong
3Advanced Engineering Materials Facility, Hong Kong University of Science & Technology
Clear Water Bay, Kowloon, Hong Kong

Summary This paper introduces a new type of composite grid tubes for the reinforcement of concrete columns. The fibers were wound in the pre-cut grooves on the surface of a PVC tube to form a grid structure. The pattern could be either orthogonal or helical. Once the composite grid tube was fabricated, cement concrete was poured into the tube to form a hybrid column structure. Within the scope of the present study, the focus was placed on investigating the effect of confinement provided by the reinforcing composite grid tube on the compressive strength of concrete columns. The hybrid columns were subjected to uni-axial compression. The same test was performed on a pure concrete column as well for benchmarking. It was identified that the composite grid tube could substantially increase the compressive strength and toughness of concrete columns. With further investigation on durability, the present hybrid structure may have good potential to compete with the conventional steel rebar reinforced concrete columns.
Keywords composite grids, filament winding, concrete, hybrid system, infrastructure.

Theme : Reinforcement and repair in Civil Engineering and Building Construction

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