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By: Inter-tech Engineering  09-12-2011
Keywords: Seismic Retrofitting, Concrete Bridge Columns

New Seismic Retrofitting Technique

Experimental research was conducted to develop a rational and economical retrofit technique for concrete bridge columns. It involved testing seven full-scale reinforced concrete bridge columns under simulated seismic loading. The columns had either a circular or a square cross-section and represented pre-1970's design practice. The reinforcement arrangement consisted of 12 longitudinal bars with ties placed at 300 mm spacing.

The retrofitting scheme consists of transverse prestressing steel to externally reinforce columns for shear, while also improving concrete confinement. The effectiveness of these schemes were determined experimentally in the laboratory.

Prestressing wires were anchored using a newly developed twisted ring anchor.

In order to enhance the confinement of a rectilinear column, the externally applied pressure must have components perpendicular to the column face, and be as uniform as possible for increased effectiveness. Thus, a hollow structural section (HSS) was selected as external hoops to uniformly distribute forces exerted by the prestressing strands. The strand was placed directly on top of an HSS section and raised in 3 locations along each column side by means of half-disc shaped steel wire raisers to develop perpendicular force components.

Keywords: Concrete Bridge Columns, Seismic Retrofitting,

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We use multi-platform development tools such as XVT products and HOOPS3D graphics tools to further enhance our software. Software development includes multi-platform graphical user interface and internet applications. We specialize in, but are not restricted to, Civil Engineering software design and development. We have developed programs for various operating platforms such as Windows, LINUX, UNIX.