Punching Shear Repaired with V-Wrap™ CFRP System Structural Technologies

During construction of a 23-story luxury condominium, an area of the slab became overloaded with materials causing punching shear in six columns.

The emergency repair required various strengthening techniques including the installation of 9” drop panels and near surface mount (NSM) rods on all six columns, full-depth demolition and new steel around two of the columns, and epoxy injection prior to the installation of STRUCTURAL TECHNOLOGIES’ V-Wrap™ C200H CFRP system.

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Bottom surface FRP sheet installation

Top surface installation of CFRP bars

testBottom surface FRP installation – top coattest

Form and pump of drop panels

Completed drop panels

Full/Partial Depth Repair

Concrete Pour

Concrete Pour

Formwork for drop panels

Formwork for drop panels

Slab demo

Shoring of slab

Significant punching shear failure

Bracing of columns

Top surface installation of CFRP bars

No visible distress, but this column is deficient in negative moment and shear

Project Overview

Investigate Design Build project to address punching shear caused by overloading the area with material.
V-Wrap™ C200H CFRP system installed to strengthen the six columns effected by the punching shear.
Completed project ahead of schedule and under budget.

During construction of a 23-story luxury condominium, an area of the slab became overloaded with materials causing punching shear in six columns. The emergency repair required various strengthening techniques including the installation of 9” drop panels and near surface mount (NSM) rods on all six columns, full-depth demolition and new steel around two of the columns, and epoxy injection prior to the installation of STRUCTURAL TECHNOLOGIES’ V-Wrap™ C200H CFRP system.

STRUCTURAL TECHNOLOGIES worked closely with the general contractor and engineer of record to provide design assistance and to install our strengthening solutions. This collaboration kept the project under budget and allowed for it to be completed ahead of schedule.