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Naval Air Station

Pearl Harbor

	Summery
	Objective
	Project Background
	Scope of Work
	Bravo 25 Description
	Overview
	Crane Rail Removal
	Loss of Transverse  Negative Moment  Capacity over the  Outboard Crane Rail
	Concrete Repair  Materials
	Top Deck  Repair Procedure
	Under Deck Repairs
	Cathodic Protection  System
	Cathodic Protection  System Installation
	Grout Resistivity  Measurements
	Reinforcing Steel  Lead Wire Installation
	Upgrade Reinforcement  Introduction
	Analysis of Bravo-25  Load Response
	Calculation of  Bravo 25 Resistence
	Modes of Failure
	Bravo 25  Upgrade Design
	Concrete Surface  Preparation
	Embedded  Reinforcement
	Wet Lay-up  Composite Laminate
	Proof Tests using  Impact Load Method
	Costs  Acknowledgements  References

Home > Featured Project > Pearl Harbor

Modes of Failure

The desired failure mode is CFRP rupture after the steel yields and before concrete strain reaches 0.003 in compression. If shear/flexure crack widths are excessive, differential displacement perpendicular to the CFRP at the crack will cause a shear failure of the laminate or the laminate will peel away from the concrete surface. This is another reason for restricting the stress/strain of the carbon laminate. At stresses less than 50 percent of ultimate strength, flexural cracks can be spanned and flexural performance is not restricted. The most undesirable failure is delamination or failure of the adhesive between concrete and laminate. The latter was avoided by ensuring the concrete surface was sound and that precautions were taken to remove loose material and laitance. Concrete tensile strength is less than the adhesive. Thus, failure can occur in the concrete as a secondary fracture with a thin layer of concrete adhered to the laminate or adhesive.

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