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Recent Projects

Featured Projects

Naval Air Station

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


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Home > Featured Project > Pearl Harbor

Featured Project

 

Upgrade Reinforcement

Introduction

Important parameters for external reinforcing are stiffness, strength, flexibility, durability, and reliability. Carbon fiber reinforced plastic (CFRP) was chosen to externally reinforce the Bravo 25 deck because of its high strength-to-weight ratio and other beneficial characteristics. Due to its high strength and low weight, additional reinforcing could be added to the existing steel reinforced concrete without adding excessive mass. CFRP high strength and stiffness translated to smaller amounts of reinforcing which yielded an easier installation that is more efficient. CFRP is corrosion resistant and possesses outstanding fatigue properties. It strengthens and stiffens existing reinforced concrete sections while it mitigates crack width and growth. CFRP also restricts crack growth into the compression zone of the section, thereby increasing the punching shear strength of the concrete deck slab.

 

Of all fibers, NFESC has determined high strength carbon possessed the best resistance to the extremes of the maritime industrial environment. It required the least amount of intrusion into the top of the deck for embedded reinforcement and the least quantity and effort to add to the bottom surface to achieve required strength and stiffness.

 

The upgrade design process necessitated an analysis to determine the structural response to required loading and calculation of the existing structural resistance. External CFRP reinforcing was then added to those elements where the required response exceeded the structural resistance. The resistance of the upgraded elements is greater than the required load response plus a factor of safety greater than 2.

 

Problematic Traits. CFRP has no plastic deformation prior to rupture, so plastic hinges for load redistribution do not form in the traditional sense of steel reinforcing. Epoxy thermal expansion coefficients are 7 times larger than concrete. Different thermal properties will increase stress between the concrete and adhesive interface. Cutting slots to embed CFRP rods on the top side will increase chances of initiating concrete cracks at the slot root that runs parallel to the reinforcement.

 

Risks Affecting Safety. CFRP lacks a lengthy track record in civil structures, which presents several risks. CFRP lacks reliable quality control for strength and geometric properties. It is subject to impact damage and precautions must be taken to protect it from exposure in industrial areas. The long-term effects of the waterfront environment such as saltwater, high humidity, etc., on the concrete CFRP bond line are not well established. The fatigue strength and creep rates of the CFRP-concrete interface are not known. Most cold setting epoxies experience a decline in shear modulus and a reduction in shear strength at high temperatures from solar radiation.

 

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ACE Restoration & Waterproofing, Inc.
620 E. Walnut Ave.
Fullerton, CA 92831
714.526.7366
Fax: 714.526.7965

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  ACE Restoration and Waterproofing Quick Service Overview:
  Concrete repair; concrete restoration, structural upgrade, epoxy injection,
  waterproofing, and more concrete technologies in Fullerton California (CA)
  by ACE Restoration and Waterproofing.

  Concrete Repair, Concrete Restoration, Epoxy Injection, Waterproofing

http://www.acerestoration.net/

 

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