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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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shim_trans  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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arrow_right  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

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Bravo 25 Upgrade Design

The NFESC upgrade design determined a required upgrade reinforcing areas that was based on an equivalent maximum carbon fiber working stress of 200 ksi (1,400 mPa) at a strain less than 0.7 percent. This recognizes strength losses with time and repeated load application. The NFESC design detailed a high strength carbon fiber area of 0.033 in.2/in.-width (0.083 cm2/cm) for the bottom surfaces and 0.018 in.2/in.-width (0.012 cm2/cm) for the areas on the top surface of the deck. For a composite laminate with 65 percent carbon fiber, this translates to a laminate area of 0.051 (0.125 cm2/cm) and 0.028 in.2/in.-width (0.071 cm2/cm) respectively. Table 2 lists the current flexural capacities of the subject members as well as the target upgrade capacities. All upgrade reinforcement materials were required to be compatible with ordinary concrete as well as polymer concrete with 12.5 pH and to not adversely effect the titanium-based cathodic protection system. The design life of the upgrade was 20 years without significant degradation. The contractor installed the following reinforcement selections:

· Top Reinforcement: pultruded, 3/8-inch diameter (9.6 cm), high-strength carbon composite bars encapsulated by epoxy in slots cut into the concrete surface.
· Bottom Reinforcement: Hand lay-up, prepregged, uniaxial, carbon fiber tow sheets with epoxy matrix.

 

Table 2. Flexural Capacities of Bravo 25 Deck Elements

Members Direction Moment
Sign
Current
in-kips/ft
Upgrade
in-kip/ft
%
increase
13-1/2" deck (top)
Transverse

Negative

Corroded
600 --
13-1/2” deck (bottom) Longitudinal Positive
Unreinforced
549 --
8-1/2” deck (bottom)
Transverse
Positive 222 312 41

8-1/2” deck (bottom)
Longitudinal Positive 110 216 96
Track slabs (bottom) Longitudinal Positive 1,480 1,735 17

Track slabs (top)
Longitudinal Negative 846 990 17

 

In accordance with NFESC drawings and specifications, the contractor bonded tow sheets in the longitudinal direction of the bottom of the deck between the continuous outboard girder and the curb and the bottom of the track slabs (Figures 47 and 48). Transverse, carbon laminate reinforcement was bonded to the bottom of the deck between the track slabs (Figures 47 and 49). Carbon/epoxy rods were embedded in the transverse direction to reinforce the top of the 13-1/2-inch (34 cm) deck over of the outboard girders to the curb and in the longitudinal direction to reinforce the top of the track slabs over the transverse girders (Figures 47 and 50). The deck areas with large utility openings near the curb were not reinforced since outriggers cannot be placed on these locations.

 

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Figure 47. Section view of basic locations of upgrade reinforcement.

 

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Figure 48. Plan view of basic locations of longitudinal upgrade reinforcement on bottom deck and rail stringers.

 

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Figure 49. Plan view of transverse upgrade reinforcement on bottom deck between rail stringers.

 

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Figure 50. Plan view of basic locations of longitudinal upgrade reinforcement on top deck.

 

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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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