Ace Restoration and Waterproofing Incorporated ACE Restoration & Waterproofing Incorporated
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"The Concrete Restoration Experts" shim-white shim-white slogan
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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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shim_trans  Upgrade Reinforcement
 Introduction
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arrow_right  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

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Analysis of Bravo-25 Load Response

NFESC utilized detailed finite element analysis (FEA) modeling to characterize the structural behavior, determine reinforcement requirements, and verify proposed upgrade reinforcement designs. Finite element models were optimized and calibrated with the Impact Load Method (ILM) test results of 1996. They were further modified to reflect the additional CFRP reinforcement and were used to predict the load response of the as-built, upgraded structure.

 

The FEA program, STARDYNE, was used in the analysis. A detail of the FEA modeling is shown in Figures 41 through 45. The models are composed of three-dimensional elements representing portions of the deck and all girders, orthogonal shell elements for the remaining deck areas, beam elements for the piles and utility loops, and rods for the reinforcement bars. Two sets of models with the same overall geometry were developed. The first represented the pier in its original condition validated to match the ILM response and the second represented the pier in the upgrade configuration (e.g., Figure 45). Reinforced concrete properties were obtained from the ILM testing. The original FEA models provided flexure and shear response of the pier due to mobile crane operations. Using the FEA results, NFESC determined strength increases necessary to meet the additional demands of 70-ton (64 metric ton) crane operations over the existing capacity.

 

The upgrade FEA model set included the stiffness effects of the added carbon reinforcement. Carbon composite mechanical properties used in the FEA models were obtained from coupon tests using carbon fibers with a minimum ultimate strength of 500,000 psi (3,4500 mPa) and a minimum Young’s modulus of 30,000 ksi (207,000mPa). Additional stiffness restrictions were imposed to control deflections, mitigate crack growth, and minimize crack width. Table 1 contains the maximum flexural response to 130-kip (580 kN) outrigger loads in the upgraded slabs.

 

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Figure 41. Top view of Bravo 25 finite element model detail with access hole cut in curb deck and patch load applied near curb.

 

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Figure 42. Bottom view of Bravo 25 finite element model detail. Patch load applied to center slab.

 

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Figure 43. Cross section detail with load applied near curb.

 

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Figure 44. Model cross section detail with outrigger load on midspan of center slab.

 

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Figure 45. Finite element model detail of upgraded Bravo-25. Carbon rods installed on top surface.

 

Table 1. Outrigger Load Response of Bravo 25 Deck Elements
Member Location Direction Moment
Sign
Max Flexure
in-kips/ft
Shear
kips/ft
13-1/2” curb deck Edge of pile girder
Transverse
Negative 102 25.0

13-1/2” curb deck
Edge near curb Longitudinal Positive 52  
8.5” center deck Midspan Transverse Positive 130 19.5

8.5” center deck
Midspan
Longitudinal
Positive 95  
8.5” center deck Edge of transverse girder Transverse Positive 80  
Track slabs Edge of transverse girder Longitudinal Negative 200 26.0
Track slabs edge Midspan Longitudinal Positive 295  

 

 

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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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