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Turbine Deck Load Capacity Restored

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Deck Restoration

Due to time constraints in the final design phase of the project, a design-build approach was chosen for the repair program. Because of the very difficult access to work areas, CFRP was the only reasonable choice for the strengthening needs of the project. The successful contractor for the repairs employed an engineer of record for the CFRP design. In general, the CFRP installation consisted of applying sheets 10" to 20" (250 mm to 500 mm) in width at lengths and spacings necessary to develop the full tensile strength of the material located at the positive and negative moment areas on the deck.




In order to access the performance of the installed strengthening system, a full-scale insitu load test was performed. The load test involved applying concentrated loads by positioning a forklift on top of the deck. The forklift was loaded with 3,600 lbs (1633 kg) in addition to its own weight for the final load cycle. This corresponded to a total load on the front axle of 16,600 lbs (7530kg). The forklift was originally positioned directly above one of the steel beams supporting the deck, then moved in increments closer to the mid-span of the slab. As it moved closer to the mid-span, the deflection of the deck under the wheel loads was monitored. Figure 1 shows the deflections measured as the forklift moved closer to mid-span.

These values were then used to compute the curvature of the slab at mid-span. The curvature of the deck is related to how much the slab bends under the applied load. Figure 2 shows the bending forces (moment) required to produce a certain curvature in the slab. By computing the amount of curvature induced in the slab, the induced curvature can be compared to the maximum curvature that the slab can withstand before failure. Figure 2 also shows that the levels of induced curvature in the slab are well below the failure point.


It  may be concluded that the strengthened slab has safety factor of approximately 6.5 against failure under the loads used during testing. This safety factor is sufficient to accommodate higher loads as well as to guard against a brittle, sudden failure of the slab. The latter is particularly important in this deck since the original post-tensioning is no longer considered effective.


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ACE Restoration & Waterproofing, Inc.
2940 E. Miraloma Ave.
Ste. B
Anaheim, CA 92806
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