Composite girder partially reinforced with carbon fiber reinforced polymer

Inactive Publication Date: 2015-01-15
KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

This patent describes a method of strengthening a composite concrete-steel girder by adding a layer of carbon fiber reinforced polymer to the upper surface of a concrete slab. This strengthening is done to reinforce the negative moment region of the files, which is the region where the composite girder is most prone to reinforcement failure. The carbon fiber reinforced polymer layer is about 0.25 mm thick. This invention makes it easier to strengthen the composite girder and improve its overall performance.

Problems solved by technology

Failure in bending will occur when the bending moment is sufficient to induce tensile stresses greater than the yield stress of the material throughout the entire cross-section.

Method used

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  • Composite girder partially reinforced with carbon fiber reinforced polymer
  • Composite girder partially reinforced with carbon fiber reinforced polymer
  • Composite girder partially reinforced with carbon fiber reinforced polymer

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Embodiment Construction

[0022]The composite girder partially reinforced with carbon fiber reinforced polymer (CFRP) 10, as shown in FIG. 1, is similar to the prior art steel-concrete composite beam shown in FIG. 3, but with a layer 12 of carbon fiber reinforced polymer mounted on the upper surface of concrete slab CS and extending across the negative moment region NMR. For a conventional composite construction girder having a length of 9.6 m, the NMR has a length of about 2.36 m; i.e., extending 1.18 m along either side of the fulcrum point of cross beam CB. The polymer is preferably epoxy, although polyester, vinyl ester, or nylon may be used. The sheet of CFRP is bonded to the concrete slab by an adhesive, which is preferably a 2-part epoxy impregnation resin, although any suitable concrete adhesive may be used.

[0023]In order to examine the effectiveness of the carbon fiber reinforced polymer layer 12 a finite element analysis was performed, comparing a conventional continuous composite steel-concrete (C...

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Abstract

The composite girder partially reinforced with carbon fiber reinforced polymer is a composite steel-concrete beam partially reinforced with a sheet of carbon fiber reinforced polymer bonded to a concrete slab secured to a flange of the steel beam by shear studs, the sheet of CFRP extending across the length and width of the negative moment region of the beam. The negative moment region may be centered about a point of interior support of the composite steel-concrete beam. The carbon fiber reinforced polymer may have a thickness of about 0.25 mm.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to construction elements and supports, and particularly to a composite girder partially reinforced with carbon fiber reinforced polymer that provides a composite steel-concrete beam or girder that is reinforced with a layer of carbon fiber reinforced polymer over a negative moment region of the composite steel-concrete girder.[0003]2. Description of the Related Art[0004]As shown in FIG. 2A, conventional steel beams B are typically used to carry a concrete slab CS supported by a metal deck D. FIG. 2A illustrates typical non-composite construction, in which the beam B does not interact structurally with the concrete slab CS; i.e., the concrete slab is essentially dead weight on the metal deck D disposed between the slab CS and the steel beam B. This is because the slab CS is not adequately bonded to the beam B. In contrast, as shown in FIG. 2B, in composite construction, the concrete slab CS ...

Claims

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Application Information

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IPC IPC(8): E04C3/10
CPCE04C3/10E04B5/40E04C3/29
InventorSHARIF, ALFARABISAMAANEH, MOHAMMAD ABDULRAHMAN
OwnerKING FAHD UNIVERSITY OF PETROLEUM AND MINERALS