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Cooper River Bridge Figures 5.1 - 5.4
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Figure
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Description
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Thumbnail
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5.1
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Different grades of steel were used in the truss members based on the applied load. The basic concept was to maintain the same member size and shape and vary the member strengths by varying the material yield strength and plate thickness (A36 = Fy 36 ksi, A572 = Fy 50, A514 = Fy 100.)
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5.2
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View of connection of floor beam to truss.
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5.3
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View of connection of upper cross bracing member to truss.
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5.4
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In order to accommodate the secondary horizontal bending stresses in the floorbeams, a unique design had to be used. Assume the floorbeam spacing and panel point length along the bottom chord is L. As the truss deforms under load, the panel point length changes to L'. Measured at the floorbeam ends, the floorbeam spacing is now L', but measured at the floorbeam centerline, where the stringers are fixed, the spacing is still L. This deformation is accompanied by bending about a vertical axis, and it is these horizontal bending stresses that need to be accommodated.
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Map 1
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A simplified map of South Carolina showing the location of Charelston.
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Map 2
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A simplified map of Charelston showing the locations of the Cooper River, Clouter Creek, and the Wando River.
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