A Practical Treatise On Suspension Bridges Their Design Construction And Erect
A Practical Treatise On Suspension Bridges Their Design Construction And Erect
D B David Barnard Steinman
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The resultant of all the external forces, including the weight of the anchorage, must intersect the base within the limits necessary to prevent uplift at the heel (Fig. 44) ; and the inclination of the resultant from the normal must not exceed the angle of friction. If it proves impracticable to secure this stability against sliding with a hori- zontal foundation, the base may be sloped (Fig. 42) or stepped to increase the sliding resistance. Stepping the base is not effective save on hard foun...dations. In soft ground, requiring piles, the pile caps should be imbedded in masonry; and the piles should preferably be battered in the direction of the resultant pressure. Granite or other stone blocks should preferably be used to take the direct pressure of the anchor plate and knuckle cast- ings (Figs. 32, 33, 37, 42). Extending forward from the anchor plate, cut-stone blocks may be laid in arch formation, following the curving line of resultant pressure and with joints normal thereto. The rest of the anchorage, serving only to provide weight, may be built of rubble masonry or brickwork in hori- zontal courses; or of rubble concrete.
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