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Excerpt from Design of 2-Hinged Spandrel Braced Steel Arch Double Track Railway Bridge, 400 Ft. Span
It impracticable to apply this formula to the braced arch. The omissioniof a center hinge renders the horizontal thrust at the abutments a statically indeterminate quantity. However, there are two practical methods of determining this thrust; lst, by the application of the theorem'of.
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