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arch bridges, a keystone in the middle of the bridge bore the weight of the rest of the bridge. the more weight that was put onto the bridge, the stronger its structure became. masonry arch bridges use a quantity of fill material (typically compacted rubble) above the arch in order to increase this dead-weight
"designing the segmental arch" (pdf). ebuild.com. retrieved may .[ permanent dead link ] ^ temple, robert. the genius of china: years of science, discovery, and invention. new york: touchstone, . ^ colin o'connor: "roman bridges", cambridge university press , p. isbn - - - ^ galliazzo , pp. , (fig. )...
https://en.wikipedia.org/wiki/Arch_bridge