The technology of using a reinforced yoke to strengthen arch bridge is newly developed by the author of the present paper. Application of the technology to five bridges as well as a series of mode experiments have seen desired results. In light with the fracture mechanical theory, the paper discusses the role of the said technology in keeping the arch bridge cracks from further developing and in bettering the forcing property of bridge. The mechanical computation mode of the new technology is thereupon proposed. The views presented in the paper are expected to help improve the existing theory about bridge strengthening.
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