The joints of bridges are likely to be damaged by traffic, and are often deteriorated by drainage of rain and thawing agents. Hence non-jointification of floor slab is preferred. We here proposed a non-jointification of the extended floor slab, and examined size and shape of the slab and the support and their materials. Finite element analyses with thermal effect and contact phenomenon between the slab and the support as well as traffic loads could show feasibility of such joint mechanism.

Key Words : Non-Jointification， Extend Floor Slab， FEM analysis

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