I need to increase the moment capacity of a few reinforced concrete joists by adding carbon fiber reinforcement to the bottom side only. The joists, originally built in 1958 appear to be designed with fixed ends. When I analyze them with the new loads and fixed ends, the moment is too high in the top. If I analyze them with pinned ends I can install enough reinforcement in the bottom to get them to work. If I do this, will a crack form perpendicular to the joist over the girder and then become a pinned connection? The joists were poured monolithically with the girders.
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