principal beam

principal beam

The largest or main beam in a framework.
References in periodicals archive ?
(2) reinforcement of principal beams with FRP plates on the bottom face of the beams [20];
(3) reinforcement of principal beams with a system of unbonded prestressing, external to cross-section of beams.
Many of the state's oldest bridges were built without extra support to catch the structure if one of the principal beams fails, a concept known as redundancy.

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