Answer Posted / ppl

Positive moment (with tension in the bottom) is created in
both simply supported and fixed beams which are loaded by
gravity. However, this moment is less in fixed beams, since
a fixed support is made to resist some of the moment in the
beam. As the other answers partially said, negative
moment(with tension in the top) is only created in fixed
beams because of the moment resistance in the connections.
True simply supported beams do not have negative moment
because by definition, their connections do not resist moment.

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