Simple Span of Joist With a Load

Here's a floor joist span with a load on the joist, which is in compression and tension. Fibers at the top of the joist are in compression, and the fibers in the bottom are in tension.
Here's a floor joist span with a load on the joist, which is in compression and tension. Fibers at the top of the joist are in compression, and the fibers in the bottom are in tension.

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