Simple Span of Joist With a Load (Tension and Compression)

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

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