Tension and Compression at Floor Joist Under Load

Compression occurs on the top edge of a rafter, floor joist, or beam when a load is applied. This is due to the force pushing down, causing the top fibers of the member to shorten. Tension occurs on the bottom edge of the rafter, joist, or beam when the same load causes the bottom fibers to stretch and elongate.
Compression occurs on the top edge of a rafter, floor joist, or beam when a load is applied. This is due to the force pushing down, causing the top fibers of the member to shorten. Tension occurs on the bottom edge of the rafter, joist, or beam when the same load causes the bottom fibers to stretch and elongate.

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