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Why does the diagram for the joist substitutes with a cantilevered end show the cantilever and the main-span being the same length?

April 26, 2017cantilever cantilevered diagram joist LENGTH substitutes

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Why does the diagram for the joist substitutes with a cantilevered end show the cantilever and the main-span being the same length?

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By balancing the lengths, the force is applied to the supporting joist would be balanced by the applied load to the joist for the same loading condition. It is possible to have different lengths of the cantilever and the main-span; however, the supporting joist design must be reviewed.