Question

Building codes usually specify that deflections (Bending downward at the center) in a floor joist for residential buildings should not exceed 1/360 of the span under normal loads. What fraction of an inch would this equal for a span of 10'-0"? Show your calculations below.

Answer 1

The maximum allowable deflection of a floor joist under normal loads for a span of 10 feet as per building codes is 1/3 of an inch (1/360 of the span).

Step-by-step explanation:

Building codes often dictate that the deflection of a floor joist in residential buildings must not exceed 1/360 of the span under normal loads. To convert this deflection ratio into a fraction of an inch for a span of 10'-0" (120 inches), you would perform the following calculation:

• Multiply the span length in inches by the deflection ratio: 120 inches x (1/360) = 1/3 inch.

Therefore, for a 10-foot span (120 inches), the maximum allowable deflection would be 1/3 of an inch.