Standard ASTM A 615 Reinforcing Bars #3 through #8 have diameters that correspond to their bar # divided by 8 to represent 8th of an inch, (i.e. a #5 bar is 5/8 = 0.625- inch in diameter). Please explain why this is not true for bar sizes #9 through #18 and instead explain what this sizing system is based off of. For example, explain why a #11 bar has a diameter of 1.410-inches as opposed to the expected 11/8 = 1.375-inches. Refer to either the textbooks or Appendix B of ACI 318 for the list of standard bar sizes

Structural Analysis
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Chapter2: Loads On Structures
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Standard ASTM A 615 Reinforcing Bars #3 through #8 have diameters that correspond to their bar # divided by 8 to represent 8th of an inch, (i.e. a #5 bar is 5/8 = 0.625- inch in diameter). Please explain why this is not true for bar sizes #9 through #18 and instead explain what this sizing system is based off of. For example, explain why a #11 bar has a diameter of 1.410-inches as opposed to the expected 11/8 = 1.375-inches. Refer to either the textbooks or Appendix B of ACI 318 for the list of standard bar sizes

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