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# quiz%205%20w08%20solution - ENFD 375 BASIC STRENGTH OF...

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ENFD 375 – BASIC STRENGTH OF MATERIALS QUIZ 5 When checking a reinforced concrete beam for cracking, it is common to use the “gross section”; that is, the section ignoring the reinforcing bar. Shown is a “gross section” for a reinforced concrete beam. Assume that the concrete has a strength of 5000 psi in compression and 500 psi in tension (that is correct, concrete has a tensile strength which is 10% of the compressive strength). If the section is subjected to a NEGATIVE moment, what is the maximum it can take? The beam can fail in 2 possible modes: 1) Tension at the top 2) Compression at the bottom Once you hit the smallest of these 2, the beam fails and you’re done!

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quiz%205%20w08%20solution - ENFD 375 BASIC STRENGTH OF...

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