Question

In: Civil Engineering

What are some clues in design nomenclature that refers to design strength ? I am having...

What are some clues in design nomenclature that refers to design strength ? I am having trouble wrapping my head around when to introduce the resistance factor to the nominal strength of a member. From what I understand the "available strength" = "design strength" = Nominal Strength x Resistance Factor.

Is it safe to assume that if a problem statement refers design strength the value must include the resistance factor ?

Solutions

Expert Solution

.Yes, the understanding is correct.The nominal strength reduced by the 'resistance factor' is termed as the design strength φ Rn.

Following are the reasons to use Φ (phi) factor:

  1. Possible variations in dimensions.
  2. Possible variations in material strength.
  3. Possible inaccuracies in the strength equations.
  4. To ensure a good level of safety of reinforced concrete structures.

If a problem says design strength, then it is already reduced by the resistance factor.

Refer Section 9.3 of ACI 318-14. below is the reference image for the same.


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