Flexural Resistance of RC

8 important questions on Flexural Resistance of RC

What assumption of longitudinal normal strains is used to determine flexural response of RC?

Assume linear strain variation

Why are tension stresses ignored when calculating flexural resistance?

Because concrete is very weak in tension. Concrete tension stresses are zero at the crack where flexural resistance is critical.

CSA states that the maximum compression strain of a member in bending can be assumed to be 0.0035. Explain where this value comes from.

From empirical tests
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An equivalent rectangular stress distribution is used to calculate the bending resistance of RC. What 2 aspects of this distribution is "equivalent" to the non-linear distribution?

- Equivalent uniform stress distribution (multiplied by alpha)
- Distance c (multiplied by beta)

Why do the CSA equivalent rectangular concrete stress block factors vary with compression strength?

To ensure that the moment of the concrete compression around the axis of zero strain is accounted for/gives a better model for HSC.

For grade 400 reinforcement, what is the limit of compression strain depth c as a ratio of d if the reinforcement is assumed to yield?

0.64

What is the typical value of the internal flexural lever arm as a ratio of the effective depth?

0.85

Why can a lightly reinforced T-beam be treated as a rectangular beam with a width equal to flange width?

Because the neutral axis is in the flange and you ignore the effects of concrete in tension.

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