Question

Q. Determine the design moment strength of the section shown? Check section to see if it is ductile. Steel yielding strength fy = 60,000 psi and Concrete Compressive strength fc' = 4000 psi, effective width =40 in.​

Answer 1

Answer:

the word which collicatests with flowing is

Answer 2

Answer:

Explanation:

FORCES

From equilibrium we have Cc = T or

αfc′bc = Asfs (5.9)

M = TZ = As fs (d − βc) (5.10)

or

M = CcZ = αfc′bc (d − βc) (5.11)

CIVL 4135 90 Flexure

5.5. Tension Failure

fs = fy steel yielding (5.12)

From Eq. (5.9) we have

c = As fy

αbfc′

× d

d = As

bd

fyd

αfc′ = Ã

fy

fc′

d

α

(5.13)

Substitute c from Eq. (5.13) in Eq. (5.10)

Mn = As fy d − Ã β

α

fy

fc′

d (5.14)

with the specific, experimentally obtained values for α and β we always have

β

α = 0.59 for fc′ = 4, 000 psi or any other strength (5.15)

Therefore, Eq. (5.14) simplifies as

Mn = As fy d − 0.59Ã

fy

fc′

d (5.16)

or

Mn = Ãbd2 fy 1 − 0.59Ã

fy

fc′

 (5.17)

where Mn = nominal moment capacity.

5.6. Compression Failure

In this case, the criterion is that the compression strain in the concrete becomes