CEPRCD30 SRB Concepts, Formulas, and Variables

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Due to lack of mathematical symbols: Italic “E” will serve as epsilon/strain symbol, Italic “p” for raw, “B” for beta, etc.

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61 Terms

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Mu

Design Moment Capacity / Ultimate Moment Capacity

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Mn

Nominal Moment Capacity

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C

compressive force (Concrete)

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T

Tensile force (Steel)

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C [d-a/2] or T [d-a/2]

Mn = _____

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ø

Reduction factor

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øs

diameter of stirrups

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Recommended reduction factor according to Table 421.2.1 Strength Reduction Factors, ø

ø → 0.65-.090

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a

  • distance from the fiber of maximum compressive strain

  • depth of compression block

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B1c

a = _____

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b

beam width

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c

  • Distance from the fiber of maximum compressive strain to the neutral axis. Measured perpendicular to the neutral axis.

  • depth of neutral axis

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d

effective depth

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dt

distance of the centroid of the extreme tension bars to the extreme compression fiber

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cc

concrete cover

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0.85fc’ab

C’ = _____

Formula for the resultant force of the rectangular stress at the compressive block.

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Whitney’s Rectangular Stress Distribution

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fsAs

T = ____

Formula for the resultant force located at the centroid of the tensile block.

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Table 422.2.2.4.3

Values of B1 for Equivalent Rectangular Concrete Stress Distribution

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0.85 ←→ 0.65

Limits of B1

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B1 = 0.85

fc’ = 17 → 28 MPa

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B1 = 0.85 - 0.05/7 (fc’-28)

fc’ > 28 MPa

fc’ < 55 MPa

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B1 = 0.65

fc’ > 55 MPa

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fy

  • yield strength/stress of the Steel Reinforcement

  • grade ng bakal

  • usually in ksi

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English

System of unit used when the Grade is less than 100 ksi.

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Metric

System of unit used when the Grade is greater than 100 ksi.

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0.002

421.2.2.1

For Grade 415/420 deformed reinforcement, it shall be permitted to take Ety equal to ____.

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200 000 MPa

Es (Modulus of elasticity of steel)

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0.003 [(d-c)/c]

Es (Tensile strain in steel)

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εt

Net tensile strain

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εc

compressive strain of the concrete = 0.003

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εty

fy/Es = yield strain

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0.003 [(dt-c)/c]

Et = _____

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Neutral Axis

Where strain is equal to zero (0).

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Compression controlled

(Spiral=0.75, Other=0.65)

Classification for when the hoops/anilyo on the tensile block is not yielding.

Et < Ety

fs < fy

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Transition

(Spiral= 0.75 + 0.15 [(fs-fy)/(1000-fy)], Other= 0.65 + 0.25 [(fs-fy)/(1000-fy)])

Ety < Et < 0.005

fy < fs < 1000

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Tension controlled

(Spiral=0.90, Other=0.90)

Classification for when the hoops/anilyo on the tensile block is yielding.

Et > 0.005

1000 < fs

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Transition

Et > Ety

Et < 0.005

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ρ

steel reinforcement ratio

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ρact

As/bd

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ρmin

1.4/fy ; fc’/4fy or (0.25fc’)/fy

*whichever is higher

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ρmax

[by the code]

(0.85fc’/fy) (3/7) B1 (dt/d)

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pmax

[tension controlled]

(0.85fc’/fy) (3/8) B1 (dt/d)

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3/7 dt

c if Et = 0.004

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3/8 dt

c if Et = 0.005 (T.C.)

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m

fy/0.85fc’

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As/bd

p = ___

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εt = 0.004

Maximum reinforcement (by the code)

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εt = 0.005

Maximum reinforcement for maximum tension control (T.C.)

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As min

Minimum area of flexural reinforcement.

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As

Area of steel reinforcement

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10 mm

Minimum stirrup size according to code.

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25 mm

CS2 = ____

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25 mm; dB; 4/3 d(aggregates)

CS1 = ____

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dB

25 mm; dB; 4/3 d(aggregates)

Which is the largest of the three clear spacings (1).

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ACI (American Concrete Institute)

Where did the philippines referenced their code?

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600[(d-c)/c]

fs = ____

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h

depth/height of the beam

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fs

tensile strength/stress of the Steel Reinforcement

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fc’

compressive strength/stress of the concrete

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steel cover

  • effective concrete cover

  • cc+øs