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Concrete Design 1

The document provides specifications and calculations for a series of reinforced concrete beam scenarios, including design moment strength, effective depth, shear strength, and required number of tension bars based on various parameters. It includes multiple choice questions for each calculation, detailing different configurations of tension and compression bars, concrete and steel strengths, and dimensions. The scenarios cover both singly and continuously reinforced beams with varying conditions and requirements.

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Rhodjane Dela Cruz
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163 views2 pages

Concrete Design 1

The document provides specifications and calculations for a series of reinforced concrete beam scenarios, including design moment strength, effective depth, shear strength, and required number of tension bars based on various parameters. It includes multiple choice questions for each calculation, detailing different configurations of tension and compression bars, concrete and steel strengths, and dimensions. The scenarios cover both singly and continuously reinforced beams with varying conditions and requirements.

Uploaded by

Rhodjane Dela Cruz
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Situation - Given the following data of a singly- reinforced

rectangular beam:
Beam width, b = 300 mm
Effective depth, d = 480 mm
Concrete strength, fc' = 34.5 MPa
Steel strength, fy = 415 MPa
Compute the design moment strength (kN-m) under the
following conditions:

1. Tension bars, As = 4 - 25 mm.


A. 318 C. 456 8. Calculate the effective depth (mm) of the section.
B. 353 D. 285 A. 420.5 C. 410
B. 417.5 D. 415
2. Tension bars, As = 6 - 25 mm.
A. 365 C. 501 9. Calculate the shear strength (kN) provided by the
B. 584 D. 451 concrete.
A. 122 C. 144
3. Tension bars, As = 8 - 25 mm. B. 133 D. 155
A. 423 C. 567
B. 473 D. 631 10. Calculate the shear strength (kN) provided by the shear
reinforcement. Ties are spaced @ 100 mm.
4. Tension bars, As = 8 - 28 mm. A. 185 C. 205
A. 736 C. 479 B. 180 D. 218
B. 662 D. 451
11. What is the maximum allowable tie spacing (mm)?
Situation - Given the following data of a rectangular beam: A. 340 C. 600
Beam dimension, b x h = 300 mm x 610 mm B. 450 D. 500
Bar diameters:
Tension bars = 25 mm 12. Calculate the nominal moment (kN-m) of the section.
Compression bars (if needed) = 20 mm A. 287 C. 312
Effective cover to centroid of bars: B. 342 D. 380
Tension steel = 90 mm
Compression steel = 60 mm 13. What is the minimum value of bw (mm) according to
Steel strength: Main bars = 415 MPa NSCP?
Ties = 275 MPa A. 291 C. 325
Concrete strength = 27.5 MPa B. 255 D. 300
Compute the required number of tension bars under the
following factored moments: Situation – Refer to the beam shown in the figure.
Given:
5. Mu = 150 kN-m. bw = 350 mm
A. 4 C. 3 t = 100 mm; a = 56 mm
B. 5 D. 2 As’ = 3 – 25 mm
As = 6 – 28 mm
6. Mu = 400 kN-m. Tie diameter = 12 mm
A. 5 C. 6 Clear concrete cover = 40 mm
B. 4 D. 3
Allowable shear stress, Fvc = 0.66 MPa
7. Mu = 650 kN-m. Concrete strength, fc’ = 21 MPa
A. 8 C. 9
B. 7 D. 10 Steel yield strength:
Longitudinal bars (fy) = 415 MPa
Situation – A continuous beam is reinforced as shown. Lateral bars (fyv) = 275 MPa
Given:
As = 8 – 20 mm
As’ = 4 –20 mm
ds = 10 mm
bw = 350 mm

t = 100 mm; h = 500 mm; a = 45


Clear concrete cover = 40 mm

Concrete strength (fc’) = 34 MPa


Longitudinal bars (fy) = 413 MPa
Lateral bars (fyv) = 275 MPa
14. Find the effective depth (mm) when h = 600 mm.
A. 515 C. 536
B. 508 D. 480

15. If the effective depth is 600 mm, compute the shear


strength (kN) provided by concrete.
A. 138.6 C. 449.6
B. 311.0 D. 337.2

16. If the effective depth is 600 mm, compute the shear


strength (kN) provided by shear reinforcement. Ties are
spaced @ 120 mm.
A. 138.6 C. 449.6
B. 311.0 D. 337.2

17. If the effective depth is 600 mm, compute the design shear
strength (kN) of the beam.
A. 138.6 C. 449.6
B. 311.0 D. 337.2

18. If the effective depth is 600 mm, compute the maximum


allowable tie spacing (mm).
A. 490 C. 600
B. 500 D. 580

19. If the effective depth is 600 mm, compute the nominal


moment (kN-m) of the section.
A. 727 C. 542
B. 808 D. 516

20. If the effective depth is 600 mm, compute the design


moment (kN-m) of the section.
A. 727 C. 542
B. 808 D. 525

21. Given:
Maximum size of coarse aggregates = 20 mm
Longitudinal bar = 28 mm
Lateral ties = 12 mm

Which of the following gives the minimum beam width, b, to


comply with the bar spacing requirements of the code?
A. 325 C. 291
B. 296 D. 300

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