e moduli and the ultimate stresses on the same graph of part (c), using the relation of the ACI Building Code (Equation 7

Structural Analysis
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Chapter2: Loads On Structures
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Using Figure 7.34, d. Plot the relationship between the moduli and the ultimate stresses on the same graph of part (c), using the relation of the ACI Building Code (Equation 7.3). e. Compare the two relations in questions c and d and comment on any discrepancies f. Determine the toughness at each water-cement ratio and comment on the effect of increasing water-cement ratio on the toughness of concrete.
8
Water-cement ratio = 0.33
50
0.40
40
0.50
30
20
0.67
2
10
1.00
1000
2000
3000
4000
5000
Strain, 10-6
FIGURE 7.34 Typical stress-strain relationships for
compressive tests on 0.15 × 0.30-m concrete cylinders at
an age of 28 days.
Stress, MPa
4.
CO
Stress, ksi
Transcribed Image Text:8 Water-cement ratio = 0.33 50 0.40 40 0.50 30 20 0.67 2 10 1.00 1000 2000 3000 4000 5000 Strain, 10-6 FIGURE 7.34 Typical stress-strain relationships for compressive tests on 0.15 × 0.30-m concrete cylinders at an age of 28 days. Stress, MPa 4. CO Stress, ksi
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