Two 150 mm x 300 mm concrete cylinders with randomly oriented steel fiber contents of 0 and 2% by weight, respectively. After curing for 28 days, the specimens were subjected to increments of compressive loads until fail- ure. The load versus deformation results were as shown in Table P7.45. TABLE P7.45 Specimen no. 2 Fiber content (%) 2 Deformation (mm) Load (kN) 0.0305 507 507 0.0610 645 (failure) 681 0.0915 578 0.0915 396 1.525 338 (failure) Assuming that the gauge length is the whole specimen height, determine the following: a. The compressive stresses and strains for each specimen at each load increment. b. Plot stresses versus strains for the two specimens on one graph. c. The initial modulus of elasticity for each specimen. d. The ultimate strength for each specimen. e. The strain at failure for each specimen. f. Toughness. Curves may be approximated with a series of straight lines. g. Comment on the effect of adding fiber on the following: i. Modulus of elasticity ii. Ultimate strength iii. Ductility iv. Toughness

Two 150 mm x 300 mm concrete cylinders with randomly oriented steel fiber contents of 0 and 2% by weight, respectively. After curing for 28 days, the specimens were subjected to increments of compressive loads until fail- ure. The load versus deformation results were as shown in Table P7.45. TABLE P7.45 Specimen no. 2 Fiber content (%) 2 Deformation (mm) Load (kN) 0.0305 507 507 0.0610 645 (failure) 681 0.0915 578 0.0915 396 1.525 338 (failure) Assuming that the gauge length is the whole specimen height, determine the following: a. The compressive stresses and strains for each specimen at each load increment. b. Plot stresses versus strains for the two specimens on one graph. c. The initial modulus of elasticity for each specimen. d. The ultimate strength for each specimen. e. The strain at failure for each specimen. f. Toughness. Curves may be approximated with a series of straight lines. g. Comment on the effect of adding fiber on the following: i. Modulus of elasticity ii. Ultimate strength iii. Ductility iv. Toughness

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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! Three 150 mm x 300 mm concrete cylinders with randomly oriented steel fiber contents of 0, 2, and 3% by weight, respectively. After curing for 28 days, the specimens were subjected to increments of compressive loads until fail- ure. The load versus deformation results were as shown in Table P11.14. TABLE P11.14 Specimen No. Fiber Content (%) 1 2 3 2 Deformation (mm) Load (kN) 0.31 565 565 565 0.61 716 (failure) 756 792 0.91 641 756 1.22 440 690 1.52 378 641 1.83 351 (failure) 605 (failure) Assuming that the gauge length is the whole specimen height, determine the following: a. The compressive stresses and strains for each specimen at each load increment. b. Plot stresses versus strains for all specimens on one graph. c. The modulus of elasticity for each specimen. d. The ultimate strength for each specimen. e. The strain at failure for each specimen. f. Toughness. Curves may be approximated with a series of straight lines. g. Comment on the effects of increasing the fiber content on…
Two 150 mm * 300 mm concrete cylinders with randomly oriented steelfiber contents of 0 and 2% by weight, respectively. After curing for 28 days,the specimens were subjected to increments of compressive loads until failure. The load versus deformation results were as shown in Table P7.45. Assuming that the gauge length is the whole specimen height, determine the following:a. The compressive stresses and strains for each specimen at each loadincrement.b. Plot stresses versus strains for the two specimens on one graph.c. The initial modulus of elasticity for each specimen.d. The ultimate strength for each specimen.e. The strain at failure for each specimen.f. Toughness. Curves may be approximated with a series of straight lines.g. Comment on the effect of adding fiber on the following:i. Modulus of elasticityii. Ultimate strengthiii. Ductilityiv. Toughness
Three 150 mm * 300 mm concrete cylinders with water to cement ratios of0.4, 0.6, and 0.8, respectively. After curing for 28 days, the specimens weresubjected to increments of compressive loads until failure. The load versusdeformation results were as shown in Table P7.26. Assuming that the gauge length is the whole specimen height, it is required todo the following:a. The compressive stresses and strains for each specimen at each loadincrement.b. Plot stresses versus strains for all specimens on one graph.c. The ultimate strength for each specimen.d. The modulus of elasticity as the secant modulus at 40% of the ultimatestress for each specimen.e. The strain at failure for each specimen.f. The toughness for each specimen.g. Comment on the effect of increasing the water–cement ratio on thefollowing:i. Ultimate strengthii. Modulus of elasticityiii. Ductilityiv. Toughness. Curves may be approximated with a series of straight lines.
Problem 2: If f = 3 ksi what is the modulus of elasticity Ec and the maximum tensile stress fr that the concrete can carry before cracking (use ACI recommended equations). Assume a unit weight of the plain concrete is: a. Wc = 90- b. w lb lb 118- ft39 ft3) C. W = 160- Problem 3: Wight 3-6 Rugblom 4: Wight ? 7 lb ft3
2. In a ready-mix concrete plant, cylindrical samples are prepared and tested periodically to detect any mix problem and to ensure that the compressive strength is higher than the lower specification limit. The minimum target value was set at 5,000 psi. The following compressive strength data were collected. Sample No. 1 2 3 4 5 6 7 8 9 10 Compressive strength (psi) 5595 5139 6359 5192 5188 5241 5964 5875 6155 5115 Sample No. 11 12 13 14 15 16 17 18 19 20 Compressive strength (psi) 6695 5449 5278 6697 5195 6021 5320 5657 6595 5235 a. Calculate the mean, standard deviation, and the coefficient of variation of the data b. Using a spreadsheet program, create a control chart for these data showing the target value and the lower specification limit. Is the plant production meeting the specification requirement? If not, comment on possible reasons. Comment on the data scatter.
A concrete cylinder of diameter 150mm and length 300mm when subjected to an axial compressive load of 240KN resulted in an increase of diameter by 0.127mm and a decrease in length of 0.28mm.compute the values 1.poison ratio 2.modulus elasticity
The third-point loading flexure strength test was performed on a IVI ... concrete beam having a cross section of 0.15 m by 0.15 m and a span of 0.45 m. If the load at failure was 35.7 kN, calculate the flexure strength of the concrete. This normal-weight concrete has an average compressive strength of 20 MPa. What is the estimated flexure strength (hints: use the ACI equation)?
Three 150 mm × 300 mm concrete cylinders with water to cement ratios of 0.4, 0.6, and 0.8, respectively. After curing for 28 days, the specimens were subjected to increments of compressive loads until failure. The load versus deformation results were as shown in Table P7.26. TABLE P7.26 Specimen No. 1 3 w/c Ratio 0.4 0.6 0.8 Deformation (mm) Load (kN) 0.3 514 348 244 0.6 853 (failure) 472 304 0.9 433 (failure) 263 1.2 235 (failure) Assuming that the gauge length is the whole specimen height, it is required to do the following: a. The compressive stresses and strains for each specimen at each load increment. b. Plot stresses versus strains for all specimens on one graph. c. The ultimate strength for each specimen. d. The modulus of elasticity as the secant modulus at 40% of the ultimate stress for each specimen. e. The strain at failure for each specimen. f. The toughness for each specimen. g. Comment on the effect of increasing the water-cement ratio on the following: i. Ultimate…
Compressive Strength is conducted for each aggregate with 3 specimens for each no. of days of curing. The recorded maximum load when the specimen breaks are as follows 7 Days (kN) 14 Days (kN) 28 Days (kN) 746.3 754.7 486,73 678.8 3/8" Sample 513.14 694.2 360.71 679.8 759.8 7 Days (kN) 14 Days (kN) 28 Days (kN) 231.86 339.8 377.7 3/4" Sample 252.04 206.69 339.6 381.1 343.3 379.9 Compute the compressive strength, in psi, for each size of aggregate on each no. of days of curing. Please indicate if the sample passed the required strength for each no.of days of curing. Conversion: 1lb-f = 4.488 N Attach your solution on the box below, image type. Use the editor to format your answer
What is the stress in an 8-inch round x 16-inch high concrete cylinder (E = 2.5 x 10^6 psi) when the unit deformation is 0.0012 inch/inch? A. 500 psiB. 8100 psiC. 210 psiD. 3000 psi
Compressive Strength is conducted for each aggregate with 3 specimens for each no. of days of curing. The recorded maximum load when the specimen breaks are as follows 7 Days (kN) | 486.73 14 Days (kN) 28 Days (kN) 678.8 ... 746.3 3/8" Sample 513.14 694.2 754.7 360.71 679.8 759.8 7 Days (kN) 14 Days (kN) 28 Days (kN) 231.86 339.8 377.7 3/4" Sample 252.04 339.6 381.1 206.69 343.3 379.9 Compute the compressive strength, in psi, for each size of aggregate on each no. of days of curing. Please indicate if the sample passed the required strength for each no.of days of curing. Conversion: 1lb-f = 4.488 N Attach your solution on the box below, image type.
A concrete specimen with b = d is supported at both ends 600mm apart. It is tested for flexure strength with load at midspan of 100kN and failed with a flexural stress of 52.083 MPa. What is the dimension b and d of the specimen in mm?