Materials Science And Engineering Properties
1st Edition
ISBN: 9781111988609
Author: Charles Gilmore
Publisher: Cengage Learning
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Chapter 11, Problem 11.4P
To determine
The length of internal cracks.
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A center point loading is used to test concrete for flexure. The sample is 150mm x 150mm and has a clear span of 600mm. The sample failed when the load applied is 100,000N. What is the flexure stress at failure in MPa?
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?
PART B
2.
(a) What is the criterion of failure of reinforced concrete flexural elements? What
distribution of compressive stress is normally assumed across the compression
zone of a reinforced concrete beam, and how does this compare to the actual stress
distribution?
(b) Obtain the ultimate moment of resistance of the beam section indicated in
Figure 2, if the grade of the concrete used in the section is 35N/mm?, and the
yield stress of the steel is 500N/m2
s)
750
6T20
350
ST25
6T25
200
Figure 2
Chapter 11 Solutions
Materials Science And Engineering Properties
Ch. 11 - Prob. 1CQCh. 11 - Prob. 2CQCh. 11 - Prob. 3CQCh. 11 - Prob. 4CQCh. 11 - Prob. 5CQCh. 11 - Prob. 6CQCh. 11 - Prob. 7CQCh. 11 - Prob. 8CQCh. 11 - Prob. 9CQCh. 11 - Prob. 10CQ
Ch. 11 - Prob. 11CQCh. 11 - Prob. 12CQCh. 11 - Prob. 13CQCh. 11 - Prob. 14CQCh. 11 - Prob. 15CQCh. 11 - Prob. 16CQCh. 11 - Prob. 17CQCh. 11 - Prob. 18CQCh. 11 - Prob. 19CQCh. 11 - Prob. 20CQCh. 11 - Prob. 21CQCh. 11 - Prob. 22CQCh. 11 - Prob. 23CQCh. 11 - Prob. 24CQCh. 11 - Prob. 25CQCh. 11 - Prob. 26CQCh. 11 - Prob. 27CQCh. 11 - Prob. 28CQCh. 11 - Prob. 29CQCh. 11 - Prob. 30CQCh. 11 - Prob. 1ETSQCh. 11 - Prob. 2ETSQCh. 11 - Prob. 3ETSQCh. 11 - Prob. 4ETSQCh. 11 - Prob. 5ETSQCh. 11 - Prob. 6ETSQCh. 11 - Prob. 7ETSQCh. 11 - Prob. 8ETSQCh. 11 - Prob. 9ETSQCh. 11 - Prob. 10ETSQCh. 11 - Prob. 11.1PCh. 11 - Prob. 11.2PCh. 11 - Prob. 11.3PCh. 11 - Prob. 11.4PCh. 11 - Prob. 11.5PCh. 11 - Prob. 11.6PCh. 11 - Prob. 11.7PCh. 11 - Prob. 11.8PCh. 11 - Prob. 11.9PCh. 11 - Prob. 11.10PCh. 11 - Prob. 11.11PCh. 11 - Prob. 11.12PCh. 11 - Prob. 11.13PCh. 11 - Prob. 11.14P
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- A 150mm x 300mm long cylindrical concrete specimen was tested for tensile strength. The sample failed when the applied force is 150,000N. What is the splitting tensile strength in MPa?arrow_forwardA 150mm diameter cylindrical concrete specimen was tested for compressive strength. What would be the maximum applied force in kN when the stress at failure is 41.4 MPa?arrow_forwardA concrete test cylinder is 150mm in diameter and 300mm in length. During an axial compression test the diameter increased by 0.1399 mm and the length decreased by 0.397 mm. The concrete has an ultimate compressive strength of 21Mpa, Ec=20,000Mpa. Compute the compressive load that caused the above deformationsarrow_forward
- what would be the average compressive strength of concrete if the load at failure of the 3 trials are 55,100 kg 54,800 kg and 55,200 kg. Diameter of the sample is 6" a. 31.1 MPa b. 30.6 MPa c. 31.6 MPa d. 30.1 MPaarrow_forwardWhen a specimen of M25 concrete is loaded to a stress level of 12.5 MPa, a strain of 500x10^-6 is recorded. If this load is allowed to stand for a long time, the strain increases to 1000 x 10^-6. In accordance with provisions of IS: 456-2000,considering the long-term effects, the effective modulus of elasticity of the concrete (in MPa) isarrow_forwardNO 1 Please solve and answer correctly, give the complete solutions.arrow_forward
- The percentage loss of pre-stress due to anchorage slip of 3 mm in a concrete beam of length of 30 m which is post-tensioned by a tendon subjected to an initial stress of 1200 N/ mm² and modulus of elasticity equal to 2.1 x 105 N/mm², isarrow_forwardTwo 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. Toughnessarrow_forwardIf the concrete in a column with fc = 6000 psi is subject to a long term load that causes sustained stress f. of 1500 psi, then after several years under load, calculate the final value of the creep strain. %3D Typical creep parameters Compressive Strength Specific Creep 6 psi MPa 10- per psi 10- per MPa Creep coefficient Cu 3,000 21 1.00 145 3.1 4,000 28 0.80 116 2.9 6,000 41 0.55 80 2.4 8,000 55 0.40 58 2.0 10,000 69 0.28 41 1.6 12,000 83 0.22 33 1.4 O a. 83*104 O b. 86*10-5 Oc. 86*10-4 O d. 83*10-5arrow_forward
- 8. During the compression test, the uniaxial strain in the concrete cylindrical specimen is 600 10. Assuming a Poisson's ratio equal to 0.20, compute the volumetric strain in the specimen.arrow_forwardA cylindrical block of concrete is 300mm long and has a circular cross section of 100mm in diameter. It carries a total compressive load of 67KN and under this load contract 0.2mm. Estimate the compressive stress and strain .arrow_forwardQI- A concrete cylindrical specimen 155 mm in diameter and 290 mm long is subjected to compressive loading up to failure. The following data shown in table below are obtained. Draw the stress- strain curve and determine: i) the concrete strength. ii) Initial Tangent Modulus. iii) Modulus of Elasticity. Iv) Secant Modulus at 90% of strength and v) State which type of stress strain behavior is this. Load, kN Deformation, mm×10* (Load - 8x16) (Deformation x 0.5x16) 222.5 103 413.1 206 635.2 324 730.4 378 856.1 432 953.6 486 1080.7 540 1171.2 756 1270.0 1025 1396.3 1395arrow_forward
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