Materials for Civil and Construction Engineers (4th Edition)
4th Edition
ISBN: 9780134320533
Author: Michael S. Mamlouk, John P. Zaniewski
Publisher: PEARSON
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Chapter 8, Problem 8.8QP
To determine
The compressive strength of the concrete masonry.
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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
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?
4.1 Consider the prestressed concrete beam and prestressing steel stress-strain diagram given
below. The concrete is assumed to have an ultimate strain capacity of 0.003 in/in. Determine
the nominal strength of the member using the strain compatibility method. It should be noted
that the stress-strain diagram below allows virtually "exact" calculation of stresses and strains
in the prestressing steel.
Assume that the specified concrete strength is 4,000 psi, fse = 137 ksi, Ec = 3850 ksi,
Ecu = 0.003, p = 0.40 and Eps = 28,000 ksi.
20"
4"
3"
-10"
O
-10"
(a)
17.58"
Ap = 0.575 in.2
fp ksi
250
213
0.0079
Ep
(b)
0.067
Chapter 8 Solutions
Materials for Civil and Construction Engineers (4th Edition)
Ch. 8 - Prob. 8.1QPCh. 8 - Prob. 8.2QPCh. 8 - Prob. 8.3QPCh. 8 - Prob. 8.4QPCh. 8 - Prob. 8.5QPCh. 8 - Prob. 8.6QPCh. 8 - Prob. 8.7QPCh. 8 - Prob. 8.8QPCh. 8 - Prob. 8.9QPCh. 8 - Prob. 8.10QP
Ch. 8 - Prob. 8.11QPCh. 8 - A portion of a medium-weight concrete masonry unit...Ch. 8 - A portion of a concrete masonry unit was tested...Ch. 8 - A concrete masonry unit was tested according to...Ch. 8 - Prob. 8.15QPCh. 8 - Prob. 8.16QPCh. 8 - A severe weathering clay brick was tested for...Ch. 8 - Prob. 8.18QPCh. 8 - What is the grout? What is the grout used for?Ch. 8 - Prob. 8.20QP
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- SIT. B: Determine the tensile steel ratio of a given conditions if concrete strength f'. = 28 MPa and steel yield strength fy 4. if the tensile strain is Es = fy/Es upon crushing of concrete at a strain of 0.003. C. 0.02833 A. 0.01567 B. 0.02161 D. 0.02125 if the tensile strain is limited to 0.004 upon crushing of concrete at a strain of 0.003. A. 0.01567 B. 0.01548 5. 6. Minimum as required by NSCP 2015. C. 0.00313 D. 0.00405 A. 0.00333 B. 0.00276 = 420 MPa. C. 0.02778 D. 0.02064 uniformlyarrow_forwardAssuming concrete is uncracked. Compute the bending stress in the extreme fiber of the beam of figure for bending moment 1x10°kg cm . Determine the cracking moment of the section. A = 10cm² %3D E, = 2*10°kg / cm² E = 2*10°kg / cm² %3D %3D f'. =1836kg / cm² %3D 90 cm 100 cm 40 cmarrow_forwardA rectangular reinforced concrete beam has a width of 300 mm and an effective depth of 400 mm. Concrete strength is f’c = 28 MPa and steel yield strength is fy = 280 MPa. a. What is the distance of the neutral axis from the top of the beam so that the strain in the concrete 0.003 will be attained at the same time with the yield strain of steel? b. What is the total compressive force on concrete? c. What is the balanced steel ratio?arrow_forward
- 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 ft3arrow_forwardWhat 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 30.1 MPa c 30.6 MPa d 30.6 MPaarrow_forwardIn the computation of deflection, For all light weight concrete, the modification factor À is a. 0.80 b.0.75 c.0.90 d.0.85arrow_forward
- If 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_forwardIn order to estimate in-situ compressive strength, Rebound Hammer test is applied on a concrete shear wall. The following twelve Rebound numbers are measured. Estimate the compressive strength of the concrete in terms of cube strength. (Use the related charts provided at Rebound Numbers: 42 41 38 O a. 38 MPa O b. 36 MPa O c. 40 MPa O d. 456 kgf/cm² O e. 36 kgf/cm² 39 16 37 44 38 40 43 38 40arrow_forward21. The column of reinforced concrete is loaded with P = 8000 lbs. The modulus of elasticity (E) is 4.2E6 psi and the Poisson ratio is 0.15. 16in 16in What is the normal stress along section b-b? a. -15.625 psi b. -7.81 psi c. -2.60 psi d. -11.04 psiarrow_forward
- Using Figure 4, a cross-section of a concrete beam, answer the questions that follow.5.1. Calculate the moment of inertia about the X-axis and the Y-axis 5.2 Calculate the combined bending and direct stress at points A, B and C. All loading is assumed to compressive. revision paper 2020arrow_forwardPROBLEM TO SOLVE: 600 mm 400 mm Using fe' = 28 MPa, Mmax = +320 kNm Determine the following: a. Cracking Moment (kNm) 6-25mm diam. b. Compressive Stress felt by concrete (MPa) c. Tension Stress felt by the tension bars (MPa)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_forward
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