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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Textbook Question
Chapter 3, Problem 3.42QP
A drill rod with, a diameter of 1/2 in. is made of high-strength steel alloy with a shear modulus of 11.6 × 106 psi. The rod is to be subjected to a torque T. What is the minimum required length L of the rod so that the cross section at one end can be rotated 60° with respect to the other end without exceeding an allowable shear stress of 45 × 103 psi?
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2
A flexible circular area is subjected to a uniformly distributed load of 450 kN/m² (the figure below). The diameter of the load area is 2 m. Estimate the average stress increase (Aσay) below the center of the loaded
area between depths of 3 m and 6 m.
H₂
1.0
H₂
B
0.8
CHI HD DV
0.6
C
1.0
1.5
0.4
0.2
6.0
8.0.
10.0
2.0
2.5
3.0
4.0
5.0
H₁
(Enter your answer to two significant figures.)
Δσαν τ
kN/m²
6
Refer to the figure below. Using the procedure outlined in your textbook, determine the average stress increase in the clay layer below the center of the foundation due to the net foundation load of 45 tons. Use the
equations:
Aσ =
and
qo x B x L
(B+ z)(L+ z)
Aσ av (H2/H₁)
Δσι +44 + Δσο
net load
6
4:5 ft
10 ft
5ft x 5ft
Sand
Sand
y=100 lb/ft³
Ysat 122 lb/ft³:"
Ysat 120 lb/ft³:
0.7
C=0.25
Groundwater
table
C=0.06
Preconsolidation pressure = 2000 lb/ft²
(Enter your answer to three significant figures.)
Ασαν
=
lb/ft²
Refer to the figure below, which shows a flexible rectangular area. Given: B₁ = 4 ft, B₂ = 6 ft, L₁ = 8 ft, and L2 = 10 ft. If the area is subjected to a uniform load of 4100 lb/ft², determine the stress increase at a
depth of 10 ft located immediately below point O. Use the table below.
T
B(1)
3
B(2)
2
L(1)
*
4
L2)
Table 1 Variation of Influence Value I
n
m 0.8
0.9
1.0
1.2
1.4
0.1 0.02576 0.02698 0.02794 0.02926 0.03007
0.2 0.05042 0.05283 0.05471 0.05733 0.05894
0.3 0.07308 0.07661 0.07938 0.08323 0.08561
0.4 0.09314 0.09770 0.10129 0.10631 0.10941
0.5 0.11035 0.11584 0.12018 0.12626 0.13003
0.6 0.12474 0.13105 0.13605 0.14309 0.14749
0.7 0.13653 0.14356 0.14914 0.15703 0.16199
0.8 0.14607 0.15371 0.15978 0.16843 0.17389
0.9 0.15371 0.16185 0.16835 0.1766 0.18357
1.0 0.15978 0.16835 0.17522 0.18508 0.19139
1.1 0.16843 0.17766 0.18508 0.19584 0.20278
(Enter your answer to three significant figures.)
Aσ =
lb/ft²
Chapter 3 Solutions
Materials for Civil and Construction Engineers (4th Edition)
Ch. 3 - What is the chemical composition of steel? What is...Ch. 3 - Why does the ironcarbon phase diagram go only to...Ch. 3 - Draw a simple ironcarbon phase diagram showing the...Ch. 3 - What is the typical maximum percent of carbon in...Ch. 3 - Calculate the amounts and compositions of phases...Ch. 3 - Briefly discuss four heat treatment methods to...Ch. 3 - Define alloy steels. Explain why alloys are added...Ch. 3 - Prob. 3.8QPCh. 3 - Specifically state the shape and size of the...Ch. 3 - What are the typical uses of structural steel?
Ch. 3 - What is the range of thicknesses of cold-formed...Ch. 3 - Why is coil steel used for cold-formed steel...Ch. 3 - If a steel with a 33 ksi yield strength is used...Ch. 3 - Why is reinforcing steel used in concrete? Discuss...Ch. 3 - What is high-performance steel? State two HPS...Ch. 3 - Name three mechanical tests used to measure...Ch. 3 - The following laboratory tests are performed on...Ch. 3 - Sketch the stress-strain behavior of steel, and...Ch. 3 - Three steel bars with a diameter of 25 mm and...Ch. 3 - Three steel bars with a diameter of 0.5 in. and...Ch. 3 - Draw a typical stressstrain relationship for steel...Ch. 3 - Getting measurements from Figure 3.18, determine...Ch. 3 - A steel specimen is tested in tension. The...Ch. 3 - A steel specimen is tested in tension. The...Ch. 3 - A No. 10 steel rebar is tested in tension. By...Ch. 3 - A mild steel specimen originally 300 mm long is...Ch. 3 - A tension stress of 70 ksi was applied on a 12-in....Ch. 3 - A tensile stress is applied along the long axis of...Ch. 3 - A cylindrical steel alloy rod with a 0.5 in....Ch. 3 - A round steel alloy bar with a diameter of 0.75...Ch. 3 - A 19-mm reinforcing steel bar and a gauge length...Ch. 3 - Testing a round steel alloy bar with a diameter of...Ch. 3 - During the tension test on a steel rod within the...Ch. 3 - A grade 36 round steel bar with a diameter of 0.5...Ch. 3 - A high-yield-strength alloy steel bar with a...Ch. 3 - Estimate the cross-sectional area of a 350S125-27...Ch. 3 - An ASTM A615 grade 60 number 10 rebar with a gauge...Ch. 3 - A 32-mm rebar with a gauge length of 200 mm was...Ch. 3 - A steel pipe having a length of 3 ft. an outside...Ch. 3 - A steel pipe having a length of 1 m, an outside...Ch. 3 - A drill rod with a diameter of 10 mm is made of...Ch. 3 - A drill rod with, a diameter of 1/2 in. is made of...Ch. 3 - Prob. 3.43QPCh. 3 - An engineering technician performed a tension test...Ch. 3 - A Charpy V Notch (CVN) test was performed on a...Ch. 3 - Prob. 3.46QPCh. 3 - Prob. 3.47QPCh. 3 - How can the flaws in steel and welds be detected?...Ch. 3 - Determine the welding zone classification of A36...Ch. 3 - Briefly define steel corrosion. What are the four...Ch. 3 - Discuss the main methods used to protect steel...
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- Point loads of magnitude 100, 200, and 380 kN act at B, C, and D, respectively (in the figure below). Determine the increase in vertical stress at a depth of 6 m below point A. Use Boussinesq's equation. B 6 m A 6 m с 3 m D (Enter your answer to three significant figures.) Δαχτ kN/m²arrow_forwardTwo line loads q₁ = 30 kN/m and 92 = 44 kN/m of infinite lengths are acting on top of an elastic medium, as shown in the figure below. Find the vertical stress increase at A. 92 91 6 m 3 m 3 m Δσ A (Enter your answer to three significant figures.) Vertical stress increase at A = kN/m²arrow_forwardA flexible circular area is subjected to a uniformly distributed load of 144 kN/m² (see the figure below). The diameter of the load area is 2 m. Estimate the average stress increase (Aσay) below the center of the loaded area between depths of 3 m and 6 m. Use the equations: 1 Ασ = go 1 [1 + (2) ² ³/2 and Aσ av (H2/H1) Δσι + 41ση + Ασο 6 9 B/2 krark do Δε Aσ (Enter your answer to three significant figures.) Ασαν = kN/m²arrow_forward
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