Vector Mechanics for Engineers: Statics, 11th Edition
Vector Mechanics for Engineers: Statics, 11th Edition
11th Edition
ISBN: 9780077687304
Author: Ferdinand P. Beer, E. Russell Johnston Jr., David Mazurek
Publisher: McGraw-Hill Education
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Chapter 9.5, Problem 9.139P
To determine

Find the mass moment of inertia of the anchor with respect to each of the coordinate axes.

Expert Solution & Answer
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Answer to Problem 9.139P

The mass moment of inertia (Ix) of the anchor with respect to x axis is 344×10−6 lb⋅ft⋅s2_.

The mass moment of inertia (Iy) of the anchor with respect to y axis is 132.1×10−6 lb⋅ft⋅s2_.

The mass moment of inertia (Iz) of the anchor with respect to z axis is 453×10−6 lb⋅ft⋅s2_.

Explanation of Solution

Given information:

The thickness (t) of the anchor is 0.05 in.

The specific weight (γ) of the galvanized steel is 470 lb/ft3.

Assume the acceleration due to gravity (g) as 32.2 ft/s2

Calculation:

Show the section 1, section 2 and section 3 of the framing anchor as in Figure 1.

Vector Mechanics for Engineers: Statics, 11th Edition, Chapter 9.5, Problem 9.139P

Calculate the density (ρ) of the galvanized steel using the relation:

ρ=γg

Substitute 470 lb/ft3 for γ and 32.2 ft/s2 for g.

ρ=47032.2=14.596 lb⋅s2/ft4

Calculate the volume of the section 1 (V1) using the relation:

V1=A1t=3.5×2.25×t

Substitute 0.05 in. for t.

V1=3.5×2.25×0.05=0.39375 in.3×(1 ft12 in.)3=2.2786×10−4ft3

Calculate the volume of the section 2 (V2) as below:

V2=A2t=1×2.25×t

Substitute 0.05 in. for t.

V2=1×2.25×0.05=0.1125 in.3×(1 ft12 in.)3=6.5104×10−5ft3

Calculate the volume (V3) of the section 3 as below:

V3=A3t=12(3.5+1.25)×2×t

Substitute 0.05 in. for t.

V3=12×(3.5+1.25)×2×0.05=0.2375 in.3×(1 ft12 in.)3=1.3744×10−4ft3

Calculate the mass of section 1 (m1) using the relation:

m1=ρV1

Substitute 2.2786×10−4ft3 for V1 and 14.596 lb⋅s2/ft4 for ρ.

m1=14.596 ×2.2786×10−4=3325.845×10−6 lb⋅s2/ft

Calculate the mass of section 2 (m2) using the relation:

m2=ρV2

Substitute 6.5104×10−5ft3 for V2 and 14.596 lb⋅s2/ft4 for ρ.

m2=14.596 ×6.5104×10−5=950.26×10−6 lb⋅s2/ft

Calculate the mass of section 3 (m3) using the relation:

m3=ρV3

Substitute 1.3744×10−4ft3 for V3 and 14.596 lb⋅s2/ft4 for ρ.

m3=14.596 ×1.3744×10−4=2006.14×10−6 lb⋅s2/ft

Calculate the mass moment of inertia with respect to x axis for section 1 (Ix)1 as below:

(Ix)1=112(m1)(3.5)2+(m1×(3.52)2)

Substitute 3325.845×10−6 lb⋅s2/ft for m1.

(Ix)1=112(3325.845×10−6 lb⋅s2/ft)(3.5 in.×1 ft12 in.)2+(3325.845×10−6 lb⋅s2/ft×((3.5 in.)×1 ft12 in.2)2)=2.3577×10−5+7.073×10−5=9.4307 ×10−5 lb⋅ft⋅s2

Calculate the mass moment of inertia with respect to x axis for  section 2 (Ix)2 as below:

(Ix)2=112(m2)(1)2+(m2×(3.52+(12)2))

Substitute 950.26×10−6 lb⋅s2/ft for m2.

(Ix)2=112(950.26×10−6 lb⋅s2/ft)(1in.×1 ft12 in.)2+(950.26×10−6 lb⋅s2/ft× ((3.5 in.×1 ft12 in.)2+((1in.×1 ft12 in.)2)2))=5.4992×10−7+8.2488×10−5=83.037×10−6 lb⋅ft⋅s2

Calculate the mass moment of inertia with respect to x axis for section 3 (Ix)3 as below:

(Ix)3=118(m3)((3.5+1.25)2+22)+(m3×((23(3.5+1.25))2+(13×2)2))

Substitute 2006.14×10−6 lb⋅s2/ft for m3.

(Ix)3=118(2006.14×10−6 lb⋅s2/ft)(((3.5+1.25)in.×1 ft12 in.)2+(2in.×1 ft12 in.)2)+ +(2006.14×10−6 lb⋅s2/ft×((23((3.5+1.25)in.×1 ft12 in.))2+(13×2in.×1 ft12 in.)2))=2.0558×10−5+1.4589×10−4=166.452×10−6 lb⋅ft⋅s2

Calculate the mass moment of inertia with respect to x axis for anchor (Ix) using the parallel axis theorem as below:

Ix=(Ix)1+(Ix)2+(Ix)3

Substitute 9.4307 ×10−5 lb⋅ft⋅s2 for (Ix)1, 83.037×10−6 lb⋅ft⋅s2 for (Ix)2 and 166.452×10−6 lb⋅ft⋅s2 for (Ix)3.

Ix=9.4307 ×10−5 +83.037×10−6  +166.452×10−6=3.437×10−4 lb⋅ft⋅s2≈344×10−6 lb⋅ft⋅s2

Calculate the mass moment of inertia with respect to y axis for section 1 (Iy)1 as below:

(Iy)1=112m1(2.25)2+m1(2.252)2

Substitute 3325.845×10−6 lb⋅s2/ft for m1.

(Iy)1={112×3325.845×10−6 lb⋅s2/ft×(2.25 in.×1 ft12 in.)2 +3325.845×10−6 lb⋅s2/ft×((2.25in.×1 ft12 in.)2)2}=9.7436×10−6+2.923×10−5=38.975×10−6 lb⋅ft⋅s2

Calculate the mass moment of inertia with respect to y axis for section 2 (Iy)2 as below:

(Iy)2=112m2((2.25)2+(1)2)+m2[(2.252)2+(12)2]

Substitute 950.26×10−6 lb⋅s2/ft for m2.

(Iy)2={112(950.26×10−6 lb⋅s2/ft)((2.25in.×1 ft12 in.)2+(1in.×1 ft12 in.)2) +950.26×10−6 lb⋅s2/ft[((2.25in.×1 ft12 in.)2)2+(1in.×1 ft12 in.2)2]}=3.334×10−6+1.00017×10−5=13.336×10−6 lb⋅ft⋅s2

Calculate the mass moment of inertia with respect to y axis for section 3 (Iy)3 as below:

(Iy)3=118m3(2)2+m3[2.252+(132)2]

Substitute 2006.14×10−6 lb⋅s2/ft for m3.

(Iy)3={118×2006.14×10−6 lb⋅s2/ft(2in.×1 ft12 in.)2 +2006.14×10−6 lb⋅s2/ft[(2.25in.×1 ft12 in.)2+(13×(2in.×1 ft12 in.))2]}=3.096×10−6+7.672×10−5=79.816×10−6 lb⋅ft⋅s2

Calculate the mass moment of inertia with respect to y axis for anchor (Iy) using the parallel axis theorem as below:

Iy=(Iy)1+(Iy)2+(Iy)3

Substitute 38.975×10−6lb⋅ft⋅s2 for (Iy)1 13.336×10−6 lb⋅ft⋅s2 for (Iy)2 and 79.816×10−6lb⋅ft⋅s2 for (Iy)3.

Iy=38.975×10−6 +13.336×10−6+79.816×10−6=132.127×10−6 lb⋅ft⋅s2≈132.1×10−6 lb⋅ft⋅s2

Calculate the mass moment of inertia with respect to z axis for section 1 (Iz)1 as below:

(Iz)1=112m1[(2.25)2+(3.5)2]+m1[(2.252)2+(3.52)2]

Substitute 3325.845×10−6 lb⋅s2/ft for m1.

(Iz)1={1123325.845×10−6 lb⋅s2/ft[(2.25in.×1 ft12 in.)2+(3.5in.×1 ft12 in.)2] +3325.845×10−6 lb⋅s2/ft[(2.25in.×1 ft12 in.2)2+(3.5in.×1 ft12 in.2)2]}=3.332×10−5+9.996×10−5=133.283×10−6lb⋅ft⋅s2

Calculate the mass moment of inertia with respect to z axis for section 2 (Ix)2 as below:

(Iz)2=112m2(2.25)2+m2[(2.252)2+(3.5)2]

Substitute 950.26×10−6 lb⋅s2/ft for m2.

(Iz)2={112×950.26×10−6 lb⋅s2/ft×(2.25in.×1 ft12 in.)2 +950.26×10−6 lb⋅s2/ft×[(2.25in.×1 ft12 in.2)2+(3.5in.×1 ft12 in.)2]}=2.784×10−6+8.918×10−5=91.974×10−6 lb⋅ft⋅s2

Calculate the mass moment of inertia with respect to z axis for section 3 (Iy)3 as below:

(Iz)3=118m3(3.5+1.25)2+m3[(2.25)2+(23(3.5+1.25))2]

Substitute 2006.14×10−6 lb⋅s2/ft for m3.

(Iz)3={118×2006.14×10−6 lb⋅s2/ft((3.5+1.25)in.×1 ft12 in.)2 +2006.14×10−6 lb⋅s2/ft×[(2.25in.×1 ft12 in.)2+(23((3.5+1.25)in.×1 ft12 in.))2]}=1.746×10−6+2.102×10−4=227.694×10−6 lb⋅ft⋅s2

Calculate the mass moment of inertia with respect to z axis for anchor (Ix) using the parallel axis theorem as below:

Iz=(Iz)1+(Iz)2+(Iz)3

Substitute 133.283×10−6lb⋅ft⋅s2 for (Iz)1 91.974×10−6 lb⋅ft⋅s2 for (Iz)2 and 227.694×10−5 lb⋅ft⋅s2 for (Iz)3.

Iz=133.283×10−6+91.974×10−6 +2.27.694×10−6 =452.951×10−6 lb⋅ft⋅s2≈453×10−6 lb⋅ft⋅s2

Therefore, the mass moment of inertia (Ix) of the anchor with respect to x axis is 344×10−6 lb⋅ft⋅s2_.

Therefore, the mass moment of inertia (Iy) of the anchor with respect to y axis is 132.1×10−6 lb⋅ft⋅s2_.

Therefore, the mass moment of inertia (Iz) of the anchor with respect to z axis is 453×10−6 lb⋅ft⋅s2_.

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Chapter 9 Solutions

Vector Mechanics for Engineers: Statics, 11th Edition

Ch. 9.1 - 9.1 through 9.4 Determine by direct integration...Ch. 9.1 - 9.1 through 9.4 Determine by direct integration...Ch. 9.1 - 9.1 through 9.4 Determine by direct integration...Ch. 9.1 - 9.1 through 9.4 Determine by direct integration...Ch. 9.1 - 9.5 through 9.8 Determine by direct integration...Ch. 9.1 - 9.5 through 9.8 Determine by direct integration...Ch. 9.1 - Prob. 9.7PCh. 9.1 - Prob. 9.8PCh. 9.1 - 9.9 through 9.11 Determine by direct integration...Ch. 9.1 - Prob. 9.10P
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