665
2–10. ,
2–11. a.
b.
c.
d.
e.
2–13. a.
b.
c.
2–14. a.
b.
c. Stable and statically indeterminate to the
second degree
2–15. a.
b. Stable and statically indeterminate to the
first degree
c.
2–17. a. Unstable
b. Stable and statically indeterminate to the
sixth degree
c. Stable and statically determinate
d. Unstable
2–18.
2–19.
2–21.
2–22.
2–23.
C
y
= 2.93 k
N
B
= 8.54 k
C
x
= 9.20 k
N
A
= 9.59 k
A
x
= 0
A
y
= 7.00 k
N
B
= 15.0 k
N
D
= 6.00 k
N
F
= 4.00 k
M
B
= 84 kN
#
m
B
y
= 30 kN
B
x
= 0
N
A
= 12 kN
A
y
= 5.00 k
A
x
= 95.3 k
F
B
= 110 k
A
x
= 10.0 kN
A
y
= 16.0 kN
B
y
= 48.0 kN
Unstable
Unstable
Stable and statically determinate
Unstable
Statically indeterminate to 1°
Statically indeterminate to 1°
Statically determinate
Unstable
Statically determinate
Statically determinate
Unstable
Indeterminate to 2 °
on FED force of 13.2 k
on BE 2.20 k/ft
Answers to Selected Problems
Chapter 1
1–1.
1–2.
1–3.
1–5.
1–6.
1–7.
1–9.
1–10.
1–11.
1–13.
1–14.
1–15.
1–17. Windward:
Leeward:
1–18.
1–19.
1–21.
1–22.
Chapter 2
2–1. ;
2–2.
,
2–3.
2–5. ,
2–6. ,
2–7. peak triangular
peak
triangular
2–9.
and E
y
= 12.9 k
on FED triangular loads, peaks 2.06 k/ft
on BE trapezoidal loading, peak 4.125 k/ft,
on ABCD with 2 forces of 736 lb, 184 lb/ft
on BG = 368 lb/ft
on ABCD 2 forces of 1725 lb
on BG = 230 lb/ft
on ABCDE 3 forces of 6.75 k
on BF = 0.675 k/ft
on EF, 0.9 k/ft; on ABCDE 3 forces of 13.5 k
with concentrated force of 26.7 kN at E.
on FED triangular loadings, peaks 10.7 kN/m
on BE trapezodial load, peak 21.4 kN/m
on FED, E
y
= 35.6 kNon BE = 14.2 kN/m
p
f
= 36 lb/ft
2
p
f
= 0.816 kN/m
2
F = 81.3 kN
p =-18.6 psf
p =-15.4 psf
p
20
= 21.8 psf
p
0-15
= 20.9 psf
p
30
= 31.1 psf
p
25
= 30.1 psf
p
20
= 29.1 psf
p
0-15
= 27.8 psf
L = 3.02 kN/m
2
L = 1.70 kN/m
2
F
s
= 94.5 k
Total dead load = 106 lb/ft
2
w = 240 lb/ft
6.20 kN/m
w = 468 lb/ft
F = 173 kN
w = 521 lb/ft
F = 24.6 k
F = 48.3 k