An elevated jogging track is supported at intervals by a wood beam AB (L = 7.5 ft) that is pinned at A and supported by steel rod BC and a steel washer at B. Both the rod (d B C = 3/16 in.) and the washer (d B = 1.0 in.) were designed using a rod tension force of T B C =415 lb. The rod was sized using a factor of safely of 3 against reaching the ultimate stress tr u — 60 ksi. An allowable bearing stress s b a = 565 psi was used to size the washer at B. A small platform HF is suspended below a section of the elevated track to support some mechanical and electrical equipment. The equipment load is uniform load q = 50 lb/ft and concentrated load W E = 175 lb at mid-span of beam HF. The plan is to drill a hole through beam ABaX £land install the same rod (d B C ) and washer) d B ) at both D and F to support beam HF. (a) Use s and to check the proposed design for rod DF and washer d,: are they acceptable? (b) Re-check the normal tensile stress in rod BC and bearing stress at 8 if either is inadequate under the additional load from platform HF. Re-design them to meet the original design criteria.
An elevated jogging track is supported at intervals by a wood beam AB (L = 7.5 ft) that is pinned at A and supported by steel rod BC and a steel washer at B. Both the rod (d B C = 3/16 in.) and the washer (d B = 1.0 in.) were designed using a rod tension force of T B C =415 lb. The rod was sized using a factor of safely of 3 against reaching the ultimate stress tr u — 60 ksi. An allowable bearing stress s b a = 565 psi was used to size the washer at B. A small platform HF is suspended below a section of the elevated track to support some mechanical and electrical equipment. The equipment load is uniform load q = 50 lb/ft and concentrated load W E = 175 lb at mid-span of beam HF. The plan is to drill a hole through beam ABaX £land install the same rod (d B C ) and washer) d B ) at both D and F to support beam HF. (a) Use s and to check the proposed design for rod DF and washer d,: are they acceptable? (b) Re-check the normal tensile stress in rod BC and bearing stress at 8 if either is inadequate under the additional load from platform HF. Re-design them to meet the original design criteria.
Solution Summary: The author evaluates the proposed design for rod DF and washer F.
An elevated jogging track is supported at intervals by a wood beam AB (L = 7.5 ft) that is pinned at A and supported by steel rod BC and a steel washer at B. Both the rod (dBC= 3/16 in.) and the washer (dB= 1.0 in.) were designed using a rod tension force of TBC=415 lb. The rod was sized using a factor of safely of 3 against reaching the ultimate stress tru— 60 ksi. An allowable bearing stress sba= 565 psi was used to size the washer at B.
A small platform HF is suspended below a section of the elevated track to support some mechanical and electrical equipment. The equipment load is uniform load q = 50 lb/ft and concentrated load WE= 175 lb at mid-span of beam HF. The plan is to drill a hole through beam ABaX £land install the same rod (dBC) and washer) dB) at both D and F to support beam HF.
(a) Use s and to check the proposed design for rod DF and washer d,: are they acceptable?
(b) Re-check the normal tensile stress in rod BC and bearing stress at 8 if either is inadequate under the additional load from platform HF. Re-design them to meet the original design criteria.
Branch of science that deals with the stationary and moving bodies under the influence of forces.
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8 من 8
Mechanical vibration
HW-prob-1
lecture 8 By: Lecturer Mohammed O. attea
The 8-lb body is released from rest a distance xo
to the right of the equilibrium position.
Determine the displacement x as a function of time t,
where t = 0 is the time of release.
c=2.5 lb-sec/ft
wwwww
k-3 lb/in.
8 lb
Prob. -2
Find the value of (c) if the system is critically
damping.
Prob-3
Find Meq and Ceq at point B, Drive eq. of
motion for the system below.
Ш
H
-7~
+
目
T T & T
тт
+
Q For the following plan of building foundation, Determine
immediate settlement at points (A) and (B) knowing that: E,-25MPa,
u=0.3, Depth of foundation (D) =1m, Depth of layer below base level
of foundation (H)=10m.
3m
2m
100kPa
A
2m
150kPa
5m
200kPa
B
W
PE
2
43
R² 80 + 10 + kr³ Ø8=0 +0
R²+J+ kr200
R² + J-) + k r² = 0
kr20
kr20
8+
W₁ =
= 0
R²+1)
R²+J+)
4
lec 8.pdf
Mechanical vibration
lecture 6
By: Lecturer Mohammed C. Attea
HW1 (Energy method)
Find equation of motion and natural frequency for the system shown in fig. by energy
method.
m. Jo
000
HW2// For the system Fig below find
1-F.B.D
2Eq.of motion
8 wn
4-0 (1)
-5-
m
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