A uniform concrete slab of total weight W is to be attached, as shown in Fig. P-215, to two rods whose lower ends are on the same level. Determine the ratio of the areas of the rods so that the slab will remain level.

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Chapter2: Loads On Structures
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Differential Equation Solve the problem and solution.

SOLVE THE FOLLOWING PROBLEMS:
Problem 215
A uniform concrete slab of total weight W is to be attached, as shown in Fig. P-215, to two
rods whose lower ends are on the same level. Determine the ratio of the areas of the rods so
that the slab will remain level.
Figure P-215
L = 10 ft
Aluminum
E = 10 x 10° psi
L = 4 ft
Steel
E = 29 x 10 psi
L = 6 ft
L = 6 ft
Total Weight
W
%3D
3 ft
6 ft
1 ft
Figure P-216 and P-217
Problem 216
As shown in Fig. P-216, two aluminum rods AB and BC, hinged to rigid supports, are pinned
together at B to carry a vertical load P
0.60 in.2 and E = 10 × 106 psi, compute the elongation of each rod and the horizontal and
vertical displacements of point B. Assume a = 30° and 0 = 30°.
6000 lb. If each rod has a cross-sectional area of
B.
P.
Transcribed Image Text:SOLVE THE FOLLOWING PROBLEMS: Problem 215 A uniform concrete slab of total weight W is to be attached, as shown in Fig. P-215, to two rods whose lower ends are on the same level. Determine the ratio of the areas of the rods so that the slab will remain level. Figure P-215 L = 10 ft Aluminum E = 10 x 10° psi L = 4 ft Steel E = 29 x 10 psi L = 6 ft L = 6 ft Total Weight W %3D 3 ft 6 ft 1 ft Figure P-216 and P-217 Problem 216 As shown in Fig. P-216, two aluminum rods AB and BC, hinged to rigid supports, are pinned together at B to carry a vertical load P 0.60 in.2 and E = 10 × 106 psi, compute the elongation of each rod and the horizontal and vertical displacements of point B. Assume a = 30° and 0 = 30°. 6000 lb. If each rod has a cross-sectional area of B. P.
Problem 217
Solve Prob. 216 if rod AB is of steel, with E = 29 × 10° psi. Assume a = 45° and 0
other data remain unchanged.
= 30°; all
Problem 218
A uniform slender rod of length L and cross sectional area A is rotating in a horizontal plane
about a vertical axis through one end. If the unit mass of the rod is p, and it is rotating at a
constant angular velocity of w rad/sec, show that the total elongation of the rod is po² L°/3E.
Problem 219
A round bar of length L, which tapers uniformly from a diameter D at one end to a smaller
diameter d at the other, is suspended vertically from the large end. If w is the weight per unit
volume, find the elongation of the rod caused by its own weight. Use this result to determine
the elongation of a cone suspended from its base.
Transcribed Image Text:Problem 217 Solve Prob. 216 if rod AB is of steel, with E = 29 × 10° psi. Assume a = 45° and 0 other data remain unchanged. = 30°; all Problem 218 A uniform slender rod of length L and cross sectional area A is rotating in a horizontal plane about a vertical axis through one end. If the unit mass of the rod is p, and it is rotating at a constant angular velocity of w rad/sec, show that the total elongation of the rod is po² L°/3E. Problem 219 A round bar of length L, which tapers uniformly from a diameter D at one end to a smaller diameter d at the other, is suspended vertically from the large end. If w is the weight per unit volume, find the elongation of the rod caused by its own weight. Use this result to determine the elongation of a cone suspended from its base.
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