## Strength of materials |

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Page 138

Then refer to Table B-7 on page 582 and select the most efficient (i.e., lightest)

section that can be used. Ans. h = 15.3 in. 509. A box section used in aircraft is

constructed of tubes connected by thin webs as shown in Fig. P-509. Each tube

has a cross-sectional area of 0.20 sq in. If the average stress in the tubes is not to

exceed 10,000 psi, determine the total uniformly distributed load that can be

supported on a simple span 12 ft long. Neglect the effect of the webs. 510.

Then refer to Table B-7 on page 582 and select the most efficient (i.e., lightest)

section that can be used. Ans. h = 15.3 in. 509. A box section used in aircraft is

constructed of tubes connected by thin webs as shown in Fig. P-509. Each tube

has a cross-sectional area of 0.20 sq in. If the average stress in the tubes is not to

exceed 10,000 psi, determine the total uniformly distributed load that can be

supported on a simple span 12 ft long. Neglect the effect of the webs. 510.

**Repeat Prob**.Page 139

beam AB, 6 in. wide by 10 in. deep and 10 ft long, is supported by a guy wire AC

in the position shown in Fig. P-515. The beam carries a load, including its weight,

of 500 lb for each foot of its length. Compute the maximum flexural stress at the

middle of the beam. Ans. S = 725 psi Fig. P-515 and P-516. 516.

515 if the 30° angle in Fig. P-515 is changed to 45°, all other data remaining the ...

**Repeat Prob**. 513 to find the maximum flexural stress at section b-b. 515. A timberbeam AB, 6 in. wide by 10 in. deep and 10 ft long, is supported by a guy wire AC

in the position shown in Fig. P-515. The beam carries a load, including its weight,

of 500 lb for each foot of its length. Compute the maximum flexural stress at the

middle of the beam. Ans. S = 725 psi Fig. P-515 and P-516. 516.

**Repeat Prob**.515 if the 30° angle in Fig. P-515 is changed to 45°, all other data remaining the ...

Page 416

Solve Prob. 1140 if the eccentric load is reduced to 20,000 lb. 1142. A steel

column 30 ft long has the section specified in Prob. 1124. It carries an axial load

of 100,000 lb. Using the AASHO formula with pinned ends and Eq. (11-21),

determine the maximum load placed 12 in. off center that can also be carried.

Ans. P = 45,600 lb 1143.

riveted ends and Eq. (11-22), with Sb = 20,000 psi. 1144. A 12-in. 30-lb channel

is used as a ...

Solve Prob. 1140 if the eccentric load is reduced to 20,000 lb. 1142. A steel

column 30 ft long has the section specified in Prob. 1124. It carries an axial load

of 100,000 lb. Using the AASHO formula with pinned ends and Eq. (11-21),

determine the maximum load placed 12 in. off center that can also be carried.

Ans. P = 45,600 lb 1143.

**Repeat Prob**. 1142, using the AASHO formula withriveted ends and Eq. (11-22), with Sb = 20,000 psi. 1144. A 12-in. 30-lb channel

is used as a ...

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allowable stresses aluminum angle assumed axes axial load beam in Fig beam loaded beam shown bending bolt cantilever beam caused centroid CN CN column compressive stress Compute the maximum concentrated load concrete cover plate cross section deformation Determine the maximum diameter elastic curve end moments equal equivalent Euler's formula factor of safety fibers flange flexure formula free-body diagram ft long ft-lb Hence hinged Hooke's law horizontal ILLUSTRATIVE PROBLEMS lb/ft length loaded as shown main plate maximum shearing stress maximum stress midspan midspan deflection modulus Mohr's circle moments of inertia neutral axis obtain plane plastic positive product of inertia proportional limit radius ratio reaction Repeat Prob resisting restrained beam resultant segment shaft shear center shear diagram shearing force shown in Fig Solution Solve Prob span static steel strain tensile stress thickness torque torsional uniformly distributed load vertical shear weld zero