## Strength of Materials |

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Page 175

A rectangular beam b in. wide by h in. high carries a central concentrated load P

on a simply supported span of L ft. Express the maximum S, in terms of the

maximum St. . „ hSt Ans. S, = 24L 581. A laminated beam is composed of 5

planks, each 2 in. by 6 in., glued together to form a section 6 in. wide by 10 in.

high. If the allowable strength of the glue is 75 psi, what maximum flexure stress

may be developed when supporting a

span? 582.

A rectangular beam b in. wide by h in. high carries a central concentrated load P

on a simply supported span of L ft. Express the maximum S, in terms of the

maximum St. . „ hSt Ans. S, = 24L 581. A laminated beam is composed of 5

planks, each 2 in. by 6 in., glued together to form a section 6 in. wide by 10 in.

high. If the allowable strength of the glue is 75 psi, what maximum flexure stress

may be developed when supporting a

**uniformly distributed load**on a 12-ft simplespan? 582.

Page 201

6-14 is 9 ft long and supports a

6 ft of the span. At any section a-a between A and B, the moment effect defined by

M = (2Af ) l is caused only by Rt . Also, at any section 6-6 between B and C, the

moment effect will be due to R\ and to the portion of the

included between B and 6-6. Note that defining the bending moment in terms of

the forces to the left of the section means that the

no ...

6-14 is 9 ft long and supports a

**uniformly distributed load**of 30 lb/ft over the right6 ft of the span. At any section a-a between A and B, the moment effect defined by

M = (2Af ) l is caused only by Rt . Also, at any section 6-6 between B and C, the

moment effect will be due to R\ and to the portion of the

**uniformly distributed load**included between B and 6-6. Note that defining the bending moment in terms of

the forces to the left of the section means that the

**uniformly distributed load**hasno ...

Page 284

distributed load of w lb/ft over the middle span. Am. M2 = M3 = wL wL2 4 1 + 20 4

(1 + a)(a + 0) - 1 1 + 2a 4(1 + a) (a + 18) - 1 823. A continuous beam simply

supported over three 10-ft spans carries a concentrated load of 400 lb at the

center of the first span, a concentrated load of 640 lb at the center of the third

span, and a

the moments over the supports and check your answers using the results

obtained for Probs.

distributed load of w lb/ft over the middle span. Am. M2 = M3 = wL wL2 4 1 + 20 4

(1 + a)(a + 0) - 1 1 + 2a 4(1 + a) (a + 18) - 1 823. A continuous beam simply

supported over three 10-ft spans carries a concentrated load of 400 lb at the

center of the first span, a concentrated load of 640 lb at the center of the third

span, and a

**uniformly distributed load**of 80 lb/ft over the middle span. Solve forthe moments over the supports and check your answers using the results

obtained for Probs.

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