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Author Archives: Anonymous

Alternate span loading is the common loading pattern for det…

Alternate span loading is the common loading pattern for determining maximum midspan positive moments due to live load.

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A beam has dimensions of b = 18 in., h = 24 in., and d = 21….

A beam has dimensions of b = 18 in., h = 24 in., and d = 21.5 in. and is reinforced with 4 No. 8 bars. The concrete strength is 5,800 psi, and the yield strength of the reinforcement is 60,000 psi. If the depth of the compressive stress block is a = 2.136579 in. and the strain in the reinforcement is εs = 0.019943, determine the strength φMn for this beam. Assume the transverse reinforcement is not spirals.

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A beam has dimensions of b = 16 in., h = 28 in., and d = 25….

A beam has dimensions of b = 16 in., h = 28 in., and d = 25.5 in. and is reinforced with 3 No. 8 bars. The concrete strength is 6,400 psi, and the yield strength of the reinforcement is 60,000 psi. Determine the strength Mn for this beam.

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A beam is singly reinforced with the reinforcement in two ro…

A beam is singly reinforced with the reinforcement in two rows. The bottom row contains 10 No. 6 bars at a depth of 22 in. The top row contains 7 No. 6 bars at a depth of 19 in. Determine the effective (centroidal) depth, d, of the steel.

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A beam is singly reinforced with the reinforcement in two ro…

A beam is singly reinforced with the reinforcement in two rows. The bottom row contains 10 No. 6 bars at a depth of 22 in. The top row contains 7 No. 6 bars at a depth of 19 in. Determine the effective (centroidal) depth, d, of the steel.

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Which symbol represents the assumed maximum useable compress…

Which symbol represents the assumed maximum useable compression strain in concrete?

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A simply supported beam with dimensions of b = 12 in., h = 2…

A simply supported beam with dimensions of b = 12 in., h = 28 in., d = 25.5 in., and L = 15 ft supports a uniform service (unfactored) dead load consisting of its own weight plus 1.8 kips/ft and a uniform service (unfactored) live load of 0.9 kips/ft. The concrete is normal-weight concrete. Determine the moment due to the factored loads, Mu.      

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Adjacent span loading is the common loading pattern for dete…

Adjacent span loading is the common loading pattern for determining maximum negative moments at supports due to live load.

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To delay buckling of compression steel in a beam, _______.

To delay buckling of compression steel in a beam, _______.

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A beam is singly reinforced with the reinforcement in two ro…

A beam is singly reinforced with the reinforcement in two rows. The bottom row contains 10 No. 7 bars at a depth of 16 in. The top row contains 8 No. 7 bars at a depth of 12.5 in. Determine the effective (centroidal) depth, d, of the steel.

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