Determine the flexural capacity, Mn for the singly reinforced rectangular beams

Question

Determine the flexural capacity, Mn for the singly reinforced rectangular beams having the following properties. Use strength reduction factors from ACI Code. Use beam 1 as a reference, identify the most effective way to increase the flexural capacity of a reinforced concrete beam and discuss

Problem #1: Determine the flexural capacity, pMn for the singly reinforced rectangular beams having the following properties. Use strength reduction factors from ACI Code. Use beam 1 as a reference, identify the most effective way to increase the flexural capacity of a reinforced concrete beam and discuss. Beam No. b in d in Bars f c (psi) fy si 4,000 22 60,000 12 3 No. 7 2 12 22 2 No. 9 plus 1 No. 8 4,000 60,000 4,000 80,000 3 No. 7 12 22 4 12 22 3 No. 7 6000 60,000 12 33 3 No. 7 4,000 60,000

Explanation / Answer

Column b d As Fy Fc a =(As x Fy )/(0.85 fc x b) Mn= 0.85x fc X ab(d-a/2) Mn = 0.75 x Mn 1 12 22 1.8 60 4 2.647 2233.059 1674.794118 2 12 22 2.79 60 4 4.103 3339.384 2504.537868 3 12 22 1.8 80 4 3.529 2913.882 2185.411765 4 12 22 1.8 60 6 1.765 2280.706 1710.529412 5 12 33 1.8 60 4 2.647 3421.059 2565.794118 Column b d As Fy Fc a =(As x Fy )/(0.85 fc x b) Mn= 0.85x fc X ab(d-a/2) Mn = 0.75 x Mn 1 12 22 1.8 60 4 2.647 2233.059 1674.794118 2 12 22 2.79 60 4 4.103 3339.384 2504.537868 3 12 22 1.8 80 4 3.529 2913.882 2185.411765 4 12 22 1.8 60 6 1.765 2280.706 1710.529412 5 12 33 1.8 60 4 2.647 3421.059 2565.794118 The best way to increase the flexular strength is to increase the depth of the beam

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