A rectangular reinforced concrete beam has a width of 300 mm and a effective depth of...

 

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A rectangular reinforced concrete beam has a width of 300 mm and a effective depth of 450 mm to centroid of the tension bars. The beam is reinforced with six 32 mmØ tension bars placed in two layers with outer layer having a depth of 478 mm, and two 28 mmØ compression bars with centroid 65 mm from the extreme concrete fiber. Use 2010 NSCP, fc' = 34.5 MPa and fy = 345 MPa. Assume that the concrete displaced by the compression steel shall not be neglected and that the compression steel yields. Det. the following: 1. The balanced steel ratio if the beam is highly reinforced. 2. The maximum steel ratio for a singly- reinforced section in tension control. 3. The maximum steel ratio for a doubly- reinforced section in tension control. A rectangular reinforced concrete beam has a width of 300 mm and a effective depth of 450 mm to centroid of the tension bars. The beam is reinforced with six 32 mmØ tension bars placed in two layers with outer layer having a depth of 478 mm, and two 28 mmØ compression bars with centroid 65 mm from the extreme concrete fiber. Use 2010 NSCP, fc' = 34.5 MPa and fy = 345 MPa. Assume that the concrete displaced by the compression steel shall not be neglected and that the compression steel yields. Det. the following: 1. The balanced steel ratio if the beam is highly reinforced. 2. The maximum steel ratio for a singly- reinforced section in tension control. 3. The maximum steel ratio for a doubly- reinforced section in tension control.

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SOLUTION 1 The balanced steel ratio if the beam is highly reinforced Given data Width of the beam b 300 mm Effective depth d 450 mm Number of tension bars n 6 Diameter of tension bars 32 mm Depth of o... View the full answer