A reinforced concrete beam of rectangular section has a width of 300 mm and effective depth of 450 mm to the centroid of the tension reinforcements. The beam is reinforced for tension with 6 – 32 mm diameter bars placed in two layers with the outer bar layer having a depth of 478 mm to the centroid of the bar. The section is provided with 2- 28 mm diameter compression reinforcements having a total bar covering of 65 mm Use fe = 34.5 MPa and fy = 415 MPa. Neglect the concrete displaced by the compression reinforcements and assume that the compression steel yields. Ūse the 2010 NSCP. a) Calculate the balanced steel ratio if the beam is singly reinforced

A reinforced concrete beam of rectangular section has a width of 300 mm and effective depth of 450 mm to the centroid of the tension reinforcements. The beam is reinforced for tension with 6 – 32 mm diameter bars placed in two layers with the outer bar layer having a depth of 478 mm to the centroid of the bar. The section is provided with 2- 28 mm diameter compression reinforcements having a total bar covering of 65 mm Use fe = 34.5 MPa and fy = 415 MPa. Neglect the concrete displaced by the compression reinforcements and assume that the compression steel yields. Ūse the 2010 NSCP. a) Calculate the balanced steel ratio if the beam is singly reinforced

Steel Design (Activate Learning with these NEW titles from Engineering!)

6th Edition

ISBN:9781337094740

Author:Segui, William T.

Publisher:Segui, William T.

Chapter9: Composite Construction

Section: Chapter Questions

Problem 9.1.2P

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Concept explainers

Bars

In civil engineering, bars refer to steel reinforcement bars or rebars. These are structural members primarily used for reinforcement purposes in masonry works. A bar is characterized by its cross-sectional area, which is negligible compared to its length. Bars are usually manufactured by steel which is uniform throughout the length, or by meshing multiple steel wires. Other materials of the bar include carbon steel, glass fiber, carbon fiber, and basalt fiber. The reinforcing bars are coated with epoxy resins and other materials to enhance some of their properties including corrosion resistance.

Question

A reinforced concrete beam of rectangular section has a width of 300 mm and effective depth of 450
mm to the centroid of the tension reinforcements. The beam is reinforced for tension with 6 – 32 mm diameter
bars placed in two layers with the outer bar layer having a depth of 478 mm to the centroid of the bar. The
section is provided with 2 – 28 mm diameter compression reinforcements having a total bar covering of 65 mm
Use fc = 34.5 MPa and fy = 415 MPa. Neglect the concrete displaced by the compression reinforcements and
assume that the compression steel yields. Ūse the 2010 NSCP.
a) Calculate the balanced steel ratio if the beam is singly reinforced
b) Calculate the steel ratio of a singly-reinforced section in order that the extreme tension steel will reach a
strain of 0.005.
c) Find the number of pieces of 32 mm diameter tension reinforcements for a doubly-reinforced section if
reinforced with maximum tension steel for tension control.

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