2. A rectangular beam has b = 18", h = 30", f'c = 5 ksi, fy = 80 ksi, Es = 29,000 ksi. Assume 3" from the bar centerline to the nearest concrete face. (a) Use hand calculations to find the area of steel needed to carry M₂ = 1550 ft-kips, using the smallest possible total area of steel and being sure that the section is tension-controlled (ACI 21.2). You will need both tension and compression steel. For this first calculation choose the area without regard to bar sizes, and assume a single layer of steel with d = 27”. (b) Choose suitable bars, an acceptable spacing, without bundling any bars. If you need two layers of tension steel, they should be placed at 3" c/c vertically, and you should adjust d accordingly and revise the area of steel if needed. (c) Show your results on a scale sketch of the cross-section.

2. A rectangular beam has b = 18", h = 30", f'c = 5 ksi, fy = 80 ksi, Es = 29,000 ksi. Assume 3" from the bar centerline to the nearest concrete face. (a) Use hand calculations to find the area of steel needed to carry M₂ = 1550 ft-kips, using the smallest possible total area of steel and being sure that the section is tension-controlled (ACI 21.2). You will need both tension and compression steel. For this first calculation choose the area without regard to bar sizes, and assume a single layer of steel with d = 27”. (b) Choose suitable bars, an acceptable spacing, without bundling any bars. If you need two layers of tension steel, they should be placed at 3" c/c vertically, and you should adjust d accordingly and revise the area of steel if needed. (c) Show your results on a scale sketch of the cross-section.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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