AECT250-Lecture 24

AECT250-Lecture 24 - Lecture 24 Flexural Members(cont...

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Lecture 24 - Page 1 of 9 Lecture 24 – Flexural Members (cont.) Determining the usable moment capacity, M u , of a rectangular reinforced concrete beam is accomplished by using the formula below: (see Lect. 23) M u = 0.9A s f y d(1 - c y act f f ' 59 . 0 ρ ) Designing a beam using the equation above is much more difficult. Assuming the material properties and dimensions are known, the equation above still has 2 unknown variables – A s and ρ act . Therefore, design of steel reinforcement for a given beam is largely one of trial-and-error. Beam Design Design of concrete beam members is often one of trial-and-error. It’s difficult to directly solve for all the variables in a reinforced concrete beam. Usually, material properties are known as well as maximum applied factored moment, M max . The following Table is useful to get a “trial” beam size: Minimum Suggested Thickness “h” of Concrete Beams & One-Way Slabs End Conditions Member: Simply supported One end continuous Both ends continuous Cantilever Solid one-way slab L/20 L/24 L/28 L/10 Beam L/16 L/18.5 L/21 L/8 Span length L = inches Beams are usually rectangular having the width typically narrower than the height. The diagram below shows typical beam aspect ratios: h 1.5b 2.5b b

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AECT250-Lecture 24 - Lecture 24 Flexural Members(cont...

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