AECT250-Lecture 5

# AECT250-Lecture 5 - Lecture 5 Beams Design for Shear...

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Lecture 5 - Page 1 of 9 Lecture 5 – Beams – Design for Shear & Deflection Steel beams are usually designed solely on the basis of moment. This means that bending stresses are the critical design factor. However, under certain circumstances, shear and deflection must also be checked. 1. Design for Shear Shear in steel beams generally does not control the design EXCEPT in the following two situations: Reduced beam cross-sectional area, as with “coped” beams Very heavy loads on short-span beam Short span Reduced Shear plane Normal beam Shear plane Coped beam Very heavy loads

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Lecture 5 - Page 2 of 9 Shear in steel beams is assumed to be carried entirely by the area of the web, A w : Design for shear is dictated in AISC Spec. G p. 16.1-64 as follows: LRFD Factored Design shear strength = φ v V n ASD Service Allowable shear strength = v n V where: φ v = 1.00 ( LRFD ) v = 1.50 ( ASD ) V n = nominal shear strength = 0.6F y A w C v A w = area of web (see sketch above) = t w d C v = Web shear coefficient = 1.0 for webs of rolled “ I ” – shaped shapes ( Conservative ) = see AISC Eq. G2-3, G2-4 and G2-5 p. 16.1-65 for other conditions d t w Beam X-Sect A w = Shear area in normal beam (shaded) A w = Shear area in coped beam (shaded)
Lecture 5 - Page 3 of 9 GIVEN : A W14x26 A992 steel beam.

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AECT250-Lecture 5 - Lecture 5 Beams Design for Shear...

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