AECT250-Lecture 28

# AECT250-Lecture 28 - Lecture 28 Shear in Beams Heavy loads...

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Lecture 28 - Page 1 of 9 Lecture 28 – Shear in Beams Heavy loads on concrete beams produce diagonal shear cracks as shown below: Cracking in beams is normal and indicates the tension bars are actually working. Excessive cracking needs to be controlled by additional bars called stirrups placed perpendicular to the cracks as shown below: Shear cracks in areas of high shear Stirrup bars spanning crack Stirrup bar spacing, s Column (typ.)

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Lecture 28 - Page 2 of 9 Stirrups may take the shape of the following typical configurations: Design for Shear in Concrete Beams Vertical shear is carried by the concrete shear capacity and the shear capacity provided by the stirrups. In other words: V u (from shear diagram) < φ V c + φ V s where: V u = factored vertical shear determined at a distance “d” away from the face of support φ = 0.75 V c = shear strength of concrete = d b f w c ' 2 f’ c = concrete strength, PSI b w = width of beam V s = shear strength provided by stirrups bars = φ c u V V
Lecture 28 - Page 3 of 9 If V s < d b f w c

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## This note was uploaded on 05/05/2009 for the course AE AE250 taught by Professor Hultenius during the Fall '08 term at SUNY Delhi.

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AECT250-Lecture 28 - Lecture 28 Shear in Beams Heavy loads...

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