AECT480-Lecture%205 - Lecture 5 T- Beams Concrete beams are...

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Lecture 5 - Page 1 of 9 Lecture 5 – T- Beams Concrete beams are often poured integrally with the slab, forming a much stronger “T” – shaped beam. These beams are very efficient because the slab portion carries the compressive loads and the reinforcing bars placed at the bottom of the stem carry the tension. A T-beam typically has a narrower stem than an ordinary rectangular beam. These stems are typically spaced from 4’-0” apart to more than 12’-0”. The slab portion above the stem is designed as a one-way slab spanning between stems (see Lecture 6). A typical T-beam has the following dimensions and notations: b w b w d Overhang width Clear distance h f = Slab thickness b = Effective flange width NOTE : Stirrups in T-beam are required (not shown in this sketch)
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Lecture 5 - Page 2 of 9 Assuming T-beams are symmetrical , the following design dimensions are used: Overhang width = smaller b = smaller T-Beam Analysis T-beams are analyzed similarly to rectangular beams, except the compression area is a narrow “strip” usually located in the slab. h f a = Effective conc. compressive thickness 8h f or ½(Clear distance) ¼(Beam span) or (2 x overhang width) + b w b w Z = (d - 2 a ) b = Effective flange width d A c = Shaded area = Effective concrete compression area = (a)(b) A s = Total area of main tension bars
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Lecture 5 - Page 3 of 9 M u = Usable moment capacity of T-beam = φ TZ where: φ = 0.9 T = Tension force developed in main bars
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AECT480-Lecture%205 - Lecture 5 T- Beams Concrete beams are...

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