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Structural Concrete - Hassoun

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876 Chapter 21 Beams Curved in Plan<br />

Figure 21.8 Circular beam subjected to a concentrated load at midspan, showing the<br />

bending moment diagram (BMD) and the torsional moment diagram (TMD).<br />

1. The moment at the centerline of the beam, section C, can be expressed as follows:<br />

where<br />

λ = EI/GJ<br />

K 1 = (2−2cosθ−sin 2 θ)<br />

K 2 = sin 2 θ<br />

K 3 = 2θ(λ + 1)−(λ−1) sin 2 θ<br />

M c = λ(2 − 2cosθ − sin2 θ)+sin 2 θ<br />

(Pr)<br />

2θ(λ + 1)−(λ − 1)sin 2θ<br />

M c = Pr<br />

K 3<br />

(λK 1 + K 2 ) (21.36)<br />

The torsional moment at the centerline is T c = 0.

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