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Structural Concrete - Hassoun

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21.2 Uniformly Loaded Circular Beams 861<br />

Table 21.1<br />

Force Coefficients of Circular Beams<br />

Number of Supports, n<br />

θ = π n<br />

K 1<br />

K 2<br />

K 3<br />

α ∘ for T u<br />

(max)<br />

4 90 0.215 0.110 0.0330 19.25<br />

5 72 0.136 0.068 0.0176 15.25<br />

6 60 0.093 0.047 0.0094 12.75<br />

8 45 0.052 0.026 0.0040 9.50<br />

9 40 0.042 0.021 0.0029 8.50<br />

10 36 0.034 0.017 0.0019 7.50<br />

12 30 0.024 0.012 0.0012 6.25<br />

Negative moment at any support = K 1 w u r 2 (21.7)<br />

Positive moment at midspan = K 2 w u r 2 (21.8)<br />

Maximum torsional moment = K 3 w u r 2 (21.9)<br />

The variation of the shearing force and bending and torsional moments along a typical curved<br />

beam AB are shown in Fig. 21.2.<br />

Figure 21.2<br />

Forces in a circular beam.

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