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Structural Concrete - Hassoun

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1020 Appendix C <strong>Structural</strong> Aids<br />

Table C.1<br />

(Continued)<br />

19. Two unequal concentrated moving loads:<br />

( ) L − a<br />

R A max = V A max = P 1 + P 2<br />

L<br />

M max =(P 1 + P 2 ) x2<br />

L<br />

under load P 1 at x = 1 2<br />

M max = P 1 L<br />

4<br />

(<br />

L −<br />

P 2 a )<br />

P 1 + P 2<br />

at x = 0<br />

may occur with larger load at center of span and other load off span<br />

20. General rules for simple beams carrying moving concentrated<br />

loads V max occurs at one support and other loads on span (trial<br />

method). For M max : place centerline of beam midway between<br />

center of gravity of loads and nearest concentrated load. M max<br />

occurs under this load (here P 1 ).<br />

Table C.2<br />

Cantilever Beams<br />

21. Uniform load:<br />

W = total load = wL<br />

R A = V A = W<br />

M A = WL<br />

2<br />

M x = Wx2<br />

2L<br />

(at support A)<br />

Δ B max = WL3<br />

8EI<br />

Δ x =<br />

W<br />

24EIL (x4 − 4L 3 x + 3L 4 )<br />

(continued)

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