Beam fixed, load evenly distributed, bears triple of [fig. 132].
Fig. 136
Beam fixed one end only, load on free end, bears a quarter of [fig. 132].
Fig. 137
Beam fixed one end only, load evenly distributed, bears half of [fig. 132].
To find the effective length of a beam supported at both ends when the position of the load is varied:
Rule.—Divide four times the product of the distances of the load from both supports by the whole span, in feet.
Example.—Find the effective length of a beam the supports of which are 6 feet apart, the load acting at a point 1 foot from its centre.