Skeleton Structures: Especially in Their Application to the Building of Steel & Iron Bridges
Skeleton Structures: Especially in Their Application to the Building of Steel & Iron Bridges
O Olaus Henrici
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Wherever we might cut off the beam, the piece between the pier and the section will keep its position unaltered. In cut- ting the bridge for example in the centre, each half will form an arm of a girder, as* is shown in the swing bridge (Fig. 3, Plate I.). Similar girders are obtained by cutting the bridge anywhere, for it is easily seen that nowhere is a rod wanting, and that therefore the structure is perfectly rigid ; neither is there any superfluous rod as soon as the section is made. In co...nsidering, however, the whole structure, we find in reality two rods too many, as both ends, altogether four points, are fixed. Through this, how- ever, can in no case any special strain arise. If, for example, in the lower member, a bar should be a little too long, the strain produced would be distributed over the whole length of the member, and if this con- sist of 10 bars, each bar would be exposed to one- tenth of the strain. If, thus, a rod be too long by 1000th of its length, the strain would become very little,' and can be neglected.
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