The weight of a single track railway bridge may be taken as equal to that of a double track highway bridge,--and the trusses that will be large enough for one will be large enough for the other.
When a double track is required, three trusses are usually employed, with a width for each roadway of 14 ft.
The theory of strains in bridge trusses is merely that of the Composition and Resolution of Forces.
It is interesting to note that it was indeed Bollman trusses to which the president of the railroad had referred.
Although its components were simple to fabricate and its analysis and design were straightforward, it was less economical of material than the more conventional panel trusses such as the Pratt and Whipple types.
By the use of timber trusses such crossings could be made in one or two spans with, at the most, one pier in the stream, thus avoiding the problem.
Bollman trusses on Valley of Virginia Branch will soon be memories.
Bollman trusses on feeder lines were continued in use until much later; a number of them on the Valley Railroad of Virginia (see fig.
This and succeeding Bollman trusses use iron towers.
Bollman deck trusseswere used in the approaches on both sides.
The pivot draw-span was formed of two Bollman deck trusses supported at their outer ends by hog chains.
Although no Bollman trusseswere built by Bollman or the B.
Two of these trusses with the span mentioned were capable of supporting a load of 30 tons, and they could be erected in a matter of hours over abutments prepared in advance or extemporized from the ruins of a demolished structure.
He suggested that trusses could not be made according to rule, but must be adapted to each individual case.
Whether in the highly improved varieties the departure of the central trusses from their proper type is due to reversion, I do not know.
This is so notorious a fact, that some florists regularly pinch off the central trusses of flowers.
He emphasized that trusses should not be made according to rule, but must be adapted to each individual, and he invented several forms of trusses himself.
The trusses of hay alone were trusted to for that purpose, which would be equally effectual, and less likely to awaken suspicion.
The vertical tie-bolts of the main trusses were all slack.
But we followed them, spying them from behind rocks all the way, and the cave having but one entrance they can be smoked to death with a few trusses of damp straw.
She threw herself down on some trusses of straw at the end of the barn, and the tears which had made her eyes smart so all day flowed freely.
Add 5 pounds of hay at night, makes 24 pounds to each horse in twenty-four hours; and it kept them much fatter than with double the corn each day unground, two trusses of hay a week.
Such trusseswere made for one purpose only, namely, to take great weight, and they were, as a consequence, so constructed as to provide strength.
But the most elaborate formations are those which were intended to providetrusses for buildings wherein the tie beams were dispensed with.
Now the prime object of nearly all the double-roofed trusses was to utilize the space between the rafters so as to give height and majesty to the interior.
In England, and on the Continent of Europe, are thousands of trusses structured to support the roofs, which are marvels of beauty.
The trusses to be hoisted were brought from the places where they had been put together, and placed across the main avenue at the points where they were to be fixed.
These trusses were the first that were fixed across the central avenue, and about 150 men were engaged in the hoisting of each one.
In the trusses forty-eight feet span there are, therefore, six such divisions in the length, and nine in those of seventy-two feet span.
The two heavier out of the four trusses just described weighed when completed eight tons each, and the other two, which are of rather lighter construction, six tons each.
The ornamental spandrils of the roof-trusses would be formed in stamped-work out of copper, and gilt.
In order to provide additional support for the great weight brought upon the last-mentioned trusses by the transept roof, extra columns were introduced underneath them.
It has been already mentioned that four of the roof-trusses vary from the rest on account of the greater load they have to sustain.
For raising the roof-trusses of seventy-two feet span over the main avenue a somewhat different method was employed.
The weight, when completed, of each of thetrusses of seventy-two feet span is about thirty-five cwt.
The animated scene presented by these operations was highly interesting from the number of men employed, both on the ground and for fixing the trusses in their position aloft, and from the rapid progress so many hands made.
Riveted trusses are preferable to articulated ones for rigidity.
If queen-post trusses are useless, some hundreds of thousands of hog-rods in freight cars could be dispensed with.
Along this line, it is a well-known fact that the bottom chords in queen-post trusses are useless, as far as resistance to tension is concerned.
The assembling of the trusses was accomplished as shown by Fig.
The method of molding was as follows: The trusses were made by cutting the chord rods to length and threading the web diagonals and verticals onto them.
Its framework consisted of 40 vertical trusses or radial frames 6 ft.
The process was a simple one, and by adopting a regular routine the men became so expert that two of them could complete many trusses in a working day.
For the main girders these rods were cut, bent and assembled into frames or trusses which were placed as units.
The girders were reinforced with three trusses made up of top and bottom chord rods connected by diagonal web rods; one truss was located at the center of the beam and one at each side.
The trusses are astoundingly large, and the individual blooms large and delicately beautiful, like small richly-modelled lilies of a tender, warm, white colour.
The number of shoots on each plant will vary according to the strength and vigor of the particular plant; but three or four will be quite enough, leaving about half a dozen trusses of fruit.
It would not be a bad idea for the trustees of other churches to have the trusses carefully examined.
They lift wheel to trusses and silently adjust bolts.
The attachment of the ends of the cables or chains at or near the first or shore piers to the longitudinal beams or trusses of stiffened suspension bridges, substantially as set forth.
I claim, 1st, The construction and arrangement of one or more yielding joints connecting the beams or trusses of stiffened suspension bridges, substantially as herein described.
There are four cables, one on each side of the two main trusses or stiffening girders.
Some timber bridges consist of queen-post trusses in the upright position, as shown diagrammatically in fig.
These timber framed structures served as models for the earlier metal trusses which began to be used soon after 1850, and which, except in a few localities where iron is costly, have quite superseded them.
Compound trusses consist of simple trusses used as primary, secondary and tertiary trusses, the secondary supported on the primary, and the tertiary on the secondary.
Intermediate piers support the trusses in the side spans.
In England timber bridges of considerable span, either braced trusses or laminated arches (i.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "trusses" in a variety of sentences. We hope that you will now be able to make sentences using this word.
