On Tubular Girder Bridges ...: With an Abstract of the Discussion Upon the Paper |
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Common terms and phrases
angle-irons applied ascertain ballast bottom plates breaking weight Britannia and Conway Britannia Bridge calculation Captain Simmons cast iron cells cellular top centre pier Civil Engineers Commissioners computed consideration considered construction continuous beam contrary flexure Conway Tubular Bridges deductions deflection depth dimensions Eaton Hodgkinson elastic forces equal equation Fairbairn feet span fibres formula Fowler given greatest compressive strain greatest load greatest strain Hodgkinson horizontal inch of section inch thick Inspecting Officers Iron Commission length lineal foot metal moment of inertia nearly neutral axis neutral line obtained opening opinion P₁ paper perfectly permanent load point of contrary practical proportion public traffic rails riveting rolling load SCOTT RUSSELL sectional area sideration square inch Stamford Street structure submit tensile strain tensile strength tion tons per square top and bottom top plate Torksey bridge tube TUBULAR GIRDER BRIDGES tubular-girder bridges ultimate strength velocity WILLIAM FAIRBAIRN wrought wrought-iron tubular girders
Popular passages
Page 50 - That, as it has been shown that, to resist the effects of reiterated flexure, iron should scarcely be allowed to suffer a deflection equal to one third of its ultimate deflection, and since the deflection produced by a given load is increased by the effects of percussion, it is advisable that the greatest load in railway bridges should in no case exceed one sixth of the weight which would break the beam when laid on at rest in the centre.
Page 12 - And in conclusion, considering that the attention of engineers has been sufficiently awakened to the necessity of providing a superabundant strength in railway structures, and also considering the great importance of leaving the genius of scientific men unfettered for the development of a subject as yet so novel and so rapidly progressive as the construction of railways, we are of opinion that any legislative enactments with respect to the forms and proportions of the iron structures employed therein...
Page 11 - A society for the general advancement of Mechanical Science, and more particularly for promoting the acquisition of that species of knowledge which constitutes the profession of a Civil Engineer, being the art of directing the great sources of power in Nature for the use and convenience of man...
Page 12 - for the purpose of inquiring into the conditions to be observed by engineers in the application of iron in structures exposed to violent concussions and vibration.
Page 52 - ... he had reexamined the tubes with reference to their workmanship, and found he was fully borne out in the expression of a want of confidence in it, as the riveting was certainly very imperfect, and the joints were not accurately, or very judiciously made, and the top of the girders was considerably out of line, both horizontally and vertically, therefore in his opinion the opening of the line would be attended with danger " by reason of the insufficiency of the work.
Page 11 - It was well known, that t for some time past there had been many attempts to restrict the free exercise of the talent and ingenuity of engineers, and to interfere with the progress of mechanical and constructive science, by the establishment of Government Boards and Commissions; almost, in fact, endeavouring to introduce a system analogous to that of the Ingenieurs des Fonts et Chaussees, which had proved so detrimental to all individual enterprise in France.
Page 56 - ACCIDENTS 101 possess ample strength, and all this in consequence of the attempt to introduce the system of centralisation and of Government supervision, which was found to be so pernicious in continental states, and the employment of officers who possessed undoubted skill for their own...
Page 26 - ... the deflection to the same amount as had, in the continuous beam, been produced by the weight representing 400 tons, and the proportion borne by the weight requisite to produce a given deflection in the detached beam, was to that requisite to produce the same deflection in the continuous beam as 65i to 120.
Page 7 - ... or more spans. This is no doubt correct to a certain extent and although the fact is admitted, yet this consideration is nevertheless purposely neglected, in these calculations; any auxiliary support of that kind acting merely as a counterpoise. It is considered safer to treat the subject on the principle of compassing each of the spans with simple and perfectly independent...
Page 8 - ... 29-25 34-13 4 7 65 390 31-69 36-97 5 0 70 420 34-13 39-81 5 5 75 450 36-56 42-67 5 9 80 480 39-00 45-50 6 2 85 510 41-44 48-34 6 7 90 540 43-88 51-19 6...